Shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions

Abstract

The present invention provides a shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions, and belongs to the field of geotechnical testing. The test device includes a rotatably arranged mounting seat, a heating chamber is opened in the rock sample, the rock sample is disassembled and installed on the mounting seat, a concrete test block is cast on the surface of the rock sample, a liquid storage tank is connected to the heating chamber through a first connecting pipe, a heater is installed in the liquid storage tank and heats the heat transfer medium, the heat transfer medium is heated by the heater and then injected into the heating chamber, thereby heating the inside of the rock sample, a shear box is sleeved on the concrete test block, and a shear force supply assembly provides shear power for the shear box. The present application can heat the inside of the rock sample by setting up a heating chamber and a heat transfer medium, so as to truly simulate the high rock temperature and ensure the accuracy of the experimental results.

Description

Technical Field

[0001] The invention belongs to the field of geotechnical testing, and in particular relates to a shear strength testing device for the contact surface between concrete and surrounding rock under high rock temperature conditions. Background Art

[0002] Shotcrete is mostly used in tunnel and underground cavern projects after the excavation of the face. It is closely bonded with the surrounding rock to fill the gaps between the rock masses, so that the shotcrete and the rock mass are integrated to increase the overall mechanical strength and stability. With the rapid development of my country's transportation industry, tunnel and underground cavern projects are gradually developing in the direction of deep burial and growth. In areas with high altitudes, high ground stress and complex plate tectonics, high rock temperature has become an engineering problem that seriously affects safe construction and structural stress. As the first step to ensure the safety of construction after tunnel excavation, the support effect of shotcrete depends largely on the shear strength between the shotcrete and the surrounding rock. It is particularly important to determine the effect of high temperature on the shear strength of the contact surface between the shotcrete and the surrounding rock.

[0003] At present, the test of shear strength between shotcrete and surrounding rock is mostly carried out indoors. The shotcrete is sprayed on the rock sample collected on site, and the solidified concrete is cut into a suitable shape. Then, the shear strength of the rock-concrete interface is measured using a rock direct shear device. When performing high-temperature simulation, the rock with concrete is placed in a curing box, and the temperature in the curing box is controlled to simulate the high rock temperature of the rock. However, in actual engineering, the high rock temperature rock is used as a heat source to dissipate heat to the concrete and tunnel chamber. The current high rock temperature simulation method is different from the high rock temperature in actual engineering, which will cause the experimental results to deviate from the actual situation.

[0004] In summary, the problem with the current high rock temperature simulation device is that there is a certain difference between the current high rock temperature simulation method and the high rock temperature situation in actual engineering, which will cause the experimental results to deviate from the actual situation. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions, which is used to solve the problem that there is a certain difference between the current high rock temperature simulation method in the prior art and the high rock temperature situation in actual engineering, which will lead to deviations between the experimental results and the actual situation.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the present invention provides a shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions, comprising: A mounting seat, wherein the mounting seat is rotatably arranged, and the rotation axis of the mounting seat is parallel to the horizontal plane; A rock sample, wherein a heating chamber is provided in the rock sample, and the rock sample is detachably mounted on a mounting seat; A concrete test block, wherein the concrete test block is poured on the surface of the rock sample; A heating unit, the heating unit comprising a liquid storage tank and a heater, the liquid storage tank being connected to the heating chamber through a first connecting pipe, the liquid storage tank containing a heat transfer medium, the heater being installed in the liquid storage tank and heating the heat transfer medium, the heat transfer medium being heated by the heater and then injected into the heating chamber, thereby heating the inside of the rock sample; A shear test unit comprises a shear box and a shear force supply assembly. The shear box is sleeved on a concrete test block, and the shear force supply assembly provides shear power for the shear box.

[0007] As an optional solution, the heating unit further includes a water pump, a second connecting pipe and a pressure valve; The second connecting pipe is connected with the liquid storage tank and the heating chamber, and the pressure valve is installed on the second connecting pipe; The water pump is installed on the first connecting pipe.

[0008] As an option, the heat transfer medium is water or a muddy water mixture.

[0009] As an optional solution, the rock sample is made by 3D printing, and there are a number of water-permeable gaps in the rock sample.

[0010] As an optional solution, the test device further comprises a test support frame and a first rotational power source; The mounting seat is rotatably mounted on the test support frame; The first rotation power source drives the mounting seat to rotate.

[0011] As an optional solution, the mounting seat includes a mounting plate and a rotating disk; The mounting plate is rotatably mounted on the test support frame, and the rotation axis of the mounting plate is the rotation axis of the mounting seat; The self-rotating disk is rotatably mounted on the mounting plate, and the rotation axis of the self-rotating disk is perpendicular to the bottom end surface of the mounting plate; The rock sample is disassembled and installed on a rotating disk.

[0012] As an optional solution, the shear force supply assembly includes a lifting module, a front-to-back moving module and a left-to-right moving module; The lifting module is arranged on the mounting plate, and the lifting direction of the lifting end of the lifting module is perpendicular to the bottom end surface of the mounting plate; The front-to-back moving module is arranged on the lifting end of the lifting module, and the moving direction of the front-to-back moving end of the front-to-back moving module is perpendicular to the lifting direction of the lifting end of the lifting module; The left-right moving module is arranged on the front-to-back moving end of the front-to-back moving module, the moving direction of the left-right moving end of the left-right moving module is perpendicular to the lifting direction of the lifting end of the lifting module, and the moving direction of the left-right moving end of the left-right moving module is also perpendicular to the moving direction of the front-to-back moving end of the front-to-back moving module; The shear box is fixedly mounted on the left and right moving ends of the left and right moving module.

[0013] As an optional solution, the lifting module includes a lifting bracket, a guide rod and a lifting power source; One end of the guide rod is fixedly mounted on the mounting plate, and the axis of the guide rod is perpendicular to the bottom end surface of the mounting plate; The lifting bracket is slidably mounted on the guide rod; The lifting power source is fixedly mounted on the mounting plate, and the lifting power source provides lifting power for the lifting bracket.

[0014] As an optional solution, the forward and backward moving module includes a first bracket and a first sliding power source; The first bracket is slidably mounted on the lifting bracket, and the sliding direction of the first bracket is perpendicular to the axial direction of the guide rod; The first sliding power source drives the first bracket to slide.

[0015] As an optional solution, the left-right moving module includes a second bracket and a second sliding power source; The second bracket is slidably mounted on the first bracket, the sliding direction of the second bracket is perpendicular to the sliding direction of the first bracket, and the sliding direction of the second bracket is also perpendicular to the axial direction of the guide rod; The second sliding power source drives the second bracket to slide; The shear box is fixedly mounted on the second bracket.

[0016] As described above, the shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions proposed by the present invention has at least the following beneficial effects: 1. The application can heat the rock sample by setting up a heating chamber and a heat transfer medium, thereby simulating the high rock temperature and ensuring the accuracy of the experimental results; 2. The present application provides a self-rotating plate, a lifting bracket, a first bracket and a second bracket, so that the shear box can be quickly inserted into the concrete test block; 3. The present application can control the pressure of the heat transfer medium in the heating chamber by setting up a water pump and a pressure valve, thereby simulating experimental conditions under different water pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1Shown is a schematic diagram of the structure of the present invention; Figure 2 Shown is a schematic diagram of the installation of the liquid storage tank and the heater of the present invention; Figure 3 Shown is a cross-sectional view of a test device of the present invention; Figure 4 Shown is a cross-sectional view of the structure of the shear test unit of the present invention.

[0018] In the figure: 1, mounting seat; 11, mounting plate; 12, rotating disk; 13, test support frame; 14, first rotation power source; 21. rock sample; 22. heating chamber; 31. Concrete test block; 41. Liquid storage tank; 42. Heater; 43. First connecting pipe; 44. Water pump; 45. Second connecting pipe; 46. Pressure valve; 51. Shear box; 521, lifting bracket; 522, guide rod; 523, lifting power source; 531, a first bracket; 532, a first sliding power source; 541. A second bracket; 542. A second sliding power source. DETAILED DESCRIPTION

[0019] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0020] See also Figures 1 to 4 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0021] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0022] See also Figures 1 to 4The present invention provides a shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions, which comprises: A mounting seat 1, wherein the mounting seat 1 is rotatably arranged, and the rotation axis of the mounting seat 1 is parallel to the horizontal plane; A rock sample 21, wherein a heating chamber 22 is provided in the rock sample 21, and the rock sample 21 is detachably mounted on the mounting base 1; The rock sample 21 is not limited here, and can be a rock directly taken from a construction site, and the rock has water-permeable gaps therein; or can be a rock made by 3D printing, and the rock sample has a plurality of water-permeable gaps therein, and the water-permeable gaps are directly printed by 3D printing; When the rock sample 21 is a rock taken directly from the construction site, the disassembled installation of the rock sample 21 on the mounting seat 1 is achieved in the following manner: the upper end face of the rock sample 21 is fitted with the mounting seat 1, and the lower end face of the rock sample 21 has two parallel pressing blocks, both ends of the pressing blocks are threadedly connected to the mounting seat 1 through a bolt, so as to achieve the installation of the rock sample 21 (this rock sample installation method is not shown in the drawings of the specification); the heating chamber 22 is opened in the rock sample 21 in the following manner: the rock sample 21 can be cut into two halves first, and then a first groove is opened on the cut end face, and then the two halves of the rock sample are closed and a sealant is applied to the closed part, or one end of the rock sample 21 is ground flat, and a second groove is opened on the ground end face, the ground surface of the rock sample 21 is fitted with the mounting seat 1, and a sealing ring is placed between the ground surface and the mounting seat 1, and the pressure applied to the rock sample 21 by the pressing blocks can seal the rock sample 21 with the mounting seat 1; When the rock sample 21 is 3D printed, four ears can be designed on the side wall of the rock sample 21 during 3D printing, and the ears are threadedly connected to the mounting seat 1 through screws, thereby achieving the installation of the rock sample 21; Since the rocks in actual projects generally contain a certain amount of groundwater, the groundwater seeps outward through the permeable cracks on the rocks. In this embodiment, the permeable cracks provided can also allow the rock samples in the test to more realistically simulate the rock seepage conditions in actual projects. A concrete test block 31, wherein the concrete test block 31 is cast on the surface of the rock sample 21; A heating unit, the heating unit comprises a liquid storage tank 41 and a heater 42, the liquid storage tank 41 is connected to the heating chamber 22 through a first connecting pipe 43, and the liquid storage tank 41 contains a heat transfer medium; The heat transfer medium is not limited here. Its function is to heat the rock sample 21. The heat transfer medium is water or a mixture of mud and water. In this embodiment, the heat transfer medium is water. The heater 42 is installed in the liquid storage tank 41 and heats the heat transfer medium. The heat transfer medium is heated by the heater 42 and then injected into the heating chamber 22, thereby heating the inside of the rock sample 21. The shear test unit comprises a shear box 51 and a shear force supply assembly. The shear box 51 is sleeved on the concrete test block 31 , and the shear force supply assembly provides shear power for the shear box 51 .

[0023] In actual engineering, rocks are used as heat sources to dissipate heat to concrete and tunnel chambers. At the same time, the ventilation and cooling effects in the tunnel after tunnel excavation are gradually revealed, which will also enable the rock temperature to achieve a certain amount of heat dissipation. The curing box under the current test environment controls the temperature and humidity in the curing box to make the rock inside and outside have a certain rock temperature. The heating time will be longer, and the rock in this case cannot reflect the heat dissipation effect of the rock temperature. Therefore, the rock with rock temperature in the current test cannot accurately reflect the shear strength between concrete and surrounding rock in actual engineering.

[0024] First, the concrete test block 31 is cast on the rock sample 21. When the concrete test block 31 is completely solidified, the rock sample 21 is installed on the mounting base 1, and the heater 42 is started to heat the heating medium in the liquid storage tank 41, and the heating medium is introduced into the heating chamber 22, so as to heat the inside of the rock sample 21. The shear box 51 is put on the concrete test block 31, and the shear force supply component provides shear power to the shear box 51 to realize the shear test of the concrete test block 31. By heating the inside of the rock sample 21 and then conducting the test, the consistency of the high-temperature rock in the test process and the high-temperature rock in the actual project is guaranteed, thereby ensuring the accuracy of the test.

[0025] In this embodiment, in order to fully simulate the ventilation and heat dissipation effects in the tunnel, a fan can also be installed on one side of the rock sample 21, and the wind blown by the fan is directed at the heated rock sample 21, so that the ventilation and heat dissipation of the rock sample 21 can be simulated. The fan can also be set to have an adjustable wind speed, so that different ventilation effects can be simulated.

[0026] In this embodiment, please refer to Figures 1 to 4 , the heating unit further includes a water pump 44, a second connecting pipe 45 and a pressure valve 46; The second connecting pipe 45 connects the liquid storage tank 41 and the heating chamber 22 , and the pressure valve 46 is installed on the second connecting pipe 45 ; The water pump 44 is installed on the first connecting pipe 43 .

[0027] The heater 42 heats the water in the liquid storage tank 41, and starts the water pump 44 to guide the water in the liquid storage tank 41 to the heating chamber 22 through the first connecting pipe 43. When the heating chamber 22 is full of water, the water pump 44 continues to start, so that the water flows from the heating chamber 22 back to the liquid storage tank 41 through the second connecting pipe 45, thereby continuously heating the inside of the rock sample 21; By providing a pressure valve 46, the amount of water flowing out of the second connecting pipe 45 can be controlled, thereby simulating rock seepage conditions under different water pressures.

[0028] In this embodiment, please refer to Figures 1 to 4 , the test device also includes a test support frame 13 and a first rotation power source 14; The mounting seat 1 is rotatably mounted on the test support frame 13; The first rotation power source 14 drives the mounting base 1 to rotate.

[0029] The first rotational power source 14 is not limited here, and its function is to provide rotational power to the mounting base 1, and can be a motor, etc.; Starting the first rotating power source 14 can drive the mounting base 1 to rotate, so that the rock sample 21 installed on the mounting base 1 can be rotated. Since the tunnel is arc-shaped, the angles of rocks at different heights in the tunnel will be different. By setting the rotating rock sample 21, the rock sample 21 can be tilted at different angles, thereby simulating rock samples 21 at different heights in the tunnel.

[0030] At the same time, due to the rotatable setting of the mounting seat 1, the end surface of the mounting seat 1 on which the rock sample 21 is mounted can also be rotated downward, so as to facilitate the loading and installation of the rock sample 21.

[0031] In this embodiment, please refer to Figures 1 to 4 , the mounting seat 1 comprises a mounting plate 11 and a rotating disk 12; The mounting plate 11 is rotatably mounted on the test support frame 13, and the rotation axis of the mounting plate 11 is the rotation axis of the mounting seat 1; The self-rotating disk 12 is rotatably mounted on the mounting plate 11, and the rotation axis of the self-rotating disk 12 is perpendicular to the bottom end surface of the mounting plate 11; The rock sample 21 is disassembled and installed on the rotating disk 12 .

[0032] A rotating shaft is fixedly mounted on the upper end surface of the rotating disk 12, and the rotating shaft is rotatably mounted on the mounting plate 11. The upper end surface of the rotating shaft passes through the upper and lower end surfaces of the mounting plate 11. A rotating motor is fixedly mounted on the upper end surface of the mounting plate 11, and the motor shaft of the rotating motor is fixedly connected to the rotating shaft. When the rotating motor is started, the rotating disk 12 is driven to rotate through the rotating shaft, thereby driving the rock sample 21 mounted on the rotating disk 12 to rotate, so as to facilitate adjustment of the angle of the rock sample 21 and to facilitate alignment of the shear box 51 with the concrete test block 31.

[0033] In this embodiment, please refer to Figures 1 to 4 , the shear force supply assembly includes a lifting module, a front-to-back moving module and a left-to-right moving module; The lifting module is arranged on the mounting plate 11, and the lifting direction of the lifting end of the lifting module is perpendicular to the bottom end surface of the mounting plate 11; The front-to-back moving module is arranged on the lifting end of the lifting module, and the moving direction of the front-to-back moving end of the front-to-back moving module is perpendicular to the lifting direction of the lifting end of the lifting module; The left-right moving module is arranged on the front-to-back moving end of the front-to-back moving module, the moving direction of the left-right moving end of the left-right moving module is perpendicular to the lifting direction of the lifting end of the lifting module, and the moving direction of the left-right moving end of the left-right moving module is also perpendicular to the moving direction of the front-to-back moving end of the front-to-back moving module; The shear box 51 is fixedly mounted on the left and right moving ends of the left and right moving module.

[0034] The shear box 51 can be moved up and down by the lifting module, can be moved forward and backward by the forward and backward moving module, and can be moved left and right by the left and right moving module, so that the shear box 51 can be aligned with the concrete test block 31 and accurately put on the outside of the concrete test block 31.

[0035] In this embodiment, please refer to Figures 1 to 4 , the lifting module includes a lifting bracket 521, a guide rod 522 and a lifting power source 523; One end of the guide rod 522 is fixedly mounted on the mounting plate 11, and the axis of the guide rod 522 is perpendicular to the bottom end surface of the mounting plate 11; The lifting bracket 521 is slidably mounted on the guide rod 522; The lifting power source 523 is fixedly mounted on the mounting plate 11 , and the lifting power source 523 provides lifting power for the lifting bracket 521 .

[0036] The lifting power source 523 is not limited here. Its function is to provide lifting power for the lifting bracket 521. It can be a cylinder, a hydraulic cylinder, an electric telescopic rod, or a first motor and a lead screw. The first motor is fixedly mounted on the mounting plate 11, and the lead screw is rotatably mounted on the mounting plate 11. The rotation axis of the lead screw is perpendicular to the bottom end surface of the mounting plate 11. The lead screw is threadedly connected to the lifting bracket 521. When the first motor is started, the lead screw is driven to rotate, thereby driving the lifting bracket 521 to move up and down. By starting the lifting power source 523 , the shear box 51 can be driven to move up and down, so that the shear box 51 can be conveniently placed outside the concrete test block 31 .

[0037] In this embodiment, please refer to Figures 1 to 4 , the forward and backward moving module includes a first bracket 531 and a first sliding power source 532; The first bracket 531 is slidably mounted on the lifting bracket 521, and the sliding direction of the first bracket 531 is perpendicular to the axial direction of the guide rod 522; The first sliding power source 532 drives the first bracket 531 to slide.

[0038] The first sliding power source 532 is not limited here, and its function is to provide sliding power for the first bracket 531, and can be a cylinder, a hydraulic cylinder, an electric telescopic rod, etc.; Starting the first sliding power source 532 can drive the first bracket 531 to slide, thereby indirectly driving the shear box 51 to move forward and backward, making it convenient to put the shear box 51 on the outside of the concrete test block 3. When the shear box 51 is put on the outside of the concrete test block 31, a shear force in the front-to-back direction can be applied to the concrete test block 31, thereby realizing a shear test in the front-to-back direction.

[0039] In this embodiment, please refer to Figures 1 to 4 , the left-right moving module includes a second bracket 541 and a second sliding power source 542; The second bracket 541 is slidably mounted on the first bracket 531, and the sliding direction of the second bracket 541 is perpendicular to the sliding direction of the first bracket 531, and the sliding direction of the second bracket 541 is also perpendicular to the axial direction of the guide rod 522; The second sliding power source 542 drives the second bracket 541 to slide; The shear box 51 is fixedly mounted on the second bracket 541 .

[0040] The second sliding power source 542 is not limited here, and its function is to provide sliding power for the second bracket 541, and can be a cylinder, a hydraulic cylinder, an electric telescopic rod, etc.; Starting the second sliding power source 542 can drive the shear box 51 to move left and right, making it convenient to put the shear box 51 outside the concrete test block 31. After the shear box 51 is put outside the concrete test block 31, shear force in the left and right directions can also be applied to the concrete test block 31 to realize a shear test in the left and right directions.

[0041] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions is characterized by: include: A mounting seat, wherein the mounting seat is rotatably arranged, and the rotation axis of the mounting seat is parallel to the horizontal plane; A rock sample, wherein a heating chamber is provided in the rock sample, and the rock sample is detachably mounted on a mounting seat; A concrete test block, wherein the concrete test block is poured on the surface of the rock sample; A heating unit, the heating unit comprising a liquid storage tank and a heater, the liquid storage tank being connected to the heating chamber through a first connecting pipe, the liquid storage tank containing a heat transfer medium, the heater being installed in the liquid storage tank and heating the heat transfer medium, the heat transfer medium being heated by the heater and then injected into the heating chamber, thereby heating the inside of the rock sample; A shear test unit comprises a shear box and a shear force supply assembly. The shear box is sleeved on a concrete test block, and the shear force supply assembly provides shear power for the shear box.

2. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 1 is characterized in that: The heating unit also includes a water pump, a second connecting pipe and a pressure valve; The second connecting pipe is connected with the liquid storage tank and the heating chamber, and the pressure valve is installed on the second connecting pipe; The water pump is installed on the first connecting pipe.

3. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 1, characterized in that: The heat transfer medium is water or a mud-water mixture.

4. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 1, characterized in that: The rock sample is formed by 3D printing, and has a plurality of water-permeable gaps in the rock sample.

5. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 1, characterized in that: The test device also includes a test support frame and a first rotational power source; The mounting seat is rotatably mounted on the test support frame; The first rotation power source drives the mounting seat to rotate.

6. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 5, characterized in that: The mounting seat comprises a mounting plate and a rotating disk; The mounting plate is rotatably mounted on the test support frame, and the rotation axis of the mounting plate is the rotation axis of the mounting seat; The self-rotating disk is rotatably mounted on the mounting plate, and the rotation axis of the self-rotating disk is perpendicular to the bottom end surface of the mounting plate; The rock sample is disassembled and installed on a rotating disk.

7. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 6, characterized in that: The shear force supply assembly includes a lifting module, a front-to-back moving module and a left-to-right moving module; The lifting module is arranged on the mounting plate, and the lifting direction of the lifting end of the lifting module is perpendicular to the bottom end surface of the mounting plate; The front-to-back moving module is arranged on the lifting end of the lifting module, and the moving direction of the front-to-back moving end of the front-to-back moving module is perpendicular to the lifting direction of the lifting end of the lifting module; The left-right moving module is arranged on the front-to-back moving end of the front-to-back moving module, the moving direction of the left-right moving end of the left-right moving module is perpendicular to the lifting direction of the lifting end of the lifting module, and the moving direction of the left-right moving end of the left-right moving module is also perpendicular to the moving direction of the front-to-back moving end of the front-to-back moving module; The shear box is fixedly mounted on the left and right moving ends of the left and right moving module.

8. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 7, characterized in that: The lifting module includes a lifting bracket, a guide rod and a lifting power source; One end of the guide rod is fixedly mounted on the mounting plate, and the axis of the guide rod is perpendicular to the bottom end surface of the mounting plate; The lifting bracket is slidably mounted on the guide rod; The lifting power source is fixedly mounted on the mounting plate, and the lifting power source provides lifting power for the lifting bracket.

9. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 8, characterized in that: The forward and backward moving module includes a first bracket and a first sliding power source; The first bracket is slidably mounted on the lifting bracket, and the sliding direction of the first bracket is perpendicular to the axial direction of the guide rod; The first sliding power source drives the first bracket to slide.

10. The shear strength test device for the contact surface between concrete and surrounding rock under high rock temperature conditions according to claim 9, characterized in that: The left-right moving module includes a second bracket and a second sliding power source; The second bracket is slidably mounted on the first bracket, the sliding direction of the second bracket is perpendicular to the sliding direction of the first bracket, and the sliding direction of the second bracket is also perpendicular to the axial direction of the guide rod; The second sliding power source drives the second bracket to slide; The shear box is fixedly mounted on the second bracket.

Images