CN103115820B - Method for confirming anisotropism of jointed rock mass - Google Patents
Method for confirming anisotropism of jointed rock mass Download PDFInfo
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Abstract
The invention provides a method for confirming the anisotropism of jointed rock mass. The method comprises the following steps of: firstly building the multi-scale jointed rock mass capable of sufficiently reflecting the rock mechanical property, the joint mechanical property and the joint spatial distribution characteristic, wherein the jointed rock mass with different scales comprises three groups of samples, and the long axial directions of the samples are respectively along the X-direction, the Y-direction and the Z-direction; carrying out virtual uniaxial compression loading along the long axial directions of various kinds of jointed rock mass to obtain a stress-strain curve, and extracting the mechanical parameters of the jointed rock mass along the X-direction, the Y-direction and the Z-direction, i.e. the uniaxial compressive strength, the elasticity modulus and the like; and building an anisotropism index Ksi, and confirming the anisotropism of the mechanical parameters of the jointed rock mass along the different axial directions, i.e. the uniaxial compressive strength, the elasticity modulus and the like under different scales, so that the anisotropic characteristics of the jointed rock mass can be quantitatively researched. The invention provides a method which is simple in principle, convenient to operate, low in cost and good in use effect, so that the anisotropic characteristics of the jointed rock mass can be confirmed.
Description
Technical field:
The present invention relates to a kind of anisotropic definite method of jointed rock mass, belong to geomaterial Research on Mechanical Properties field, be applicable to the research of all kinds of rock engineering mechanical characteristics such as side slope, tunnel, the dam foundation.
Technical background:
It is very long that history is deposited in the tax of rock mass, once be subject to repeatedly geological structure, the mode of each geological structure is different with feature, thereby formed differ in size, many groups structural plane that direction is different, therefore, existing rock mass is the rock mass that is subject to different times, many group structural planes of different nature cutting.The cutting of these structural planes, has caused the uncontinuity of rock mass, has obviously changed the stress characteristic of rock mass, causes rock mass mechanics character to have obvious directivity.Therefore, the anisotropic character of how to confirm jointed rock mass, thus guarantee appropriate design, construction and the operation of Geotechnical Engineering, become one of important process of this research field.
For intact rock, the strength characteristics of rock can be thought isotropic.And for the rock mass that contains some discontinuity surfaces such as joint fissure, due to the impact of its discontinuity surface, the strength characteristics of rock mass shows as anisotropy, i.e. structural plane effect.At present in the engineering design of stratum superficial part, still roughly jointed rock mass is approximately to isotropic body, at Considering Joint, during to the attenuation of rock mass strength, all according to joint connection rate, the intensive parameter of intact rock is carried out to reduction, thereby fail effectively to reflect the anisotropic properties of rock mass.Research shows, due to the existence at joint, rock mass shows significant anisotropic character.In Geotechnical Engineering, along with the increase of joint quantity, the parameters such as the compressive strength of jointed rock mass, deformation modulus obviously reduce, and its anisotropy can not be ignored.But complexity and scrambling due to joint in natural rock mass, its research contents also comprises distribution scale and the rule of probing into joint in rock mass, by determining compressive strength and the deformation modulus of jointed rock mass different directions, obtain its anisotropic character, thereby search out the jointed rock mass anisotropy that has more engineering using value, determine method.
At present, determine that the anisotropic common method of jointed rock mass is mostly based on continuum mechanics theory, Chinese scholars mainly contains following several research method: be out of shape method of equal effects, Energy Equivalent method, fracture set structure Tensor Method, continuum damage mechanics method and be certainly in harmony theoretical.Document " Zhang Wu, Zhang Xianhong. the elastic model of jointed rock mass [J]. Geotechnical Engineering journal, 1987,09 (04): 33 ?44. ", utilize distortion to equate or coordinate, derived the elastic constitutive model model of multidirectional jointed rock mass.Document " Zhang Fei; Lei Huanan. Anisotropic Elastic Models of Probahilistic Structure Jointed Rock Mass [J]. metal mine; 1994; 211 (01): 11 ?14. ", based on compound substance theory of elasticity, from macroscopic view, the anisotropic properties of jointed rock mass, the anisotropic elastic matrix of the jointed rock mass of having derived have been investigated.Document " Xu Weiya; Zheng Wentang. prismatic jointing Dam Foundation Rock three dimensional anisotropic numerical analysis [J]. rock-soil mechanics, 2010,31 (3): 950 ?955. ", utilize distortion equivalence principle, derived the Equivalent Elasticity constitutive model of regular prism prismatic jointing rock mass.Yet the anisotropy of above analytical approach research jointed rock mass, exists more hypothesis, and theoretical system is complicated, effect is not good, is difficult to be widely used in the anisotropy research of Practical Project rock mass.
Summary of the invention:
The object of the invention is to overcome the deficiency of the aspects such as more hypothesis that traditional research jointed rock mass anisotropy theoretical analysis method exists and theoretical system complexity, a kind of method that principle is simple, easy to operate, with low cost, result of use is good is provided, is convenient to determine the anisotropic properties of jointed rock mass.
The anisotropic definite method of a kind of jointed rock mass of the present invention, its step is as follows:
(1) carry out indoor rock mechanics experiment, by indoor uniaxial compression test, obtain the uniaxial compressive strength σ of rock
ucs, elastic modulus E, Poisson ratio ν; By indoor triaxial compression test chamber, obtain the compressive strength under different confined pressures, and draw Mohr Circle of Plastic and strength envelope, can obtain cohesion c and the angle of internal friction of rock
(2) carry out indoor joint mechanical test, by indoor joint direct shear test, obtain Jian Qie Ying Li under normal direction load ?strain curve; According to the peak shear strength under different normal direction loads, draw peak strength envelope, obtain the peak value cohesion c at joint
j ?pand angle of internal friction
according to the residual shear strength under different normal direction loads, draw residual strength envelope, obtain the remaining cohesion c at joint
j ?rand residual angle of internal friction
(3) determine that granule carefully sees parameter.The thin sight parameter of describing particle has: ball density p, smallest particles radius R
min, maximum compare R with minimum grain size
max/ R
min, contact Young modulus E
c, contact method is to comparing k with shear stiffness
n/ k
s, coefficientoffrictionμ; The thin sight parameter that description is cohered has: cohere Young modulus
cohere normal direction and shear stiffness ratio
cohere normal strength mean value
cohere normal strength standard deviation
cohere tangential average strength
cohere tangential strength criterion poor
adopt particle and cohere to build granule sample, its size and indoor rock mechanics experiment sample are consistent.Give the particle of granule sample supposition and cohere thin sight parameter, and it is carried out to virtual load calculating.By the granule sample bulk parameter calculating, the rock sample bulk parameter obtaining with indoor rock mechanics experiment contrasts.By continuous adjustment granule, carefully see parameter, when calculating bulk parameter with test findings when basically identical, just can determine that rational granule carefully sees parameter.
(4) determine that smooth joint carefully sees parameter.The thin sight parameter of describing smooth joint has: normal stiffness sj_kn, shear stiffness sj_ks, friction factor sj_fric, cut swollen angle sj_da, cohere normal strength sj_bns, cohere system cohesion sj_bcoh, cohere system friction angle sj_bfa.Adopt granule and smooth joint to build rock joint direct shear test sample, its size and indoor joint staight scissors sample are consistent, and granule sample is carefully seen parameter and determined by step (3).Give the thin sight parameter of smooth joint supposition, carry out the virtual direct shear test of rock joint sample, by the joint bulk parameter calculating, the joint bulk parameter obtaining with indoor joint direct shear test contrasts.By the smooth joint of continuous adjustment, carefully see parameter, when joint direct shear test, calculate bulk parameter with test findings when basically identical, just can determine that rational smooth joint carefully sees parameter.
(5) build joint network.First, by on-the-spot joint geologic examination, for tendency, inclination angle, spacing, mark progress row probability statistical analysis and the offset correction at joint; Then, according to the data after proofreading and correct, adopt stochastic model theory to build joint network; Finally, joint network data and joint offset correction data are contrasted, verify both statistics similarities.
(6) build multiple dimensioned jointed rock mass.First, adopt the definite granule of step (3) carefully to see parameter, build the multiple dimensioned granule samples of three classes such as laboratory yardstick, test in situ yardstick and engineering yardstick.For making result of calculation have comparability, the long aspect ratio value of all kinds of granule samples is 2:1:1.All kinds of granule samples comprise respectively three groups of granule samples, and its long axis direction is respectively along X, Y, Z-direction.Then, the constructed joint network of step (5) is embedded in all kinds of granule samples, the characteristic of joint network is the determined smooth joint of step (4) and carefully sees parameter; Finally, just can obtain fully reflecting the multiple dimensioned jointed rock mass of joint distribution feature.Wherein, yardstick sample in laboratory is not containing joint.
(7) for the constructed multiple dimensioned jointed rock mass of step (6), along long axis direction, carry out virtual uniaxial compression loading, obtain all kinds of jointed rock mass along X, Y, Z axis to Ying Li ?strain curve.
(8) the jointed rock mass Ying Li obtaining according to step (7) ?strain curve, extract all kinds of jointed rock mass along X, Y, Z axis to the uniaxial compressive strength loading and elastic modulus (being the slope of linearity range stress-strain diagram before uniaxial compressive strength), do respectively jointed rock mass uniaxial compressive strength, elastic modulus and loading to the relation curve of specimen size.For determining the anisotropic degree of all kinds of jointed rock mass, set up anisotropic index ξ, its expression formula is
In formula, γ
x, γ
y, γ
zbe respectively in similar jointed rock mass sample, along X, Y, Z axis, load the calculation of parameter value obtaining;
in similar jointed rock mass sample, γ
x, γ
y, γ
zcalculation of parameter mean value; γ
labcalculation of parameter value for laboratory yardstick sample.Finally, by anisotropic index ξ, can differentiate the anisotropic properties of jointed rock mass under different scale.
(9) the anisotropic definite method of other mechanics parameter of jointed rock mass (as three axle compressive strength, shear strength, deformation modulus, Poisson ratio, cohesion, angle of internal friction etc.), can in like manner ask for by abovementioned steps.
Accompanying drawing explanation:
Fig. 1 be in the present invention under granule sample compression-loaded Ji calculate Ying Li ?strain curve;
Fig. 2 be the Ji of the virtual direct shear test in smooth joint in the present invention calculate Ying Li ?strain curve;
Fig. 3 is joint network diagram in the present invention;
Fig. 4 is the multiple dimensioned jointed rock mass schematic diagram loading along X axis in the present invention;
Fig. 5 is the multiple dimensioned jointed rock mass schematic diagram loading along Y-axis in the present invention;
Fig. 6 is the multiple dimensioned jointed rock mass schematic diagram loading along Z-axis direction in the present invention;
Fig. 7 be the virtual uniaxial compression Ying Li of multiple dimensioned jointed rock mass that loads along X axis in the present invention ?strain curve;
Fig. 8 be the virtual uniaxial compression Ying Li of multiple dimensioned jointed rock mass that loads along Y-axis in the present invention ?strain curve;
Fig. 9 be the virtual uniaxial compression Ying Li of multiple dimensioned jointed rock mass that loads along Z-axis direction in the present invention ?strain curve;
Figure 10 is jointed rock mass uniaxial compressive strength and the graph of a relation loading to specimen size in the present invention;
Figure 11 is jointed rock mass elastic modulus and the graph of a relation loading to specimen size in the present invention.
Embodiment:
Take certain outdoors iron ore rock matter high slope is example, introduces a kind of anisotropic definite method of jointed rock mass, comprises following steps:
(1) carry out indoor rock mechanics experiment, obtain all kinds of bulk parameters of spot sampling rock.By indoor uniaxial compression test, obtain the uniaxial compressive strength σ of rock
ucs, elastic modulus E, Poisson ratio ν; By laboratory triaxial compression test, obtain the compressive strength under different confined pressures, and draw Mohr Circle of Plastic and strength envelope, can obtain cohesion c and the angle of internal friction of rock
.
Table 1, for fetching at the scene after rock (pierite) sample, carries out indoor mechanical test, the rock bulk parameter of acquisition.
(2) carry out indoor joint mechanical test, obtain all kinds of bulk parameters at spot sampling joint.By indoor joint direct shear test, obtain Jian Qie Ying Li under normal direction load ?strain curve; According to the peak shear strength under different normal direction loads, draw peak strength envelope, obtain the peak value cohesion c at joint
j ?pand angle of internal friction
according to the residual shear strength under different normal direction loads, draw residual strength envelope, obtain the remaining cohesion c at joint
j ?rand residual angle of internal friction
Table 2, for to fetch after the rock sample containing joint at the scene, carries out indoor joint direct shear test, the joint bulk parameter of acquisition.
(3) granule is carefully seen parameter and is determined.By building granule, to characterize rock.Granule consists of with cohering particle, and cohesiveness is similar to the gum material adhering between two particles.In granule, the thin sight parameter of describing particle has: ball density p, smallest particles radius R
min, maximum compare R with minimum grain size
max/ R
min, contact Young modulus E
c, contact method is to comparing k with shear stiffness
n/ k
s, coefficientoffrictionμ; The thin sight parameter that description is cohered has: cohere Young modulus
cohere normal direction and shear stiffness ratio
cohere normal strength mean value
cohere normal strength standard deviation
cohere tangential average strength
cohere tangential strength criterion poor
adopt particle and cohere to build granule sample, its size and indoor rock mechanics experiment sample are consistent.Give the particle of granule sample supposition and cohere thin sight parameter, and it is carried out to virtual load calculating.By the granule sample bulk parameter calculating, the rock sample bulk parameter obtaining with indoor rock mechanics experiment contrasts.By continuous adjustment granule, carefully see parameter, when calculating when basically identical with test findings bulk parameter, just can determine that rational granule carefully sees parameter.
Through debugging repeatedly, the granule described in employing table 3 is carefully seen parameter, carries out single shaft and three axle fictitious compress recuperations and loads, obtained the granule Ji shown in Fig. 1 calculate Ying Li ?strain curve.The calculating bulk parameter of granule sample is as described in Table 4, basic consistent with the shop experiment rock bulk parameter described in table 1, can think that thus it is rational that determined granule is carefully seen parameter.
(4) smooth joint is carefully seen parameter and is determined.By building smooth joint, to characterize the joint in rock mass.In the character at smooth joint and rock mass, the character at joint is similar.The thin sight parameter of describing smooth joint has: normal stiffness sj_kn, shear stiffness sj_ks, friction factor sj_fric, cut swollen angle sj_da, cohere normal strength sj_bns, cohere system cohesion sj_bcoh, cohere system friction angle sj_bfa.Adopt granule and smooth joint to build rock joint direct shear test sample, its size and indoor joint staight scissors sample are consistent, and granule sample is carefully seen parameter and determined by step (3).Give the thin sight parameter of smooth joint supposition, carry out the virtual direct shear test of rock joint sample, by the joint bulk parameter calculating, the joint bulk parameter obtaining with indoor joint direct shear test contrasts.By the smooth joint of continuous adjustment, carefully see parameter, when joint direct shear test, calculate when basically identical with test findings bulk parameter, just can determine that rational smooth joint carefully sees parameter.
Through debugging repeatedly, parameter is carefully seen at the smooth joint described in employing table 5, carries out the virtual direct shear test in smooth joint, obtained the smooth joint Ji shown in Fig. 2 calculate Ying Li ?strain curve.According to the peak shear strength under different normal direction loads, draw peak strength envelope, can obtain peak value cohesion and the peak friction angle at smooth joint; According to the residual shear strength under different normal direction loads, draw residual strength envelope, can obtain remaining cohesion and the residual angle of internal friction at smooth joint.The calculating bulk parameter at smooth joint is as described in Table 6, basic consistent with the indoor direct shear test bulk parameter described in table 2, can think that thus it is rational that parameter is carefully seen at determined smooth joint.
(5) joint network struction.First, by on-the-spot joint geologic examination, for tendency, inclination angle, spacing, mark progress row probability statistical analysis and the offset correction at joint; Then, according to the data after proofreading and correct, adopt stochastic model theory to build joint network; Finally, joint network data and joint offset correction data are contrasted, verify both statistics similarities.
Table 7 is for by sampling to on-the-spot joint, after probability statistics, offset correction, joint probability Distribution Model and the parameter estimation of acquisition.Fig. 3 is according to the data after proofreading and correct, and adopts stochastic model theory to build the joint network that is of a size of 40m * 40m * 40m.
(6) build multiple dimensioned jointed rock mass.First, adopt the definite granule of step (3) carefully to see parameter, build the multiple dimensioned granule samples of three classes such as laboratory yardstick, test in situ yardstick and engineering yardstick.For making result of calculation have comparability, the long aspect ratio value of all kinds of granule samples is 2:1:1.All kinds of granule samples comprise respectively three groups of granule samples, and its long axis direction is respectively along X, Y, Z-direction.Then, the constructed joint network of step (5) is embedded in all kinds of granule samples, the characteristic of joint network is the determined smooth joint of step (4) and carefully sees parameter; Finally, just can obtain fully reflecting the multiple dimensioned jointed rock mass of joint distribution feature.Wherein, yardstick sample in laboratory is not containing joint.
Granule described in employing table 3 is carefully seen parameter and is built the granules such as laboratory yardstick (RM01), test in situ yardstick (RM02, RM03) and engineering yardstick (RM04, RM05, RM06, RM07), and wherein RM01 does not contain the clean rock granule sample at joint.All kinds of granule samples (RM02～RM07) comprise respectively three groups of granule samples, and its long axis direction is respectively along X, Y, Z-direction.RM01～RM07 moulded dimension is respectively 0.1m * 0.05m * 0.05m, 1m * 0.5m * 0.5m, 2m * 1m * 1m, 4m * 2m * 2m, 8m * 4m * 4m, 10m * 5m * 5m, 20m * 10m * 10m.Then, by thering is smooth joint as described in Table 5 and carefully see the joint network of parameter, be embedded in granule RM01～RM07, can obtain multiple dimensioned jointed rock mass, as shown in Fig. 4, Fig. 5, Fig. 6.
(7) for the constructed multiple dimensioned jointed rock mass of step (6), along long axis direction, carry out virtual uniaxial compression loading, obtain all kinds of jointed rock mass along X, Y, Z axis to Ying Li ?strain curve.
Fig. 7 is to the jointed rock mass RM01～RM07 in Fig. 4, along X-axis, carries out virtual uniaxial compression loading, all kinds of jointed rock mass Ying Li that obtain ?strain curve.Fig. 8 is to the jointed rock mass RM01～RM07 in Fig. 5, along Y-axis, carries out virtual uniaxial compression loading, all kinds of Yan Ti Ying Li that obtain ?strain curve.Fig. 9 is to the jointed rock mass RM01～RM07 in Fig. 6, along Z axis, carries out virtual uniaxial compression loading, all kinds of Yan Ti Ying Li that obtain ?strain curve.
(8) the jointed rock mass Ying Li obtaining according to step (7) ?strain curve, extract all kinds of jointed rock mass along X, Y, Z axis to the uniaxial compressive strength loading and elastic modulus (being the slope of linearity range stress-strain diagram before uniaxial compressive strength), do respectively jointed rock mass uniaxial compressive strength, elastic modulus and loading to the relation curve of specimen size.For determining the anisotropic degree of all kinds of jointed rock mass, set up anisotropic index ξ, its expression formula is
In formula, γ
x, γ
y, γ
zbe respectively in similar jointed rock mass sample, along X, Y, Z axis, load the calculation of parameter value obtaining;
for γ in similar jointed rock mass sample
x, γ
y, γ
zcalculation of parameter mean value; γ
labcalculation of parameter value for laboratory yardstick sample.Finally, by anisotropic index ξ, can differentiate the anisotropic properties of jointed rock mass under different scale.
Fig. 7, Fig. 8, Fig. 9 be Ying Li that all kinds of jointed rock mass obtain to loading along X, Y, Z axis ?strain curve.Extract all kinds of jointed rock mass uniaxial compressive strengths and elastic modulus, do jointed rock mass uniaxial compressive strength, elastic modulus and loading to the relation curve of specimen size, as shown in Figure 10, Figure 11.
As shown in Figure 10, yardstick uniaxial compressive strength in rock sample laboratory is 120MPa.When sample axial dimension is 1m, jointed rock mass is respectively 89.1MPa, 65.5MPa, 40.2MPa along the uniaxial compressive strength of X, Y, Z axis.Adopt formula
The anisotropic index ξ that can ask jointed rock mass is 0.166395.In like manner, when sample axial dimension is respectively 2m, 4m, 8m, 10m, 20m, the anisotropic index ξ calculating is respectively 0.066257,0.035683,0.021585,0.007827,0.004714.Visible, with jointed rock mass size, increase gradually (except RM01), the anisotropic index of jointed rock mass uniaxial compressive strength levels off to 0 gradually, shows that jointed rock mass is converted to isotropic medium gradually.
In addition, as shown in Figure 11, rock sample laboratory yardstick elastic modulus is 54.5GPa.When sample axial dimension is 1m, jointed rock mass is respectively 42.4GPa, 33.3GPa, 32.2MPa along the elastic modulus of X, Y, Z axis.Adopt formula
The anisotropic index ξ that can ask jointed rock mass is 0.083820.In like manner, when sample axial dimension is respectively 2m, 4m, 8m, 10m, 20m, the anisotropic index ξ calculating is respectively 0.039883,0.047012,0.038109,0.009485,0.000786.Visible, with jointed rock mass size, increase gradually (except RM01), the anisotropic index of jointed rock mass elastic modulus also levels off to 0 gradually, shows that equally jointed rock mass is converted to isotropic medium gradually.
Table 1 rock bulk parameter
Table 2 joint bulk parameter
Table 3 granule is carefully seen parameter
Table 4 granule calculates bulk parameter
Parameter is carefully seen at the smooth joint of table 5
The calculating bulk parameter at the smooth joint of table 6
Table 7 joint probability Distribution Model and parameter estimation
Claims (2)
1. the anisotropic definite method of jointed rock mass, is characterized in that, described method comprises following sequential steps:
One, build multiple dimensioned jointed rock mass: first, according to indoor rock and joint mechanical test result, determine the thin sight parameter at granule and smooth joint, simultaneously in conjunction with on-the-spot joint geologic examination, build joint network; Then, adopt fixed granule carefully to see parameter, build laboratory yardstick, test in situ yardstick and the multiple dimensioned granule sample of engineering yardstick three class; For making result of calculation have comparability, the long aspect ratio value of all kinds of granule samples is 2:1:1; All kinds of granule samples comprise respectively three groups of granule samples, and its long axis direction is respectively along X, Y, Z-direction; The joint network of structure is embedded in all kinds of granule samples, and the characteristic of joint network adopts fixed smooth joint carefully to see parameter; Finally, just can obtain fully reflecting the multiple dimensioned jointed rock mass of joint distribution feature; Wherein, yardstick sample in laboratory is not containing joint;
Two, for the constructed multiple dimensioned jointed rock mass of step 1, along long axis direction, carry out virtual uniaxial compression loading, obtain all kinds of jointed rock mass along X, Y, Z axis to Ying Li ?strain curve;
Three, the jointed rock mass Ying Li obtaining according to step 2 ?strain curve, extract all kinds of jointed rock mass along X, Y, Z axis to the uniaxial compressive strength and the elastic modulus mechanics parameter that load, do respectively jointed rock mass uniaxial compressive strength, elastic modulus and loading to the relation curve of specimen size; For determining the anisotropic degree of all kinds of jointed rock mass, set up anisotropic index ξ, by anisotropic index ξ, can differentiate the anisotropic properties of jointed rock mass under different scale;
In wherein said step 1, according to indoor rock and joint mechanical test result, determine that the concrete grammar of the thin sight parameter at granule and smooth joint comprises the following steps:
(1) carry out indoor rock mechanics experiment: by indoor uniaxial compression test, obtain the uniaxial compressive strength σ of rock
ucs, elastic modulus E, Poisson ratio ν; By indoor triaxial compression test chamber, obtain the compressive strength under different confined pressures, and draw Mohr Circle of Plastic and strength envelope, can obtain cohesion c and the angle of internal friction of rock
(2) carry out indoor joint mechanical test: by indoor joint direct shear test, obtain Jian Qie Ying Li under normal direction load ?strain curve; According to the peak shear strength under different normal direction loads, draw peak strength envelope, obtain the peak value cohesion c at joint
j ?pand angle of internal friction
according to the residual shear strength under different normal direction loads, draw residual strength envelope, obtain the remaining cohesion c at joint
j ?rand residual angle of internal friction
(3) determine that granule carefully sees parameter: the thin sight parameter of describing particle has: ball density p, smallest particles radius R
min, maximum compare R with minimum grain size
max/ R
min, contact Young modulus E
c, contact method is to comparing k with shear stiffness
n/ k
s, coefficientoffrictionμ; The thin sight parameter that description is cohered has: cohere Young modulus
cohere normal direction and shear stiffness ratio
cohere normal strength mean value
cohere normal strength standard deviation
cohere tangential average strength
cohere tangential strength criterion poor
adopt particle and cohere to build granule sample, its size and indoor rock mechanics experiment sample are consistent; Give the particle of granule sample supposition and cohere thin sight parameter, and it is carried out to virtual load calculating; By the granule sample bulk parameter calculating, the rock sample bulk parameter obtaining with indoor rock mechanics experiment contrasts; By continuous adjustment granule, carefully see parameter, when calculating bulk parameter with test findings when basically identical, just can determine that rational granule carefully sees parameter;
(4) determine that smooth joint carefully sees parameter: the thin sight parameter of describing smooth joint has normal stiffness sj_kn, shear stiffness sj_ks, friction factor sj_fric, cuts swollen angle sj_da, coheres normal strength sj_bns, coheres system cohesion sj_bcoh, coheres system friction angle sj_bfa; Adopt granule and smooth joint to build rock joint direct shear test sample, its size and indoor joint staight scissors sample are consistent, and granule is carefully seen parameter and determined by step (3); Give the thin sight parameter of smooth joint supposition, carry out the virtual direct shear test of rock joint sample, by the joint bulk parameter calculating, the joint bulk parameter obtaining with indoor joint direct shear test contrasts; By the smooth joint of continuous adjustment, carefully see parameter, when joint direct shear test, calculate bulk parameter with test findings when basically identical, just can determine that rational smooth joint carefully sees parameter;
The method that builds joint network in described step 1 is: first, and by on-the-spot joint geologic examination, for tendency, inclination angle, spacing, mark progress row probability statistical analysis and the offset correction at joint; Then, according to the data after proofreading and correct, adopt stochastic model theory to build joint network; Finally, joint network data and joint offset correction data are contrasted, verify both statistics similarities.
2. definite method according to claim 1, is characterized in that, in step 3
in formula, γ
x, γ
y, γ
zbe respectively in similar jointed rock mass sample, along X, Y, Z axis, load the calculation of parameter value obtaining;
in similar jointed rock mass sample, γ
x, γ
y, γ
zcalculation of parameter mean value; γ
labcalculation of parameter value for laboratory yardstick sample.
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| CN101603960B (en) * | 2009-07-01 | 2012-11-07 | 西安理工大学 | Method for determining nonpenetrating jointed and fractured rock mass deformation parameter |
| US8498853B2 (en) * | 2009-07-20 | 2013-07-30 | Exxonmobil Upstream Research Company | Petrophysical method for predicting plastic mechanical properties in rock formations |
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| CN109580400A (en) * | 2018-12-27 | 2019-04-05 | 深圳大学 | High temperature and middle low strain dynamic rate load lower solid dynamic anisotropic properties test method |
| CN110763182A (en) * | 2019-10-17 | 2020-02-07 | 浙江岩创科技有限公司 | Method for calculating deformation curve of rock mass in whole process |
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