CN106706393A - Method for determining representative elementary volume (REV) of columnar jointed rock mass through similarity model - Google Patents
Method for determining representative elementary volume (REV) of columnar jointed rock mass through similarity model Download PDFInfo
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- CN106706393A CN106706393A CN201710096101.7A CN201710096101A CN106706393A CN 106706393 A CN106706393 A CN 106706393A CN 201710096101 A CN201710096101 A CN 201710096101A CN 106706393 A CN106706393 A CN 106706393A
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- rock mass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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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Abstract
The invention discloses a method for determining the representative elementary volume (REV) of columnar jointed rock mass through a similarity model. The method is characterized by comprising the following steps: 1) describing on-site columnar jointed rock mass to obtain feature information; 2) determining a similarity model; 3) making the determined model material into a columnar jointed pillaret; 4) machining and cutting the well bonded columnar jointed rock mass model into different dimensions; 5) performing indoor uniaxial compression test research on the samples machined in the step 4); and 6) processing the data in the step 5) to obtain the REV dimension of columnar jointed rock mass. According to the invention, the REV of columnar jointed rock mass is determined through the similarity model method, thereby having the advantages of economy and high efficiency in comparison with the existing method; and the method disclosed by the invention solves the problem that the on-site REV determination method based on different-dimension in-situ compression tests is difficult and high in cost, and can be used instead of the manner of on-site sampling and indoor REV dimension analysis.
Description
Technical field
The present invention relates to a kind of utilization scale model determine prismatical joint rock mass characteristics cell cube REV method and its should
With belonging to rock mechanics technical field.
Background technology
The formation of rock mass is deformation to be experienced during very long earth history, is destroyed, and is to build common with transformation
The result of effect.Due to different geologic origins, different types of lithology and petrofacies are formed, its material base for constituting rock mass；
Meanwhile, the table life of transformation effect and complexity that rock mass is subjected to repeated tectonic movements again is developed, and there occurs structural deformation and rupture,
Destroy the integrality of rock mass, extensive development different origins, different scales, the structural plane of different qualities, such as joint, crack
Deng these are repeated and intersecting discontinuity surface is by complete Rock cutting into irregular sillar.In the geology ring of volcano development
In border, basalt magma is gushed along surface cracks, is flowed on the ground, and basalt lava flow is formed after condensation.Condensed
Cheng Zhong, basalt magma has two cryosurfaces：One in rock flow face upper contact air, one covers in the case where rock flow face bottom surface contacts
Basement rock.Heat spreads from upper and lower two cryosurfaces.Primary hot tensile crack extends from upper and lower two condensations towards rock flow layer middle part
And ultimately form prismatical joint.The typical structure of prismatical joint rock mass is elongated polygon cylinder.Geological research shows, cylinder
Cross section be mainly regular or irregular polygon.
Prismatical joint rock mass has a REV size, and when the size of sample is less than REV sizes, size is smaller, this mould
The intensity and deformation modulus of type are bigger；When the size of sample constantly increases, the intensity and deformation modulus of this model all can be continuous
Reduce and tend towards stability, the intensity and deformation modulus of model do not change when more than a value, and size now is referred to as
It is REV sizes.
The Chinese invention patent of Application No. 201410141917.3, discloses a kind of rock structural face appearance and size effect
Analysis method should be measured, is a kind of analysis method for being capable of quantitative description rock structural face dimensional effect feature, but the method
Principle is complicated and does not provide corresponding program with simple flow, and the method is only applicable to relatively complete joint plane, and right
Do not applied to then in prismatical joint.
The content of the invention
To solve the deficiencies in the prior art, prismatical joint is determined using scale model it is an object of the invention to provide one kind
The method of rock mass characteristics cell cube REV and its application, for the technological gap existing for current this part, overcome existing column
The defect of joint model test sample generation.
In order to realize above-mentioned target, the present invention is adopted the following technical scheme that：
A kind of method that utilization scale model determines prismatical joint rock mass characteristics cell cube REV, it is characterized in that, including it is as follows
Step：
1) characteristic of the prismatical joint rock mass at scene is described, obtains this live prismatical joint characteristic information；
2) scale model is determined, including：The strength grade of the concrete of model rock mass, the size of concrete post are big
It is small, and the cementing material that each concrete post gluing is got up intensity；
3) prismatical joint duckpin is made using the cast material for determining, then pillar is cementing, and conserved；
4) the prismatical joint strata model that will be cemented carries out different size processing cutting；
5) by step 4) in the sample for processing carry out interior uniaxial compression test research；
6) by step 5) in data processed, obtain the feature unit body REV sizes of this prismatical joint rock mass.
Further, the step 1) in characteristic information include post draw ratio, different cross section shape and average side length.
Further, the step 2) in scale model according to the theory of similarity by the use of cement mortar material as model reality
Test material.
Further, the step 3) in the model of duckpin use regular hexagon.
Further, the length of side of the regular hexagon is 5mm.
Further, the step 4) in different size include：50mm*50mm*50mm, 70mm*70mm*70mm, 90mm*
90mm*90mm, 110mm*110mm*110mm, 130mm*130mm*130mm, 150mm*150mm*150mm.
A kind of foregoing utilization scale model determines the method for prismatical joint rock mass characteristics cell cube REV in mechanical analysis side
The application in face.
The beneficial effect that the present invention is reached：Determine prismatical joint rock mass REV using scale model method in the present invention, compared with
Existing method has cost-effective benefit, and the scene of can solve the problem that carries out the experiment of different size in-situ compression and determines REV methods
Difficulty and spend problem high, and can replace returning indoor from field sampling and analyzing REV sizes；This method is using similar
Except carrying out the analysis of REV sizes after module, it is also possible to carry out the mechanical characteristic of prismatical joint rock mass, seepage characteristic, rheology special
The analysis of the mechanics parameters such as property, method is simple, with low cost, effective.
Brief description of the drawings
Fig. 1 (a) (b) (c) is the rock mass description figure of all angles of the live prismatical joint rock mass of one embodiment；
Fig. 2 is the special die schematic diagram of the pillar model made for Fig. 1 according to this method；
Fig. 3 is that the size done according to Fig. 2 is the prismatical joint strata model schematic diagram of 50mm*50mm*50mm；
Fig. 4 is the REV sizing specification schematic diagrames of jointed rock mass；
Fig. 5 is prismatical joint rock mass REV size researchs.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
Typically determining the method for the feature unit body REV of Test in Situ is：Various sizes of column rock mass is taken at the scene to exist
Interior is done uniaxial tests and determines its change in mechanics, or carries out live various sizes of mechanical strength test, but this
Conventional method waste time and energy it is expensive, and this method be difficult to ensure that fetch come rock mass it is intact.
In order to study the REV sizes of prismatical joint rock mass, go to study prismatical joint rock mass the invention provides new dimension
REV sizes, the method mainly determines this size using scale model method, can cost-effectively obtain this prismatical joint
The REV sizes of rock mass.
In conjunction with the embodiments and accompanying drawing is specifically described for the present invention, comprise the following steps：
1) characteristic of the prismatical joint rock mass at scene is described, obtains this live prismatical joint characteristic information,
Wherein, characteristic information includes post draw ratio, different cross section shape and average side length.
2) scale model of indoor column jointed rock mass is determined using the theory of similarity, including the concrete of model rock mass
Strength grade, the size of concrete post, and the cementing material that each concrete post gluing is got up intensity.Its
In, scale model is according to the theory of similarity by the use of cement mortar material as model experiment material.
It is 52.5R that cement mortar grade is used in the present embodiment, and the proportioning of cast material is：Cement：Sand：Water=1：
0.4：0.45.
3) prismatical joint duckpin is made using the cast material for determining, then pillar is cementing, and conserved.This
In embodiment, pillar shape is regular hexagon, and the length of side is 5mm, and column length is 50mm, and post draw ratio is 10.
Columnar joint structure is be common in a kind of in slag in rule or irregular columnar shape primary
Property fractural structure, be more common in basalt, prismatical joint rock mass generally in four in body, five body, hexahedron, typically mutually it is embedding
It is combined, but average side length number is hexagon, therefore by the use of regular hexagon as the cross sectional shape of prismatical joint rock mass.
4) the prismatical joint strata model that will be cemented carries out different size processing cutting, wherein, different size is typically wrapped
Include：50mm*50mm*50mm, 70mm*70mm*70mm, 90mm*90mm*90mm, 110mm*110mm*110mm, 130mm*
130mm*130mm, 150mm*150mm*150mm.
It is 150mm*150mm*150mm to use size in the present embodiment.
5) by step 4) in the sample for processing carry out interior uniaxial compression test research.
6) by step 5) in data processed, obtain the feature unit body REV sizes of this prismatical joint rock mass, from
And can further carry out studying the mechanical characteristic of prismatical joint rock mass, seepage characteristic and rheological behavior.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvement and deformation can also be made, these improve and deform
Also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of method that utilization scale model determines prismatical joint rock mass characteristics cell cube REV, it is characterized in that, including following step
Suddenly：
1) characteristic of the prismatical joint rock mass at scene is described, obtains this live prismatical joint characteristic information；
2) scale model is determined, including：The strength grade of the concrete of model rock mass, the size of concrete post,
And the intensity of the cementing material that each concrete post gluing is got up；
3) prismatical joint duckpin is made using the cast material for determining, then pillar is cementing, and conserved；
4) the prismatical joint strata model that will be cemented carries out different size processing cutting；
5) by step 4) in the sample for processing carry out interior uniaxial compression test research；
6) by step 5) in data processed, obtain the feature unit body REV sizes of this prismatical joint rock mass.
2. the method that a kind of utilization scale model according to claim 1 determines prismatical joint rock mass characteristics cell cube REV,
It is characterized in that, the step 1) in characteristic information include post draw ratio, different cross section shape and average side length.
3. the method that a kind of utilization scale model according to claim 1 determines prismatical joint rock mass characteristics cell cube REV,
It is characterized in that, the step 2) in scale model according to the theory of similarity by the use of cement mortar material as model experiment material.
4. the method that a kind of utilization scale model according to claim 1 determines prismatical joint rock mass characteristics cell cube REV,
It is characterized in that, the step 3) in the model of duckpin use regular hexagon.
5. the method that a kind of utilization scale model according to claim 4 determines prismatical joint rock mass characteristics cell cube REV,
It is characterized in that, the length of side of the regular hexagon is 5mm.
6. the method that a kind of utilization scale model according to claim 1 determines prismatical joint rock mass characteristics cell cube REV,
It is characterized in that, the step 4) in different size include：50mm*50mm*50mm, 70mm*70mm*70mm, 90mm*90mm*
90mm, 110mm*110mm*110mm, 130mm*130mm*130mm, 150mm*150mm*150mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710096101.7A CN106706393A (en) | 2017-02-22 | 2017-02-22 | Method for determining representative elementary volume (REV) of columnar jointed rock mass through similarity model |
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| CN201710096101.7A CN106706393A (en) | 2017-02-22 | 2017-02-22 | Method for determining representative elementary volume (REV) of columnar jointed rock mass through similarity model |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271276A (en) * | 2017-05-27 | 2017-10-20 | 河海大学 | A kind of test method of determination prismatical joint rock mass stress and failure mechanism |
| CN112067637A (en) * | 2020-09-11 | 2020-12-11 | 中国矿业大学 | Rock-soil digital REV scale approximation criterion and sampling verification method |
Citations (5)
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|---|---|---|---|---|
| CN104596822A (en) * | 2015-02-05 | 2015-05-06 | 河海大学 | Preparation method of experimental model of in-situ columnar joint rock |
| CN105424430A (en) * | 2015-11-05 | 2016-03-23 | 河海大学 | Manufacturing method of cemented soil and stone mixed sample |
| CN105486555A (en) * | 2015-11-20 | 2016-04-13 | 河海大学 | Method for preparing columnar jointed rock mass model containing blind joints and interlayer shear belts |
| CN105654482A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Digital image technology-based soil-rock mixture representative element volume size determining method |
| CN105651964A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Method for determining representative elementary volume (REV) of jointed rock mass |
-
2017
- 2017-02-22 CN CN201710096101.7A patent/CN106706393A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596822A (en) * | 2015-02-05 | 2015-05-06 | 河海大学 | Preparation method of experimental model of in-situ columnar joint rock |
| CN105424430A (en) * | 2015-11-05 | 2016-03-23 | 河海大学 | Manufacturing method of cemented soil and stone mixed sample |
| CN105486555A (en) * | 2015-11-20 | 2016-04-13 | 河海大学 | Method for preparing columnar jointed rock mass model containing blind joints and interlayer shear belts |
| CN105654482A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Digital image technology-based soil-rock mixture representative element volume size determining method |
| CN105651964A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Method for determining representative elementary volume (REV) of jointed rock mass |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271276A (en) * | 2017-05-27 | 2017-10-20 | 河海大学 | A kind of test method of determination prismatical joint rock mass stress and failure mechanism |
| CN112067637A (en) * | 2020-09-11 | 2020-12-11 | 中国矿业大学 | Rock-soil digital REV scale approximation criterion and sampling verification method |
| CN112067637B (en) * | 2020-09-11 | 2021-07-13 | 中国矿业大学 | Rock-soil digital REV scale approximation criterion and sampling verification method |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170524 |
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