Vibration-based rock mass structural surface friction characteristic size effect tester

Abstract

The invention provides a rock mass structural surface friction characteristic size effect tester based on vibration. The rock mass structural surface friction characteristic size effect tester comprises a workbench seat, a horizontal vibration loading device, a vertical vibration loading device and a control system, a mounting bottom plate and a shock pad are arranged on the top of the workbench base; the horizontal vibration loading device comprises a horizontal vibration loader, a horizontal vibration table, a horizontal guide rail, a limiting part, a horizontal force measuring sensor and a horizontal displacement sensor; the vertical vibration loading device comprises a vertical vibration loader, a support frame, a clamping part, a vertical guide part and a vertical force transducer; and the control system is used for controlling the operation of the horizontal vibration loading device and the vertical vibration loading device and outputting test data. According to the tester, the sample is limited and guided, and the test stability and the test precision are improved.

Description

Technical Field

[0001] The invention relates to the technical field of rock material friction property test instruments, in particular to a vibration-based rock structure surface friction property size effect test instrument. Background Art

[0002] Structural planes are common in rock mass in nature. Their development characteristics and distribution patterns control the properties of rock mass to a large extent and are the main reasons for the inhomogeneity and anisotropy of rock mass. Its stability affects the safety of engineering construction. Due to the influence of factors such as earthquakes, vibration caused by excavation, and friction between surrounding rock and lining, the friction characteristics of rock structural planes under vibration conditions have received attention from the academic community, while the influence of the size effect of friction characteristics needs to be further studied.

[0003] Test instruments are the basis for studying the friction mechanism of rock structure surfaces. In order to understand the friction characteristics under vibration conditions, some scholars are also studying related equipment. For example, Patent No. 202010025315.7 proposes a vibration measurement method for high-frequency friction of rock interfaces, but there is no limit on the upper sample, and no specific solution is given for how to achieve vertical loading. The vibration path using remote force transmission is too large, and the influence of size effect is not considered; Patent No. 201910783778.7 proposes a dynamic friction system for rock structure surfaces based on dual vibration tables. It uses two vibration tables and a normal high stress, but the upper test block fixing groove is fixed to the frame on the outside, which limits its up and down movement. There is no specific solution for how to achieve vibration and sample constraint; Patent No. 202210221186.8 proposes a multi-directional dynamic shear mechanics test system for rock structure surface based on the principle of a vibration table, which realizes the translation of the lower sample along the x and y axes and the rotation around the z axis, simulating the force characteristics of the sample under multi-directional earthquake action, but vertical vibration cannot be applied. The limiter is only limited to prevent lateral displacement. When the rock structure surface has a large undulation, it is difficult to meet the requirements. The upper plate sample cannot meet the vertical limited movement. In addition, the size of the shear box is changed in a combined manner to accommodate samples of different sizes. The vibration transmission path is complex and it is difficult to observe the surface condition of the sample, and the relationship between friction and sample size cannot be effectively obtained. In order to explore the mechanism of the size effect of friction characteristics, it is a prerequisite to obtain the friction of multi-sized samples under horizontal and vertical vibrations with high precision. Therefore, it is urgent to provide high-precision and efficient test equipment and solutions. Summary of the invention

[0004] In order to overcome the above defects of the prior art, the present invention provides a vibration-based rock structure surface friction characteristic size effect tester.

[0005] The present invention provides a vibration-based rock structure surface friction characteristic size effect tester, comprising a workbench, a horizontal vibration loading device, a vertical vibration loading device and a control system; a mounting base and a shock-absorbing pad are provided on the top of the workbench, the shock-absorbing pad is arranged between the workbench and the mounting base, the mounting base is used for supporting the horizontal vibration loading device, and the vertical vibration loading device is installed on the workbench; the horizontal vibration loading device comprises a horizontal vibration loader, a horizontal vibration table, a horizontal guide rail, a limit part, a horizontal force sensor and a horizontal displacement sensor, the horizontal vibration table is slidably arranged on the horizontal guide rail, the horizontal guide rail is fixedly connected to the mounting base, the horizontal vibration loader is installed on the mounting base and is used to drive the horizontal vibration table to reciprocate horizontally on the horizontal guide rail, the horizontal force sensor is arranged between the horizontal vibration loader and the horizontal vibration table, and the horizontal displacement sensor is provided between the horizontal vibration loader and the horizontal vibration table. The limit part is installed on the horizontal vibration table, and the limit part is used to fix the lower sample on the table surface of the horizontal vibration table. The horizontal displacement sensor is installed on the installation base and is used to detect the horizontal displacement distance of the horizontal vibration table; the vertical vibration loading device includes a vertical vibration loader, a support frame, a clamping part, a vertical guide part and a vertical force sensor, the support frame is fixed on the workbench, the clamping part is installed on the support frame and is used to clamp the upper sample above the lower sample, the vertical guide part is installed on the clamping part and is used to provide vertical guidance for the upper sample, the vertical vibration loader is installed on the support frame, the vertical vibration loader is used to drive the upper sample to squeeze and load the lower sample, and the vertical force sensor is arranged on the vertical output end of the vertical vibration loader; the control system is used to control the operation of the horizontal vibration loading device and the vertical vibration loading device and output test data.

[0006] Compared with the prior art, the vibration-based rock structure surface friction characteristic size effect tester of the present application has the following advantages: a mounting base is arranged on the workbench to provide stable and reliable support for the horizontal vibration loading device, the vertical vibration loading device is installed on the workbench to avoid interference with the horizontal vibration loading device, and the shock-absorbing pad buffers vibration to improve the test stability; by arranging a horizontal guide rail, the horizontal vibration table has a horizontal movement guide to improve the horizontal vibration stability of the lower sample, and a limit part is arranged to improve the setting stability of the lower sample on the horizontal vibration table; by arranging a clamping part, the clamping stability of the upper sample is improved, and at the same time a vertical guide part is arranged to provide guidance for the vertical vibration of the upper sample, thereby improving the vertical vibration stability of the upper sample.

[0007] In a possible embodiment, the horizontal vibration loader includes a motor, a screw, a nut and two support seats, the two support seats are fixedly connected to the mounting base and are arranged at intervals in the horizontal direction, the two ends of the screw are rotatably set on the two support seats, the nut is threadedly sleeved on the screw and connected to the horizontal vibration table, the motor is installed on the mounting base, and the output shaft of the motor is connected to the screw through a coupling.

[0008] Compared with the prior art, the above technical solution can realize horizontal vibration loading, has a reliable structure, and improves the stability of horizontal vibration loading.

[0009] In a possible embodiment, the horizontal vibration table includes a loading plate, a movable support leg and a traction plate, the movable support leg having four legs and fixedly connected to the bottom of the loading plate, a horizontal movable slider is provided at the bottom of the four movable supports, the horizontal movable slider is slidably connected to a horizontal guide rail, the traction plate is fixedly arranged on the loading plate, and the traction plate is connected to a nut through a horizontal force sensor.

[0010] Compared with the prior art, the above technical solution can realize the horizontal reciprocating movement of the horizontal vibration table and improve the stability of horizontal vibration loading.

[0011] In a possible implementation, two limit seats are provided on the loading plate, the two limit seats are spaced apart, and pressure plates are provided on the two limit seats through screws, and the two pressure plates are used to squeeze and limit the lower sample.

[0012] Compared with the prior art, the above technical solution can achieve the fixation of the lower sample on the loading plate and improve the stability of horizontal vibration loading.

[0013] In a possible implementation, the support frame includes a top plate and four columns arranged at the bottom of the top plate, the four columns are arranged at intervals around the circumference and fixedly connected to the workbench, and a supporting connecting rod is provided between two adjacent columns.

[0014] Compared with the prior art, the above technical solution can achieve reliable support of the support frame and improve the stability of vertical vibration loading.

[0015] In a possible embodiment, the clamping part includes a left clamping assembly and a right clamping assembly, the left clamping assembly is arranged on two columns, and the right clamping assembly is arranged on the other two columns, the left clamping assembly and the right clamping assembly are relatively arranged for clamping the upper sample, and the right clamping assembly includes a support frame, a guide rod, a threaded rod, a movable plate, a support plate and a clamping plate, the support frame is connected between the two columns along a vertical sliding adjustment, the threaded rod is screwed to the support frame along a horizontal movement, the movable plate is connected to the inner end of the threaded rod, and a handwheel is provided at the outer end of the threaded rod, the guide rod is slidably arranged on the support frame along a horizontal direction and is fixedly connected to the movable plate, the support plate is connected to the side of the movable plate away from the threaded rod, and the clamping plate is connected to the side of the support plate away from the movable plate.

[0016] Compared with the prior art, the above technical solution can achieve reliable clamping of the upper sample and improve the stability of vertical vibration loading. The support frame is adjusted along the vertical sliding direction, which is conducive to the clamping of samples of different sizes and convenient for the use of the equipment.

[0017] In a possible implementation, the clamping portion further includes a pressure sensor for detecting the pressure of the clamping plate, and the pressure sensor is connected between the moving plate and the supporting plate.

[0018] Compared with the prior art, the above technical solution can detect the clamping force of the clamping plate on the upper sample, reduce the influence of the clamping force on the vertical vibration loading, and improve the test accuracy.

[0019] In a possible implementation, the vertical guide portion includes a vertical guide rail and a vertical movable slider, the vertical guide rail is fixedly connected to the support plate, and the vertical movable slider is slidably disposed on the vertical guide rail and fixedly connected to the clamping plate.

[0020] Compared with the prior art, the above technical solution can achieve vertical guidance of the upper sample and improve the stability of vertical vibration loading.

[0021] In a possible implementation, the vertical vibration loader includes a vibration cylinder, a ball joint and a vertical loading plate, the vibration cylinder is fixedly mounted on the top plate, the ball joint is connected to the output end of the vibration cylinder, the vertical loading plate is connected to the ball joint, and the vertical force sensor is provided between the ball joint and the output end of the vibration cylinder.

[0022] Compared with the prior art, the above technical solution can realize vertical vibration loading, has a reliable structure, and improves the stability of vertical vibration loading.

[0023] In one possible implementation, the control system includes a power oil source, an operating end, a controller and a computer software end. The power oil source provides output power for the horizontal vibration loader and the vertical vibration loader. The operating end, the controller and the computer software end provide control and interface operations for the test.

[0024] Compared with the prior art, the above technical solution can realize the control of the instrument and improve the detection automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a partial structural diagram of the present invention. Figure 1 ; Figure 3 for Figure 2 A front view of Figure 4 It is a partial structural diagram of the present invention. Figure 2 ; Figure 5 for Figure 4 A front view of Figure 6 for Figure 4 sectional view of Figure 7 It is a partial structural diagram of the present invention. Figure 3 ; Figure 8 for Figure 7 A front view of Fig. 9 The structure diagram of the right clamping assembly Figure 1 ; Fig.10 The structure diagram of the right clamping assembly Figure 2 ; Description of reference numerals: 1. Workbench seat; 11. Mounting base plate; 12. Shock-absorbing pad; 2. Horizontal vibration loading device; 21. Horizontal vibration loader; 211. Motor; 212. Screw; 213. Nut; 214. Support seat; 215. Coupling; 22. Horizontal vibration table; 221. Loading plate; 222. Moving support foot; 223. Traction plate; 224. Horizontal moving slider; 23. Horizontal guide rail; 24. Limiting part; 241. Limiting seat; 242. Pressing plate; 25. Horizontal force sensor; 26. Horizontal displacement sensor; 3. Vertical vibration loading device; 31. Vertical vibration loader; 311. Vibration cylinder; 312. Ball joint; 31 3. Vertical loading plate; 32. Support frame; 321. Top plate; 322. Column; 323. Support connecting rod; 33. Clamping part; 331. Left clamping assembly; 332. Right clamping assembly; 3321. Support frame; 3322. Guide rod; 3323. Threaded rod; 3324. Moving plate; 3325. Support plate; 3326. Clamping plate; 3327. Hand wheel; 333. Pressure sensor; 34. Vertical guide part; 341. Vertical guide rail; 342. Vertical moving slider; 35. Vertical force sensor; 4. Power oil source; 5. Operation end; 6. Controller; 7. Computer software end; 10. Lower specimen; 20. Upper specimen. DETAILED DESCRIPTION

[0026] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0027] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0028] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] See also Figures 1 to 10 The embodiment of the present application discloses a vibration-based rock structure surface friction characteristic size effect tester, comprising a workbench 1, a horizontal vibration loading device 2, a vertical vibration loading device 3 and a control system; a mounting base 11 and a shock-absorbing pad 12 are provided on the top of the workbench 1, the shock-absorbing pad 12 is arranged between the workbench 1 and the mounting base 11, the mounting base 11 is used to support the horizontal vibration loading device 2, and the vertical vibration loading device 3 is installed on the workbench 1; the horizontal vibration loading device 2 comprises A horizontal vibration loader 21, a horizontal vibration table 22, a horizontal guide rail 23, a limiter 24, a horizontal force sensor 25 and a horizontal displacement sensor 26. The horizontal vibration table 22 is slidably arranged on the horizontal guide rail 23. The horizontal guide rail 23 is fixedly connected to the mounting base 11. The horizontal vibration loader 21 is mounted on the mounting base 11 and is used to drive the horizontal vibration table 22 to reciprocate horizontally on the horizontal guide rail 23. The horizontal force sensor 25 is arranged between the horizontal vibration loader 21 and the horizontal vibration table 22. The limiter 24 is installed on the horizontal vibration table 22, and the limiter 24 is used to fix the lower sample 10 on the table surface of the horizontal vibration table 22. The horizontal displacement sensor 26 is installed on the mounting base 11 and is used to detect the horizontal displacement distance of the horizontal vibration table 22; the vertical vibration loading device 3 includes a vertical vibration loader 31, a support frame 32, a clamping portion 33, a vertical guide portion 34 and a vertical force sensor 35, the support frame 32 is fixed on the workbench 1, and the clamping portion 33 is installed on the support frame 32 It is used to clamp the upper sample 20 above the lower sample 10. The vertical guide part 34 is installed on the clamping part 33 and is used to provide vertical guidance for the upper sample 20. The vertical vibration loader 31 is installed on the supporting frame 32. The vertical vibration loader 31 is used to drive the upper sample 20 to squeeze and load the lower sample 10. The vertical force sensor 35 is arranged on the vertical output end of the vertical vibration loader 31. The control system is used to control the operation of the horizontal vibration loading device 2 and the vertical vibration loading device 3 and output test data.

[0031] Continue to see Figure 4 , Figure 5 and Figure 6In this embodiment, the horizontal vibration loader 21 includes a motor 211, a screw 212, a nut 213 and two support seats 214. The two support seats 214 are fixedly connected to the mounting base 11 and are arranged at intervals in the horizontal direction. The two ends of the screw 212 are rotatably arranged on the two support seats 214. The nut 213 is threadedly sleeved on the screw 212 and connected to the horizontal vibration table 22. The motor 211 is installed on the mounting base 11. The output shaft of the motor 211 is connected to the screw 212 through a coupling 215, thereby realizing horizontal vibration loading, having a reliable structure, and improving the stability of horizontal vibration loading. The motor 211 is a private service motor 211, which improves the movement accuracy of the nut 213.

[0032] In this embodiment, the horizontal vibration table 22 includes a loading plate 221, a movable support leg 222 and a traction plate 223. The movable support leg 222 has four and is fixedly connected to the bottom of the loading plate 221. The bottom of the four movable support legs 222 is provided with a horizontal movable slider 224. The horizontal movable slider 224 is slidably connected to the horizontal guide rail 23. The traction plate 223 is fixedly set on the loading plate 221. The traction plate 223 is connected to the nut 213 through a horizontal force sensor 25, thereby enabling the horizontal reciprocating movement of the horizontal vibration table 22 to be realized, thereby improving the stability of the horizontal vibration loading.

[0033] In this embodiment, two limit seats 241 are provided on the carrier plate 221, and the two limit seats 241 are arranged at intervals. The two limit seats 241 are provided with pressure plates 242 through screws. The two pressure plates 242 are used to squeeze and limit the lower sample 10, thereby achieving the fixation of the lower sample 10 on the carrier plate 221 and improving the stability of horizontal vibration loading.

[0034] Continue to see Figure 7 , Figure 8 , Fig. 9 and Fig.10 In this embodiment, the support frame 32 includes a top plate 321 and four columns 322 arranged at the bottom of the top plate 321. The four columns 322 are arranged at intervals around the circumference and fixedly connected to the workbench 1. A support link 323 is provided between two adjacent columns 322, thereby achieving reliable support of the support frame 32 and improving the stability of vertical vibration loading. Sensors such as LVDT for measuring mechanical parameters of the sample are installed on the support link 323 to assist in mechanical parameter measurement.

[0035] In this embodiment, the clamping portion 33 includes a left clamping component 331 and a right clamping component 332, wherein the left clamping component 331 is disposed on two upright posts 322, and the right clamping component 332 is disposed on the other two upright posts 322, wherein the left clamping component 331 and the right clamping component 332 are relatively arranged to clamp the upper sample 20, wherein the right clamping component 332 includes a support frame 3321, a guide rod 3322, a threaded rod 3323, a movable plate 3324, a support plate 3325 and a clamping plate 3326, wherein the support frame 3321 is connected between the two upright posts 322 along a vertical sliding adjustment, and the threaded rod 3323 is screwed to the support frame 332 along a horizontal movement direction. 1, the movable plate 3324 is connected to the inner end of the threaded rod 3323, and the outer end of the threaded rod 3323 is provided with a hand wheel 3327, the guide rod 3322 is slidably arranged on the support frame 3321 in the horizontal direction and is fixedly connected to the movable plate 3324, the support plate 3325 is connected to the side of the movable plate 3324 away from the threaded rod 3323, and the clamping plate 3326 is connected to the side of the support plate 3325 away from the movable plate 3324, thereby achieving reliable clamping of the upper sample 20 and improving the stability of vertical vibration loading, and the support frame 3321 is arranged along the vertical sliding adjustment, which is conducive to the clamping of samples 20 of different sizes and convenient for the use of the equipment. The clamping part 33 also includes a pressure sensor 333 for detecting the pressure of the clamping plate 3326. The pressure sensor 333 is connected between the moving plate 3324 and the supporting plate 3325, that is, it can detect the clamping force of the clamping plate 3326 on the upper sample 20, reduce the influence of the clamping force on the vertical vibration loading, and improve the test accuracy. The left clamping assembly 331 and the right clamping assembly 332 have the same structure. The support frame 3321 is provided with a through hole, and the through hole is for the column 322 to penetrate and slide with each other. The support frame 3321 is provided with a locking screw, and the support frame 3321 is fixed to the column 322 by the locking screw.

[0036] In this embodiment, the vertical guide portion 34 includes a vertical guide rail 341 and a vertical movable slider 342. The vertical guide rail 341 is fixedly connected to the support plate 3325, and the vertical movable slider 342 is slidably set on the vertical guide rail and fixedly connected to the clamping plate 3326, thereby realizing vertical guiding of the upper sample 20 and improving the stability of vertical vibration loading.

[0037] In this embodiment, the vertical vibration loader 31 includes a vibration cylinder 311, a ball joint 312 and a vertical loading plate 313. The vibration cylinder 311 is fixedly mounted on the top plate 321, the ball joint 312 is connected to the output end of the vibration cylinder 311, and the vertical loading plate 313 is connected to the ball joint 312. The vertical force sensor 35 is provided between the ball joint 312 and the output end of the vibration cylinder 311, thereby realizing vertical vibration loading, having a reliable structure, and improving the stability of vertical vibration loading.

[0038] Continue to see Figure 1 In this embodiment, the control system includes a power oil source 4, an operating terminal 5, a controller 6 and a computer software terminal 7. The power oil source 4 provides output power for the horizontal vibration loader 21 and the vertical vibration loader 31. The operating terminal 5, the controller 6 and the computer software terminal 7 provide control and interface operations for the test, thereby realizing the control of the instrument and improving the detection automation.

[0039] This embodiment provides a method for using a vibration-based rock mass structural surface friction characteristic size effect tester, comprising the following steps: Step 1, install the sample: according to the scale and coordinates of the horizontal vibration table 22, install the lower sample 10 in the middle position of the horizontal vibration table 22, use two limit seats 241 to fix the two ends of the sample on the horizontal vibration table 22 respectively, based on the reaction support of the fixed limit seats 241, use screws to clamp the lower sample 10 with the pressing plate 242, and install the upper sample 20 above the lower sample 10. The initial state is that the structural surfaces overlap, and adjust the left clamping assembly 331 and the right clamping assembly 332 so that the clamping plate 3326 clamps the upper sample 20; Step 2: Preparation before testing: Install auxiliary measuring tools, start the oil source, operation terminal 5, computer software terminal 7 and controller 6, and check whether there are any abnormalities; Step 3, equipment trial operation: start the vertical vibration loader 31, set low-frequency vibration or pressure-maintaining loading, check the operation data, reset if it runs normally, lift the upper sample 20 upward for a short distance so that the structural surfaces of the upper sample 20 and the lower sample 10 are separated, start the horizontal vibration loader 21, set low-frequency vibration and check the operation data, reset if it runs normally, move the upper sample 20 downward again to overlap, and the clamping plate 3326 clamps the upper sample 20 with a certain pre-pressure; Step 4, test process: set the vibration loading parameters and loading sequence through the computer software terminal 7, start the test after the loader is connected to the network, first load with the vertical vibration loader 31, and carry out vertical pressure-holding loading or loading at a certain frequency, then set the vibration loading with the horizontal vibration loader 21, and the computer software terminal 7 displays the process curves and data related to force-displacement-time-frequency in real time; Step 5, reset and clean: reset after meeting the sample test curve, first stop the horizontal vibration loader 21, then stop the vertical vibration loader 31, save the data and turn off the oil source and controller 6, remove the auxiliary detection equipment, release the clamping plate 3326 and take out the upper sample 20, release the pressure plate 242 and remove the limit seat 241, take out the lower sample 10, and clean up the sample fragments.

[0040] The advantages of the present invention are: 1. The upper sample 20 is constrained in a limited direction, and a vertical vibration load can be applied to prevent the sample from tilting and deflecting. When the upper sample 20 is constrained in a limited direction, the horizontal force generated by the horizontal vibration of the upper sample 20 is obtained through the force sensor; 2. The support frame 3321 and the support connecting rod 323 are installed on the four-column 322 structural frame to form a U-shaped structure to strengthen the overall rigidity of the support frame 32, and at the same time, it is convenient to adjust the height of the clamping part 33 to meet the size of the sample. The support connecting rod 323 is convenient for installing sensors for measuring the mechanical parameters of the sample. At the same time, the front and back of the sample are open during the test process for easy observation; 3. A horizontal vibration mechanical structure is proposed to meet the requirements of large-stroke and high-frequency reciprocating vibration of the sample and ensure a short transmission path; 4. The position limit and directional movement limit can be adjusted adaptively for specimens of multiple sizes.

[0041] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0042] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0043] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A vibration-based rock mass structural surface friction characteristic size effect tester, characterized in that: It comprises a workbench (1), a horizontal vibration loading device (2), a vertical vibration loading device (3) and a control system; A mounting base (11) and a shock-absorbing pad (12) are provided on the top of the workbench (1); the shock-absorbing pad (12) is arranged between the workbench (1) and the mounting base (11); the mounting base (11) supports the horizontal vibration loading device (2); and the vertical vibration loading device (3) is installed on the workbench (1); The horizontal vibration loading device (2) comprises a horizontal vibration loader (21), a horizontal vibration table (22), a horizontal guide rail (23), a limiter (24), a horizontal force sensor (25) and a horizontal displacement sensor (26); the horizontal vibration table (22) is slidably arranged on the horizontal guide rail (23); the horizontal guide rail (23) is fixedly connected to the mounting base plate (11); the horizontal vibration loader (21) is mounted on the mounting base plate (11) and is used to drive the horizontal vibration table (22) to reciprocate horizontally on the horizontal guide rail (23); the horizontal force sensor (25) is arranged between the horizontal vibration loader (21) and the horizontal vibration table (22); the limiter (24) is mounted on the horizontal vibration table (22); the limiter (24) is used to fix the lower sample (10) on the table surface of the horizontal vibration table (22); the horizontal displacement sensor (26) is mounted on the mounting base plate (11) and is used to detect the horizontal displacement distance of the horizontal vibration table (22); The vertical vibration loading device (3) comprises a vertical vibration loader (31), a support frame (32), a clamping portion (33), a vertical guide portion (34) and a vertical force sensor (35), wherein the support frame (32) is fixed on the workbench (1), the clamping portion (33) is mounted on the support frame (32) and is used to clamp the upper sample (20) above the lower sample (10), the vertical guide portion (34) is mounted on the clamping portion (33) and is used to provide vertical guidance for the upper sample (20), the vertical vibration loader (31) is mounted on the support frame (32), the vertical vibration loader (31) is used to drive the upper sample (20) to squeeze and load the lower sample (10), and the vertical force sensor (35) is arranged on the vertical output end of the vertical vibration loader (31); The control system is used to control the operation of the horizontal vibration loading device (2) and the vertical vibration loading device (3) and output test data.

2. The vibration-based rock structure surface friction characteristic size effect tester according to claim 1 is characterized in that: The horizontal vibration loader (21) comprises a motor (211), a screw (212), a nut (213) and two support seats (214); the two support seats (214) are fixedly connected to the mounting base plate (11) and are arranged at intervals in the horizontal direction; the two ends of the screw (212) are rotatably arranged on the two support seats (214); the nut (213) is threadedly sleeved on the screw (212) and connected to the horizontal vibration table (22); the motor (211) is mounted on the mounting base plate (11); and the output shaft of the motor (211) is drivingly connected to the screw (212) via a coupling (215).

3. The vibration-based rock structure surface friction characteristic size effect tester according to claim 2 is characterized in that: The horizontal vibration table (22) comprises a loading plate (221), a movable support leg (222) and a traction plate (223); the movable support leg (222) has four and is fixedly connected to the bottom of the loading plate (221); the bottoms of the four movable support legs (222) are provided with horizontal movable sliders (224); the horizontal movable sliders (224) are slidably connected to the horizontal guide rail (23); the traction plate (223) is fixedly arranged on the loading plate (221); and the traction plate (223) is connected to the nut (213) via a horizontal force sensor (25).

4. The vibration-based rock mass structural surface friction characteristic size effect tester according to claim 3 is characterized in that: The limiting portion (24) comprises two limiting seats (241) arranged on the loading plate (221), the two limiting seats (241) are arranged at intervals, and the two limiting seats (241) are both provided with pressure plates (242) through screws, and the two pressure plates (242) are used to squeeze and limit the lower sample (10).

5. The vibration-based rock mass structural surface friction characteristic size effect tester according to claim 1, characterized in that: The support frame (32) comprises a top plate (321) and four columns (322) arranged at the bottom of the top plate (321); the four columns (322) are arranged at intervals around the circumference and fixedly connected to the workbench (1); and a supporting connecting rod (323) is provided between two adjacent columns (322).

6. The vibration-based rock mass structural surface friction characteristic size effect tester according to claim 5 is characterized in that: The clamping portion (33) comprises a left clamping assembly (331) and a right clamping assembly (332), wherein the left clamping assembly (331) is arranged on two upright posts (322), and the right clamping assembly (332) is arranged on the other two upright posts (322), wherein the left clamping assembly (331) and the right clamping assembly (332) are arranged opposite to each other for clamping the upper sample (20), wherein the right clamping assembly (332) comprises a support frame (3321), a guide rod (3322), a threaded rod (3323), a movable plate (3324), a support plate (3325) and a clamping plate (3326), wherein the support frame (3321) is connected to the two upright posts along a vertical sliding adjustment path. The threaded rod (3323) is screwed on the support frame (3321) for horizontal movement, the movable plate (3324) is connected to the inner end of the threaded rod (3323), the outer end of the threaded rod (3323) is provided with a hand wheel (3327), the guide rod (3322) is slidably arranged on the support frame (3321) in the horizontal direction and is fixedly connected to the movable plate (3324), the support plate (3325) is connected to the side of the movable plate (3324) away from the threaded rod (3323), and the clamping plate (3326) is connected to the side of the support plate (3325) away from the movable plate (3324).

7. The vibration-based rock structure surface friction characteristic size effect tester according to claim 6, characterized in that: The clamping portion (33) further includes a pressure sensor (333) for detecting the pressure of the clamping plate (3326), and the pressure sensor (333) is connected between the moving plate (3324) and the supporting plate (3325).

8. The vibration-based rock mass structural surface friction characteristic size effect tester according to claim 6 is characterized in that: The vertical guide portion (34) comprises a vertical guide rail (341) and a vertical movable slider (342), wherein the vertical guide rail (341) is fixedly connected to the support plate (3325), and the vertical movable slider (342) is slidably arranged on the vertical guide rail and fixedly connected to the clamping plate (3326).

9. The vibration-based rock mass structural surface friction characteristic size effect tester according to claim 5, characterized in that: The vertical vibration loader (31) comprises a vibration cylinder (311), a ball joint (312) and a vertical loading plate (313); the vibration cylinder (311) is fixedly mounted on a top plate (321); the ball joint (312) is connected to an output end of the vibration cylinder (311); the vertical loading plate (313) is connected to the ball joint (312); and the vertical force sensor (35) is provided between the ball joint (312) and the output end of the vibration cylinder (311).

10. The vibration-based rock mass structural surface friction characteristic size effect tester according to claim 1, characterized in that: The control system comprises a power oil source (4), an operating end (5), a controller (6) and a computer software end (7); the power oil source (4) provides output power for the horizontal vibration loader (21) and the vertical vibration loader (31); the operating end (5), the controller (6) and the computer software end (7) provide control and interface operations for the test.

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