CN106404487A - Rock test sample for rock shearing strength test and testing method thereof - Google Patents
Rock test sample for rock shearing strength test and testing method thereof Download PDFInfo
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- CN106404487A CN106404487A CN201610876929.XA CN201610876929A CN106404487A CN 106404487 A CN106404487 A CN 106404487A CN 201610876929 A CN201610876929 A CN 201610876929A CN 106404487 A CN106404487 A CN 106404487A
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a rock test sample for rock shearing strength test. A body of the rock test sample is a hollow cylinder; a coaxial cylindrical hole is processed in the center of the hollow cylinder; a beveling groove which surrounds the outer cylindrical surface for one circle and has the same structure is processed in the outer cylindrical surface of the hollow cylinder; the section passing through the beveling groove and the section perpendicular to the central axial line of the hollow cylinder form an inclined angle theta of 30 to 70 degrees; and the center point of the section passing through the beveling groove is superposed with the center point of the central axial line of the hollow cylinder. The invention also provides a method for testing the rock shearing strength based on the hollow cylinder rock test sample with the annular beveling groove. The rock test sample is simple and convenient to process, has low requirements on test equipment and can guarantee that stress is distributed uniformly. The rock is subjected to shear failure in the direction of the beveling groove in the compression process, and the shearing strength of the rock can be obtained by the rock test sample quickly, simply and accurately.
Description
Technical field
The invention belongs to rock material technical field of performance test, particularly to a kind of for testing shear of rock intensity
Rock sample and the shear strength method of testing based on this sample.
Technical background
The shearing strength of rock refers to that rock resists the ability of failure by shear.In Practical Project, rock is generally in multiple
Miscellaneous stress, the destruction of engineering rock mass is frequently not simple crushing and drawing crack, and it occur frequently that macroscopical failure by shear.Cause
This, the shearing strength of study of rocks and its method of testing have important theory value and engineering application value.Measure rock at present
Stone material shear behavior mainly adopts direct shear test, wedge shape shearing test and triaxial test.Direct shear test is mainly excellent
Point is simple and convenient it is not necessary to special installation, and same sample can reuse, and improve stock utilization, but sample is cut face
Stress distribution on long-pending is uneven, if added horizontal force deviates shear surface, can cause moment of flexure, lead to result of the test error relatively
Greatly.Wedge shape shearing test requirements document sample is cubic form, carries out shear test using wedge shape shearing instrument.The method can obtain
Value of shearing under different normal stress effects, and then obtain internal friction angle and cohesion force value.But the processing to sample for the method
Require higher, if cuboid sample processing is not accurate, that is, cubical in irregular shape, then can cause shear surface upper stress
, there is stress concentration in skewness, cause sample not destroy along predetermined shear surface, does not reach shearing test and requires.Three axles
Test is the test preferable method of shear of rock intensity, but apparatus expensive, and the testing time is long, and the popularization of therefore the method is limited
System.
Content of the invention
For the deficiencies in the prior art, first purpose of the present invention is to provide a kind of new cutting for testing shear of rock
The hollow cylinder rock sample with circular slanting grooving of intensity, the processing of this sample is simple and convenient, testing equipment is required low, and
Can guarantee that stress distribution uniformly, in rock pressurized process, along groove direction of cutting sth. askew, failure by shear, second invention of the present invention occur
Purpose is to provide the side carrying out shear of rock shearing stress test using the above-mentioned hollow cylinder rock sample with circular slanting grooving
Method, with shear strength that is quick, simple, being accurately obtained rock.
For first goal of the invention of the present invention, centered on the body of described rock sample, it is machined with coaxial circles post holes
Hollow cylinder, is machined with hollow cylinder external cylindrical surface around one week isostructural groove of cutting sth. askew of external cylindrical surface, crosses groove of cutting sth. askew
Section becomes 30 °～70 ° tiltangleθs with the section of vertical hollow cylindrical center axis, cross the kernel of section point of groove of cutting sth. askew with hollow
Cylindrical center's axis midpoint overlaps.
The above-mentioned rock sample for shear of rock strength test, it is rectangular cross section that described groove of cutting sth. askew is preferably cross section
Groove of cutting sth. askew.
The above-mentioned rock sample for shear of rock strength test, slant height h preferred hollow cylinder pillar height H of described groove of cutting sth. askew
0.15～0.25 times.
The above-mentioned rock sample for shear of rock strength test, depth t of described circular slanting grooving is preferably open circles
0.05～0.15 times of post outer diameter D.
The above-mentioned rock sample for shear of rock strength test, the height H of described hollow cylinder is excellent with the ratio of outer diameter D
Elect 2 as:1.
The above-mentioned rock sample for shear of rock strength test, the internal diameter ψ of described hollow cylinder is preferably outer diameter D
0.2～0.5 times.External diameter is preferably 50～100mm in fact it is highly preferred that being 100～200mm.
For second object of the present invention, the present invention provides the side testing shear of rock intensity using above-mentioned rock sample
Method, including step as follows：
(1) with the angle of groove inclination θ that cuts sth. askew for different values, it is strong that remaining equivalently-sized multiple rock sample is used as shear of rock
Degree test；
(2) take a rock sample to be placed on conventional rock test rig, then load along sample axis direction, until examination
Sample destroys, and records failing load；
(3) according to the method for step (2), obtain differing tilt angles and cut sth. askew the failing load of groove rock sample, by formula (a)
(b) calculate the normal stress σ perpendicular to the shear plane and shear stress τ parallel to shear plane when sample destroys, draw σ～τ
Curve, thus obtaining index internal friction angle and the cohesiveness of shear of rock shearing stress,
In formula：σ is normal stress, and τ is shear stress, PτFor failing load, θ is to cut sth. askew the angle of inclination of groove.
In said method, loading speed is preferably 0.5～1MPa/s.
In said method, the quantity of the rock sample surveyed as shear of rock intensity is no less than 5, angle of groove inclination degree of cutting sth. askew
The difference of the angle of groove inclination degree of cutting sth. askew of the adjacent rock sample of value is not more than 10 °.
In said method, formula (a) and formula (b) are got by following derivation：
The part as shown in Fig. 4 is taken to be object of study, when sample reaches critical load PτWhen, according to equilibrium condition, can
To obtain following two formulas：
N-PτCos θ=0 (1)
Q-PτSin θ=0 (2)
In formula：PτFor failing load (N), N is the normal direction gross pressure (N) acting on shear surface, and Q is to act on shear surface
On tangentially total shearing (N), θ is the angle of inclination of circular slanting grooving.
N and Q is tried to achieve by formula (1) and (2), then is respectively divided by the section of shear, obtain final product：
In examination, A is the section of shear (mm2), A can be calculated by formula (5)：
Substitution formula (3) and formula (4) obtain final product：
Rock sample for shear of rock strength test of the present invention can be processed by the following method：
Drill through hollow cylinder core with rock corning machine first, then with lathe, core is cut into the hollow of desired height
Cylinder, the blade being finally 2mm with thickness, cuts the circular slanting grooving at desired depth and angle of inclination in cylindrical side.
Compared with prior art, the invention has the advantages that：
1. the present invention provides a kind of new rock sample and method for the test of the shear strength of rock.
2. rock sample processing of the present invention is simple and convenient, low for equipment requirements, and can ensure that rock is pressed through
Failure by shear along the groove direction of cutting sth. askew in Cheng Zhongneng, it is to avoid the difficulty of cuboid sample preparation in wedge shape shearing test there is, and
During cuboid sample is cut, stress distribution in shear(ing) area is uneven, the deficiency of stress concentration.
3. utilize rock sample of the present invention, rock can be obtained by routine test device and shirtsleeve operation method
Shear Strength Index, that is, cohesiveness and internal friction angle, meet engine request.
4. rock sample of the present invention is due to having hollow-core construction, sample two ends and assay device bearing plate contact area
Reduce, the end effect producing because of the rubbing action between bearing plate and sample is also weakened, thus improving shear of rock
The measuring accuracy of intensity.
Brief description
Fig. 1 is the front view of the rock sample for shear of rock strength test of the present invention；
Fig. 2 is the top view of the rock sample for shear of rock strength test of the present invention；
Fig. 3 is A-A profile in Fig. 1；
Fig. 4 is the stress diagram of shear surface when loading.
Specific embodiment
And it is based on to the rock sample for shear of rock strength test of the present invention below by specific embodiment
The method of testing of the shear of rock shearing stress of this sample is described further.
Embodiment 1
It is used for the rock sample structure of shear of rock strength test as Figure 1-3, described rock sample in the present embodiment
Body centered on be machined with the hollow cylinder of coaxial circles post holes, hollow cylinder external cylindrical surface is machined with around external cylindrical surface
One week isostructural groove of cutting sth. askew, the section of groove of excessively cutting sth. askew becomes tiltangleθ with the section of vertical hollow cylindrical center axis, crosses and cuts sth. askew
The kernel of section point of groove is overlapped with hollow cylinder central axis midpoint O.Described groove of cutting sth. askew is the oblique of rectangular cross section for cross section
Grooving.
Cylinder height H is 100mm, and outer diameter D is 50mm, and internal diameter ψ is 20mm, and circular slanting grooving height is 2mm, and depth t is
5mm, tiltangleθ is respectively：30°、40°、45°、50°、55°、60°、65°.
Method of testing：
(1) drilling through external diameter with rock corning machine first is 50mm, and internal diameter is the hollow cylinder core of 20mm, then uses lathe
Core is cut into the hollow cylinder that height is 100mm, the blade being finally 2mm with thickness, in cylindrical side depth of cut is
5mm, angle of inclination is the circular slanting grooving of θ, obtains multiple rock samples at different circular slanting grooving inclinations angle；
(2) take a rock sample to be positioned over MTS, RMT-150 testing machine bearing plate center, adjust spheric seat, make test specimen
Uniformly (identical with Rock Under Uniaxial Compression test setting method), then along sample axis Vertical loading, loading speed is for both ends of the surface contact
1MPa/s, until sample destroys, records failing load；
(2) according to the method for step (2), obtain the failing load of differing tilt angles grooving test specimen, by formula (a) and (b)
Calculate the normal stress σ perpendicular to the shear plane and shear stress τ parallel to shear plane when sample destroys, draw τ～σ curve,
Thus trying to achieve index internal friction angle and the cohesiveness of shear of rock shearing stress.
In formula：σ is normal stress, and τ is shearing stress, PτFor failing load, θ is angle of groove inclination of cutting sth. askew.
Claims (10)
1. a kind of rock sample for shear of rock strength test is it is characterised in that add centered on the body of described rock sample
Work has the hollow cylinder of coaxial circles post holes, is machined with isostructural oblique around external cylindrical surface one week on hollow cylinder external cylindrical surface
Grooving, the section of groove of excessively cutting sth. askew becomes 30 °～70 ° tiltangleθs with the section of vertical hollow cylindrical center axis, crosses cutting of groove of cutting sth. askew
Face central point is overlapped with hollow cylinder central axis midpoint.
2. it is used for the rock sample of shear of rock strength test according to claim 1 it is characterised in that described groove of cutting sth. askew is
Cross section is the groove of cutting sth. askew of rectangular cross section.
3. it is used for the rock sample of shear of rock strength test according to claim 2 it is characterised in that described groove of cutting sth. askew
Slant height h is 0.15～0.25 times of hollow cylinder pillar height H.
4. it is used for the rock sample of shear of rock strength test according to claim 3 it is characterised in that described annular is cut sth. askew
Depth t of groove is 0.05～0.15 times of hollow cylinder outer diameter D.
5. it is used for the rock sample of shear of rock strength test according to one of Claims 1-4 it is characterised in that described sky
The height H of heart cylinder and the ratio of outer diameter D are 2:1.
6. it is used for the rock sample of shear of rock strength test according to one of Claims 1-4 it is characterised in that described sky
The internal diameter ψ of heart cylinder is 0.2～0.5 times of outer diameter D.
7. it is used for the rock sample of shear of rock strength test according to claim 5 it is characterised in that described hollow cylinder
Internal diameter ψ be 0.2～0.5 times of outer diameter D.
8. utilize the method that in claim 1～7, rock sample described in any claim tests shear of rock intensity, its feature
It is as follows including step：
(1) with the angle of groove inclination θ that cuts sth. askew for different values, remaining equivalently-sized multiple rock sample is used as shear of rock intensity and surveys
Examination；
(2) take a rock sample to be placed on conventional rock test rig, then load along sample axis direction, until sample breaks
Bad, record failing load；
(3) according to the method for step (2), obtain differing tilt angles and cut sth. askew the failing load of groove rock sample, by formula (a) and
B () calculates the normal stress σ perpendicular to the shear plane and shear stress τ parallel to shear plane when sample destroys, draw σ～τ bent
Line, thus obtaining index internal friction angle and the cohesiveness of shear of rock shearing stress,
In formula：σ is normal stress, and τ is shear stress, PτFor failing load, θ is to cut sth. askew the angle of inclination of groove.
9. test the method for shear of rock intensity according to claim 8 it is characterised in that the loading speed of step (2) is
0.5～1MPa/s.
10. test the method for shear of rock intensity according to claim 8 it is characterised in that being used as what shear of rock intensity was surveyed
The quantity of rock sample is no less than 5, the difference of the angle of groove inclination degree of cutting sth. askew of the adjacent rock sample of angle of groove inclination angle value of cutting sth. askew
It is not more than 10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610876929.XA CN106404487B (en) | 2016-10-08 | 2016-10-08 | Rock sample and its test method for shear of rock strength test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610876929.XA CN106404487B (en) | 2016-10-08 | 2016-10-08 | Rock sample and its test method for shear of rock strength test |
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| CN106404487B CN106404487B (en) | 2019-08-02 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884288A (en) * | 2017-12-18 | 2018-04-06 | 成都理工大学 | Rock compressed shearing sample making containing Among Intermittent Joints and test method under high temperature |
| CN108827796A (en) * | 2018-08-28 | 2018-11-16 | 中国石油大学(北京) | Measure the test device of rock shear strength and shearing crack Frictional Slipping characteristic |
| CN109900564A (en) * | 2019-03-25 | 2019-06-18 | 中国电建集团华东勘测设计研究院有限公司 | Inter-laminar dislocation band of growing up friction angle measuring method |
| CN109946136A (en) * | 2019-04-11 | 2019-06-28 | 中国人民解放军军事科学院国防工程研究院 | A kind of inclined clay sample cut mold of depositional plane and its operating method |
| CN112989586A (en) * | 2021-03-04 | 2021-06-18 | 四川大学 | Method for judging failure mode of reinforced concrete hollow pier stud |
| CN115163032A (en) * | 2022-09-07 | 2022-10-11 | 云南省交通投资建设集团有限公司 | Control system and method for deep drilling side wall coring intelligent drilling machine |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884288A (en) * | 2017-12-18 | 2018-04-06 | 成都理工大学 | Rock compressed shearing sample making containing Among Intermittent Joints and test method under high temperature |
| CN107884288B (en) * | 2017-12-18 | 2023-09-26 | 成都理工大学 | Manufacturing and testing method of rock compression shear sample containing intermittent joints at high temperature |
| CN108827796A (en) * | 2018-08-28 | 2018-11-16 | 中国石油大学(北京) | Measure the test device of rock shear strength and shearing crack Frictional Slipping characteristic |
| CN108827796B (en) * | 2018-08-28 | 2022-09-30 | 中国石油大学(北京) | Testing device for measuring rock shear strength and shear crack friction sliding characteristics |
| CN109900564A (en) * | 2019-03-25 | 2019-06-18 | 中国电建集团华东勘测设计研究院有限公司 | Inter-laminar dislocation band of growing up friction angle measuring method |
| CN109900564B (en) * | 2019-03-25 | 2021-09-28 | 中国电建集团华东勘测设计研究院有限公司 | Method for measuring friction angle of large interlaminar dislocation belt |
| CN109946136A (en) * | 2019-04-11 | 2019-06-28 | 中国人民解放军军事科学院国防工程研究院 | A kind of inclined clay sample cut mold of depositional plane and its operating method |
| CN109946136B (en) * | 2019-04-11 | 2024-06-11 | 中国人民解放军军事科学院国防工程研究院 | Clay sample cutting die with inclined deposition surface and operation method thereof |
| CN112989586A (en) * | 2021-03-04 | 2021-06-18 | 四川大学 | Method for judging failure mode of reinforced concrete hollow pier stud |
| CN112989586B (en) * | 2021-03-04 | 2022-09-23 | 四川大学 | Method for judging failure mode of reinforced concrete hollow pier stud |
| CN115163032A (en) * | 2022-09-07 | 2022-10-11 | 云南省交通投资建设集团有限公司 | Control system and method for deep drilling side wall coring intelligent drilling machine |
| CN115163032B (en) * | 2022-09-07 | 2022-11-25 | 云南省交通投资建设集团有限公司 | Control system and method for deep drilling side wall coring intelligent drilling machine |
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Inventor after: Xu Nuwen Inventor after: Shen Weigang Inventor after: Zhao Tao Inventor after: Dai Feng Inventor after: Wei Mingdong Inventor after: Liu Yi Inventor before: Dai Feng Inventor before: Shen Weigang Inventor before: Zhao Tao Inventor before: Xu Nuwen Inventor before: Wei Mingdong Inventor before: Liu Yi |
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Granted publication date: 20190802 Termination date: 20211008 |