Shear slip test device for testing mechanical properties of high-temperature fractured rock mass

Abstract

The invention belongs to the field of rock-soil mechanical test equipment, and particularly discloses a shear slip test device for testing mechanical properties of high-temperature fractured rock mass, which comprises a shear test platform, a shear test box, a sound wave emission system, and a temperature control module and a circulating cooling system integrated in the shear test box. The shear test platform realizes independent control of normal force and shear force through a first loading block and a second loading block; the temperature control module and the circulating cooling system can simulate a high-temperature environment and perform a cold and hot cycle test; the acoustic emission system is used for monitoring acoustic emission signals in the rock sample in real time. The device can accurately simulate a high-temperature and cold-hot cycle environment, has high-precision mechanical loading capacity and a multi-parameter monitoring function, provides an effective experimental means for researching the mechanical property and damage mechanism of a high-temperature fractured rock mass, and can be widely applied to the research fields of deep geothermal resource development and enhanced geothermal systems.

Description

Technical Field

[0001] The present invention relates to the field of geotechnical mechanics test equipment, and particularly to a shear slip test device for testing the mechanical properties of high-temperature fractured rock masses. Background Art

[0002] In the process of deep geothermal resource development and the research of enhanced geothermal systems (EGS), accurately testing the shear mechanical properties of high-temperature fractured rock masses is a crucial step. However, there are many problems to be solved urgently in the direct shear test equipment widely used on the market at present, which seriously restricts the in-depth and accuracy of related research.

[0003] First, the traditional shear equipment has obvious deficiencies in temperature control. The deep geothermal environment is often in a high-temperature state of 150 - 300 °C and will experience frequent cold and hot cycles, with a temperature difference of more than 100 °C. However, the existing direct shear test equipment is difficult to accurately simulate such a complex high-temperature and cold and hot cycle environment, which makes it impossible to fully reflect the influence of temperature damage on the mechanical properties of rock masses during the test, resulting in a large deviation between the test results and the actual working conditions.

[0004] Second, the loading accuracy of the existing equipment is low. When conducting a shear test, the cooperative control accuracy of the shear force and the normal force is not high enough, which makes the data obtained during the test have a large discreteness and it is difficult to obtain stable and reliable mechanical property parameters.

[0005] Third, the parameter monitoring of the existing direct shear test equipment is single. Generally, only mechanical data such as stress changes can be monitored, and there is a lack of corresponding functions for collecting other important data such as acoustic emission and temperature. This makes it impossible for researchers to comprehensively and deeply understand the internal changes of rock masses during shear, restricting the research on the multi-field coupling effect of rock masses.

[0006] Therefore, there is an urgent need for a shear slip test device and a test method that can simulate a multi-field coupling environment of high temperature - mechanics - seepage and have high-precision, modular and multi-parameter monitoring functions. Summary of the Invention

[0007] The purpose of the present invention is to provide a shear slip test device for testing the mechanical properties of high-temperature fractured rock masses to solve the above technical problems existing in the prior art.

[0008] To achieve the above purpose, the present invention provides the following solution: A shear slip test device for testing the mechanical properties of high-temperature fractured rock masses, comprising:

[0009] The shear test platform includes two test bench bodies fixedly spaced on the test bench base, a first loading block connected to the top of the test bench body, and a second loading block connected to one side of the test bench body. The first loading block is used to generate a normal force on the rock specimen from the first direction, and the second loading block is used to generate a shear force on the rock specimen from the second direction;

[0010] The shear test box includes two left and right box bodies connected by sliding. The bottoms of the two box bodies are respectively fixedly connected with sliding bases, and the sliding bases are slidably installed between the two test bench bodies; A temperature control module and a circulating cooling system are connected in the specimen placement position for placing the rock specimen in the shear test box;

[0011] The acoustic emission system includes an acoustic emission probe and an acoustic receiving probe respectively installed at the front and rear positions of the shear test box. The acoustic emission probe and the acoustic receiving probe are respectively connected to an acoustic acquisition instrument through wires.

[0012] Optionally, the temperature control module includes a resistance heating sheet embedded in the inner wall of the shear test box, and the resistance heating sheet is connected to an external temperature control circuit.

[0013] Optionally, the resistance heating sheets are uniformly arranged on the inner wall of the shear test box, in direct contact with the rock specimen, and the temperature control range is 20 - 300 °C.

[0014] Optionally, the circulating cooling system includes a circulating cooling device, a circulating cooling pipe, and a circulating water flow channel inside the shear test platform; The coolant flows through the specimen placement position to cool down the rock specimen placed therein.

[0015] Optionally, a plurality of shear test box water inlet holes and a plurality of shear test box water outlet holes are respectively arranged on both sides of the specimen placement position. Each shear test box water inlet hole and shear test box water outlet hole are connected to the circulating water flow channel through a circulating cooling pipe.

[0016] Optionally, the first loading block and the second loading block are driven by a biaxial servo hydraulic unit.

[0017] Optionally, the size of the specimen placement position of the shear test box is 100×100×100 mm, the outer shell of the shear test box is made of metal material, and the inside is made of high-temperature resistant ceramic fiber composite material.

[0018] Optionally, the shear slip test device for testing the mechanical properties of high-temperature fractured rock masses further includes a data acquisition system. The data acquisition system includes a pressure sensor and a displacement sensor. The pressure sensor is arranged at the bottom and one side of the shear test platform, and the displacement sensor is arranged in the sliding groove on one side of the shear test platform.

[0019] Optionally, the pressure sensor is a high-precision strain gauge sensor, and the displacement sensor is a laser displacement sensor with a resolution of 1 μm.

[0020] Optionally, the sampling frequency of the acoustic wave emission system is greater than or equal to 100 kHz.

[0021] Compared with the prior art, the present invention discloses at least the following beneficial effects:

[0022] Through the first loading block and the second loading block of the shear test platform, the present invention can apply loads to the rock specimen from the normal direction and the shear direction respectively, realizing the independent control of the normal force and the shear force, and providing a basis for studying the mechanical properties of rocks under complex stress states. The temperature control module and the circulating cooling system integrated in the shear test box can heat and cool the rock specimen. The temperature control module can simulate a high-temperature environment, while the circulating cooling system can quickly reduce the temperature of the specimen after a high-temperature test, support hot and cold cycle tests, and effectively simulate the temperature change process under actual working conditions. The setting of the acoustic wave emission system enables the device to monitor the acoustic emission signals of the rock specimen during the shear process in real time, record the energy release law and location of shear damage inside the crack, and provide important data for studying the deterioration mechanism of the mechanical properties of rocks. To sum up, the device integrates functions such as mechanical loading, temperature control, cooling cycle, and acoustic emission monitoring, realizes the comprehensive test of high-temperature fractured rock masses under multi-field coupling conditions of mechanics, thermotics, and acoustics, and provides a comprehensive and accurate experimental means for in-depth study of the mechanical properties and damage mechanism of rock masses. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the shear slip test device of the present invention;

[0025] Figure 2 is Figure 1 a partial enlarged view of part A in

[0026] Figure 3 It is a top view of the shear slip test device of the present invention;

[0027] Figure 4 It is a front view of the shear slip test device of the present invention;

[0028] Figure 5This is the top view of the shear test box in the shear-slip test device of the present invention.

[0029] In the figure: 1. First loading block; 2. Coolant inlet; 3. Biaxial servo hydraulic unit; 4. Test bench base; 5. First loading block hydraulic column; 6. Circulating cooling pipe; 7. Shear test box water inlet hole; 8. Shear test box water outlet hole; 9. Acoustic emission probe; 10. Second loading block hydraulic column; 11. Specimen placement position; 12. Coolant outlet; 13. Second loading block; 14. Second metal top column; 15. First metal top column; 16. Resistance heating sheet; 17. Sliding groove; 18. Circulating water flow channel; 19. Sealing rubber ring; 20. Fixed bolt; 21. Test bench body. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] In order to study the influence of temperature damage deterioration on the mechanical properties of hot dry rock, the embodiments of the present invention propose a shear-slip test device for testing the mechanical properties of high-temperature fractured rock masses. The present invention can simulate a geothermal environment at high temperatures (150 - 300 °C), and under the water cooling effect of the circulating cooling system, the rock specimen can be quickly cooled down (▽T ≥ 100 °C). By repeatedly performing temperature cycles, the effect of temperature damage on the fracture interface of hot dry rock can be achieved. Finally, the shear resistance performance of the temperature-damaged rock specimen is tested through a hydraulic loading system, and the energy release law and location of shear damage inside the fracture are recorded by an acoustic emission system to study the influence of temperature damage on the mechanical properties of the rock, the characteristics of fracture temperature damage, and the slip friction evolution problem induced by injecting cooling water into the fractures of the rock specimen, revealing the deterioration mechanism of the mechanical properties of temperature-damaged fractures, and providing theoretical guidance for the exploitation and utilization of deep high-temperature geothermal resources.

[0032] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0033] Refer to Figures 1 to 5As shown in the figure, an embodiment of the present invention provides a shear-slip test device for testing the mechanical properties of high-temperature fractured rock masses, including a shear test platform, a hydraulic loading system, a temperature control module, a circulating cooling system, an acoustic emission system, and a data acquisition system. The shear test platform is the core of the entire device, used to carry the shear test box, and provide an installation foundation and connection interface for other components to ensure the stable placement of the rock specimen during the test and the effective functioning of each system. The shear test box is connected to the hydraulic loading system, the temperature control module, the circulating cooling system, the acoustic emission system, and the data acquisition system through their respective connection components and interfaces to jointly form a complete test platform.

[0034] The shear test platform includes a test bench base 4 and two test bench bodies 21 installed on the test bench base 4 through fixing bolts 20. A placement space for placing the shear test box is formed between the two test bench bodies 21. The shear test box includes two left and right box bodies connected in a sliding manner. The bottoms of the two box bodies are respectively fixedly connected with sliding bases, and the sliding bases are installed in a limited sliding manner between the two test bench bodies 21. A sliding groove 17 is opened in the left test bench body 21 for the sliding base to slide into. When the two box bodies approach each other, a shear force is formed on the rock specimen. At this time, the sliding groove 17 provides a space for the sliding base to slide in.

[0035] The hydraulic loading system includes a biaxial servo hydraulic unit 3 installed on the outer side surface of the left test bench body 21, and a first loading block 1 and a second loading block 13 that are drivingly connected to the biaxial servo hydraulic unit 3. The biaxial servo hydraulic unit 3 is connected to the first loading block 1 through a first loading block hydraulic column 5. Among them, there are four first loading block hydraulic columns 5, and the four first loading block hydraulic columns 5 are symmetrically distributed in pairs above the two test bench bodies 21. The first loading block 1 is supported on the tops of the four first loading block hydraulic columns 5. A first metal top column 15 is provided in the center of the first loading block 1. The metal top column is fixedly connected or abutted against one side box body of the shear test box. The first metal top column 15 is used to generate a normal load on the rock specimen from the first direction. The biaxial servo hydraulic unit 3 is connected to the second loading block 13 through a second loading block hydraulic column 10. Among them, there are four second loading block hydraulic columns 10, and the four second loading block hydraulic columns 10 slide horizontally in a symmetrically paired manner in the right test bench body 21. One end of each second loading block hydraulic column 10 extending out of the test bench body 21 is fixedly connected to the second loading block 13. A second metal top column 14 is provided in the middle of the second loading block 13. Among them, the second metal top column 14 freely penetrates the right test bench body 21 and is used to generate a shear load on the rock specimen from the second direction.

[0036] The first loading block 1 and the second loading block 13 with the above structure are used to provide normal loads and tangential loads to achieve independent control of normal forces from 0 to 500 kN and shear forces from 0 to 300 kN.

[0037] It should be understood that a metal pressing plate adapted to the size of the specimen placement position 11 in the shear test box can be connected to the end faces of the first metal top column 15 and the second metal top column 14, or a metal pressing plate can be directly placed on the rock specimen during the test.

[0038] The shear test box is used to carry the rock specimen and provide a coolant circulation flow path capable of cooling the rock specimen. Specifically, the shear test box has a specimen placement position 11. In a specific embodiment, the size of the specimen placement position 11 is 100×100×100 mm. The outer surface of the shear test box is made of a hard metal shell, and the inside is made of a high-temperature-resistant ceramic fiber composite material. A plurality of shear test box water inlet holes 7 and a plurality of shear test box water outlet holes 8 are respectively arranged on its left and right sides. Correspondingly, a corresponding number of coolant inlets 2 and coolant outlets 12 are respectively provided on the test bench body 21 on the left and right sides. It should be understood that during use, the coolant inlet 2 is connected to the shear test box water inlet hole 7 through the circulating cooling pipe 6, and the shear test box water inlet hole 7 is also connected to the coolant outlet 12. The coolant inlet 2 and the coolant outlet 12 are connected to the water inlet end and the water outlet end of the circulating cooling device through pipelines. In the above structure, the circulating cooling device, the circulating cooling pipe 6, and the circulating water flow path 18 located inside the shear test platform together form a circulating cooling system. When the circulating cooling system operates, the coolant flows through the specimen placement position 11 to cool down the rock specimen placed therein. The cooling rate is ≥30°C / min, and it supports hot and cold cycle tests.

[0039] In a specific embodiment, four shear test box water inlet holes 7 and four shear test box water outlet holes 8 are respectively arranged on the left and right sides of the shear test box.

[0040] In a specific embodiment, the circulating cooling device is in the same position as the biaxial servo hydraulic unit 3, both located in the test bench body 21 on the left side. It is linked with an external refrigerator by an integrated stainless steel cooling pipeline and is connected to the shear test box water inlet hole 7 on the left side of the shear test box and the coolant outlet 12 on the test bench body 21 on the right side through the circulating cooling pipe 6. Cold water is injected onto the heated rock specimen for cooling, and the circulating flow of the cooling water is realized through the circulating cooling pipe 6 path, quickly reducing the temperature of the rock specimen. It cooperates with the temperature control module to achieve hot and cold cycle tests, simulate the temperature change process under actual working conditions, and study the problem of slip friction evolution induced by the injection of cooling water into the cracks of the rock specimen.

[0041] The temperature control module includes a resistance heating sheet 16 embedded in the inner wall of the shear test box. The resistance heating sheet 16 is connected to an external temperature control circuit, and precise temperature regulation is achieved through PID closed-loop control. It is used to simulate the deep high-temperature geothermal environment, heat the rock specimen to make it reach the set high-temperature condition, so as to study the influence of temperature on the mechanical properties of rocks and the temperature damage caused by temperature cycling. In a specific embodiment, the temperature is controlled by the resistance heating sheet 16. The resistance heating sheets 16 are uniformly arranged on the inner wall of the shear test box and are in direct contact with the rock specimen. The temperature control range is 20 - 300 °C.

[0042] The acoustic emission system includes an acoustic emission probe 9 and an acoustic receiving probe respectively installed at the front and rear positions of the shear test box. The acoustic emission probe 9 and the acoustic receiving probe are respectively connected to an acoustic acquisition instrument through wires, and the monitored acoustic emission signals are transmitted to the data acquisition system for recording and analysis. It is used to record the energy release law and position of shear damage inside the crack. By monitoring the acoustic emission signals, the internal damage and crack propagation information of the rock specimen during shearing can be obtained in real time, providing important data for studying the deterioration mechanism of the mechanical properties of rocks.

[0043] In a specific embodiment, acoustic probe mounting holes are opened at the front and rear of the main body of the shear test box. The acoustic emission probe 9 is installed in the acoustic probe mounting hole at the front of the shear test box through an acoustic probe fixing spring, and the acoustic receiving probe is installed in the acoustic probe mounting hole at the rear of the shear test box through an acoustic probe fixing spring. The acoustic emission probe 9 and the acoustic receiving probe are respectively connected to an acoustic acquisition instrument through wires. The sampling frequency of the acoustic emission system with the above structure is ≥100 kHz.

[0044] The data acquisition system includes a pressure sensor and a displacement sensor. The pressure sensor is arranged at the bottom and left side of the shear test platform, and the displacement sensor is arranged in the sliding groove 17 on the left side of the shear test platform. It is used to collect the pressure and displacement data during the test in real time. Through high-precision sensors and data acquisition equipment, the stress change and displacement of the rock specimen during shearing are accurately recorded, providing basic data for subsequent data analysis and mechanical property evaluation. The pressure sensor and the displacement sensor are installed in the corresponding positions and are connected to the data acquisition equipment through wires, and the collected data is transmitted to the data acquisition system for storage and processing.

[0045] In a specific embodiment, the pressure sensor is a high-precision strain gauge sensor, and the displacement sensor is a laser displacement sensor with a resolution of 1 μm.

[0046] In a specific embodiment, a sealing rubber ring 19 is installed in the specimen placement position 11 of the shear test box to prevent the leakage of cooling water, ensuring the normal operation of the cooling circulation system and the sealing of the test process.

[0047] Compared with traditional shear test equipment, the shear slip test device of the embodiments of the present invention has the following advantages:

[0048] 1. The present invention adopts embedded resistance sheet heating, which is evenly distributed on the inner wall of the shear test box. Combined with PID closed-loop control, it can achieve precise temperature control up to 300°C (±1°C), and the heating rate can reach 50°C / min.

[0049] 2. The designed cooling circulation system of the present invention is linked with an external refrigerating machine through an integrated stainless steel cooling pipeline. The cooling rate is ≥30°C / min, and it supports thermal cycling tests (such as ▽T = 150°C → 25°C → 150°C, the number of cycles ≥ 100 times). It truly restores the damage deterioration process of EGS reservoir fractures under high-temperature thermal shock, filling the gaps in temperature simulation accuracy and dynamic cycling ability of traditional equipment.

[0050] 3. The servo hydraulic device of the present invention adopts a dual-axis servo hydraulic system. Verified by calibration tests through national metrological certification: under the condition of independent closed-loop control of normal force (0 - 500 kN) and shear force (0 - 300 kN), the loading accuracy reaches ±0.08% FS (full-scale error), which is better than the industry standard requirement of ±0.15% FS. Displacement control uses a laser displacement sensor for real-time monitoring. In the range of shear rate from 0.01 mm / min to 10 mm / min, the displacement resolution is stably maintained at 0.8 μm, and the linearity error ≤ 0.02%. Through repeated tests on granite standard specimens (100×100×100 mm) for n times, in a specific embodiment, n = 5, the repeatability error of shear displacement is controlled within ±1.2 μm, and the coincidence degree of the shear force-displacement curve reaches 98.7%. The combination design of a C3-level precision guide rail and a ball screw with a lead of 5 mm is adopted. Detected by a three-coordinate measuring instrument, the straightness error in the shear direction is ≤ 5 μm / m, effectively ensuring the linear accuracy and repeatability of shear displacement.

[0051] 4. The present invention is for multi-parameter synchronous monitoring. The data acquisition system adopts an integrated sensor group, including a pressure sensor, a displacement sensor, and acoustic emission monitoring, and synchronously records data through a multi-channel LabVIEW synchronous platform.

[0052] The embodiments of the present invention also provide a method for testing the mechanical properties of high-temperature fractured rock masses, using the shear slip test device for testing the mechanical properties of high-temperature fractured rock masses described in the above embodiments, including the following steps:

[0053] S1. Generate an autocorrelated heterogeneous aperture field based on the variogram, and use a three-dimensional engraving system to engrave a rough surface on the smooth granite surface of 100×100×100 mm to form a fractured specimen with reproducible roughness, contact area, and correlation length parameters;

[0054] S2. Place the prepared rock specimen into the shear test box, then place the shear test box on the shear test platform and fasten it with a buckle.

[0055] S3. Use the temperature control module to set the temperature to the target value. After the temperature reaches the target value, turn on the circulating cooling system. The cooling water flows into the shear test box through the circulating cooling pipe 6. After the cooling wastewater passes through the circulating water channel 18, it flows out from the coolant outlet 12. After reducing the temperature of the rock specimen to the set value, turn off the circulating cooling system. Then repeat the operation and perform the temperature cycle (▽T≥100℃) many times to cause temperature damage to the rock specimen.

[0056] S4. After performing the thermal and cold cycles many times, turn on the hydraulic loading system and the acoustic emission system. The biaxial hydraulic servo unit provides a normal force of 0 - 500 kN and a shear force of 0 - 300 kN to perform a shear test on the rock specimen.

[0057] S5. The data during the test is synchronously recorded by each sensor connected to the multi-channel LabVIEW synchronization platform through wires to complete the test.

[0058] S6. After completing the test, use microscopic technical means such as a CT scanning system, nanoindentation technology, optical angle measurement system, and white light microscope to characterize the evolution of the surface performance of the rock fractures before and after the test.

[0059] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0060] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A shear slip test device for testing mechanical properties of high temperature fractured rock mass, characterized in that: include: A shear test platform comprises two test bench bodies (21) fixed at intervals on a test bench base (4), a first loading block (1) connected to the top of the test bench body (21), and a second loading block (13) connected to one side of the test bench body (21), wherein the first loading block (1) is used to generate a normal force on a rock sample from a first direction, and the second loading block (13) is used to generate a shear force on the rock sample from a second direction; The shear test box comprises two left and right box bodies connected in a sliding manner, wherein the bottoms of the two box bodies are respectively fixedly connected with sliding bases, and the sliding bases are slidably installed between two test bench bodies (21); a temperature control module and a circulating cooling system are connected to a sample placement position (11) of the shear test box for placing a rock sample; The sonic wave transmitting system comprises a sonic wave transmitting probe (9) and a sonic wave receiving probe respectively installed at the front and rear positions of the shear test box, wherein the sonic wave transmitting probe (9) and the sonic wave receiving probe are respectively connected to a sonic wave collecting instrument via a wire.

2. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 1, characterized in that: The temperature control module comprises a resistance heating sheet (16) embedded in the inner wall of the shear test box, and the resistance heating sheet (16) is connected to an external temperature control circuit.

3. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 2, characterized in that: The resistance heating plates (16) are evenly arranged on the inner wall of the shear test box and are in direct contact with the rock sample, and the temperature control range is 20-300°C.

4. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 1, characterized in that: The circulating cooling system comprises a circulating cooling device, a circulating cooling pipe (6) and a circulating water flow channel (18) located inside the shear test platform; the cooling liquid flows through the sample placement position (11) to cool the rock sample placed therein.

5. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 4, characterized in that: A plurality of shear test box water inlet holes (7) and a plurality of shear test box water outlet holes (8) are respectively arranged on both sides of the sample placement position (11), and each of the shear test box water inlet holes (7) and the shear test box water outlet holes (8) is connected to a circulating water flow channel (18) via a circulating cooling pipe (6).

6. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 1, characterized in that: The first loading block (1) and the second loading block (13) are driven by a dual-axis servo hydraulic unit (3).

7. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 1, characterized in that: The size of the sample placement position (11) of the shear test box is 100×100×100 mm. The outer shell of the shear test box is made of metal, and the interior is made of high-temperature resistant ceramic fiber composite material.

8. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 1, characterized in that: It also includes a data acquisition system, which includes a pressure sensor and a displacement sensor. The pressure sensor is arranged at the bottom and one side of the shear test platform, and the displacement sensor is arranged in a sliding groove (17) on one side of the shear test platform.

9. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 8, characterized in that: The pressure sensor is a high-precision strain gauge sensor, and the displacement sensor is a laser displacement sensor with a resolution of 1 μm.

10. The shear slip test device for testing mechanical properties of high temperature fractured rock mass according to claim 1, characterized in that: The sampling frequency of the acoustic wave emission system is greater than or equal to 100 kHz.

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