CN110146389B - True triaxial direct shear test box and method for simulating force-heat-liquid coupling environment - Google Patents
True triaxial direct shear test box and method for simulating force-heat-liquid coupling environment Download PDFInfo
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- CN110146389B CN110146389B CN201910341417.7A CN201910341417A CN110146389B CN 110146389 B CN110146389 B CN 110146389B CN 201910341417 A CN201910341417 A CN 201910341417A CN 110146389 B CN110146389 B CN 110146389B
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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
- G01N1/286—Preparing 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
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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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- 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
- G01N2203/0025—Shearing
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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
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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Abstract
The invention discloses a true triaxial direct shear test box and a method for simulating a force-heat-liquid coupling environment, wherein the true triaxial direct shear test box comprises a direct shear box and a test piece bin positioned in the direct shear box, the direct shear box comprises a sealing gland device, a loading pressure head device, a sliding pressure plate device, a hydraulic device and a heating device, the loading pressure head device comprises a vertical loading pressure head, a horizontal loading pressure head and a shearing pressure head, the sliding pressure plate device comprises an upper sliding pressure plate and a side sliding pressure plate, the upper sliding pressure plate is positioned below the vertical loading pressure head, and the upper sliding pressure plate can relatively slide along the vertical loading pressure head; six side-slipping movable pressing plates are arranged and can slide relatively along the horizontal loading pressing head and the shearing pressing head; the hydraulic device comprises a hydraulic oil inlet and a hydraulic oil outlet; the heating device comprises a heating groove and a heating wire. The invention effectively simulates the rock mass environment below kilometers and truly reflects the rock mass shearing failure characteristics under the force-heat-liquid coupling environment.
Description
Technical Field
The invention relates to a large-size true triaxial direct shear test box and a method for simulating a force-heat-liquid coupling environment, in particular to a large-size true triaxial direct shear test box and a test method capable of simulating a high-temperature, high-ground-pressure and high-water-pressure environment in a dry hot rock development process.
Background
China is a country with large geothermal resource reserves in the world, and geothermal resources become novel clean energy for key research and development of countries in the world due to extremely high cleanness, operation stability and wide spatial distribution. The hot dry rock resources in the depth of 3-10 km in China land are about 26 ten thousand times of the total annual energy consumption in China at present. The geothermal energy development has a plan, and specially and definitely points out various technologies for actively exploring and developing the hot dry rock, so that shear failure and crack propagation characteristics of a hot dry rock reservoir fracture in a force-heat-liquid coupling environment and under water injection pressure are further systematically researched, a shear crack formation mechanism of the hot dry rock is deeply researched, a key technical problem is broken through the bottleneck of the hot dry rock development technology, and important theoretical value and practical guiding significance are provided for future energy conservation and emission reduction, environmental pollution control and new energy structure adjustment in China.
However, the conventional direct shear test device has the following disadvantages:
(1) the shear test cannot be carried out on the test piece, and simultaneously, three-dimensional stress cannot be applied, or the sliding displacement of the test piece cannot be solved; (2) the shear test under the coupling environment of high ground pressure, high water pressure and high temperature is difficult to carry out, and the sealing performance of the device cannot be ensured; (3) the size of a traditional direct shear test sample is usually less than 7mm, and the shear test result is difficult to reflect a real hot dry rock mass; (4) the traditional direct shear test box can not realize the acoustic emission monitoring of the test process.
CN204807547U discloses a stress seepage coupling true triaxial shear box, mainly is small-size true triaxial direct shear-seepage test, and the device can't satisfy the condition of large-size rock mass shear test, also does not consider the problem of high temperature, high hydraulic pressure.
CN103743633B discloses a fluid-solid coupling coal rock shearing-seepage test device, which is mainly used for coal rock shearing-seepage tests and cannot meet the conditions of true triaxial loading and force-heat-liquid coupling.
In summary, the test apparatus in the prior art has not solved the technical problems of true triaxial pressurizing active shearing, force-heat-liquid coupling simulation, large-size samples and the like. Accordingly, the relevant researchers in this field are working on developing a large-sized true triaxial direct shear test cartridge for simulating a force-heat-liquid coupling environment.
Disclosure of Invention
The invention aims to provide a true triaxial direct shear test box and a test method for simulating a force-heat-liquid coupling environment, the true triaxial direct shear test box can push the upper part and the lower part of a rock test piece to shear relatively, can also carry out a direct shear test on a large-size sample, ensures that the periphery of the rock sample is subjected to constant three-dimensional stress, constant high stress, high temperature and high water pressure environment, can realize acoustic emission monitoring on the whole process of the shear test, and can embody the dynamic evolution characteristic and the slippage failure characteristic of shear cracks when the rock is fractured by a complex external force underground.
One of the tasks of the invention is to provide a true triaxial direct shear test box for simulating a force-heat-liquid coupling environment, and the technical solution thereof comprises:
a true triaxial direct shear test box for simulating a force-heat-liquid coupling environment comprises a direct shear box and a test piece bin positioned in the direct shear box, wherein a concrete shear block and a shear sample are placed in the test piece bin, the concrete shear block comprises an upper shear block and a lower shear block, and the shear sample is arranged between the upper shear block and the lower shear block;
the direct shear box comprises a sealing gland device, a loading pressure head device, a sliding pressure plate device, a hydraulic device and a heating device, wherein the sealing gland device is of a frame-shaped structure and consists of an upper gland, a side gland, a heating gland and a bottom gland, wherein adjacent glands are tightly connected;
the loading pressure head device comprises a vertical loading pressure head, a horizontal loading pressure head and a shearing pressure head, wherein the vertical loading pressure head is positioned on the upper pressure cover, the horizontal loading pressure head is positioned on the lateral pressure cover, and the shearing pressure head is positioned on the heating pressure cover;
the sliding pressure plate device comprises an upper sliding pressure plate and a side sliding pressure plate, the upper sliding pressure plate is positioned below the vertical loading pressure head, and the upper sliding pressure plate can relatively slide along the vertical loading pressure head; the side-slipping movable pressing plates are provided with six, four of the side-slipping movable pressing plates are positioned on one side of the horizontal loading pressing head, and the other two side-slipping movable pressing plates are positioned on one side of the shearing pressing head and can slide along the horizontal loading pressing head and the shearing pressing head relatively;
The hydraulic device comprises a hydraulic oil inlet and a hydraulic oil outlet, the hydraulic oil inlet and the hydraulic oil outlet are positioned above the heating gland, and the hydraulic oil inlet is connected with a hydraulic pump and an oil tank;
heating device include heating tank and heater strip, the heating tank be located the below of heating gland the heating tank in arrange the heater strip, the heater strip is used for the hydraulic oil intensification in the circular telegram back with the test piece storehouse.
As a preferable aspect of the present invention, the sizes of the upper cutout and the lower cutout are 200mm × 200mm × 150mm, and the distance between the upper cutout and the lower cutout is 10 mm; the shear sample is a cubic original rock sample, and the side length size of the shear sample is more than 70mm and less than 150 mm.
As another preferable aspect of the present invention, a plurality of first ball grooves are disposed on the upper end surface of the upper sliding platen, each first ball groove is provided with a first ball, and the relative sliding between the upper sliding platen and the vertical loading ram is realized through the first ball.
Furthermore, a plurality of second ball grooves are formed in the opposite surfaces of the side-slipping movable platen and the horizontal loading pressure head and the shearing pressure head, a second ball is arranged on each second ball groove, and the side-slipping movable platen and the horizontal loading pressure head and the shearing pressure head slide relatively through the second balls.
Furthermore, adjacent glands are connected together through a high-temperature-resistant sealing gasket and a fastening bolt.
Further, the heating groove is a rectangular groove.
Furthermore, an acoustic emission exploratory hole is formed in the upper end face of the side-slipping movable platen and used for fixing an acoustic emission sensor.
Another task of the present invention is to provide a true triaxial direct shear test method for simulating a force-heat-liquid coupling environment, which uses the test box, and the method includes:
a. preparing a test piece, namely respectively preparing an upper shear block and a lower shear block with the sizes of 200mm multiplied by 150mm, and preparing a cubic original rock sample as a shear sample;
b. mounting, namely embedding a horizontal loading pressure head into the side gland, embedding the shearing pressure head into the heating gland, and mutually fixing and sealing the two side glands, the two heating glands and the bottom gland; embedding an acoustic emission sensor into an acoustic emission detection hole, and arranging a side-sliding movable platen on the opposite side of a horizontal loading pressure head and a shearing pressure head; placing the upper shear block and the lower shear block in a test chamber, sequentially closing and covering an upper sliding pressure plate, a vertical loading pressure head and an upper gland, and fixedly sealing;
placing the large-size true triaxial direct shear test box in a true triaxial pressure tester to be tested, connecting a hydraulic oil inlet and a hydraulic oil outlet with a hydraulic pump and an oil tank by using a high-pressure-resistant hose, and connecting an acoustic emission sensor and a heating wire;
c. Injecting hydraulic oil, heating and pressurizing, injecting the hydraulic oil into the test bin through a hydraulic oil inlet by using a hydraulic pump, switching on a power supply, heating the hydraulic oil by using a heating wire, and monitoring the temperature of the hydraulic oil by using an external temperature sensor so as to achieve test conditions; increasing the oil pressure until a hydraulic condition is satisfied;
d. the method comprises the following steps of (1) testing, opening a true triaxial pressure testing machine, applying vertical stress and horizontal stress, monitoring a sample through an acoustic emission monitoring device, and applying shear stress until the sample is damaged; and (4) after the test is finished, relieving confining pressure and extracting hydraulic oil, observing the damage form of the sample, and disclosing the dynamic evolution characteristic of the shear crack and the slippage damage mechanism by combining test data and the crack propagation form.
Compared with the prior art, the invention has the following beneficial technical effects:
firstly, a shear box main body made of high-density steel with high compressive strength and good water erosion resistance can simulate a high ground stress environment of a deep dry hot rock reservoir; the tungsten filament is arranged in the heating groove, the hydraulic oil is heated to 300 ℃ at most, and the heat preservation of the test box is realized in a mode of an external sensor; the inside of the test box is filled with hydraulic oil to simulate underground high-pressure water, the oil pressure in the test box is loaded to 5MPa by using an external oil pump, and meanwhile, the pressure can be maintained, so that the simulation of a force-heat-liquid coupling environment is met.
And secondly, by adopting a split type rigid sliding pressure plate, a ball and a pressure head, the shearing displacement within 5mm can be realized, and the damage forms of different rock samples and the spatial form distribution characteristics of shearing cracks under different temperature, hydraulic pressure and stress conditions can be fully researched.
And thirdly, an acoustic emission exploration hole is formed in the upper end face of the side-sliding movable platen and used for fixing an acoustic emission sensor, and monitoring of acoustic emission events, energy, amplitude and other parameters in the rock shearing and breaking process is achieved.
Fourthly, the size of the whole shear block in the test bin is 200mm multiplied by 300mm, the size of the internal effective rock mass can reach 150mm multiplied by 150mm, and the shear test result of the large-size test sample can really realize the mechanical property of the hot dry rock mass.
Fifthly, the test box can simulate the coupling environment of high ground stress, high water pressure and high ground temperature of deep rock mass, the direct shear test of large-size original rock under the true triaxial environment is realized by utilizing the sliding pressure plate, the acoustic emission information monitoring of the whole test process is realized by the channel acoustic emission probing hole, the rock mass environment below kilometer is effectively simulated, and the rock mass shear failure characteristic under the force-heat-liquid coupling environment is truly reflected.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a front cross-sectional view of a large-scale true triaxial direct shear test box for simulating a force-heat-liquid coupling environment according to the present invention;
FIG. 2 is a side sectional view of the test cartridge of the present invention;
FIG. 3 is an assembly view of the upper slide platen of the test cartridge of the present invention;
FIG. 4 is a side-slipping movable platen assembly of the test cartridge of the present invention;
FIG. 5 is an assembly view of a heated gland of the test cartridge of the present invention.
The reference numbers are as follows:
1-upper gland; 2-side gland; 3-heating and pressing the cover; 31-a heating tank; 32-heating wires; 4-bottom gland; 5, vertically loading a pressure head; 6-horizontal loading pressure head; 7-shearing pressure head; 8-sliding pressing plate of upper end head; 9-side end head sliding pressing plate; 91-acoustic emission probe hole; 10-a ball bearing; 11-hydraulic oil inlet; 12-hydraulic oil outlet; 13-large size concrete cutouts; 14-shearing the sample; 15-fastening bolts; 16-high temperature resistant sealing gasket.
Detailed Description
The invention provides a true triaxial direct shear test box and a method for simulating a force-heat-liquid coupling environment, and the invention is described in detail below with reference to specific embodiments in order to make the advantages and technical scheme of the invention clearer and clearer.
Referring to fig. 1 to 5, the present invention provides a true triaxial direct shear test box for simulating a force-heat-liquid coupling environment, which includes a test piece chamber and a direct shear box. The large-size concrete shear blocks 13 and the shear samples 14 are arranged in the test piece bin, the shear samples 14 are embedded in the middle parts of the two concrete shear blocks 13, and the distance between the two concrete shear blocks 13 is 10 mm.
The direct shear box comprises a sealing gland device, a loading pressure head device, a sliding pressure plate device, a hydraulic device and a heating device. The sealing gland device comprises an upper gland 1, a side gland 2, a heating gland 3 and a bottom gland 4, wherein each gland is provided with a fastening bolt 15 and a high-temperature-resistant sealing gasket 16, and the glands are tightly connected by the high-temperature-resistant sealing gaskets 16 and the fastening bolts 15, so that the high-temperature resistance and the high sealing property of the direct shear box are ensured;
the upper gland 1 is provided with a vertical loading pressure head 5, the side gland 2 is provided with a horizontal loading pressure head 6, and the heating gland 3 is provided with a shearing pressure head 7, a heating groove 31, a heating wire 32, a hydraulic oil inlet 11 and a hydraulic oil outlet 12.
The loading pressure head device comprises a vertical loading pressure head 5, a horizontal loading pressure head 6 and a shearing pressure head 7.
The sliding pressure plate device comprises an upper end head sliding pressure plate 8 and a side end head sliding pressure plate 9; the upper end head sliding pressing plate 8 is positioned below the vertical loading pressing head 5, the upper end face of the upper end head sliding pressing plate 8 is provided with a ball groove, and balls 10 are arranged in the ball groove to ensure that the upper end head sliding pressing plate 8 and the vertical loading pressing head 5 can slide; six side end head sliding press plates 9 are arranged, four of the side end head sliding press plates are located on one side of the horizontal loading pressure head 6, one side end head sliding press plate 9 is arranged up and down, two of the side end head sliding press plates are located on one side of the shearing pressure head 7, a ball groove is formed in the upper end face of the side end head sliding press plate 9, balls 10 are arranged in the ball groove, and an acoustic emission probing hole 91 is formed in the upper end face of the side end head sliding press plate 9 and used for fixing an acoustic emission sensor to monitor acoustic emission parameters of the test process.
The hydraulic device comprises a hydraulic oil inlet 11 and a hydraulic oil outlet 13, the hydraulic oil inlet 11 and the hydraulic oil outlet 13 are positioned above the heating gland 3, and a high-pressure rubber pipe is fixed by using a high-pressure sealing ring.
The heating device comprises a heating groove 31 and a heating wire 32, the heating groove 31 is positioned below the heating gland 3 and is processed into a rectangular groove, the heating wire 32 is arranged in the heating groove 31, the heating wire 32 is electrified to heat the hydraulic oil in the test piece bin, a tungsten wire is arranged in the heating groove to heat the hydraulic oil to 300 ℃ at most, and the heat preservation of the test box is realized in a mode of an external sensor; the inside of the test box is filled with hydraulic oil to simulate underground high-pressure water, the oil pressure in the test box is loaded to 5MPa by using an external oil pump, and meanwhile, the pressure maintaining can be realized.
With the above test kit, the test can be carried out according to the following steps:
(1) preparation of test pieces
Raw rock: sealing a raw rock sample taken from a field by using a preservative film, placing the raw rock sample in a core taking machine for coring, finally carefully polishing the taken raw rock by using a grinding machine into a cubic coal rock sample, wherein the minimum size of the cubic rock sample is 70mm multiplied by 70mm, and the maximum size of the cubic rock sample is 150mm multiplied by 150mm, and placing the manufactured raw rock in a constant-temperature and constant-humidity curing box for curing.
Concrete shearing block: preparing C30 concrete, wherein the mass ratio of water, cement, sand and stones is 0.38:1:1.11:2.72, placing the prepared concrete in a double-open mould of 200mm multiplied by 150mm for tamping, placing the prepared original rock sample in the middle of the concrete, and simultaneously ensuring that half of the cubic rock sample is embedded into the concrete; placing a 10mm backing plate above the double-open mould, placing a 200mm multiplied by 150mm double-open mould above the backing plate, and pouring concrete for tamping; and after the concrete shear block is formed, placing the manufactured concrete shear block in a constant-temperature and constant-humidity curing box for curing.
(2) Test piece installation and installation machine
Embedding a horizontal loading pressure head 6 into the side gland 2, embedding a shearing pressure head 7 into the heating glands 3, and mutually fixing and sealing the two side glands 2, the two heating glands 3 and the bottom gland 4 by using fastening bolts 15 and a high-temperature-resistant sealing gasket 16; embedding an acoustic emission sensor into the acoustic emission detecting hole 91, and arranging a side end head sliding pressing plate 9 provided with a ball 10 on the horizontal loading pressure head 6; one side of the shearing pressure head 7; the concrete shear block 13 is placed in a test chamber, an upper end head sliding pressure plate 8, a vertical loading pressure head 5 and an upper pressure cover 1 are sequentially sealed, and a fastening bolt 15 and a high-temperature-resistant sealing gasket 16 are used for fixing and sealing.
The true triaxial direct shear test box is placed in a true triaxial pressure tester to be tested, a hydraulic oil inlet 11 and a hydraulic oil outlet 12 are connected with a hydraulic pump and an oil tank by a high-pressure hose, and an acoustic emission sensor and a heating wire 32 are connected.
(3) Injecting hydraulic oil, raising temperature and pressurizing
Hydraulic oil is injected into the test chamber through a hydraulic oil inlet 11 by a hydraulic pump, the hydraulic oil is heated by a heating wire 32 after a power supply is switched on, and the temperature of the hydraulic oil is monitored by an external temperature sensor so as to achieve test conditions; the oil pressure is increased until the hydraulic conditions are satisfied.
(4) To carry out the test
Opening a true triaxial pressure tester, applying vertical stress and horizontal force, opening an acoustic emission monitoring device to monitor the sample, and applying shear stress until the test piece is damaged; and (4) after the test is finished, relieving confining pressure, extracting hydraulic oil, taking out the concrete shear block, observing the damage form of the test piece, and disclosing the dynamic evolution characteristic of the shear crack and the slippage damage mechanism by combining test data and the crack propagation form.
The parts which are not described in the invention can be realized by taking the prior art as reference.
It should be noted that: any equivalents, or obvious variations thereof, which may occur to those skilled in the art and which are commensurate with the teachings of this specification, are intended to be within the scope of the present invention.
Claims (5)
1. The utility model provides a true triaxial direct shear test box for simulating power-heat-liquid coupling environment, includes the direct shear box and is located test piece storehouse in the direct shear box, test piece storehouse in be used for placing concrete shear block and shearing sample, its characterized in that:
the concrete shear block comprises an upper shear block and a lower shear block, and the shear sample is arranged between the upper shear block and the lower shear block;
the direct shear box comprises a sealing gland device, a loading pressure head device, a sliding pressure plate device, a hydraulic device and a heating device, wherein the sealing gland device is of a frame-shaped structure and consists of an upper gland, a side gland, a heating gland and a bottom gland, wherein adjacent glands are tightly connected;
the loading pressure head device comprises a vertical loading pressure head, a horizontal loading pressure head and a shearing pressure head, wherein the vertical loading pressure head is positioned on the upper pressure cover, the horizontal loading pressure head is positioned on the lateral pressure cover, and the shearing pressure head is positioned on the heating pressure cover;
the sliding pressure plate device comprises an upper sliding pressure plate and a side sliding pressure plate, the upper sliding pressure plate is positioned below the vertical loading pressure head, and the upper sliding pressure plate can relatively slide along the vertical loading pressure head; the side-slipping movable press plates are provided with six, wherein four of the side-slipping movable press plates are positioned on one side of the horizontal loading press head and can relatively slide along the horizontal loading press head, and the other two side-slipping movable press plates are positioned on one side of the shearing press head and can relatively slide along the shearing press head;
The hydraulic device comprises a hydraulic oil inlet and a hydraulic oil outlet, the hydraulic oil inlet and the hydraulic oil outlet are positioned above the heating gland, and the hydraulic oil inlet is connected with a hydraulic pump and an oil tank;
the heating device comprises a heating groove and a heating wire, the heating groove is positioned below the heating gland, the heating wire is arranged in the heating groove, and the heating wire is used for heating the hydraulic oil in the test piece bin after being electrified;
the sizes of the upper shearing block and the lower shearing block are 200mm multiplied by 150mm, and the distance between the upper shearing block and the lower shearing block is 10 mm; the shearing sample is a cubic original rock sample, and the side length size of the shearing sample is more than 70mm and less than 150 mm;
the upper end surface of the upper sliding pressure plate is provided with a plurality of first ball grooves, each first ball groove is provided with a first ball, and the relative sliding between the upper sliding pressure plate and the vertical loading pressure head is realized through the first balls;
the side-slipping movable platen and the opposite surfaces of the horizontal loading pressure head and the shearing pressure head are provided with a plurality of second ball grooves, each second ball groove is provided with a second ball, and the side-slipping movable platen and the horizontal loading pressure head and the shearing pressure head can slide relatively through the second balls.
2. The true triaxial direct shear test kit for simulating a force-heat-liquid coupling environment according to claim 1, wherein: the adjacent glands are connected together through a high-temperature-resistant sealing gasket and a fastening bolt.
3. The true triaxial direct shear test kit for simulating a force-heat-liquid coupling environment according to claim 2, wherein: the heating groove is a rectangular groove.
4. The true triaxial direct shear test kit for simulating a force-heat-liquid coupling environment according to claim 3, wherein: and the upper end surface of the side-sliding movable platen is provided with an acoustic emission probing hole, and the acoustic emission probing hole is used for fixing an acoustic emission sensor.
5. A true triaxial direct shear test method for simulating a force-heat-liquid coupling environment, wherein a large-sized true triaxial direct shear test box for simulating a force-heat-liquid coupling environment according to any one of claims 1 to 4 is adopted, the test method sequentially comprises the following steps:
a. preparing a test piece, namely respectively preparing an upper shear block and a lower shear block with the sizes of 200mm multiplied by 150mm, and preparing a cubic original rock sample as a shear sample;
b. mounting, namely embedding a horizontal loading pressure head into a side gland, embedding a shearing pressure head into a heating gland, and mutually fixing and sealing two side glands, two heating glands and a bottom gland; embedding an acoustic emission sensor into an acoustic emission detection hole, and arranging a side-sliding movable platen on the opposite side of a horizontal loading pressure head and a shearing pressure head; placing the upper shear block and the lower shear block in a test chamber, sequentially closing and covering an upper sliding pressure plate, a vertical loading pressure head and an upper gland, and fixedly sealing;
Placing the large-size true triaxial direct shear test box in a true triaxial pressure tester to be tested, connecting a hydraulic oil inlet and a hydraulic oil outlet with a hydraulic pump and an oil tank by using a high-pressure-resistant hose, and connecting an acoustic emission sensor and a heating wire;
c. injecting hydraulic oil, heating and pressurizing, injecting the hydraulic oil into the test bin through a hydraulic oil inlet by using a hydraulic pump, switching on a power supply, heating the hydraulic oil by using a heating wire, and monitoring the temperature of the hydraulic oil by using an external temperature sensor so as to achieve test conditions; increasing oil pressure until a hydraulic condition is met;
d. the method comprises the following steps of (1) testing, opening a true triaxial pressure testing machine, applying vertical stress and horizontal stress, monitoring a sample through an acoustic emission monitoring device, and applying shear stress until the sample is damaged; and (4) after the test is finished, relieving confining pressure and extracting hydraulic oil, observing the damage form of the sample, and disclosing the dynamic evolution characteristic of the shear crack and the slippage damage mechanism by combining test data and the crack propagation form.
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| CN112284929B (en) * | 2020-09-30 | 2022-02-01 | 中国科学院武汉岩土力学研究所 | Multifunctional multi-direction rock shearing-seepage-temperature multi-field coupling test method |
| CN113281194B (en) * | 2021-05-21 | 2022-06-03 | 东北大学 | Shear box device suitable for rock full stress space is loaded |
| CN116296765B (en) * | 2023-05-19 | 2023-08-01 | 北京科技大学 | High-temperature chemical rock shearing seepage coupling triaxial test device |
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