CN106198205B - Device and method for testing horizontal stress of soil sample in triaxial test process - Google Patents

Device and method for testing horizontal stress of soil sample in triaxial test process Download PDF

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CN106198205B
CN106198205B CN201610771155.4A CN201610771155A CN106198205B CN 106198205 B CN106198205 B CN 106198205B CN 201610771155 A CN201610771155 A CN 201610771155A CN 106198205 B CN106198205 B CN 106198205B
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sample
pressure chamber
triaxial
static
pressure
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CN106198205A (en
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王秀艳
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Institute of Hydrogeology and Environmental Geology CAGS
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Abstract

The invention discloses a device and a method for testing horizontal stress of a soil sample in a triaxial test process, which relate to the field of unconventional tests of geotechnical tests and comprise a processing module and a detection unit; the signal end of the detection unit is connected with the signal receiving end of the processing module; the detection unit comprises a collecting and controlling device, a radial stress sensor and a vertical pressure sensor; a pressure lever is arranged in the center of the top end of the static triaxial pressure chamber; the arc side surface of the pressure rod is connected with a static triaxial pressure chamber top shell; a cylinder body is connected to the position, close to the edge, of the bottom surface of the top shell of the static triaxial pressure chamber; the bottom surface of the pressure lever is connected with a sample cap; the bottom surface of the sample cap is connected with an upper permeable stone; the bottom surface of the upper permeable stone is connected with a sample; the outer side of the sample is wrapped with a latex film; the horizontal radial stress test of the soil sample has important significance for the research and related engineering of soil body slopes, ground settlement, ground cracks caused by exploiting underground water and the like.

Description

Device and method for testing horizontal stress of soil sample in triaxial test process
Technical Field
The invention relates to the field of unconventional tests of geotechnical tests, in particular to a device and a method for testing horizontal stress of a soil sample in a triaxial test process.
Background
The triaxial test is one of the important tests of soil mechanics, and is mainly used for testing the shear strength (c, g) of a sample,c: cohesion of soil, kPa;internal angle of friction, degree of soil) and lateral pressure coefficient (k)0Dimensionless), etc. However, in practice the vertical stress σ1In the course of increasing, the confining pressure σ3When the lateral stress is not changed, the inside of the sample can generate a lateral stress from inside to outside, and the soil body is extruded to generate lateral deformation until the soil body is damaged, the lateral horizontal stress from inside to outside is not tested in the past, the lateral stress has a particularly important significance for researching the influence of water level reduction and the like on the soil body caused by building foundation pit engineering, slope engineering and underground water mining, and the like, and a new device and a new method are urgently needed to be developed to achieve the aim.
Disclosure of Invention
The invention aims to provide a device and a method for testing horizontal stress of a soil sample in a triaxial test process, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the device and the method for testing the horizontal stress of the soil sample in the triaxial test process comprise a processing module and a detection unit; the signal end of the detection unit is connected with the signal receiving end of the processing module; the detection unit comprises a collecting and controlling device, a radial stress sensor and a vertical pressure sensor; a pressure lever is arranged in the center of the top end of the static triaxial pressure chamber; the arc side surface of the pressure lever is connected with a static triaxial pressure chamber top shell; the bottom surface of the top shell of the static triaxial pressure chamber is connected with a cylinder body at a position close to the edge; the bottom surface of the pressure lever is connected with a sample cap; the bottom surface of the sample cap is connected with an upper permeable stone; the bottom surface of the upper permeable stone is connected with a sample; the outer side of the sample is wrapped with an emulsion film; the top end of the static triaxial pressure chamber is connected with a static triaxial pressure chamber top plate.
Further stating the invention, the bottom surface of the sample is provided with a lower permeable stone; the bottom surface of the lower permeable stone is provided with a static triaxial pressure chamber base; and a surrounding pressure inlet and outlet pipe is arranged between one side of the sample and the cylinder.
The invention is further stated, the top end of the static triaxial pressure chamber top shell is provided with a sealing top cover; the cylinder body is made of high-pressure transparent glass; the top end of the pressure lever is connected with a connecting block; the connecting block is arranged in the center of the top plate of the static triaxial pressure chamber; a vertical pressure sensor is arranged in the center of the joint of the pressure lever and the connecting block; and a deformation sensor is arranged on one side of the vertical pressure sensor.
The invention is further stated, one end of the confining pressure inlet and outlet pipe is arranged at the inner side of the static triaxial pressure chamber; the other end of the confining pressure inlet and outlet pipe is arranged in the center of one side surface of the base of the static triaxial pressure chamber; and a lower pore water outlet pipe is arranged at the central position of the joint of the lower permeable stone and the base of the static triaxial pressure chamber.
Further stating the invention, the center of the arc side of the sample is provided with radial stress sensors; an upper pore water outlet pipe is arranged in the center of the joint of the sample cap and the upper permeable stone; the radial stress sensor is arranged on the fence; the bottom end of the fence is connected with the top surface of the base of the static triaxial pressure chamber; the fence is provided with a plurality of fixed on the base of the static triaxial pressure chamber; the number of radial stress sensors fixed on the fence is related to the properties of the sample; the other end of the upper pore water outlet pipe is connected with the side surface of the lower pore water outlet pipe.
Further stating the invention, the processing module comprises a computer, geotechnical data processing software; and a stand column is arranged between the static triaxial pressure chamber top plate and the static triaxial pressure chamber base.
The invention is further stated, the computer signal receiving end of the processing module is in data connection with the data output end of the acquisition and control device of the detection unit; the data input end of the acquisition and control device is connected with the static triaxial pressure chamber.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the matching of a detection unit and a processing module, the detection unit comprises an acquisition controller, a radial stress sensor and a vertical pressure sensor, the stress tested by the radial stress sensor is particularly a bulging force caused by the increase of the vertical pressure of a sample, the direction is the horizontal direction from inside to outside, the processing module is provided with a computer, the signal end of the detection unit is connected with the signal receiving end of the computer, the detection unit comprises a radial stress sensor which is arranged in a static triaxial pressure chamber, the test end is in tight contact with the sample (or in contact with a latex film outside the sample), one end of the radial stress sensor can be fixed on a fence of the static triaxial pressure chamber, the fence can be a hollow pipe, a connecting wire of the radial stress sensor can be placed in the pipe, the radial stress sensor can also be wireless, but one end still needs to be fixed on the fence of the static triaxial, the testing end of the radial stress sensor is in contact with the outer side surface of the sample, the radial stress sensor tests the horizontal stress of the sample, the collection is automatic, the pressure applied to the sample by the pressure lever is continuously increased along with the increase of time, and the pressure P1<P2<P3From unstressed to σ on the horizontal radial stress side of the specimen3-1Then becomes sigma3-3The other side is made of unstressed sigma3-2Then becomes sigma3-4The horizontal stress of the sample is increased continuously, and the height difference of the sample is changed from delta h1Becomes Δ h2The height difference of the sample also increases, and the pressure applied to the sample is P3When the sample is cracked, the processing module and the detection unit stop working when the sample is cracked according to the relevant test standards until the experiment is finished; the experimental data and results have important significance for research and related engineering of soil body side slopes, ground settlement, ground cracks caused by underground water exploitation and the like.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the horizontal stress variation of a sample according to the present invention;
fig. 3 is a flow chart of the present invention.
In the figure: 1. a processing module; 2. a controller is adopted; 3. a deformation sensor; 4. a pressure lever; 5. sealing the top cover; 6. a static triaxial pressure chamber; 7. a static triaxial pressure chamber top shell; 8. a vertical pressure sensor; 9. connecting blocks; 10. a barrel; 11. an upper pore water outlet pipe; 12. laying permeable stones; 13. surrounding and pressing the inlet pipe and the outlet pipe; 14. a static triaxial pressure chamber base; 15. a lower pore water outlet pipe; 16. coating a permeable stone; 17. a sample; 18. a pressure head; 19. a radial stress sensor; 20. a fence; 21. a detection unit; 22. a column; 23. static triaxial pressure chamber top plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: comprises a processing module 1 and a detection unit 21; the signal end of the detection unit 21 is connected with the signal receiving end of the processing module 1; the detection unit 21 comprises a collecting controller 2, a radial stress sensor 19 and a vertical pressure sensor 8; a pressure lever 4 is arranged at the center of the top end of the static triaxial pressure chamber 6; the arc side surface of the pressure lever 4 is connected with a static triaxial pressure chamber top shell 7; the bottom surface of the top shell 7 of the static triaxial pressure chamber is connected with a cylinder 10 at a position close to the edge; the bottom surface of the pressure lever 4 is connected with a sample cap 18; the bottom surface of the sample cap 18 is connected with an upper permeable stone 16; the bottom surface of the upper permeable stone 16 is connected with a sample 17; the outer side of the sample 17 is wrapped with an emulsion film; the top end of the static triaxial pressure chamber 6 is connected with a static triaxial pressure chamber top plate 23; the bottom surface of the sample 17 is provided with a lower permeable stone 12; the bottom surface of the lower permeable stone 12 is provided with a static triaxial pressure chamber base 14; a surrounding pressure inlet and outlet pipe 13 is arranged between one side of the sample 17 and the cylinder 10; a sealing top cover 5 is arranged at the top end of the top shell 7 of the static triaxial pressure chamber; the cylinder body 10 is made of high-pressure transparent glass; the top end of the pressure lever 4 is connected with a connecting block 9; the connecting block 9 is arranged at the central position of the static triaxial pressure chamber top plate 23; a vertical pressure sensor 8 is arranged at the central position of the joint of the pressure lever 4 and the connecting block 9; one side of the vertical pressure sensor 8 is provided with a deformation sensor 3; radial stress sensors 19 are arranged around the center of the arc side of the sample 17; one end of the confining pressure inlet and outlet pipe 13 is arranged at the inner side of the static triaxial pressure chamber 6; the other end of the confining pressure inlet and outlet pipe 13 is arranged at a position close to the center of one side surface of the static triaxial pressure chamber base 14; a lower pore water outlet pipe 15 is arranged at the central position of the joint of the lower permeable stone 12 and the static triaxial pressure chamber base 14; an upper pore water outlet pipe 11 is arranged at the central position of the joint of the sample cap 18 and the upper permeable stone 16; the radial stress sensor 19 is arranged on the fence 20; the bottom end of the fence 20 is connected with the top surface of the static triaxial pressure chamber base 14; the fence 20 is distributed and fixed on the static triaxial pressure chamber base 14; the number of radial stress sensors 9 fixed on the fence 20 is related to the nature of the test specimen; the other end of the upper pore water outlet pipe 11 is connected with the side surface of the lower pore water outlet pipe 15; the processing module 1 comprises a computer and geotechnical data processing software; a stand column 22 is arranged between the static triaxial pressure chamber top plate 23 and the static triaxial pressure chamber base 14; the computer signal receiving end of the processing module 1 is in data connection with the data output end of the acquisition controller 2 of the detection unit 21; the data input end of the acquisition and control device 2 is connected with a static triaxial pressure chamber 6.
In the specific implementation of the invention, the detection unit 21 comprises a collection controller 2, a radial stress sensor 19 and a vertical pressure sensor 8, the processing module 1 is provided with a computer, the signal end of the detection unit 21 is connected with the signal receiving end of the computer, the detection unit 21 comprises a radial stress sensor 19 arranged in the static triaxial pressure chamber 6, the testing end is in tight contact with the sample 17 (or in contact with a latex film outside the sample 17), one end of the radial stress sensor 19 is fixed on a fence 20 of the triaxial static triaxial pressure chamber 6, the fence 20 is a hollow pipe, a connecting line for placing the radial stress sensor 19 can be arranged in the pipe, the radial stress sensor 19 can also be wireless, but one end is still required to be fixed on the fence 20 of the static triaxial pressure chamber 6, the testing end of the radial stress sensor 19 is connected with the outer side surface of the sample 17, the radial stress sensor 19 tests the horizontal radial stress of the, the collection is automated, and the pressure exerted by the plunger 4 on the sample 17 increases continuously with time, for example: when vertical pressure P1<P2<P3From unstressed to σ on the horizontal stress side of the test piece 173-1Then becomes sigma3-3The other side is made of unstressed sigma3-2Then becomes sigma3-4The horizontal stress of the sample 17 becomes larger and the height difference of the sample 17 is represented by Δ h1Becomes Δ h2The height difference of the sample 17 also becomes large, and the sample 17 is subjected to a pressure P3And when the test sample 17 is rapidly vertically deformed to destroy the cracks, the experimental data and results have important significance on the research and related engineering of soil body side slopes, ground settlement, ground cracks caused by exploiting underground water and the like.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
In addition, the invention obtains the national science fund project: research (No: 41272301) of recognition method of groundwater critical mining water level and institute of Chinese geological academy: the development of a multi-field coupling type high-voltage triaxial test system (No: YYWF201628) is supported.

Claims (6)

1. Testing arrangement of soil sample horizontal stress among the triaxial test process, its characterized in that: comprises a processing module (1) and a detection unit (21); the signal end of the detection unit (21) is connected with the signal receiving end of the processing module (1); the detection unit (21) comprises a collecting and controlling device (2), a radial stress sensor (19) and a vertical pressure sensor (8); a pressure lever (4) is arranged in the center of the top end of the static triaxial pressure chamber (6); the arc side surface of the pressure lever (4) is connected with a static triaxial pressure chamber top shell (7); the bottom surface of the static triaxial pressure chamber top shell (7) close to the edge is connected with a cylinder body (10); the bottom surface of the pressure lever (4) is connected with a sample cap (18); the bottom surface of the sample cap (18) is connected with a permeable stone (16); the bottom surface of the upper permeable stone (16) is connected with a sample (17); the outer side of the sample (17) is wrapped with an emulsion film; the top end of the static triaxial pressure chamber (6) is connected with a static triaxial pressure chamber top plate (23);
a vertical pressure sensor (8) is arranged at the central position of the joint of the pressure lever (4) and the connecting block (9); one side of the vertical pressure sensor (8) is provided with a deformation sensor (3);
radial stress sensors (19) are arranged around the center of the arc side surface of the sample (17); an upper pore water outlet pipe (11) is arranged at the central position of the joint of the sample cap (18) and the upper permeable stone (16); the radial stress sensor (19) is arranged on the fence (20); the bottom end of the fence (20) is connected with the top surface of the static triaxial pressure chamber base (14); a plurality of fences (20) are arranged and fixed on a static triaxial pressure chamber base (14); the number of radial stress sensors (19) fixed to the fence (20) is dependent on the nature of the test specimen (17); the other end of the upper pore water outlet pipe (11) is connected with the side surface of the lower pore water outlet pipe (15).
2. The device for testing the horizontal stress of the soil sample in the triaxial test process according to claim 1, wherein: a lower permeable stone (12) is arranged on the bottom surface of the sample (17); the bottom surface of the lower permeable stone (12) is provided with a static triaxial pressure chamber base (14); and a surrounding pressure inlet and outlet pipe (13) is arranged between one side of the sample (17) and the cylinder body (10).
3. The device for testing the horizontal stress of the soil sample in the triaxial test process according to claim 1, wherein: a sealing top cover (5) is arranged at the top end of the static triaxial pressure chamber top shell (7); the cylinder (10) is made of high-pressure transparent glass; the top end of the pressure lever (4) is connected with a connecting block (9); the connecting block (9) is arranged in the center of the static triaxial pressure chamber top plate (23).
4. The device for testing the horizontal stress of the soil sample in the triaxial test process according to claim 2, wherein: one end of the confining pressure inlet and outlet pipe (13) is arranged on the inner side of the static triaxial pressure chamber (6); the other end of the confining pressure inlet and outlet pipe (13) is arranged at a position close to the center on one side surface of the static triaxial pressure chamber base (14); and a lower pore water outlet pipe (15) is arranged at the central position of the joint of the lower permeable stone (12) and the static triaxial pressure chamber base (14).
5. The device for testing the horizontal stress of the soil sample in the triaxial test process according to claim 1, wherein: the processing module (1) comprises a computer and geotechnical data processing software; an upright post (22) is arranged between the static triaxial pressure chamber top plate (23) and the static triaxial pressure chamber base (14).
6. The device for testing the horizontal stress of the soil sample in the triaxial test process according to claim 1, wherein: and a computer signal receiving end of the processing module (1) is in data connection with a data output end of the acquisition and control device (2) of the detection unit (21).
CN201610771155.4A 2016-08-31 2016-08-31 Device and method for testing horizontal stress of soil sample in triaxial test process Active CN106198205B (en)

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CN108088757B (en) * 2018-02-02 2019-02-19 中国矿业大学 The three-axis force experimental rig and method of a kind of simulated high-pressure water congeals into ice process
CN109520799B (en) * 2018-11-21 2020-05-08 中国科学院武汉岩土力学研究所 Sample preparation method for eliminating embedding effect of strongly weathered rock rubber film

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