Rock rough interface friction slip test device and test method

Abstract

The invention belongs to the field of earth science and engineering geology, and particularly relates to a rock rough interface friction slip test device and test method.According to the rock rough interface friction slip test device and test method, multiple first test pieces are attached to the outer side wall of a test piece, multi-point detection can be conducted on the strain force of the test piece, and the defects of a traditional single or low-density sensing layout are overcome; and the completeness and accuracy of experimental data are improved. The upper shell and the lower shell apply confining pressure to the test piece, and the first force application part and the second force application part are matched to apply normal force and shear force, so that a three-dimensional stress field can be effectively simulated; the temperature changing mechanisms in the upper shell and the lower shell, the second test piece and the third test piece are used for detecting dynamic distribution and micro-fracture evolution of sliding friction heat generation, so that coupling monitoring of multiple physical fields such as sound, heat and strain is realized, and a multi-factor interlaced friction instability process under a real geological condition is effectively simulated; and powerful support is provided for deep exploration of geological disasters and engineering activity mechanisms.

Description

Technical Field

[0001] The invention belongs to the technical field of friction and slip testing, and in particular relates to a rock rough interface friction and slip testing device and a testing method. Background Art

[0002] In the field of earth science and engineering geology research, traditional friction and slip experimental equipment has many fundamental defects and can no longer meet the needs of modern scientific research and engineering practice. First, traditional devices generally use a single sensor or a low-density sensor layout. This extensive monitoring method is not only unable to accurately capture the complex non-uniform stress distribution characteristics of natural fracture surfaces, but also makes it difficult to track the dynamic evolution of transient mechanical behavior during slip in real time. Secondly, existing equipment has serious deficiencies in data acquisition frequency and resolution, resulting in a large amount of loss of instantaneous change information of key mechanical parameters (such as friction coefficient, displacement rate, etc.), and the spatiotemporal integrity of experimental data is seriously damaged.

[0003] More critically, the current experimental system faces significant technical bottlenecks in three-dimensional stress field simulation and multi-physics field coupling monitoring. On the one hand, traditional devices are unable to achieve precise control of true triaxial stress conditions, significantly different from the actual geological environment. On the other hand, their ability to simultaneously collect multi-physics signals such as acoustic emission, thermal infrared, and strain fields is severely insufficient, making it difficult to reveal the inherent mechanisms of energy conversion and dissipation during frictional instability. This technical deficiency directly leads to systematic deviations between experimental data and field observations, severely restricting in-depth understanding of key scientific issues such as earthquake precursor characteristics and landslide initiation mechanisms.

[0004] With the rapid advancement of major engineering projects and the increasingly urgent need to prevent and control geological disasters, the limitations of existing experimental equipment have become a key bottleneck restricting the development of the discipline. This is especially true in cutting-edge fields such as shale gas hydraulic fracturing optimization, deep geothermal reservoir reconstruction, and geological disposal of high-level radioactive waste, where the precise quantification of rock interface friction behavior places unprecedented demands.

[0005] Therefore, a rock rough interface friction and slip test device and test method are proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a rock rough interface friction slip test device and test method to solve the above problems.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] A rock rough interface friction and slip test device comprises: a bearing portion, a test assembly is arranged above the bearing portion, and a first force applying portion for applying a normal force to the test assembly and a second force applying portion for applying a shear force to the test assembly are also provided on the bearing portion;

[0009] The test assembly includes a specimen, and a plurality of first test pieces for detecting the strain of the specimen are attached to the outer wall of the specimen. The outer side of the specimen is circumferentially covered with an upper shell and a lower shell. The upper shell is higher than the top end of the specimen, and the lower shell is higher than the bottom end of the specimen. The upper shell and the lower shell both apply confining pressure to the specimen. The upper shell and the lower shell are both provided with temperature changing mechanisms. A plurality of second test pieces and a plurality of third test pieces are both provided on the inner side walls of the upper shell and the lower shell. The second test pieces are used to detect the dynamic distribution of sliding friction heat generation of the specimen, and the third test pieces are used to detect the evolution of micro-fractures during the sliding process of the specimen.

[0010] Preferably, the upper shell and the lower shell have the same structure, a step groove is provided at one end of the upper shell, the step groove is provided along the height direction of the upper shell, an arc block is slidably connected in the step groove, the arc block is fixedly connected to the other end of the upper shell, and the arc block is arranged concentrically with the upper shell;

[0011] A placement groove is circumferentially opened on the outer side wall of the upper shell, and a third force-applying member is circumferentially arranged in the placement groove. One end of the third force-applying member is fixedly connected to a fixed box, and the other end of the third force-applying member passes through the fixed box and is slidably connected to the fixed box. The other end of the third force-applying member is transmission-connected to a power component, and the power component is arranged in the fixed box.

[0012] Preferably, a rotating shaft is rotatably connected in the fixed box, one end of the rotating shaft passes through the fixed box and is fixedly connected to a knob, a turntable is coaxially fixed to the rotating shaft, the turntable is arranged in the fixed box and is perpendicular to the movable end of the third force-applying member, an external thread is provided at the outer edge of the turntable, a plurality of through holes are provided at the movable end of the third force-applying member, and the plurality of through holes are equally spaced along the length direction of the third force-applying member, and the plurality of through holes are all adapted to the external thread.

[0013] Preferably, the temperature changing mechanism includes a heating wire and a heat-conducting tube, and the heating wire and the heat-conducting tube are both buried in the upper shell. The heating wire and the heat-conducting tube are both arranged in a serpentine shape. Both ends of the heating wire pass through the upper shell and are electrically connected to an external power supply device, and both ends of the heat-conducting tube pass through the upper shell and are connected to an external liquid nitrogen supply device.

[0014] Preferably, the upper shell includes a thermal insulation layer and a heat dissipation layer, the heat dissipation layer contacts the outer side wall of the test piece, the placement groove is provided on the thermal insulation layer, two first arc-shaped grooves are provided on one side of the thermal insulation layer, and two second arc-shaped grooves are provided on one side of the heat dissipation layer, the notches of the first arc-shaped grooves and the second arc-shaped grooves are provided correspondingly, and the heating wire / the heat-conducting pipe is provided between the first arc-shaped groove and the second arc-shaped groove;

[0015] The second test piece and the third test piece are both arranged on the side of the heat dissipation layer that contacts the test piece.

[0016] Preferably, the bearing portion includes a bearing plate, and vertically arranged legs are fixedly connected to the four corners of the bottom surface of the bearing plate. The test piece, the first force applying portion and the second force applying portion are all arranged on the top surface of the bearing plate.

[0017] Preferably, a structural reinforcement is fixedly connected to the top surface of the supporting plate, a first curved surface is provided on the top surface of the structural reinforcement, a second curved surface is provided on the bottom surface of the structural reinforcement, the second curved surface is arranged concentrically with the first curved surface, a base is fixedly connected to the center of the top surface of the first curved surface, a sliding groove is provided on the top surface of the base, a slider is slidably connected in the sliding groove, the top end of the slider extends into the lower shell and abuts against the test piece, and a gap is left between the slider and the inner wall of the lower shell.

[0018] Preferably, the first force-applying portion includes a plurality of vertically arranged upright poles, the upright poles being fixedly connected to the top surface of the bearing plate and being equidistantly arranged along the circumferential axis of the structural reinforcement, a horizontally arranged crossbeam being fixedly connected between the top ends of the plurality of upright poles, a second force-applying member being fixedly connected to the top end of the crossbeam, an output end of the second force-applying member passing through the crossbeam and being fixedly connected to a pressure block, the pressure block extending into the upper shell and abutting against the test piece;

[0019] A plurality of ribs are fixedly connected to the bottom surface of the crossbeam, and the plurality of ribs are fixedly connected to the plurality of vertical poles one by one respectively.

[0020] Preferably, the second force-applying portion includes a first force-applying member fixedly connected between two of the vertical rods, the first force-applying member is horizontally arranged, the axis of the first force-applying member is parallel to the slide groove, the output end of the first force-applying member is fixedly connected to a first push block, the first push block is adapted to the lower shell, and the first push block abuts against the lower shell;

[0021] A second push block is abutted against one side of the upper shell, the second push block is adapted to the upper shell, the second push block is arranged opposite to the first push block, and a force-bearing rod is fixedly connected to the side of the second push block away from the upper shell, the force-bearing rod is fixed between two of the vertical rods, and the axis of the force-bearing rod is parallel to the axis of the first force-applying member.

[0022] The rock rough interface friction and slip test method is based on the rock rough interface friction and slip test device, and the steps are as follows:

[0023] A test piece is made, a first test piece is attached to the outside of the test piece, an upper shell and a lower shell are mounted on the outside of the test piece to form a test assembly, the test assembly is placed on the load-bearing part, a confining pressure is applied to the test piece through the upper shell and the lower shell, a normal force is applied to the test piece through the first force-applying part, a shear force is applied to the test piece through the second force-applying part, the ambient temperature is controlled by a temperature-changing mechanism, data of the test piece is measured by the first test piece, the second test piece and the third test piece, and the data is transmitted to an external control system, the collected data is recorded and analyzed by the external control system to obtain test results.

[0024] Compared with the prior art, the present invention has the following advantages and technical effects:

[0025] In the present invention, by attaching multiple first test pieces to the outer wall of the specimen, the strain force of the specimen can be detected at multiple points, changing the shortcomings of traditional single or low-density sensing layouts, accurately capturing the non-uniform stress distribution characteristics of natural fracture surfaces, and dynamically tracking the changes in complex mechanical behavior during the slip process, thereby improving the integrity and accuracy of experimental data. The upper and lower shells apply confining pressure to the specimen, and cooperate with the first and second force-applying parts to apply normal force and shear force, which can effectively simulate the three-dimensional stress field. The temperature-changing mechanisms in the upper and lower shells, as well as the second and third test pieces, respectively detect the dynamic distribution of sliding friction heat and the evolution of microfractures, realizing coupled monitoring of multiple physical fields such as sound, heat, and strain, effectively simulating the friction instability process with multiple factors intertwined under real geological conditions, providing strong support for in-depth exploration of the mechanisms of geological disasters and engineering activities, and meeting the urgent needs for high-precision friction and slip experimental data in fields such as earthquake fault dynamics, shale gas extraction, and deep geothermal energy development. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work.

[0027] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 A top view of the upper housing of the present invention;

[0029] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0030] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0031] Figure 5 Schematic diagram of the structure of the upper shell in the present invention;

[0032] Figure 6 Schematic diagram of the arrangement of the heating wire and the heat pipe in the present invention;

[0033] Among them, 1. support leg; 2. load-bearing plate; 3. structural reinforcement; 4. base; 5. first force-applying member; 6. first push block; 7. force-bearing rod; 8. second push block; 9. vertical pole; 10. crossbeam; 11. rib; 12. second force-applying member; 13. upper shell; 14. lower shell; 15. test piece; 16. strain gauge; 17. third force-applying member; 18. through hole; 19. fixing box; 20. knob; 21. rotating shaft; 22. turntable; 23. external thread; 24. infrared sensor; 25. acoustic emission sensor; 26. heating wire; 27. heat pipe; 28. groove; 29. ​​arc block; 30. slider; 1301. thermal insulation layer; 1302. heat dissipation layer; 1303. placement groove; 1304. first arc groove; 1305. second arc groove. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figures 1 to 6 The present invention discloses a rock rough interface friction and slip test device, comprising: a bearing portion, a test assembly is arranged above the bearing portion, and a first force applying portion for applying a normal force to the test assembly and a second force applying portion for applying a shear force to the test assembly are further arranged on the bearing portion;

[0037] The test assembly includes a specimen 15, on the outer wall of which are attached a plurality of first test pieces for detecting the strain of the specimen 15. The outer side of the specimen 15 is circumferentially covered with an upper shell 13 and a lower shell 14. The upper shell 13 is higher than the top end of the specimen 15, and the lower shell 14 is higher than the bottom end of the specimen 15. Both the upper shell 13 and the lower shell 14 apply confining pressure to the specimen 15. Both the upper shell 13 and the lower shell 14 are provided with temperature changing mechanisms. Both the upper shell 13 and the lower shell 14 are provided with a plurality of second test pieces and a plurality of third test pieces on the inner side walls. The second test pieces are used to detect the dynamic distribution of sliding friction heat generation of the test specimen 15, and the third test pieces are used to detect the evolution of micro-fractures during the sliding process of the test specimen 15.

[0038] The first test piece is the strain gauge 16 , the second test piece is the infrared sensor 24 , and the third test piece is the acoustic emission sensor 25 .

[0039] Further optimized, the upper shell 13 and the lower shell 14 have the same structure, and a step groove 28 is opened at one end of the upper shell 13. The step groove 28 is opened along the height direction of the upper shell 13. An arc block 29 is slidably connected in the step groove 28. The arc block 29 is fixedly connected to the other end of the upper shell 13 and is arranged concentrically with the upper shell 13.

[0040] A placement groove 1303 is circumferentially opened on the outer wall of the upper shell 13, and a third force-applying member 17 is circumferentially arranged inside the placement groove 1303. One end of the third force-applying member 17 is fixedly connected to the fixed box 19, and the other end of the third force-applying member 17 passes through the fixed box 19 and is slidably connected to the fixed box 19. The other end of the third force-applying member 17 is transmission-connected to a power component, and the power component is arranged in the fixed box 19.

[0041] A further optimized solution is that a rotating shaft 21 is rotatably connected in the fixed box 19, one end of the rotating shaft 21 passes through the fixed box 19 and is fixedly connected to a knob 20, and a turntable 22 is coaxially fixed to the rotating shaft 21. The turntable 22 is arranged in the fixed box 19 and is perpendicular to the movable end of the third force-applying member 17. An external thread 23 is provided at the outer edge of the turntable 22, and a plurality of through holes 18 are provided at the movable end of the third force-applying member 17. The plurality of through holes 18 are equally spaced along the length direction of the third force-applying member 17, and the plurality of through holes 18 are all adapted to the external thread 23.

[0042] The knob 20 is rotated by a torque wrench, and the knob 20 drives the rotary disk 22 to rotate via the rotating shaft 21 , thereby contracting the third force applying member 17 , driving the upper shell 13 / the lower shell 14 to contract, and thus applying confining pressure to the test piece 15 .

[0043] The third force applying member 17 is a steel belt.

[0044] A further optimized solution is provided, in which the temperature changing mechanism includes a heating wire 26 and a heat pipe 27. The heating wire 26 and the heat pipe 27 are both buried in the upper shell 13. The heating wire 26 and the heat pipe 27 are both arranged in a serpentine shape. Both ends of the heating wire 26 pass through the upper shell 13 and are electrically connected to an external power supply device. Both ends of the heat pipe 27 pass through the upper shell 13 and are connected to an external liquid nitrogen supply device.

[0045] In a further optimized solution, the upper housing 13 includes a thermal insulation layer 1301 and a heat dissipation layer 1302. The heat dissipation layer 1302 contacts the outer wall of the test piece 15. The placement groove 1303 is provided on the thermal insulation layer 1301. Two first arcuate grooves 1304 are provided on one side of the thermal insulation layer 1301, and two second arcuate grooves 1305 are provided on one side of the heat dissipation layer 1302. The notches of the first arcuate grooves 1304 and the second arcuate grooves 1305 are provided correspondingly. The heating wire 26 / heat conducting tube 27 is provided between the first arcuate groove 1304 and the second arcuate groove 1305.

[0046] The second test piece and the third test piece are both arranged on the side where the heat dissipation layer 1302 contacts the test piece 15 .

[0047] According to a further optimized solution, the bearing part includes a bearing plate 2 , and vertically arranged legs 1 are fixedly connected to the four corners of the bottom surface of the bearing plate 2 . The test piece 15 , the first force-applying part and the second force-applying part are all arranged on the top surface of the bearing plate 2 .

[0048] A further optimized solution is that the top surface of the load-bearing plate 2 is fixedly connected with a structural reinforcement 3, the top surface of the structural reinforcement 3 is provided with a first curved surface, the bottom surface of the structural reinforcement 3 is provided with a second curved surface, the second curved surface is arranged concentrically with the first curved surface, a base 4 is fixedly connected at the center of the top surface of the first curved surface, a slide groove is provided on the top surface of the base 4, a slider 30 is slidably connected in the slide groove, the top end of the slider 30 extends into the lower shell 14 and abuts against the test piece 15, and a gap is left between the slider 30 and the inner wall of the lower shell 14.

[0049] Further optimized, the first force-applying part includes a plurality of vertically arranged uprights 9, which are fixed to the top surface of the bearing plate 2 and are arranged at equal intervals along the circumferential direction of the axis of the structural reinforcement 3. A horizontally arranged crossbeam 10 is fixed between the top ends of the plurality of uprights 9, and a second force-applying member 12 is fixed to the top end of the crossbeam 10. The output end of the second force-applying member 12 passes through the crossbeam 10 and is fixed to a pressure block, which extends into the upper shell 13 and abuts against the test piece 15.

[0050] A plurality of ribs 11 are fixedly connected to the bottom surface of the cross beam 10 , and the plurality of ribs 11 are fixedly connected to the plurality of vertical poles 9 one by one.

[0051] In a further optimized solution, the second force-applying portion includes a first force-applying member 5 fixedly connected between two of the vertical rods 9. The first force-applying member 5 is horizontally arranged, and the axis of the first force-applying member 5 is arranged parallel to the slide groove. The output end of the first force-applying member 5 is fixedly connected to a first push block 6, which is adapted to the lower shell 14 and abuts against the lower shell 14.

[0052] A second push block 8 is abutted against one side of the upper shell 13, and the second push block 8 is adapted to the upper shell 13. The second push block 8 is arranged opposite to the first push block 6. A force-bearing rod 7 is fixedly connected to the side of the second push block 8 away from the upper shell 13. The force-bearing rod 7 is fixed between two of the vertical rods 9, and the axis of the force-bearing rod 7 is parallel to the axis of the first force-applying member 5.

[0053] The first force applying member 5 and the second force applying member 12 are both hydraulic rods.

[0054] The rock rough interface friction and slip test method is based on the rock rough interface friction and slip test device, and the steps are as follows:

[0055] A test piece 15 is manufactured, a first test piece is attached to the outside of the test piece 15, an upper shell 13 and a lower shell 14 are mounted on the outside of the test piece 15 to form a test assembly, the test assembly is placed on the load-bearing portion, a confining pressure is applied to the test piece 15 through the upper shell 13 and the lower shell 14, a normal force is applied to the test piece 15 through the first force-applying portion, a shear force is applied to the test piece 15 through the second force-applying portion, the ambient temperature is controlled by a temperature-changing mechanism, data of the test piece 15 is measured by the first test piece, the second test piece and the third test piece, and the data is transmitted to an external control system, the collected data is recorded and analyzed by the external control system to obtain test results.

[0056] Specific experimental methods:

[0057] A low-temperature freezing sampling method was used to extract natural fracture cores to avoid mechanical disturbance. The fracture surface morphology was scanned by 3D laser, and the roughness error of the natural fracture surface was reproduced with a precision of ≤5μm. The surface morphology point cloud data was generated with an accuracy of 0.01mm. A bionic fracture surface mold was made by light-curing 3D printing technology, and an epoxy resin-quartz sand composite material was poured into the mold to form a specimen 15. The size of the specimen 15 was 100mm×100mm×50mm, and the fracture surface inclination angle was 30°~60°. Strain gauges 16 were attached to the surface of the specimen 15. Some strain gauges 16 were attached along the fracture surface, and the other strain gauges 16 were attached along the fracture surface. Near the top and bottom ends of the test piece 15, an upper shell 13 and a lower shell 14 are sleeved on the outside of the test piece 15 to form a test assembly. The test assembly is placed above the base 4, and the slider 30 is inserted into the lower shell 14 and abuts against the test piece 15. The second force-applying member 12 is activated, and the second force-applying member 12 drives the pressure block to move downward. The pressure block extends into the upper shell 13 and abuts against the top of the test piece 15, applying a specified pressure to the test piece 15. The first force-applying member 5 applies a horizontal shear force to the test piece 15. The test piece 15 is heated by the electric heating wire 26 or liquid nitrogen is introduced into the heat pipe 27. The test environment temperature is adjusted and the test is carried out until macroscopic slip occurs.

[0058] The stress change data of the specimen 15 during the experiment is obtained through the strain gauge 16, the temperature change and temperature distribution data of the specimen 15 during the experiment are obtained through the infrared sensor 24, and the micro-fracture evolution data of the specimen 15 during the experiment is obtained through the acoustic emission sensor 25. All data are transmitted to the external control system, and the data is recorded and analyzed by the external control system to obtain the experimental results.

[0059] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are 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 understood as limiting the present invention.

[0060] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. Rock rough interface friction and slip test device, characterized by: include: A load-bearing portion, a test assembly is disposed above the load-bearing portion, and a first force-applying portion for applying a normal force to the test assembly and a second force-applying portion for applying a shear force to the test assembly are further disposed on the load-bearing portion; The test assembly comprises a test piece (15), a plurality of first test pieces for detecting the strain force of the test piece (15) are attached to the outer wall of the test piece (15), an upper shell (13) and a lower shell (14) are circumferentially covered on the outer side of the test piece (15), the upper shell (13) and the lower shell (14), the upper shell (13) is higher than the top end of the test piece (15), the lower shell (14) is higher than the bottom end of the test piece (15), and the upper shell (13) is The lower shell (14) applies a confining pressure to the test piece (15), the upper shell (13) and the lower shell (14) are both provided with a temperature changing mechanism, and the inner side walls of the upper shell (13) and the lower shell (14) are both provided with a plurality of second test pieces and a plurality of third test pieces, the second test pieces are used to detect the dynamic distribution of sliding friction heat generation of the test piece (15), and the third test pieces are used to detect the evolution of micro-fractures during the sliding process of the test piece (15).

2. The rock rough interface friction and slip test device according to claim 1, characterized in that: The upper shell (13) and the lower shell (14) have the same structure. A step groove (28) is provided at one end of the upper shell (13). The step groove (28) is provided along the height direction of the upper shell (13). An arc block (29) is slidably connected in the step groove (28). The arc block (29) is fixedly connected to the other end of the upper shell (13). The arc block (29) and the upper shell (13) are arranged concentrically. A placement groove (1303) is circumferentially provided on the outer side wall of the upper shell (13), and a third force-applying member (17) is circumferentially provided inside the placement groove (1303). One end of the third force-applying member (17) is fixedly connected to a fixed box (19), and the other end of the third force-applying member (17) passes through the fixed box (19) and is slidably connected to the fixed box (19). The other end of the third force-applying member (17) is transmission-connected to a power assembly, and the power assembly is arranged in the fixed box (19).

3. The rock rough interface friction and slip test device according to claim 2, characterized in that: A rotating shaft (21) is rotatably connected in the fixed box (19), one end of the rotating shaft (21) passes through the fixed box (19) and is fixedly connected to a knob (20), a turntable (22) is coaxially fixed to the rotating shaft (21), the turntable (22) is arranged in the fixed box (19) and is perpendicular to the movable end of the third force-applying member (17), an external thread (23) is provided at the outer edge of the turntable (22), a plurality of through holes (18) are provided at the movable end of the third force-applying member (17), and the plurality of through holes (18) are arranged at equal intervals along the length direction of the third force-applying member (17), and the plurality of through holes (18) are all adapted to the external thread (23).

4. The rock rough interface friction and slip test device according to claim 2, characterized in that: The temperature changing mechanism includes a heating wire (26) and a heat conducting tube (27), both of which are buried in the upper shell (13). Both of the heating wire (26) and the heat conducting tube (27) are arranged in a serpentine shape. Both ends of the heating wire (26) pass through the upper shell (13) and are electrically connected to an external power supply device, and both ends of the heat conducting tube (27) pass through the upper shell (13) and are connected to an external liquid nitrogen supply device.

5. The rock rough interface friction and slip test device according to claim 4, characterized in that: The upper shell (13) includes a heat insulation layer (1301) and a heat dissipation layer (1302), the heat dissipation layer (1302) contacts the outer wall of the test piece (15), the placement groove (1303) is opened on the heat insulation layer (1301), two first arc-shaped grooves (1304) are opened on one side of the heat insulation layer (1301), and two second arc-shaped grooves (1305) are opened on one side of the heat dissipation layer (1302), the notches of the first arc-shaped groove (1304) and the second arc-shaped groove (1305) are correspondingly arranged, and the heating wire (26) / the heat conduction pipe (27) is arranged between the first arc-shaped groove (1304) and the second arc-shaped groove (1305); The second test piece and the third test piece are both arranged on the side of the heat dissipation layer (1302) in contact with the test piece (15).

6. The rock rough interface friction and slip test device according to claim 1, characterized in that: The bearing portion comprises a bearing plate (2), the four corners of the bottom surface of the bearing plate (2) are fixedly connected with vertically arranged supporting legs (1), and the test piece (15), the first force-applying portion and the second force-applying portion are all arranged on the top surface of the bearing plate (2).

7. The rock rough interface friction and slip test device according to claim 6, characterized in that: The top surface of the supporting plate (2) is fixedly connected to a structural reinforcement (3), the top surface of the structural reinforcement (3) is provided with a first arcuate surface, the bottom surface of the structural reinforcement (3) is provided with a second arcuate surface, the second arcuate surface is arranged concentrically with the first arcuate surface, a base (4) is fixedly connected at the center of the top surface of the first arcuate surface, the top surface of the base (4) is provided with a slide groove, a slider (30) is slidably connected in the slide groove, the top end of the slider (30) extends into the lower shell (14) and abuts against the test piece (15), and a gap is left between the slider (30) and the inner side wall of the lower shell (14).

8. The rock rough interface friction and slip test device according to claim 7, characterized in that: The first force-applying part comprises a plurality of vertically arranged upright poles (9), the upright poles (9) being fixedly connected to the top surface of the bearing plate (2) and being arranged at equal intervals along the circumferential axis of the structural reinforcement (3), a horizontally arranged crossbeam (10) being fixedly connected between the top ends of the plurality of upright poles (9), a second force-applying member (12) being fixedly connected to the top end of the crossbeam (10), an output end of the second force-applying member (12) passing through the crossbeam (10) and being fixedly connected to a pressure block, the pressure block extending into the upper shell (13) and abutting against the test piece (15); A plurality of ribs (11) are fixedly connected to the bottom surface of the crossbeam (10), and the plurality of ribs (11) are respectively fixedly connected to the plurality of vertical poles (9).

9. The rock rough interface friction and slip test device according to claim 8, characterized in that: The second force-applying portion includes a first force-applying member (5) fixedly connected between two of the vertical rods (9), the first force-applying member (5) is horizontally arranged, the axis of the first force-applying member (5) is arranged parallel to the slide groove, the output end of the first force-applying member (5) is fixedly connected to a first push block (6), the first push block (6) is adapted to the lower shell (14), and the first push block (6) abuts against the lower shell (14); A second push block (8) is abutted against one side of the upper shell (13), and the second push block (8) is adapted to the upper shell (13). The second push block (8) is arranged opposite to the first push block (6). A force-bearing rod (7) is fixedly connected to the side of the second push block (8) away from the upper shell (13). The force-bearing rod (7) is fixed between two of the vertical rods (9), and the axis of the force-bearing rod (7) is parallel to the axis of the first force-applying member (5).

10. A rock rough interface friction and slip test method, based on the rock rough interface friction and slip test device according to any one of claims 1 to 9, characterized in that: Here are the steps: A test piece (15) is manufactured, a first test piece is attached to the outside of the test piece (15), an upper shell (13) and a lower shell (14) are sleeved on the outside of the test piece (15) to form a test assembly, the test assembly is placed on a bearing portion, a confining pressure is applied to the test piece (15) through the upper shell (13) and the lower shell (14), a normal force is applied to the test piece (15) through a first force-applying portion, a shear force is applied to the test piece (15) through a second force-applying portion, an ambient temperature is controlled through a temperature-changing mechanism, data of the test piece (15) is measured through the first test piece, the second test piece and the third test piece, and the data is transmitted to an external control system, the collected data is recorded and analyzed through the external control system to obtain a test result.

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