CN110220787A - A kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment - Google Patents

A kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment Download PDF

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CN110220787A
CN110220787A CN201910600470.4A CN201910600470A CN110220787A CN 110220787 A CN110220787 A CN 110220787A CN 201910600470 A CN201910600470 A CN 201910600470A CN 110220787 A CN110220787 A CN 110220787A
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rock
test
under
pressure
confining
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杨宝全
陈媛
徐慧宁
陈建叶
董建华
张�林
刘建锋
罗敏
刘子安
张芮瑜
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Sichuan University
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Sichuan University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00Sampling; Preparing specimens for investigation
    • G01N1/28Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/286Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24Earth materials
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014Type of force applied
    • G01N2203/0016Tensile or compressive
    • G01N2203/0019Compressive
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003Generation of the force
    • G01N2203/0042Pneumatic or hydraulic means
    • G01N2203/0048Hydraulic means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/022Environment of the test
    • G01N2203/0236Other environments
    • G01N2203/0242With circulation of a fluid
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/025Geometry of the test
    • G01N2203/0256Triaxial, i.e. the forces being applied along three normal axes of the specimen

Abstract

The invention discloses a kind of load path methods of measurement crack rock test specimen water rock coupling weakened treatment, are related to mechanical behaviour of soil and rock test field, steps are as follows for test method: (1), testing sample preparation;(2), experiment process step is divided into: a. simulates the forming process test of crack rock;B. erosion, unloader test under river are simulated;C. native state dynamic characteristic test containing crack rock;D. test specimen saturation testing;E. reduction test of the crack rock under different hydraulic pressure, different confining pressures;(3), test data analyzer: obtaining the scatter plot of the axial stress σ 1 and 3 relationship of confining pressure σ under each crack rock native state and every level-one hydraulic pressure, while obtaining intensive parameter c value and f value of the crack rock under native state and under hydraulic pressure at different levels.The invention proposes a kind of new easy load path methods, to study weakened treatment of the dam body basement rock under water rock coupling, provide technical support to solve dam body long-time stability problem.

Description

A kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment
Technical field
The present invention relates to geographic information processing field, specially a kind of measurement crack rock test specimen water rock couples weakened treatment Load path method.
Background technique
Water is one of essential characteristic of rock soil medium, other than influencing the physicochemical properties and constitutive relation of medium, Migration generates dynamic, and hydrostatic pressure can change the stress state in medium;On the other hand, pressure stress state is relevant to medium Geometrical characteristic, the change of stress state can cause the change of the permeability tensor of medium, to influence the flowing of water, it can be seen that, There are close interaction relationships between stress and seepage flow: seepage effect pressure stress state, it influences medium again in turn Seepage flow characteristics, as water rock coupled problem.In the geotechnical engineering accident occurred both at home and abroad, quite a few is since water is in rock Seepage flow in soil-structure interactions lead to rock mass large area unstability and caused by.Therefore, the intensive parameter of crack rock is obtained, water rock is simulated Influence of the coupling reduction to structure, it is particularly significant to research dam body long-time stability.
China is gradually built up in the big library of each high dam, the coupling of seepage field and stress field that rock mass is formed after reservoir filling Under, certain weakened treatment can be generated, the stabilization of the dam foundation and dam abutment is produced a very large impact, the dam foundation is made in stress-seepage coupling Weakened treatment under becomes the another new problem of hydraulic engineering circle.At present still to the water rock coupling weakened treatment research method of rock Not yet explicitly, the test process of existing test method is complicated and time-consuming.
The triaxial test of existing water rock coupling weakened treatment, experimental design are to keep each rock test piece confining pressure constant Under the conditions of, multiple rock test pieces are saturated, then applies hydraulic pressure at different levels respectively and carries out water rock coupled three-shaft whole compression process Test, to obtain the quantitative description that hydraulic pressure influences dam Foundation Rock Mass mechanics parameter.
In conclusion a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment is needed, thus The intensity for simulating water rock coupling reduction in crack rock, realizes the processing of geography information.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of coupling of measurement crack rock test specimen water rock is weak The load path method for changing effect, the invention proposes a kind of new easy load path methods, exist to study dam body basement rock Weakened treatment under water rock coupling provides technical support to solve dam body long-time stability problem.
The purpose of the present invention is achieved through the following technical solutions:
A kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment, steps are as follows for test method:
A kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment, which is characterized in that test side Steps are as follows for method:
(1), sample preparation is tested, makes standard cylinder sample, it is highly straight that the diameter of the cylinder body, which is at least 50mm, Twice of diameter;
(2), experiment process step is divided into:
A. the forming process test of crack rock is simulated;
B. erosion, unloader test under river are simulated;
C. native state rock sample dynamic characteristic test;
D. test specimen saturation testing;
E. reduction test of the crack rock under different hydraulic pressure, different confining pressures;
(3), it test data analyzer: obtains axial stress σ 1 under each crack rock native state and every level-one hydraulic pressure and encloses The scatter plot of 3 relationship of σ is pressed, while obtaining intensive parameter c value and f value of the crack rock under native state and under hydraulic pressure at different levels.
By using above-mentioned test procedure, the present invention proposes that a kind of loading method of simplicity, measurement water rock coupling rock are weak Change the load path method of effect, there is good test effect, there is wide applicability in the art;Simultaneously should Test method be suitable for simulate dam foundation deep-seated fracture rock mass water rock coupling weakened treatment test, by design rock axis pressure, The load path of confining pressure, hydraulic pressure obtains the intensive parameter under rock water rock coupling weakened treatment, carries out rock mass strength parameter with this The research of rule is weakened, provides a kind of new method for the big library basement rock technical research steady in a long-term of high dam.Test obtained As a result facilitate the mechanical behavior for more profoundly recognizing crack rock under dam foundation dam abutment complex stress condition.
Further, the test sample preparation respectively bores an aperture 5mm, hole depth 80 at the both ends of test specimen using boring method The drilling of~90mm, the distance of the center line in two holes are 30mm.
By using above-mentioned test procedure, sampled by boring method, select suitable test specimen, guarantee test it is reliable Property and according to property.
Further, the forming process of the simulation crack rock, experimental stage first apply confining pressure to 60MPa, rear application Axis pressure.
By using above-mentioned test procedure, apply axis pressure and controlled by the way of Stress Control, and when close to destroying It changes one's position to strain controlling, rate is slow as far as possible, slow pressure break rock sample, so that test specimen is generated the plane of fracture, provides seepage channel.This stage adds It is loaded onto rock mass and enters the residual strength stage, is i.e. axial stress does not increase with strain and changed.
Further, confining pressure is slowly reduced to reduction test institute by erosion, unloader test under the simulation river by 60MPa The confining pressure 3MPa needed.The determination of reduction test confining pressure is mainly according to the crustal stress around the maximum hydraulic pressure and crack rock of test Level determines.
By using above-mentioned test procedure, by erosion, off-load under simulation river, confining pressure is slowly reduced to test institute by high The small confining pressure needed, it can be deduced that influence of the lower erosion and Unloading Effect in river to Dam Foundation Rock.
Further, the native state rock sample dynamic characteristic test obtains the natural shape of rock sample by triaxial compression test Intensive parameter under state.
By using above-mentioned test procedure, carries out native state rock sample dynamic characteristic test and obtained by triaxial compression test The intensive parameter under rock sample native state is obtained, can be inferred that rock sample resists the maximum capacity of stress difference.
Further, the test specimen saturation testing, crack rock test specimen are saturated the reduction experimental stage under different confining pressures, Keep the confining pressure in above procedure constant, axis pressure drop first applies 0.5MPa to the input end of rock test piece as low as suitable with confining pressure Infiltration hydraulic pressure, while outlet end be vented, after the air in test specimen excludes completely, close outlet valve, stop be vented.So Import and export end differential water pressures are monitored afterwards, and rock test piece saturation is completed when the differential water pressures are zero.
Rock test piece saturation process can be obtained by test by test specimen saturation testing by using above-mentioned test procedure Different degrees of destruction situation, obtain reliable test basis to analyze.
Further, reduction test of the crack rock under different hydraulic pressure, different confining pressures, confining pressure is reduced to 3MPa, hydraulic pressure are set as first order hydraulic pressure 0.5MPa, then confining pressure are increased step by step by 3MPa, 5MPa, 9MPa, 12MPa, each Water rock coupling compression test is carried out under grade confining pressure respectively, then hydraulic pressure is increased step by step as 1.0MPa, 1.5MPa, 2.0Mpa respectively, Every level-one hydraulic pressure increases confining pressure by 3MPa, 5MPa, 9MPa, 12MPa respectively step by step, the reduction experiment under different confining pressures.
By using above-mentioned test procedure, tested by reduction of the crack rock under different hydraulic pressure, different confining pressures, it can be with Know the influence situation of different hydraulic pressure and confining pressure to crack rock, infers different hydraulic pressure and confining pressure to the shadow of crack rock with this Loud supplemental characteristic.
The beneficial effects of the present invention are:
1, the present invention proposes a kind of loading method of simplicity, the load path side of measurement water rock coupling rock weakened treatment Method has good test effect, has wide applicability in the art;The test method is suitable for simulation simultaneously Dam foundation deep-seated fracture rock mass water rock coupling weakened treatment test, by design rock axis pressure, confining pressure, hydraulic pressure load road Diameter is obtained the intensive parameter under rock water rock coupling weakened treatment, the research of rock mass strength parameter reduction rule is carried out with this, is The big library basement rock technical research steady in a long-term of high dam provides a kind of new method.Test result obtained facilitates more deep Ground recognizes the mechanical behavior of rock mass under the complex stress of deep.
2, it is sampled by boring method, selects suitable test specimen, the reliability of guarantee test and according to property;Pass through simulation Confining pressure is slowly reduced to the required small confining pressure of test by high, it can be deduced that it can be concluded that the lower erosion in river by erosion, off-load under river And influence of the Unloading Effect to Dam Foundation Rock;Native state rock sample dynamic characteristic test is carried out, three axis under different confining pressures are passed through Compression test obtains the intensive parameter under rock sample native state, can be inferred that rock sample resists the maximum capacity of stress difference;Pass through Test specimen saturation testing can be obtained the different degrees of destruction situation of rock test piece saturation process by test, be obtained to analyze Reliable test basis;By reduction test of the crack rock under different hydraulic pressure, different confining pressure, it is known that different hydraulic pressure and Influence situation of the confining pressure to crack rock, the quantitative parameter number of the influence of different hydraulic pressure and confining pressure to crack rock is inferred with this According to.
Detailed description of the invention
Fig. 1 is the sample system for the load path method that a kind of measurement crack rock test specimen water rock of the present invention couples weakened treatment It is on the waiting list sample schematic diagram;
Fig. 2 is the rock mass examination for the load path method that a kind of measurement crack rock test specimen water rock of the present invention couples weakened treatment Part is saturated unidirectional Water hydraulic static pressure loading situation section: schematic diagram;
Fig. 3 is the load path method rock test piece that a kind of measurement crack rock test specimen water rock of the present invention couples weakened treatment It is saturated two-way water pressure load condition diagrammatic cross-section;
Fig. 4 is that a kind of axis pressure for the load path method that measurement crack rock test specimen water rock couples weakened treatment of the present invention is enclosed Press Water hydraulic static pressure loading path curve schematic diagram;
Fig. 5 is that a kind of stress for the load path method that measurement crack rock test specimen water rock couples weakened treatment of the present invention is answered Become the Complete Curve schematic diagram;
Fig. 6 is the load path method typical case σ 1- σ that a kind of measurement crack rock test specimen water rock of the present invention couples weakened treatment 3 relation curve schematic diagrames.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to It is as described below.
As shown in Figures 1 to 6, a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment, examination Steps are as follows for proved recipe method:
S1:(1), sample preparation is tested:
It is standardized according to laboratory, first takes rock sample to be prepared as 5 samples having a size of φ 50mm × H100mm at scene;Examination Test consideration seepage effect, thus need to be formed in test specimen can the plane of fracture by seepage water or crack, therefore use boring method, trying The drilling of an aperture 5mm, 80~90mm of hole depth are respectively bored in the both ends of part, and the distance of the center line in two holes is 30mm, and drilling is shown It is intended to as shown in Figure 1.
S2:(2), experiment process:
A. the forming process test of crack rock is simulated;
First apply confining pressure to 60MPa, rear application axis pressure.Apply axis pressure to control by the way of Stress Control, and is connecing It changes one's position when nearly destruction to strain controlling, rate is slow as far as possible, slow pressure break rock sample, so that test specimen is generated the plane of fracture, provides seepage channel. This stage is loaded onto rock mass and enters the residual strength stage, i.e. axial stress does not increase with strain and changed.
B. erosion, unloader test under river are simulated;
Confining pressure is slowly reduced to required for reduction test by the process of erosion, off-load under this step simulations river as 60MPa Confining pressure 3MPa.The determination of reduction test confining pressure is mainly horizontal really according to crustal stress locating for the maximum hydraulic pressure and crack rock tested It is fixed.Usual situation, initial confining pressure should be greater than testing maximum hydraulic pressure, and maximum hydraulic pressure is 2MPa in this case column, therefore by follow-up test Confining pressure be determined as 3MPa, 5MPa, 9MPa, 12Mpa.
C. native state rock sample dynamic characteristic test;
This step-by-step test purpose is to obtain the intensity under rock sample native state by the triaxial compression test under different confining pressures When parameter, i.e. hydraulic pressure are 0, rock sample resists the maximum capacity (intensity) of stress difference.Hydraulic pressure is maintained 0MPa first;Then it presses 3MPa, 5MPa, 9MPa, 12MPa increase confining pressure step by step, carry out compression test respectively under every level-one confining pressure.Test first uses power Switch to lateral strain control after control, until axial stress terminates when not increasing with strain and changing;Stress difference is dropped again later As low as primitive axis pressure, confining pressure is adjusted to next stage, repeats above-mentioned test process, until the reduction of four confining pressure steps has been tested At.It obtains under 0.0MPa hydraulic pressure, the corresponding rock mass strength of different confining pressures.
D. test specimen saturation testing;
It keeps confining pressure and axis in above procedure to press constant, first applies the infiltration water of 0.5MPa to the input end of rock test piece Pressure, while outlet end is vented, (as shown in Figure 2), after the air in test specimen excludes completely, is closed outlet valve, is stopped row Gas.Then import and export end differential water pressures are monitored, rock test piece saturation completes (as shown in Figure 3) when the differential water pressures are zero.
E. reduction test of the crack rock under different confining pressures is as follows:
1), reduction test 1 (hydraulic pressure is reduction test of the crack rock under different confining pressures under 0.5MPa);
Confining pressure is reduced to 3MPa, hydraulic pressure is set as first order hydraulic pressure 0.5MPa, then by 3MPa, 5MPa, 9MPa, 12MPa increases confining pressure step by step, carries out water rock coupling compression test respectively under every level-one confining pressure.Test is first using after power control turns For lateral strain control, terminate when axial stress does not change with strain increase;Stress difference is reduced to initially again later Axis pressure, confining pressure are adjusted to next stage, repeat above-mentioned test process, are completed until the reduction of four confining pressure steps is tested.It obtains Under 0.5MPa hydraulic pressure, the corresponding rock mass strength of different confining pressures;
2), reduction test 2 (hydraulic pressure is reduction test of the crack rock under different confining pressures under 1.0MPa);
Confining pressure is reduced to 3MPa, hydraulic pressure is set as second level hydraulic pressure 1.0MPa, then by 3MPa, 5MPa, 9MPa, 12MPa increases confining pressure step by step, carries out water rock coupling compression test respectively under every level-one confining pressure.Test is first using after power control turns For lateral strain control, terminate when axial stress does not change with strain increase;Stress difference is reduced to initially again later Axis pressure, confining pressure are adjusted to next stage, repeat above-mentioned test process, are completed until the reduction of four confining pressure steps is tested.It obtains 1.0MPa under hydraulic pressure, the corresponding rock mass strength of different confining pressures;
3), reduction test 3 (hydraulic pressure is reduction test of the crack rock under different confining pressures under 1.5MPa);
Confining pressure is reduced to 3MPa, hydraulic pressure is set as third level hydraulic pressure 1.5MPa, then by 3MPa, 5MPa, 9MPa, 12MPa increases confining pressure step by step, carries out water rock coupling compression test respectively under every level-one confining pressure.Test is first using after power control turns For lateral strain control, terminate when axial stress does not change with strain increase;Stress difference is reduced to initially again later Axis pressure, confining pressure are adjusted to next stage, repeat above-mentioned test process, are completed until the reduction of four confining pressure steps is tested.It obtains Under 1.5MPa hydraulic pressure, the corresponding rock mass strength of different confining pressures;
4), reduction test 4 (hydraulic pressure is reduction test of the crack rock under different confining pressures under 2.0MPa);
Confining pressure is reduced to 3MPa, hydraulic pressure is set as fourth stage hydraulic pressure 2.0MPa, then by 3MPa, 5MPa, 9MPa, 12MPa increases confining pressure step by step, carries out water rock coupling compression test respectively under every level-one confining pressure.Test is first using after power control turns For lateral strain control, terminate when axial stress does not change with strain increase;Stress difference is reduced to initially again later Axis pressure, confining pressure are adjusted to next stage, repeat above-mentioned test process, are completed until the reduction of four confining pressure steps is tested.It obtains Under 2.0MPa hydraulic pressure, the corresponding rock mass strength of different confining pressures;
Test data is as shown in Figure 4 and Figure 5.
S3:(3), test data analyzer:
Dissipating for the axial stress σ 1 and 3 relationship of confining pressure σ under each crack rock native state and every level-one hydraulic pressure can be obtained Point diagram (as shown in Figure 6), while intensive parameter c of the crack rock under native state and under hydraulic pressure at different levels can also be calculated Value and f value.
S4: this test proposes a kind of new test loading method, and same rock only needs to be tested in a sample, And then study water rock and couple weakened treatment, reduction test is coupled compared to raw water rock, by Data Comparison Analysis, can be obtained Out:
A. test specimen stress condition more meets reality.Reservoir level has the characteristics of cyclically-varying, corresponding reservoir area basement rock Periodically variable circulating pressure is born, the coupling reduction test of water rock is completed on a test specimen and more meets basement rock stress spy Point;
B. test period is saved.According to previous experiences, the water rock coupling reduction property for studying a kind of rock is needed at least 3 Test is completed on group test specimen, every group of test specimen requires dress sample, unloads sample, prefabricated crack, take considerable time, and on a test specimen Completion can at least save for 50% or more time;
C. test specimen is saved;
D. influence of the rock sample discrete type to Experiment Result is avoided.
The above is only a preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein Form should not be regarded as an exclusion of other examples, and can be used for other combinations, modifications, and environments, and can be at this In the text contemplated scope, modifications can be made through the above teachings or related fields of technology or knowledge.And those skilled in the art institute into Capable modifications and changes do not depart from the spirit and scope of the present invention, then all should be in the protection scope of appended claims of the present invention It is interior.

Claims (7)

1. a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment, which is characterized in that test method Steps are as follows:
(1), sample preparation is tested, makes standard cylinder sample, it is highly diameter that the diameter of the cylinder body, which is at least 50mm, Twice;
(2), experiment process step is divided into:
A. the forming process test of crack rock is simulated;
B. erosion, unloader test under river are simulated;
C. native state rock sample dynamic characteristic test;
D. test specimen saturation testing;
E. reduction test of the crack rock under different hydraulic pressure, different confining pressures;
(3), the axial stress σ 1 and confining pressure σ 3 under each crack rock native state and every level-one hydraulic pressure test data analyzer: are obtained The scatter plot of relationship, while obtaining intensive parameter c value and f value of the crack rock under native state and under hydraulic pressure at different levels.
2. a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment according to claim 1, It is characterized in that, the test sample preparation respectively bores an aperture 5mm, 80~90mm of hole depth at the both ends of test specimen using boring method Drilling, the distance of the center line in two holes is 30mm.
3. a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment according to claim 1, It is characterized in that, the forming process of the simulation crack rock, experimental stage first applies confining pressure to 60MPa, rear application axis pressure.
4. a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment according to claim 1, It is characterized in that, erosion, unloader test under the simulation river, confining pressure is slowly reduced to required for reduction test as 60MPa Confining pressure 3MPa.The determination of reduction test confining pressure is mainly horizontal really according to the crustal stress around the maximum hydraulic pressure and crack rock of test It is fixed.
5. a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment according to claim 1, It is characterized in that, the native state rock sample dynamic characteristic test is obtained under rock sample native state by triaxial compression test Intensive parameter.
6. a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment according to claim 1, It is characterized in that, the test specimen saturation testing, crack rock test specimen is saturated the reduction experimental stage under different confining pressures, in holding The confining pressure stated in program is constant, and axis pressure drop is as low as, the first infiltration that the input end of rock test piece applies 0.5MPa suitable with confining pressure Hydraulic pressure, while outlet end is vented, and after the air in test specimen excludes completely, is closed outlet valve, is stopped exhaust.Then it monitors Import and export end differential water pressures, rock test piece saturation is completed when the differential water pressures are zero.
7. a kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment according to claim 1, It is characterized in that, reduction test of the crack rock under different hydraulic pressure, different confining pressures, is reduced to 3MPa, hydraulic pressure for confining pressure It is set as first order hydraulic pressure 0.5MPa, then increases confining pressure step by step by 3MPa, 5MPa, 9MPa, 12MPa, under every level-one confining pressure Water rock is carried out respectively and couples compression test, then hydraulic pressure is increased step by step as 1.0MPa, 1.5MPa, 2.0Mpa, every level-one water respectively Pressure increases confining pressure by 3MPa, 5MPa, 9MPa, 12MPa respectively step by step, the reduction experiment under different confining pressures.
CN201910600470.4A 2019-07-04 2019-07-04 A kind of load path method of measurement crack rock test specimen water rock coupling weakened treatment Pending CN110220787A (en)

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杨宝全 等: "高拱坝坝肩软岩及结构面强度参数水岩耦合弱化效应试验研究", 《四川大学学报(工程科学版)》 *
穆鹏飞: "基于水—岩耦合试验的峰峰组灰岩渗透性规律分析", 《能源与环保》 *

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