CN110146374A - The measuring method and device of brittleness index - Google Patents
The measuring method and device of brittleness index Download PDFInfo
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- CN110146374A CN110146374A CN201910156408.0A CN201910156408A CN110146374A CN 110146374 A CN110146374 A CN 110146374A CN 201910156408 A CN201910156408 A CN 201910156408A CN 110146374 A CN110146374 A CN 110146374A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0258—Non axial, i.e. the forces not being applied along an axis of symmetry of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The present invention provides the measuring method and device of a kind of brittleness index, this method comprises: obtaining the multiple groups experimental data of rock sample to be measured, wherein, each group of experimental data includes the strain parameter that stress parameters suffered by rock sample to be measured and rock sample to be measured generate under stress parameters；According to multiple groups experimental data, determine the first brittleness relevant parameter, the second brittleness relevant parameter and third brittleness relevant parameter, wherein, elastic strain energy of the first brittleness correlation parameter characterization rock sample to be measured in the peak last stage goes to absorb the degree of external force acting, the speed degree of second brittleness correlation parameter characterization rock sample to be measured energy dissipation in rupture process, dissipation degree of the third brittleness correlation parameter characterization rock sample to be measured in the elastic strain energy of post-peaking phase；According to the first brittleness relevant parameter, the second brittleness relevant parameter and third brittleness relevant parameter, the brittleness index of rock sample to be measured is determined.Reduce the complexity that brittleness index determines.
Description
Technical field
The present invention relates to rock mechanics technical field more particularly to the measuring methods and device of a kind of brittleness index.
Background technique
A kind of brittleness mechanical property intrinsic as rock, largely influences the compressibility and fracturing reform of reservoir
Complexity, therefore be of great significance for the evaluation of rock brittleness.
In the prior art, it is mainly then based on by carrying out triaxial compression test and acoustic emission experiment to rock sample to be measured
The stress-strain data that triaxial compression test obtains measure rock to be measured to the related acoustic emission parameters that acoustic emission experiment obtains jointly
The brittleness index of sample.
However in the prior art, it needs to carry out rock sample to be measured at least two experiments, be determined to increase brittleness index
Complexity.
Summary of the invention
The present invention provides the measuring method and device of a kind of brittleness index, reduces the complexity that brittleness index determines.
In a first aspect, the present invention provides a kind of measuring method of brittleness index, comprising:
Obtain the multiple groups experimental data of rock sample to be measured, wherein experimental data described in each group includes the rock to be measured
The strain parameter that stress parameters suffered by stone sample and the rock sample to be measured generate under the stress parameters；
According to the multiple groups experimental data, the first brittleness relevant parameter, the second brittleness relevant parameter and third brittleness are determined
Relevant parameter, wherein elastic strain energy of the rock sample to be measured described in the first brittleness correlation parameter characterization in the peak last stage
It goes to absorb the degree that external force is done work, rock sample energy in rupture process to be measured described in the second brittleness correlation parameter characterization
The speed degree of dissipation, elastic strain energy of the rock sample to be measured described in the third brittleness correlation parameter characterization in post-peaking phase
Dissipation degree；
According to the first brittleness relevant parameter, the second brittleness relevant parameter and the third brittleness relevant parameter,
Determine the brittleness index of the rock sample to be measured.
Further, according to the multiple groups experimental data, the first brittleness relevant parameter is determined, comprising:
According to the multiple groups experimental data, the elastic strain energy parameter of the rock sample to be measured is determinedFirst energy
Parameter Up, wherein the first energy parameter UpCharacterize the energy that the rock sample to be measured is absorbed in the peak last stage；
According to the elastic strain energy parameterWith the first energy parameter Up, determine the first brittleness relevant parameter
Further, according to the multiple groups experimental data, the second brittleness relevant parameter is determined, comprising:
According to the multiple groups experimental data, the elastic strain energy parameter of the rock sample to be measured is determinedIt is described to be measured
The residual strain energy parameter of rock sampleSecond energy parameter W, wherein the second energy parameter W characterization is described to be measured
Rock sample meets with stresses and the energy that is absorbed when confining pressure in collapse stage；
According to the elastic strain energy parameterThe residual strain energy parameterWith the second energy parameter W, really
Fixed second brittleness relevant parameter
Further, according to the multiple groups experimental data, third brittleness relevant parameter is determined, comprising:
According to the multiple groups experimental data, the elastic strain energy parameter of the rock sample to be measured is determinedIt is described to be measured
The residual strain energy parameter of rock sample
According to the elastic strain energy parameterWith the residual strain energy parameterDetermine third brittleness relevant parameter
Further, the strain parameter includes axial strain parameter and radial strain parameter；It is tested according to the multiple groups
Data determine the elastic strain energy parameter of the rock sample to be measuredInclude:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress
The curve of mapping relations between parameter and radial strain parameter, the second curve characterization stress parameters and axial strain parameter
Between mapping relations curve, include axial strain peak point in first curve；
By the corresponding stress parameters of the axial strain peak point, as peak stress σp；
It determines straight slope corresponding to the linear elasticity strain stage in first curve, and the straight slope is made
For elastic modulus E；
It determines the first strain point of at least one of the linear elasticity strain stage, determines each described first strain point
Corresponding axial strain parameter determines the second strain corresponding with the first strain point described in each in second curve
Point determines the corresponding radial strain parameter of each described second strain point, wherein each described first strain point with it is corresponding
The second strain point stress parameters having the same；
According to each axial strain parameter and each radial strain parameter, Poisson's ratio v is determined；
According to the peak stress σp, the elastic modulus E, the Poisson's ratio v and the rock sample to be measured bear
Confining pressure σc, determine the elastic strain energy parameter of the rock sample to be measured
Further, the strain parameter includes axial strain parameter and radial strain parameter；It is tested according to the multiple groups
Data determine the first energy parameter U of the rock sample to be measuredp, comprising:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress
The curve of mapping relations between parameter and radial strain parameter, the second curve characterization stress parameters and axial strain parameter
Between mapping relations curve, include axial strain peak point in first curve；
By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；
Third strain point corresponding with the axial strain peak point is determined in second curve, wherein the axis
To strain peak point and the third strain point stress parameters having the same；
By the corresponding radial strain parameter of the third strain point, as radial strain peak value εrp；
According to the axial strain peak value εap, the radial strain peak value εrp, stress parameters σaWith the rock to be measured
The confining pressure σ that stone sample is bornc, determine the first energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
Further, the strain parameter includes axial strain parameter and radial strain parameter；It is tested according to the multiple groups
Data determine the residual strain energy parameter of the rock sample to be measuredInclude:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress
The curve of mapping relations between parameter and radial strain parameter, the second curve characterization stress parameters and axial strain parameter
Between mapping relations curve, include overstrain point in first curve；
By the corresponding stress parameters of the overstrain point, as residual force σp；
It determines straight slope corresponding to the linear elasticity strain stage in first curve, and the straight slope is made
For elastic modulus E；
It determines the first strain point of at least one of the linear elasticity strain stage, determines each described first strain point
Corresponding axial strain parameter determines the second strain corresponding with the first strain point described in each in second curve
Point determines the corresponding radial strain parameter of each described second strain point, wherein each described first strain point with it is corresponding
The second strain point stress parameters having the same；
According to each axial strain parameter and each radial strain parameter, Poisson's ratio v is determined；
According to the residual stress σr, the elastic modulus E, the Poisson's ratio v and the rock sample to be measured bear
Confining pressure σc, determine the residual strain energy parameter of the rock sample to be measured
Further, the strain parameter includes axial strain parameter and radial strain parameter；It is tested according to the multiple groups
Data determine the second energy parameter W of the rock sample to be measured, comprising:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress
The curve of mapping relations between parameter and radial strain parameter, the second curve characterization stress parameters and axial strain parameter
Between mapping relations curve, include axial strain peak point and overstrain point in first curve；
By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；
Third strain point corresponding with the axial strain peak point is determined in second curve, wherein the axis
To strain peak point and the third strain point stress parameters having the same；
By the corresponding radial strain parameter of the third strain point, as radial strain peak value εrp；
By the corresponding axial strain parameter of the overstrain point, as axial strain residual value εar；
The 4th strain point corresponding with the overstrain point is determined in second curve, wherein the remnants are answered
Height and the 4th strain point stress parameters having the same；
By the corresponding radial strain parameter of the 4th strain point, as radial strain peak value εrp；
According to the axial strain peak value εap, the radial strain peak value εrp, the axial strain residual value
εar, the radial strain residual value εrrWith stress parameters σa, determine the second energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
Further, the brittleness index of the rock sample to be measured is equal to the first brittleness relevant parameter, second brittleness
The product of relevant parameter and the third brittleness relevant parameter.
Second aspect, the present invention provides a kind of measurement devices of brittleness index, comprising:
Acquiring unit, for obtaining the multiple groups experimental data of rock sample to be measured, wherein experimental data packet described in each group
Include the strain that stress parameters suffered by the rock sample to be measured and the rock sample to be measured generate under the stress parameters
Parameter；
First determination unit, for determining the first brittleness relevant parameter, the second brittlement phase according to the multiple groups experimental data
Close parameter and third brittleness relevant parameter, wherein rock sample to be measured described in the first brittleness correlation parameter characterization is before peak
The elastic strain energy in stage goes to absorb the degree of external force acting, rock sample to be measured described in the second brittleness correlation parameter characterization
The speed degree of energy dissipation in rupture process, rock sample to be measured described in the third brittleness correlation parameter characterization is behind peak
The dissipation degree of the elastic strain energy in stage；
Second determination unit, for according to the first brittleness relevant parameter, the second brittleness relevant parameter and described
Third brittleness relevant parameter determines the brittleness index of the rock sample to be measured.
Further, first determination unit is specifically used for determining the rock to be measured according to the multiple groups experimental data
The elastic strain energy parameter of stone sampleFirst energy parameter Up, wherein the first energy parameter UpCharacterize the rock to be measured
The energy that stone sample is absorbed in the peak last stage；According to the elastic strain energy parameterWith the first energy parameter Up, really
Fixed first brittleness relevant parameter
Further, first determination unit is specifically used for determining the rock to be measured according to the multiple groups experimental data
The elastic strain energy parameter of stone sampleThe residual strain energy parameter of the rock sample to be measuredSecond energy parameter W,
Wherein, the second energy parameter W characterizes the rock sample to be measured and meets with stresses in collapse stage and absorbed when confining pressure
Energy；According to the elastic strain energy parameterThe residual strain energy parameterWith the second energy parameter W, is determined
Two brittleness relevant parameters
Further, first determination unit is specifically used for determining the rock to be measured according to the multiple groups experimental data
The elastic strain energy parameter of stone sampleThe residual strain energy parameter of the rock sample to be measuredAccording to the elastic strain
It can parameterWith the residual strain energy parameterDetermine third brittleness relevant parameter
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes axial strain peak value in first curve
Point；By the corresponding stress parameters of the axial strain peak point, as peak stress σp；Determine the line bullet in first curve
Straight slope corresponding to the property strain stage, and using the straight slope as elastic modulus E；Determine the linear elasticity strain step
The first strain point of at least one of section determines the corresponding axial strain parameter of each described first strain point, described the
The second strain point corresponding with the first strain point described in each is determined in two curves, determines each described second strain point pair
The radial strain parameter answered, wherein each described first strain point is joined with corresponding second strain point stress having the same
Number；According to each axial strain parameter and each radial strain parameter, Poisson's ratio v is determined；It is answered according to the peak value
Power σp, the confining pressure σ that bears of the elastic modulus E, the Poisson's ratio v and the rock sample to be measuredc, determine the rock sample to be measured
Elastic strain energy parameter
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes axial strain peak value in first curve
Point；By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；In second curve
Middle determination third strain point corresponding with the axial strain peak point, wherein the axial strain peak point and the third
Strain point stress parameters having the same；By the corresponding radial strain parameter of the third strain point, as radial strain peak
Value εrp；According to the axial strain peak value εap, the radial strain peak value εrp, stress parameters σaWith the rock to be measured
The confining pressure σ that sample is bornc, determine the first energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes overstrain point in first curve；
By the corresponding stress parameters of the overstrain point, as residual force σp；Determine the linear elasticity strain step in first curve
Straight slope corresponding to section, and using the straight slope as elastic modulus E；It determines in the linear elasticity strain stage extremely
Few first strain point determines the corresponding axial strain parameter of each described first strain point, in second curve
It determines corresponding with the first strain point described in each the second strain point, determines the corresponding radial direction of each described second strain point
Strain parameter, wherein each described first strain point and corresponding second strain point stress parameters having the same；According to each
A axial strain parameter and each radial strain parameter, determine Poisson's ratio v；According to the residual stress σr, it is described
The confining pressure σ that elastic modulus E, the Poisson's ratio v and the rock sample to be measured are bornc, determine that the remnants of the rock sample to be measured are answered
Becoming can parameter
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes axial strain peak value in first curve
Point and overstrain point；By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；?
Third strain point corresponding with the axial strain peak point is determined in second curve, wherein the axial strain peak value
Point and the third strain point stress parameters having the same；By the corresponding radial strain parameter of the third strain point, as
Radial strain peak value εrp；By the corresponding axial strain parameter of the overstrain point, as axial strain residual value εar；
The 4th strain point corresponding with the overstrain point is determined in second curve, wherein the overstrain point and institute
State the 4th strain point stress parameters having the same；By the corresponding radial strain parameter of the 4th strain point, as radial direction
Strain peak value εrp；According to the axial strain peak value εap, the radial strain peak value εrp, the axial strain it is remaining
Value εar, the radial strain residual value εrrWith stress parameters σa, determine the second energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
Further, the brittleness index of the rock sample to be measured is equal to the first brittleness relevant parameter, second brittleness
The product of relevant parameter and the third brittleness relevant parameter.
The present invention provides a kind of measuring method of brittleness index and devices, real by the multiple groups for obtaining rock sample to be measured
Test data, wherein each group of experimental data, which includes stress parameters suffered by rock sample to be measured and rock sample to be measured, answers at this
The strain parameter generated under force parameter is then based on each stress parameters and strain parameter corresponding with each stress parameters,
It can determine that three parameters relevant to brittleness, be that the first brittleness relevant parameter, the second brittleness relevant parameter and third are crisp respectively
Property relevant parameter, wherein elastic strain energy of the first brittleness correlation parameter characterization rock sample to be measured in the peak last stage goes to absorb
The degree of external force acting, the speed journey of the second brittleness correlation parameter characterization rock sample to be measured energy dissipation in rupture process
Degree, dissipation degree of the third brittleness correlation parameter characterization rock sample to be measured in the elastic strain energy of post-peaking phase, last basis
These three determined parameter relevant to brittleness, can determine the brittleness index of rock sample to be measured.This programme is from energy
Dissipation angle establishes the indexs of three new evaluation rock brittleness, and these indexs can be based on stress parameters and strain
Parameter acquires, and is not related to parameter relevant to sound emission, it is therefore not necessary to acoustic emission experiment is carried out to rock sample to be measured, thus
Reduce the complexity of brittleness index measurement.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.
Fig. 1 is a kind of flow chart of the measuring method for brittleness index that the embodiment of the present invention one provides；
Fig. 2 is a kind of flow chart of the measuring method of brittleness index provided by Embodiment 2 of the present invention；
Fig. 3 is a kind of whole English teaching figure provided by Embodiment 2 of the present invention；
Fig. 4 is a kind of structural schematic diagram of the measurement device for brittleness index that the embodiment of the present invention three provides；
Fig. 5 is a kind of structural schematic diagram of the sensing equipment for brittleness index that the embodiment of the present invention five provides.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is a kind of flow chart of the measuring method for brittleness index that the embodiment of the present invention one provides, as shown in Figure 1, with
The method that the embodiment provides is applied to the measurement device of brittleness index to be illustrated, this method comprises:
Step 101: obtaining the multiple groups experimental data of rock sample to be measured, wherein each group of experimental data includes rock to be measured
The strain parameter that stress parameters suffered by stone sample and rock sample to be measured generate under stress parameters.
In practical application, the executing subject of the present embodiment can be the measurement device of brittleness index, the survey of the brittleness index
Determining device can be program software, or the medium of related computer program is stored with, for example, USB flash disk etc.；Alternatively, this is crisp
The measurement device of sex index can also be entity device that is integrated or being equipped with related computer program, for example, chip, intelligence are eventually
End, computer, server etc..
Wherein, multiple groups experimental data can carry out obtained by Rock Triaxial Compression Experiment rock sample to be measured under the conditions of confining pressure
It arrives.Rock Triaxial Compression Experiment is the prior art, herein no longer excessive description.
Step 102: according to multiple groups experimental data, determining the first brittleness relevant parameter, the second brittleness relevant parameter and third
Brittleness relevant parameter, wherein elastic strain energy of the first brittleness correlation parameter characterization rock sample to be measured in the peak last stage goes to inhale
Receive the degree of external force acting, the speed journey of the second brittleness correlation parameter characterization rock sample to be measured energy dissipation in rupture process
Degree, dissipation degree of the third brittleness correlation parameter characterization rock sample to be measured in the elastic strain energy of post-peaking phase.
In the present embodiment, the index of three new evaluation rock brittleness is established from energy dissipation angle in advance, and every
One index can be obtained based on each stress parameters and strain parameter corresponding with each stress parameters.
Specifically, multiple groups experimental data can be based on, whole English teaching is constituted, then according to whole English teaching
Peak stress, residual stress are read, and the basic rock mechanics parameters such as calculate elasticity modulus, Poisson's ratio, next according to reading
The related data and calculated related data taken, determines each index, wherein it is bent that elasticity modulus is equal to resultant stress-strain
The straight slope in line middle line elastic strain stage, Poisson's ratio are equal to linear elasticity and strain ratio of the stage central diameter to strain and axial strain
Value determination.
Step 103: according to the first brittleness relevant parameter, the second brittleness relevant parameter and third brittleness relevant parameter, determining
The brittleness index of rock sample to be measured.
In the present embodiment, a kind of preferred embodiment of brittleness index is determined are as follows: the brittleness index of rock sample to be measured is equal to first
The product of brittleness relevant parameter, the second brittleness relevant parameter and third brittleness relevant parameter, wherein the range of brittleness index can be
0 to 1, indicate rock sample to be measured from moulding to brittle degree.
The present invention provides a kind of measuring methods of brittleness index, and the multiple groups by obtaining rock sample to be measured test number
According to, wherein each group of experimental data includes that stress parameters suffered by rock sample to be measured and rock sample to be measured are joined in the stress
The strain parameter of several lower generations is then based on each stress parameters and strain parameter corresponding with each stress parameters, can be true
Three parameters relevant to brittleness are made, are the first brittleness relevant parameter, the second brittleness relevant parameter and third brittlement phase respectively
Close parameter, wherein elastic strain energy of the first brittleness correlation parameter characterization rock sample to be measured in the peak last stage goes to absorb external force
The degree of acting, the speed degree of second brittleness correlation parameter characterization rock sample to be measured energy dissipation in rupture process, the
Three brittleness correlation parameter characterization rock samples to be measured are in the dissipation degree of the elastic strain energy of post-peaking phase, and finally basis is determined
These three parameters relevant to brittleness, can determine the brittleness index of rock sample to be measured.This programme is from energy dissipation angle
The index for establishing three new evaluation rock brittleness is spent, and these indexs can be asked based on stress parameters and strain parameter
, it is not related to parameter relevant to sound emission, it is therefore not necessary to acoustic emission experiment be carried out to rock sample to be measured, to reduce
The complexity of brittleness index measurement.
Fig. 2 is a kind of flow chart of the measuring method of brittleness index provided by Embodiment 2 of the present invention, as shown in Fig. 2, should
Method may include:
Step 201: obtaining the multiple groups experimental data of rock sample to be measured, wherein each group of experimental data includes rock to be measured
The strain parameter that stress parameters suffered by stone sample and rock sample to be measured generate under stress parameters.
Step 202: according to multiple groups experimental data, determining elastic strain energy parameter, the rock-like to be measured of rock sample to be measured
The residual strain energy parameter of product, the first energy parameter, the second energy parameter, wherein the first energy parameter characterizes rock-like to be measured
The energy that product are absorbed in the peak last stage, the second energy parameter characterize rock sample to be measured and meet with stresses and confining pressure in collapse stage
When the energy that is absorbed.
Wherein, the elastic strain energy parameter of rock sample to be measured in order to obtainIt can comprise the further steps of:
First step determines the first curve and the second curve according to multiple groups experimental data, wherein the first curve characterization is answered
The curve of mapping relations between force parameter and radial strain parameter, the second curve characterize stress parameters and axial strain parameter it
Between mapping relations curve, include axial strain peak point in the first curve；
Second step, by the corresponding stress parameters of axial strain peak point, as peak stress σp；
Third step, determines straight slope corresponding to the linear elasticity strain stage in the first curve, and by straight slope
As elastic modulus E；
Four steps determines the first strain point of at least one of linear elasticity strain stage, determines each first strain
The corresponding axial strain parameter of point, determines the second strain point corresponding with each first strain point in the second curve, determines
The corresponding radial strain parameter of each second strain point, wherein each first strain point has with corresponding second strain point
There are identical stress parameters；
5th step determines Poisson's ratio v according to each axial strain parameter and each radial strain parameter；
6th step, according to peak stress σp, the confining pressure σ that bears of elastic modulus E, Poisson's ratio v and rock sample to be measuredc, really
The elastic strain energy parameter of fixed rock sample to be measured
Fig. 3 is whole English teaching figure provided by Embodiment 2 of the present invention, and in Fig. 3, the longitudinal axis is stress parameters σa
(unit is megapascal MPa), horizontal axis are that (on the basis of O point, right side is axial strain parameter to strain parameter, and left side is radial strain
Parameter), on the basis of the longitudinal axis, the curve of right part is the first curve, and the curve of left part is the second curve.It can by Fig. 3
To find out, in the first curve include the corresponding ordinate of axial strain peak point p, p point be peak stress σp。
To determine elastic modulus E, as seen from Figure 3, there are straightway, the straight lines in the curve between origin O and p point
The section corresponding stage is the linear elasticity stage, then the slope of the straightway is elastic modulus E.Specifically, can be in the straight line
Two points are randomly selected in section, the slope of the straightway is acquired according to the two points.
To determine Poisson's ratio v, at least one of linear elasticity stage in the first curve point can be randomly selected and be determined.
A kind of mode is when having chosen first strain point, then according to the first curve, to read the corresponding axial direction of the first strain point
Strain parameter, then finding from the linear elasticity strain stage in the second curve has identical stress parameters with first strain point
Second strain point reads the radial strain parameter of second strain point next according to the second curve, finally by the second strain point
Radial strain parameter and the ratio of axial strain parameter of the first strain point be determined as Poisson's ratio v.Another way are as follows: elected
When having taken multiple first strain points, based on the mode of above-mentioned the second strain point of determination, it is corresponding that each first strain point can be acquired
Poisson's ratio, the average value of all Poisson's ratios is then calculated, using the average value as Poisson's ratio v.In addition, right under the conditions of confining pressure
When rock sample to be measured carries out Rock Triaxial Compression Experiment, a fixed confining pressure can be set, then the confining pressure of the fixation is σc。
Wherein, the first energy parameter U of rock sample to be measured in order to obtainp, can comprise the further steps of:
First step determines the first curve and the second curve according to multiple groups experimental data, wherein the first curve characterization is answered
The curve of mapping relations between force parameter and radial strain parameter, the second curve characterize stress parameters and axial strain parameter it
Between mapping relations curve, include axial strain peak point in the first curve；
Second step, by the corresponding axial strain parameter of axial strain peak point, as axial strain peak value εap；
Third step determines third strain point corresponding with axial strain peak point in the second curve, wherein axial to answer
Become peak point and third strain point stress parameters having the same；
Four steps, by the corresponding radial strain parameter of third strain point, as radial strain peak value εrp；
5th step, according to axial strain peak value εap, radial strain peak value εrp, stress parameters σaWith rock-like to be measured
The confining pressure σ that product are bornc, determine the first energy parameter of rock sample to be measured εaFor axial strain parameter, εrFor radial strain parameter, εa、εrTo become
Amount.
In Fig. 3, the corresponding abscissa of axial strain peak point p is axial strain peak value εap, looked for from the second curve
To the third strain point with p point with identical stress parameters, then according to the second curve, the radial direction for reading the third strain point is answered
Variable element, and using the radial strain parameter as radial strain peak value εrp。
In order to simplify UpCalculating process, improve the determination efficiency of brittleness index, then to UpFurther abbreviation is carried out,Wherein, εvpFor volume
Peak value is strained, specifically, can be by εap、εrpIt is updated in existing calculation formula and acquires εvp。
Wherein, the residual strain energy parameter of rock sample to be measured in order to obtainIt can comprise the further steps of:
First step determines the first curve and the second curve according to multiple groups experimental data, wherein the first curve characterization is answered
The curve of mapping relations between force parameter and radial strain parameter, the second curve characterize stress parameters and axial strain parameter it
Between mapping relations curve, include overstrain point in the first curve；
Second step, by the corresponding stress parameters of overstrain point, as residual stress σp；
Third step, determines straight slope corresponding to the linear elasticity strain stage in the first curve, and by straight slope
As elastic modulus E；
Four steps determines the first strain point of at least one of linear elasticity strain stage, determines each first strain
The corresponding axial strain parameter of point, determines the second strain point corresponding with each first strain point in the second curve, determines
The corresponding radial strain parameter of each second strain point, wherein each first strain point has with corresponding second strain point
There are identical stress parameters；
5th step determines Poisson's ratio v according to each axial strain parameter and each radial strain parameter；
6th step, according to residual stress σr, the confining pressure σ that bears of elastic modulus E, Poisson's ratio v and rock sample to be measuredc, really
The residual strain energy parameter of fixed rock sample to be measured
It as seen from Figure 3, is residual stress including the corresponding ordinate of overstrain point e, e point in the first curve
σp。
Wherein, the second energy parameter W of rock sample to be measured in order to obtain, can comprise the further steps of:
First step determines the first curve and the second curve according to multiple groups experimental data, wherein the first curve characterization is answered
The curve of mapping relations between force parameter and radial strain parameter, the second curve characterize stress parameters and axial strain parameter it
Between mapping relations curve, include axial strain peak point and overstrain point in the first curve；
Second step, by the corresponding axial strain parameter of axial strain peak point, as axial strain peak value εap；
Third step determines third strain point corresponding with axial strain peak point in the second curve, wherein axial to answer
Become peak point and third strain point stress parameters having the same；By the corresponding radial strain parameter of third strain point, as diameter
To strain peak value εrp；
Four steps, by the corresponding axial strain parameter of overstrain point, as axial strain residual value εar；Second
The 4th strain point corresponding with overstrain point is determined in curve, wherein overstrain point and the 4th strain point are having the same
Stress parameters；
5th step, by the corresponding radial strain parameter of the 4th strain point, as radial strain peak value εrp；
6th step, according to axial strain peak value εap, radial strain peak value εrp, axial strain residual value εar, diameter
To strain residual value εrrWith stress parameters σa, determine the second energy parameter of rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
In Fig. 3, the corresponding abscissa of overstrain point e is axial strain residual value εar, found from the second curve
There is the 4th strain point (the 4th strain point is the overstrain point in the second curve) of identical stress parameters with e point, then
According to the second curve, the radial strain parameter of the 4th strain point is read, and using the radial strain parameter as radial strain
Residual value εrr。
In order to simplify the calculating process of W, the determination efficiency of brittleness index is further increased, then abbreviation is carried out to W, εvrIt is remaining for the strain of volume
Value, specifically, can be by εar、εrrIt is updated in existing calculation formula and acquires εvr。
Step 203: according to elastic strain energy parameter and the first energy parameter, determining the first brittleness relevant parameter.
In the present embodiment, the first brittleness relevant parameter
Step 204: according to elastic strain energy parameter, residual strain energy parameter and the second energy parameter, determining the second brittleness
Relevant parameter.
In the present embodiment, the second brittleness relevant parameter
Step 205: according to elastic strain energy parameter and residual strain energy parameter, determining third brittleness relevant parameter.
In the present embodiment, third brittleness relevant parameter
Step 206: according to the first brittleness relevant parameter, the second brittleness relevant parameter and third brittleness relevant parameter, determining
The brittleness index of rock sample to be measured.
In the present embodiment, the brittleness index B=B of rock sample to be measured1B2B3。
The embodiment of the present invention obtains whole English teaching by analyzing Rock Triaxial Compression Experiment, is determined based on curve
Three new indexs, to carry out brittleness index evaluation based on three new indexs.Data needed for this programme are less, and can be straight
It connects, accurately evaluate rock brittleness, so as to establish solid foundation for Field design.
Fig. 4 is a kind of structural schematic diagram of the measurement device for brittleness index that the embodiment of the present invention three provides, comprising:
Acquiring unit 401, for obtaining the multiple groups experimental data of rock sample to be measured, wherein test number described in each group
According to what is generated under the stress parameters including stress parameters suffered by the rock sample to be measured and the rock sample to be measured
Strain parameter；
First determination unit 402, for according to the multiple groups experimental data, determining the first brittleness relevant parameter, second crisp
Property relevant parameter and third brittleness relevant parameter, wherein rock sample to be measured described in the first brittleness correlation parameter characterization exists
The elastic strain energy of peak last stage goes to absorb the degree of external force acting, rock to be measured described in the second brittleness correlation parameter characterization
The speed degree of sample energy dissipation in rupture process, rock sample to be measured described in the third brittleness correlation parameter characterization exist
The dissipation degree of the elastic strain energy of post-peaking phase；
Second determination unit 403, for according to the first brittleness relevant parameter, the second brittleness relevant parameter and institute
Third brittleness relevant parameter is stated, determines the brittleness index of the rock sample to be measured.
In the present embodiment, the crisp of the offer of the embodiment of the present invention one can be performed in the measurement device of the brittleness index of the present embodiment
The measuring method of sex index, realization principle is similar, and details are not described herein again.
For the embodiment of the present invention by the multiple groups experimental data of acquisition rock sample to be measured, each group of experimental data includes to be measured
The strain parameter that stress parameters suffered by rock sample and rock sample to be measured generate under the stress parameters, is then based on each
Stress parameters and strain parameter corresponding with each stress parameters, it may be determined that go out three parameters relevant to brittleness, be respectively
First brittleness relevant parameter, the second brittleness relevant parameter and third brittleness relevant parameter, wherein the first brittleness correlation parameter characterization
Elastic strain energy of the rock sample to be measured in the peak last stage goes to absorb the degree of external force acting, and the second brittleness correlation parameter characterization waits for
The speed degree of rock sample energy dissipation in rupture process is surveyed, third brittleness correlation parameter characterization rock sample to be measured is at peak
The dissipation degree of the elastic strain energy in stage afterwards, it is last according to these three parameters relevant to brittleness determined, it can determine
The brittleness index of rock sample to be measured out.This programme establishes the finger of three new evaluation rock brittleness from energy dissipation angle
Mark, and these indexs can be acquired based on stress parameters and strain parameter, not be related to parameter relevant to sound emission, therefore,
Without carrying out acoustic emission experiment to rock sample to be measured, to reduce the complexity of brittleness index measurement.
The embodiment of the present invention four provides a kind of structural schematic diagram of the measurement device of brittleness index, in the base of embodiment three
On plinth,
First determination unit is specifically used for determining the rock sample to be measured according to the multiple groups experimental data
Elastic strain energy parameterFirst energy parameter Up, wherein the first energy parameter UpThe rock sample to be measured is characterized to exist
The energy that the peak last stage is absorbed；According to the elastic strain energy parameterWith the first energy parameter Up, determine that first is crisp
Property relevant parameter
Further, first determination unit is specifically used for determining the rock to be measured according to the multiple groups experimental data
The elastic strain energy parameter of stone sampleThe residual strain energy parameter of the rock sample to be measuredSecond energy parameter W,
In, the second energy parameter W characterizes the rock sample to be measured and meets with stresses and the energy that is absorbed when confining pressure in collapse stage
Amount；According to the elastic strain energy parameterThe residual strain energy parameterWith the second energy parameter W, second is determined
Brittleness relevant parameter
Further, first determination unit is specifically used for determining the rock to be measured according to the multiple groups experimental data
The elastic strain energy parameter of stone sampleThe residual strain energy parameter of the rock sample to be measuredAccording to the elastic strain
It can parameterWith the residual strain energy parameterDetermine third brittleness relevant parameter
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes axial strain peak value in first curve
Point；By the corresponding stress parameters of the axial strain peak point, as peak stress σp；Determine the line bullet in first curve
Straight slope corresponding to the property strain stage, and using the straight slope as elastic modulus E；Determine the linear elasticity strain step
The first strain point of at least one of section determines the corresponding axial strain parameter of each described first strain point, described the
The second strain point corresponding with the first strain point described in each is determined in two curves, determines each described second strain point pair
The radial strain parameter answered, wherein each described first strain point is joined with corresponding second strain point stress having the same
Number；According to each axial strain parameter and each radial strain parameter, Poisson's ratio v is determined；It is answered according to the peak value
Power σp, the confining pressure σ that bears of the elastic modulus E, the Poisson's ratio v and the rock sample to be measuredc, determine the rock sample to be measured
Elastic strain energy parameter
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes axial strain peak value in first curve
Point；By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；In second curve
Middle determination third strain point corresponding with the axial strain peak point, wherein the axial strain peak point and the third
Strain point stress parameters having the same；By the corresponding radial strain parameter of the third strain point, as radial strain peak
Value εrp；According to the axial strain peak value εap, the radial strain peak value εrp, stress parameters σaWith the rock to be measured
The confining pressure σ that sample is bornc, determine the first energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes overstrain point in first curve；
By the corresponding stress parameters of the overstrain point, as residual force σp；Determine the linear elasticity strain step in first curve
Straight slope corresponding to section, and using the straight slope as elastic modulus E；It determines in the linear elasticity strain stage extremely
Few first strain point determines the corresponding axial strain parameter of each described first strain point, in second curve
It determines corresponding with the first strain point described in each the second strain point, determines the corresponding radial direction of each described second strain point
Strain parameter, wherein each described first strain point and corresponding second strain point stress parameters having the same；According to each
A axial strain parameter and each radial strain parameter, determine Poisson's ratio v；According to the residual stress σr, it is described
The confining pressure σ that elastic modulus E, the Poisson's ratio v and the rock sample to be measured are bornc, determine that the remnants of the rock sample to be measured are answered
Becoming can parameter
Further, the strain parameter includes axial strain parameter and radial strain parameter；
First determination unit is specifically used for determining the first curve and the second curve according to the multiple groups experimental data,
Wherein, the curve of the mapping relations between the first curve characterization stress parameters and radial strain parameter, second curve
The curve of the mapping relations between stress parameters and axial strain parameter is characterized, includes axial strain peak value in first curve
Point and overstrain point；By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；?
Third strain point corresponding with the axial strain peak point is determined in second curve, wherein the axial strain peak value
Point and the third strain point stress parameters having the same；By the corresponding radial strain parameter of the third strain point, as
Radial strain peak value εrp；By the corresponding axial strain parameter of the overstrain point, as axial strain residual value εar；
The 4th strain point corresponding with the overstrain point is determined in second curve, wherein the overstrain point and institute
State the 4th strain point stress parameters having the same；By the corresponding radial strain parameter of the 4th strain point, as radial direction
Strain peak value εrp；According to the axial strain peak value εap, the radial strain peak value εrp, the axial strain it is remaining
Value εar, the radial strain residual value εrrWith stress parameters σa, determine the second energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
Further, the brittleness index of the rock sample to be measured is equal to the first brittleness relevant parameter, second brittleness
The product of relevant parameter and the third brittleness relevant parameter.
In the present embodiment, the measurement device of the brittleness index of the present embodiment can be performed provided by Embodiment 2 of the present invention crisp
The measuring method of sex index, realization principle is similar, and details are not described herein again.
The embodiment of the present invention obtains whole English teaching by analyzing Rock Triaxial Compression Experiment, is determined based on curve
Three new indexs, to carry out brittleness index evaluation based on three new indexs.Data needed for this programme are less, and can be straight
It connects, accurately evaluate rock brittleness, so as to establish solid foundation for Field design.
Fig. 5 is a kind of structural schematic diagram of the sensing equipment for brittleness index that the embodiment of the present invention five provides, comprising: storage
Device 501 and processor 502.
The memory 501, for storing computer program.
Wherein, the processor 502 executes the computer program in the memory 501, to realize any embodiment
The method of offer.
The embodiment of the present invention six provides a kind of computer readable storage medium, is stored thereon with computer program, described
The method that computer program is executed by processor to realize the offer of any embodiment.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
Its embodiment.The present invention is directed to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claims are pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by appended claims
System.
Claims (10)
1. a kind of measuring method of brittleness index characterized by comprising
Obtain the multiple groups experimental data of rock sample to be measured, wherein experimental data described in each group includes the rock-like to be measured
The strain parameter that stress parameters suffered by product and the rock sample to be measured generate under the stress parameters；
According to the multiple groups experimental data, determine that the first brittleness relevant parameter, the second brittleness relevant parameter are related to third brittleness
Parameter, wherein elastic strain energy of the rock sample to be measured described in the first brittleness correlation parameter characterization in the peak last stage goes to inhale
Receive the degree of external force acting, rock sample energy dissipation in rupture process to be measured described in the second brittleness correlation parameter characterization
Speed degree, the consumption of elastic strain energy of the rock sample to be measured described in the third brittleness correlation parameter characterization in post-peaking phase
The degree of dissipating；
According to the first brittleness relevant parameter, the second brittleness relevant parameter and the third brittleness relevant parameter, determine
The brittleness index of the rock sample to be measured.
2. the method according to claim 1, wherein determining the first brittlement phase according to the multiple groups experimental data
Close parameter, comprising:
According to the multiple groups experimental data, the elastic strain energy parameter of the rock sample to be measured is determinedFirst energy parameter
Up, wherein the first energy parameter UpCharacterize the energy that the rock sample to be measured is absorbed in the peak last stage；
According to the elastic strain energy parameterWith the first energy parameter Up, determine the first brittleness relevant parameter
3. the method according to claim 1, wherein determining the second brittlement phase according to the multiple groups experimental data
Close parameter, comprising:
According to the multiple groups experimental data, the elastic strain energy parameter of the rock sample to be measured is determinedThe rock to be measured
The residual strain energy parameter of sampleSecond energy parameter W, wherein the second energy parameter W characterizes the rock to be measured
Sample meets with stresses and the energy that is absorbed when confining pressure in collapse stage；
According to the elastic strain energy parameterThe residual strain energy parameterWith the second energy parameter W, is determined
Two brittleness relevant parameters
4. the method according to claim 1, wherein determining third brittlement phase according to the multiple groups experimental data
Close parameter, comprising:
According to the multiple groups experimental data, the elastic strain energy parameter of the rock sample to be measured is determinedThe rock to be measured
The residual strain energy parameter of sample
According to the elastic strain energy parameterWith the residual strain energy parameterDetermine third brittleness relevant parameter
5. according to the described in any item methods of claim 2-4, which is characterized in that the strain parameter includes axial strain parameter
With radial strain parameter；According to the multiple groups experimental data, the elastic strain energy parameter of the rock sample to be measured is determined
Include:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress parameters
The curve of mapping relations between radial strain parameter, between the second curve characterization stress parameters and axial strain parameter
Mapping relations curve, include axial strain peak point in first curve；
By the corresponding stress parameters of the axial strain peak point, as peak stress σp；
Determine straight slope corresponding to the linear elasticity strain stage in first curve, and using the straight slope as bullet
Property modulus E；
It determines the first strain point of at least one of the linear elasticity strain stage, determines that each described first strain point is corresponding
Axial strain parameter, corresponding with the first strain point described in each the second strain point is determined in second curve, really
The corresponding radial strain parameter of fixed each described second strain point, wherein each described first strain point and corresponding the
Two strain points stress parameters having the same；
According to each axial strain parameter and each radial strain parameter, Poisson's ratio v is determined；
According to the peak stress σp, the confining pressure born of the elastic modulus E, the Poisson's ratio v and the rock sample to be measured
σc, determine the elastic strain energy parameter of the rock sample to be measured
6. according to the method described in claim 2, it is characterized in that, the strain parameter includes that axial strain parameter and radial direction are answered
Variable element；According to the multiple groups experimental data, the first energy parameter U of the rock sample to be measured is determinedp, comprising:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress parameters
The curve of mapping relations between radial strain parameter, between the second curve characterization stress parameters and axial strain parameter
Mapping relations curve, include axial strain peak point in first curve；
By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；
Third strain point corresponding with the axial strain peak point is determined in second curve, wherein the axial direction is answered
Become peak point and the third strain point stress parameters having the same；
By the corresponding radial strain parameter of the third strain point, as radial strain peak value εrp；
According to the axial strain peak value εap, the radial strain peak value εrp, stress parameters σaWith the rock-like to be measured
The confining pressure σ that product are bornc, determine the first energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain ginseng
Number, εa、εrFor variable.
7. the method according to claim 3 or 4, which is characterized in that the strain parameter includes axial strain parameter and diameter
To strain parameter；According to the multiple groups experimental data, the residual strain energy parameter of the rock sample to be measured is determinedInclude:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress parameters
The curve of mapping relations between radial strain parameter, between the second curve characterization stress parameters and axial strain parameter
Mapping relations curve, include overstrain point in first curve；
By the corresponding stress parameters of the overstrain point, as residual force σp；
Determine straight slope corresponding to the linear elasticity strain stage in first curve, and using the straight slope as bullet
Property modulus E；
It determines the first strain point of at least one of the linear elasticity strain stage, determines that each described first strain point is corresponding
Axial strain parameter, corresponding with the first strain point described in each the second strain point is determined in second curve, really
The corresponding radial strain parameter of fixed each described second strain point, wherein each described first strain point and corresponding the
Two strain points stress parameters having the same；
According to each axial strain parameter and each radial strain parameter, Poisson's ratio v is determined；
According to the residual stress σr, the confining pressure born of the elastic modulus E, the Poisson's ratio v and the rock sample to be measured
σc, determine the residual strain energy parameter of the rock sample to be measured
8. according to the method described in claim 3, it is characterized in that, the strain parameter includes that axial strain parameter and radial direction are answered
Variable element；According to the multiple groups experimental data, the second energy parameter W of the rock sample to be measured is determined, comprising:
According to the multiple groups experimental data, the first curve and the second curve are determined, wherein first curve characterizes stress parameters
The curve of mapping relations between radial strain parameter, between the second curve characterization stress parameters and axial strain parameter
Mapping relations curve, include axial strain peak point and overstrain point in first curve；
By the corresponding axial strain parameter of the axial strain peak point, as axial strain peak value εap；
Third strain point corresponding with the axial strain peak point is determined in second curve, wherein the axial direction is answered
Become peak point and the third strain point stress parameters having the same；
By the corresponding radial strain parameter of the third strain point, as radial strain peak value εrp；
By the corresponding axial strain parameter of the overstrain point, as axial strain residual value εar；
The 4th strain point corresponding with the overstrain point is determined in second curve, wherein the overstrain point
With the 4th strain point stress parameters having the same；
By the corresponding radial strain parameter of the 4th strain point, as radial strain peak value εrp；
According to the axial strain peak value εap, the radial strain peak value εrp, the axial strain residual value εar, institute
State radial strain residual value εrrWith stress parameters σa, determine the second energy parameter of the rock sample to be measuredWherein, εaFor axial strain parameter, εrFor radial strain parameter,
εa、εrFor variable.
9. method according to claim 1-4, which is characterized in that the brittleness index of the rock sample to be measured is equal to institute
State the product of the first brittleness relevant parameter, the second brittleness relevant parameter and the third brittleness relevant parameter.
10. a kind of measurement device of brittleness index characterized by comprising
Acquiring unit, for obtaining the multiple groups experimental data of rock sample to be measured, wherein experimental data described in each group includes institute
State the strain parameter that stress parameters suffered by rock sample to be measured and the rock sample to be measured generate under the stress parameters；
First determination unit, for determining the first brittleness relevant parameter, the second brittleness correlation ginseng according to the multiple groups experimental data
Several and third brittleness relevant parameter, wherein rock sample to be measured described in the first brittleness correlation parameter characterization is in the peak last stage
Elastic strain energy go to absorb the degree of external force acting, rock sample to be measured described in the second brittleness correlation parameter characterization is broken
The speed degree of energy dissipation during splitting, rock sample to be measured described in the third brittleness correlation parameter characterization is in post-peaking phase
Elastic strain energy dissipation degree；
Second determination unit, for according to the first brittleness relevant parameter, the second brittleness relevant parameter and the third
Brittleness relevant parameter determines the brittleness index of the rock sample to be measured.
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| CN110926941A (en) * | 2019-11-15 | 2020-03-27 | 长江大学 | Shale brittleness index evaluation method, device and system |
| CN111238931A (en) * | 2019-12-30 | 2020-06-05 | 长江大学 | Shale brittleness index evaluation method based on energy evolution |
| CN111353239A (en) * | 2020-03-26 | 2020-06-30 | 武汉大学 | Rock brittleness index calculation method and device |
| CN113607547A (en) * | 2021-08-12 | 2021-11-05 | 重庆大学 | Elastic strain energy acquisition method based on initial point of rock fracture |
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