CN109991097A - Rock Loading ami deloading response ratio based on damage strength plays height method of discrimination - Google Patents
Rock Loading ami deloading response ratio based on damage strength plays height method of discrimination Download PDFInfo
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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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
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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Abstract
The invention discloses a kind of, and the rock Loading ami deloading response ratio based on damage strength plays height method of discrimination, and sillar is first processed into cylindrical type sample, carries out uniaxial compressive strength σ of the axial stress peak value as rock sample that rock sample is measured in uniaxial compression testc；The sample for taking a same size, utilizes σcUniaxial compression classification plus unloading test are carried out to it, obtain axial strain and lateral strain；Axial stress-axial strain curve is drawn, at different levels plus unloading test plus unloading peak point is determined, and calculate at different levels plus unloading test Loading ami deloading response ratio according to this, draws Loading ami deloading response ratio-axial strain curve；The corresponding axial strain of same axial stress and lateral strain are summed to obtain bulk strain, it draws axial stress-bulk strain curve and determines its inflection point, the corresponding axial stress of inflection point is damage strength, and damage strength is recycled to determine that Loading ami deloading response ratio plays height.Solve the problems, such as that Rock Under Uniaxial Compression has compressed height identification inaccuracy and caused safety accident.
Description
This application claims on 2 2nd, 2019 submission Patent Office of the People's Republic of China, application No. is 201910108065.0 application titles
For the priority of the Chinese patent application of " a kind of the rock Loading ami deloading response ratio based on damage strength rise height method of discrimination ",
Full content is hereby incorporated by reference in the application.
Technical field
The invention belongs to rock damage and failure discrimination technology fields, add more particularly to a kind of rock based on damage strength
Unloading response is compared with height method of discrimination.
Background technique
Loading ami deloading response ratio (Load-Unload Response Ratio, LURR) theory is a kind of study of rocks or rock mass
Nonlinear damage omen and the theory for destroying forecast.Currently, concrete-cored DCM pile is in nonlinear systems such as earthquake, landslides
A series of progress are achieved in unstability prediction.For rock sample compression damage problem, with the raising of loading force, when being loaded into
When later stage (loading force is greater than 60% peak strength), sample can occur from elastic deformation stage to crack and extension phase turns
Change, after rock sample internal injury accumulates to a certain extent, rock sample enters crack instability development until collapse stage.
When rock sample is in elastic deformation stage, invertibity is the essential characteristic of flexible deformation, loaded segment deformation modulus and is unloaded
It is identical to carry section deformation modulus, rock sample enters crack instability development until after collapse stage, and the deformation of rock sample has
Irreversibility, loaded segment deformation modulus are less than deformation modulus when unloading, and this differential disply mechanical properties of rock starts
The trend of deterioration, this trend very regular can be reflected in rock Loading ami deloading response ratio numerically, be embodied in
The raising of loading force, Loading ami deloading response ratio can step up increase, how to judge this ascendant trend starting point become most close
The problem of key.
The starting point that stepping up occurs in Loading ami deloading response ratio is defined as Loading ami deloading response ratio and plays height, and rock reaches crack
Until after failure stage, rock interior crack starts to penetrate through instability development, and Loading ami deloading response ratio starts to occur on step by step at this time
The phenomenon that rising.Loading ami deloading response ratio plays the starting point that height is the crack instability development stage, at this time along principal stress side inside sample
To opening crackle gradually penetrated through, gross fracture face will be given birth to inside rock sample, implies the overall collapse of rock sample.It determines plus unloads
The judgment method that response is carried compared with height can more accurately analyze rock damage development process in adding uninstall process, while can also
It makes prediction to the overall collapse of rock.
Summary of the invention
The purpose of the present invention is to provide a kind of, and the rock Loading ami deloading response ratio based on damage strength plays height method of discrimination,
To solve the problems, such as to accurately identify in determining damage of rock intensity, Rock Under Uniaxial Compression has compressed height and Rock Under Uniaxial Compression has compressed change
The problem of point identification inaccuracy causes safety accident.
The technical scheme adopted by the invention is that the rock Loading ami deloading response ratio based on damage strength plays height differentiation side
Method, the specific steps are as follows:
Step S1, the sillar of acquirement is processed into multiple cylindrical type samples by field sampling；
Step S2, uniaxial compression test is carried out, one cylindrical sample of load measures rock sample until rock sample destruction
Axial stress peak value, as the uniaxial compressive strength σ of rock samplec；
Step S3, the cylindrical sample for taking a same size again utilizes uniaxial compressive strength σcUniaxial compression is carried out to it
Classification plus unloading test, obtain the axial strain and lateral strain of rock sample；
Step S4, axial stress-axial strain curve of rock sample is drawn, and determines at different levels plus unloading test plus unloads
Carry peak point；
Step S5, it according at different levels plus unloading test plus unloading peak point, calculates at different levels plus unloading test plus unloading and rings
It should compare, and draw Loading ami deloading response ratio-axial strain curve；
Step S6, the volume for summing to obtain rock sample to the corresponding axial strain of same axial stress and lateral strain is answered
Become, draws axial stress-bulk strain curve of rock sample；
Step S7, axial stress-bulk strain point of inflexion on a curve, axial stress-bulk strain point of inflexion on a curve pair are determined
The axial stress answered is the damage strength of rock；
Step S8, determine that Loading ami deloading response ratio plays height using damage of rock intensity.
Further, the uniaxial compression classification of the step S3 plus unloading test, are loaded onto uniaxial compressive strength σ firstc
4%, 0 is then unloaded to, as the 1st grade of load；Then it is loaded onto uniaxial compressive strength σc8%, be offloaded to uniaxial compressive
Intensity σc4%, as the 2nd grade of load；Every grade of rate of loading increases uniaxial compressive strength σ compared with previous stagec4%, every grade unloading
Intensity is the rate of loading of previous stage, and step by step plus unloading is until rock sample destroys.
Further, the step S4 is at different levels plus adding for unloading test unloads peak point, is the axial stress-of rock sample
Axial stress peak points at different levels plus unloading test in axial strain curve.
Further, the Loading ami deloading response ratios that at different levels plus unloading test is calculated in the step S5 are first at different levels plus unload
Load peak point is the upper limit, and the loaded segment and unloading segment thereafter at every grade plus before unloading peak point take the data of certain length respectively
Then point fits slope, the unloading number of segment of at different levels plus unloading test loaded segment data point using least square fitting method
The ratio of the slope at strong point, the slope and the slope of its loaded segment data point of the unloading segment data point of every grade plus unloading test is
At different levels plus unloading test Loading ami deloading response ratio.
Further, the axial stress of the step S7-bulk strain point of inflexion on a curve is the axial stress-of rock sample
Bulk strain peak point in bulk strain curve in bulk strain curve.
Further, detailed process is as follows by the step S8: first passing through damage of rock intensity, determines damage strength in rock
Corresponding axial strain in axial stress-axial strain curve of stone sample, axial stress-of the damage strength in rock sample
Corresponding axial strain in axial strain curve, the corresponding Loading ami deloading response ratio in Loading ami deloading response ratio-axial strain curve
Point is that the Loading ami deloading response ratio of rock sample plays height.
Further, the uniaxial compression classification in the uniaxial compression test and step S3 in the step S2 plus unloading test
It is carried out on electro-hydraulic servo testing machine, and loading speed is 12KN/min.
Further, the cylindrical sample diameter of the step S1 is 48~52mm, length is diameter 1.8~2.2 times
The invention has the advantages that determining that the damage of rock is strong by rock axial stress-bulk strain inflection point first
Degree determines that Loading ami deloading response ratio plays intensity adjustable by damage strength, and Loading ami deloading response ratio intensity adjustable is corresponding plus unloading point is
Height is played for Loading ami deloading response ratio, during rock is loaded, the appearance that Loading ami deloading response ratio plays height implies that rock sample will
Unstable failure occurs, by this method can accurate judgement rock Loading ami deloading response ratio play height, and then the rock failure mechanism of rock is made and is mentioned
Preceding early warning, the safety of personnel and testing equipment during protection test effectively solve accurately to know in determining damage of rock intensity
The problem of other Rock Under Uniaxial Compression has compressed height and Rock Under Uniaxial Compression have compressed the problem of height identification inaccuracy causes safety accident.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow diagram of the method for the invention；
Fig. 2 is cylindrical type sample stereoscopic schematic diagram；
Fig. 3 is rock sample classification plus unloading scheme schematic diagram；
Fig. 4 is Loading ami deloading response ratio least square fitting method schematic diagram；
Fig. 5 is the change curve according to the calculated Loading ami deloading response ratio of least square fitting method with axial strain；
Fig. 6 is to determine that the Loading ami deloading response ratio of rock plays height according to axial stress-bulk strain knee of curve；
Fig. 7 is to play intensity adjustable relational graph according to what damage strength and differential technique determined.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Rock Under Uniaxial Compression compression classification plus unloading test are carried out in MTS815 electro-hydraulic servo testing machine, adding for rock is unloaded
Response is carried to be judged compared with height.
As shown in Figure 1, the rock Loading ami deloading response ratio based on damage strength plays height method of discrimination, detailed process is as follows:
(1) sillar of acquirement is processed into cylindrical type sample by field sampling, and diameter D is taken as 48-52mm, the length L of sample
1.8~2.2 times of diameter are taken, as shown in Figure 2.Test should follow these steps to carry out:
(2) according to rock mechanics uniaxial compression test regulation, 1 cylindrical rock sample is taken to be placed in rigid electro-hydraulic servo
On control of material testing machine, with the power control loading speed load of 12KN/min until rock sample destroys, obtains its stress and answer
Varied curve, using the peak value of the axial stress of rock sample as its uniaxial compressive strength σc。
(3) the cylindrical type rock sample of 1 same size is taken again, and rock is carried out with identical power control loading speed
Classification plus unloading test, add unloading scheme referring to Fig. 3, are loaded onto uniaxial compressive strength σ firstc4%, be then unloaded to 0, this
Secondary load is used as the 1st grade of load, is then loaded onto the 8% of uniaxial compressive strength again, is offloaded to 4%, as the 2nd grade of load；
It reloads to 12%, is offloaded to 8%, as 3rd level load, and so on, step by step plus unloading is until rock sample destroys, and obtains
The axial strain and lateral strain of rock sample.
(4) obtain rock sample classification add unloading stress-strain diagram after, it is each plus unloading peak point before and after plus
In the axial stress for carrying section and unloading segment, 1MPa data is respectively taken to calculate using least square fitting method separately down from peak stress
Loading ami deloading response ratio out.Concrete operations are respectively to take 1MPa number in loaded segment and unloading segment using at different levels plus unloading peak point as the upper limit
According to the slope of loaded segment and the slope of unloading segment being fitted respectively according to least square fitting method, as shown in figure 4, plus unloading segment
Response rate is the inverse of its slope, and Loading ami deloading response ratios at different levels are the ratio of loaded segment and unloading segment response rate.
(5) rock sample is calculated in Loading ami deloading response ratios at different levels plus unloading point, obtains Loading ami deloading response ratio with axial direction
The change curve of strain obtains the bulk strain of rock referring to Fig. 5, while by the sum of axial strain and lateral strain.
(6) such as Fig. 6, the axial stress-axial strain for making the axial stress-bulk strain curve and rock of rock is bent
Line, axial stress-bulk strain knee of curve position are the damage strength of rock, and Loading ami deloading response ratio plays intensity adjustable and rock
Damage strength it is identical, Loading ami deloading response ratio rise the corresponding the same level of intensity adjustable add unloading point be Loading ami deloading response ratio rise height.
Embodiment 1:
By taking green sandstone as an example, the bulk strain of rock is first calculated, damage is then determined according to axial stress-bulk strain inflection point
Hurt intensity, judges that the Loading ami deloading response ratio of green sandstone plays height further according to damage strength, specific as follows:
Step1: it is 50mm that the sillar that engineering site is fetched, which is processed into diameter, and the cylindrical rock that length is 100mm tries
Sample takes the rock sample of 1 same size to carry out uniaxial compression test in MTS815 electro-hydraulic servo testing machine, to load speed
The power that rate is 12KN/min controls loading method load, and the peak value of the axial stress of rock sample is 80.1MPa, therefore green sandstone examination
The uniaxial compressive strength σ of samplec=80.10MPa.
Step2: according to the uniaxial compressive strength σ obtained in step1cValue, determine level-one load be 3.2MPa, second level,
Three-level load is 6.4MPa, 9.6MPa, and every grade of loading ratio upper level load increases 3.2MPa, adds unloading step by step until rock in this way
Sample destroys.
Step3: taking the rock sample of 1 same size, is named as green sandstone K1, carries out uniaxial compression point to green sandstone K1
Grade plus unloading test are loaded onto rock sample with the power control loading speed of 12KN/min and destroy, add unloading manner such as Fig. 3, first
First it is loaded onto uniaxial compressive strength σc4%, be then unloaded to 0, this load be used as the 1st grade of load, be then loaded onto again
The 8% of uniaxial compressive strength, is offloaded to 4%, as the 2nd grade of load；It reloads to 12%, 8% is offloaded to, as 3rd level lotus
It carries, and so on, step by step plus unloading is until rock sample destruction, obtains the axial strain and lateral strain of rock sample.
Step4: determining each plus unloading peak point position to the analysis of axial stress strain curve obtained in step3,
In the axial stress of loaded segment and unloading segment before and after each plus unloading peak point, respectively taken separately down from peak stress
1MPa data calculate Loading ami deloading response ratio using least square fitting method.Concrete operations be with it is at different levels plus unloading peak point be on
Limit, respectively takes 1MPa data in loaded segment and unloading segment, fits the slope of loaded segment respectively according to least square fitting method and unloads
Carry the slope of section.
The slope of loaded segment and unloading segment is obtained in step5:step4, the response rate of loaded segments and unloading segment at different levels is
The inverse of loaded segment and unloading slope over 10, it is at different levels to add the response rate and unloading for unloading the Loading ami deloading response ratios of peak point by loaded segment
The response rate ratio calculation of section obtains.
Step6: it determines that Loading ami deloading response ratio plays height according to damage strength: being obtained by the sum of axial strain and lateral strain
To the bulk strain of rock, axial stress-bulk strain curve of rock sample, axial stress-bulk strain curve are analyzed
The corresponding axial stress of inflection point is the damage strength of rock, and it is rock that Loading ami deloading response ratio, which plays the corresponding axial stress of height,
Intensity adjustable is played, using bulk strain as horizontal axis, axial stress is the longitudinal axis, green sandstone K1 axial stress-bulk strain knee of curve
Coordinate is (0.0029,66.66), and the damage strength of green sandstone K1 is 66.66MPa, and rock plays intensity adjustable and damage strength phase
Together, determine that Loading ami deloading response ratio plays intensity adjustable using damage of rock intensity, then Loading ami deloading response ratio plays intensity adjustable corresponding
Grade plus unloading point are that Loading ami deloading response ratio plays height.It is according to the intensity adjustable that rises of the determining green sandstone K1 of damage strength
66.66MPa, Loading ami deloading response ratio height is corresponding plus unloading series is 21.
What 1 damage strength method of table and differential technique determined plays intensity adjustable
| Rock sample number | Intensity adjustable/MPa is played according to what damage strength determined | Loading ami deloading response ratio height is corresponding plus unloads series |
| K1 | 66.66 | 21 |
In addition, the definition that Loading ami deloading response ratio plays height is that Loading ami deloading response ratio the starting point stepped up occurs, according to
Definition has determined height method are as follows: the difference for remembering adjacent two-stage Loading ami deloading response ratio is Δ LURR, Δ LURRι=LURRι-
LURRι-1(ι >=2), Δ LURR in formulaιFor i-stage plus the corresponding Loading ami deloading response ratio difference of unloading test, LURRιFor i-stage plus
Unload response ratio, LURRι-1For (i-1)-th grade of Loading ami deloading response ratio.Corresponding Δ after investigation 60% peak strength of rock sample
LURR value shows that rock Loading ami deloading response ratio occurs stepping up phenomenon if three continuous Δ LURR values are positive, it is determined that
The corresponding previous stage of first Δ LURR in these three continuous Δ LURR adds the peak point of unloading test to be height, this
Determine that the method that Loading ami deloading response ratio plays height is Loading ami deloading response ratio differential technique according to defining.
20 kinds of rocks of table play intensity adjustable according to what damage strength and differential technique determined
Shaoyang fiber crops granite, microgranite, yellow rust stone granite, red sand are calculated according to damage strength method and differential technique
Rock, black sand rock, green sandstone, limestone, the white griotte in Leiyang, coarse marble, rising for 10 kinds of rock materials of Guangxi White griotte become
Point and intensity adjustable.Such as table 2, the Loading ami deloading response ratio determined according to damage strength and differential technique of 10 kinds of rock materials is listed
Intensity adjustable is played, the accuracy of height judgment method, every kind of rock material are played for Loading ami deloading response ratio of the verifying based on damage strength
Three rock samples are all taken to be tested according to the method described above.Fig. 7 gives that ten kinds of rocks are determined according to above two method plus unloads
Response is carried compared with height fit correlation figure, wherein horizontal axis P2For the Loading ami deloading response ratio determined according to Loading ami deloading response ratio differential technique
Play height, longitudinal axis P1Loading ami deloading response ratio to be determined according to damage strength plays intensity adjustable, and two methods determine plus unloading is rung
It should be P compared with intensity adjustable matched curve function1=0.99P2+ 0.31, the intensity adjustable that rises for showing that two methods determine is consistent,
It is accurate feasible that also the damage strength of explanation rock, which determines that the Loading ami deloading response ratio of rock plays height, simultaneously.
Height is played using the Loading ami deloading response ratio that Loading ami deloading response ratio differential technique determines to determine with by damage of rock intensity
Loading ami deloading response ratio plays height and is consistent, and determines that Loading ami deloading response ratio plays height method it needs to be determined that continuous three according to differential technique
A to be positive, the Loading ami deloading response ratio based on damage strength plays the axial stress-that height judgment method only needs to detect rock sample
Bulk strain point of inflexion on a curve can determine that Loading ami deloading response ratio plays height, more quick accurate.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, it should be understood by those ordinary skilled in the art that: still can be to of the invention specific
Embodiment is modified or replaced equivalently, and without departing from any modification of spirit and scope of the invention or equivalent replacement,
It is intended to be within the scope of the claims of the invention.
Claims (8)
1. the rock Loading ami deloading response ratio based on damage strength plays height method of discrimination, which is characterized in that specific step is as follows:
Step S1, the sillar of acquirement is processed into multiple cylindrical type samples by field sampling；
Step S2, uniaxial compression test is carried out, one cylindrical sample of load measures the axis of rock sample until rock sample destruction
To peak stress, as the uniaxial compressive strength σ of rock samplec；
Step S3, the cylindrical sample for taking a same size again utilizes uniaxial compressive strength σcUniaxial compression classification is carried out to it to add
Unloading test obtains the axial strain and lateral strain of rock sample；
Step S4, axial stress-axial strain curve of rock sample is drawn, and determines at different levels plus unloading test plus unloading peak
Value point；
Step S5, according at different levels plus unloading test plus unloading peak point, at different levels plus unloading test Loading ami deloading response ratio is calculated,
And draw Loading ami deloading response ratio-axial strain curve；
Step S6, the corresponding axial strain of same axial stress and lateral strain are summed to obtain the bulk strain of rock sample,
Draw axial stress-bulk strain curve of rock sample；
Step S7, determine that axial stress-bulk strain point of inflexion on a curve, axial stress-bulk strain point of inflexion on a curve are corresponding
Axial stress is the damage strength of rock；
Step S8, determine that Loading ami deloading response ratio plays height using damage of rock intensity.
2. the rock Loading ami deloading response ratio according to claim 1 based on damage strength plays height method of discrimination, feature
It is, the uniaxial compression classification of the step S3 plus unloading test are loaded onto uniaxial compressive strength σ firstc4%, then unload
It is downloaded to 0, as the 1st grade of load；Then it is loaded onto uniaxial compressive strength σc8%, be offloaded to uniaxial compressive strength σc4%, make
For the 2nd grade of load；Every grade of rate of loading increases uniaxial compressive strength σ compared with previous stagec4%, every grade of unloading strength is previous stage
Rate of loading, step by step plus unloading until rock sample destroy.
3. the rock Loading ami deloading response ratio according to claim 1 based on damage strength plays height method of discrimination, feature
It is, it is axial stress-axial strain curve of rock sample that the step S4 is at different levels plus adding for unloading test unloads peak point
In at different levels plus unloading test axial stress peak points.
4. described in any item rock Loading ami deloading response ratios based on damage strength play height differentiation side according to claim 1~3
Method, which is characterized in that calculate at different levels plus unloading test Loading ami deloading response ratio in the step S5, be first at different levels plus unloading peak
Value point is the upper limit, and the loaded segment and unloading segment thereafter at every grade plus before unloading peak point take the data point of certain length respectively,
Then slope, the unloading segment data point of at different levels plus unloading test loaded segment data point are fitted using least square fitting method
Slope, the ratio of the slope and the slope of its loaded segment data point of the unloading segment data point of every grade plus unloading test is as at different levels
Add the Loading ami deloading response ratio of unloading test.
5. the rock Loading ami deloading response ratio according to claim 4 based on damage strength plays height method of discrimination, feature
It is, axial stress-bulk strain point of inflexion on a curve of the step S7 is axial stress-bulk strain curve of rock sample
Bulk strain peak point in middle bulk strain curve.
6. the rock Loading ami deloading response ratio according to claim 4 based on damage strength plays height method of discrimination, feature
It is, detailed process is as follows by the step S8: first passes through damage of rock intensity, determines damage strength in the axial direction of rock sample
Corresponding axial strain in stress-axial strain curve, axial stress-axial strain curve of the damage strength in rock sample
In corresponding axial strain, in Loading ami deloading response ratio-axial strain curve corresponding Loading ami deloading response ratio point be rock examination
The Loading ami deloading response ratio of sample plays height.
7. according to claim 1, the rock Loading ami deloading response ratio described in 2,3,5 or 6 based on damage strength plays height differentiation side
Method, which is characterized in that the uniaxial compression classification plus unloading test in the uniaxial compression test and step S3 in the step S2 are equal
It is carried out on electro-hydraulic servo testing machine, and loading speed is 12KN/min.
8. according to claim 1, the rock Loading ami deloading response ratio described in 2,3,5 or 6 based on damage strength plays height differentiation side
Method, which is characterized in that the cylindrical sample diameter of the step S1 is 48~52mm, length is diameter 1.8~2.2 times.
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| CN2019101080650 | 2019-02-02 | ||
| CN201910108065.0A CN109781540A (en) | 2019-02-02 | 2019-02-02 | A kind of rock Loading ami deloading response ratio based on damage strength height method of discrimination |
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| CN109991097A true CN109991097A (en) | 2019-07-09 |
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| CN201910430756.2A Active CN109991097B (en) | 2019-02-02 | 2019-05-22 | Rock loading and unloading response ratio change point judging method based on damage strength |
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| CN109781540A (en) | 2019-05-21 |
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