A real-time monitoring device for rock damage based on electrochemical impedance eigenvalue

Abstract

The present invention discloses a real-time monitoring device for rock damage based on electrochemical impedance characteristic values, which belongs to the technical field of rock damage monitoring, and includes a workbench, on which a rotating table and a first execution unit for driving the rotating table to rotate are arranged, on which a fixed component capable of clamping and squeezing a rock test block and a three-point bending test device for detecting the bending performance of the rock test block are installed, the fixed component is electrically connected to an AC impedance spectrometer through a wire, a driving member for adjusting the position of a CCD camera is arranged on the workbench, an exciter is arranged inside the workbench, and the output end of the exciter is connected to the fixed component through a joint. By arranging the exciter, the three-point bending test device and the cylinder one, the rock test block can be damaged in different ways, and the AC impedance spectrometer, the magnetometer and the CCD camera are used for real-time monitoring, which can reveal the influence of different damages on the fracture performance of the sample.

Description

Technical Field

[0001] The invention relates to the technical field of rock damage monitoring, and in particular to a rock damage real-time monitoring device based on electrochemical impedance characteristic values. Background Art

[0002] Under long-term geological effects, discontinuities of different scales exist in the rock mass. During the excavation and advancement of rock mass engineering, the unloading of surrounding rock will lead to engineering problems such as hard rock rockburst and large deformation of soft rock. During the excavation and operation of rock mass engineering, the surrounding rock in a complex stress state will be subjected to various dynamic loads, including earthquakes, blasting, mechanical vibration, traffic loads, etc., resulting in the accumulation of damage to the surrounding rock and support, the degradation of physical and mechanical properties, and the impact on the stability of the rock mass engineering.

[0003] The surrounding rock in a complex stress state is subjected to various dynamic loads, including earthquakes, blasting, mechanical vibration, etc., which leads to the expansion and penetration of discontinuities inside the surrounding rock and supporting structures, the accumulation of damage, and the degradation of the physical and mechanical properties of the materials. For the surrounding rock system in a critical state, even a small disturbance may cause the surrounding rock to become unstable and damaged, so it is very necessary to study this type of "small disturbance". Summary of the invention

[0004] The purpose of the present invention is to provide a real-time monitoring device for rock damage based on electrochemical impedance eigenvalues ​​to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a real-time monitoring device for rock damage based on electrochemical impedance characteristic values, comprising a workbench, an AC impedance spectrometer for monitoring the electrochemical impedance characteristic values ​​of a rock test block, a magnetometer for detecting the rock magnetic field and a CCD camera for scanning the surface of the rock test block, a rotating table and a first execution unit for driving the rotating table to rotate are arranged on the workbench, a fixing component for clamping and squeezing the rock test block and a three-point bending test device for detecting the bending performance of the rock test block are installed on the rotating table, the fixing component is electrically connected to the AC impedance spectrometer through a wire, a driving component for adjusting the position of the CCD camera is arranged on the workbench, an exciter is arranged inside the workbench, and the output end of the exciter is connected to the fixing component through a connector.

[0006] Preferably, the fixing assembly includes a clamping seat, the bottom of the inner wall of the clamping seat is rotatably connected to a traction disk, the bottom of the traction disk is plugged with an elastic telescopic column connected to a rotating table, the side wall of the clamping seat is plugged with a plurality of connecting arms, the upper surface of the traction disk is provided with a traction bar, a notch corresponding to the traction bar is formed at the bottom of one end of the connecting arm, a clamping arm is installed at the other end of the connecting arm, and a clamping seat is provided at the end of the clamping arm.

[0007] Preferably, one end of the clamping arm is sleeved with two connecting columns, a spring is sleeved on the connecting column, one end of the two connecting columns is connected to the connecting arm, a push plate is provided on the upper surface of the clamping arm, and a cylinder is installed on the upper surface of the workbench through a supporting frame, and the cylinder is used to drive the push plate to move.

[0008] Preferably, an electrode sheet is provided on the abutting side of the clamp and the rock test block, a magnetic induction element is provided in the clamp, the electrode sheet is connected to the AC impedance spectrometer through a wire, and the magnetic induction element is connected to the magnetometer through a wire.

[0009] Preferably, the three-point bending test device includes a loading head, a mounting disk, and a second execution unit that drives the mounting disk to rotate, the loading head is located on the driving member, a plurality of supports are arranged above the mounting disk, the supports are electrically connected to the AC impedance spectrometer through wires, the bottom ends of the supports are connected to bottom blocks, a lifting block is arranged on the upper surface of the mounting disk, the bottom block and the lifting block correspond one to one, and a second spring is arranged between the bottom of the support and the top of the inner wall of the rotating table.

[0010] Preferably, the driving member includes an adjusting member and a scanning mounting member, and the adjusting member is used to adjust the position of the scanning mounting member.

[0011] Preferably, the adjusting member includes two brackets, which are rotatably connected to an arc arm via a driving shaft, wherein a third actuator unit for driving the arc arm to rotate is installed on one of the brackets, and the arc arm is slidably connected to a movable seat via an arc groove, and a fourth actuator unit for driving the movable seat to move along the arc arm is installed on the movable seat.

[0012] Preferably, the scanning mounting component includes two cylinders 2 connected to the moving seat, and the output ends of the cylinders 2 are each provided with a mounting seat, one of the mounting seats is connected to the loading head, and the other mounting seat is connected to the CCD camera.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] By setting up a vibrator, a three-point bending test device and a cylinder, the rock specimen can be damaged in different ways, and real-time monitoring can be performed using an AC impedance spectrometer, a magnetometer and a CCD camera to reveal the effects of different damages on the fracture properties of the specimen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0016] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0017] Figure 3 It is a structural stereogram of the driving member of the present invention;

[0018] Figure 4 It is a partial structural exploded view of the driving member of the present invention;

[0019] Figure 5 It is a structural disassembly diagram of the fixing assembly of the present invention;

[0020] Figure 6 A three-dimensional diagram of the internal structure of the rotating platform of the present invention;

[0021] Figure 7 It is a structural stereogram of the monitoring component of the present invention.

[0022] In the figure:

[0023] 1. Workbench; 2. Rotating table; 3. Motor 1; 4. Gear 1; 5. Rack; 6. Vibrator; 7. Joint; 8. Clamping seat; 9. Traction plate; 10. Elastic telescopic column; 11. Connecting arm; 12. Traction bar; 13. Connecting column; 14. Clamping arm; 15. Clamping seat; 16. Spring 1; 17. Push plate; 18. Carrying frame; 19. Cylinder 1; 20. Mounting plate; 21. Motor 2; 22. Gear 2; 23. Lifting block ; 24. Support; 25. Bottom block; 26. Spring 2; 27. Bracket; 28. Drive shaft; 29. ​​Arc arm; 30. Motor 3; 31. Worm 1; 32. Worm wheel; 33. Arc groove; 34. Moving seat; 35. Motor group; 36. Worm 2; 37. Arc rack; 38. Cylinder 2; 39. Mounting seat; 40. Loading head; 41. CCD camera; 42. Controller; 43. Electrode sheet; 44. Magnetic induction element. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-7 , the present invention provides a technical solution:

[0026] A real-time monitoring device for rock destruction based on electrochemical impedance characteristic values ​​comprises a workbench 1, an AC impedance spectrometer and a magnetometer. A controller 42 on the workbench 1 is electrically connected to a control panel via a wire, and the controller 42 is used to operate when a destruction experiment is performed on a rock test block. A rotating table 2 is provided on the workbench 1, and the rotating table 2 is rotated by a first execution unit installed in the cavity of the workbench 1. A fixing component and a three-point bending test device are installed on the rotating table 2. The fixing component is used to clamp and squeeze the rock test block, and the three-point bending test device is used to perform a three-point bending test on the rock test block. A driving component for adjusting the position of a CCD camera 41 is installed on the upper surface of the workbench 1.

[0027] It should be noted that, in this embodiment, the controller 42 is a Delta Programmable Logic Controller of model DVP32EH00R3-L, and the fixed component is connected to the AC impedance spectrometer through a wire, wherein the AC impedance spectrometer is a Solartron1260 precision impedance analyzer, and the magnetometer is a Lakeshore 475.

[0028] like Figure 1-2 As shown, a vibrator 6 is installed in the cavity of the workbench 1, and the output end of the vibrator 6 passes through the workbench 1 and the rotating table 2 and is installed with a joint 7, which is threadedly connected to the fixed component, wherein the output shaft of the vibrator 6 is socketed with the rotating table 2. When the vibrator 6 is working, it performs up and down simple harmonic vibration on the rock test block on the fixed component. The model of the vibrator 6 is VM455-JZK-10.

[0029] like Figure 5 As shown, the fixing assembly includes a clamping seat 8, a traction plate 9 is rotatably connected in the clamping seat 8, an elastic telescopic column 10 is inserted between the traction plate 9 and the rotating table 2, two connecting arms 11 are inserted on the side wall of the clamping seat 8, one end of the connecting arm 11 extends to the inside of the clamping seat 8, and a clamping arm 14 is installed on the other end of the connecting arm 11. By rotating the clamping seat 8, the traction plate 9 is kept fixed in the restrictive state of the elastic telescopic column 10, and the connecting arm 11 rotates, and the guide of the spiral traction strip 12 on the traction plate 9 is Under the action of the clamping seat 8, a plurality of connecting arms 11 move toward the center of the clamping seat 8 until the clamping seat 15 on the clamping arm 14 fits tightly with the rock test block. A notch corresponding to the traction bar 12 is provided at the bottom of one end of the connecting arm 11, so that when the connecting arm 11 rotates, it can move toward the center of the clamping seat 8. In this embodiment, a clamping seat 15 for clamping the rock test block is installed at the end of the clamping arm 14, wherein the elastic telescopic column 10 includes a telescopic rod and a spring, the cross-section of the telescopic rod is I-shaped, and the telescopic rod and the spring are socketed.

[0030] Furthermore, two connecting columns 13 are installed at the other end of the connecting arm 11, and the connecting columns 13 are sleeved with the clamping arm 14. A spring 16 is sleeved on the connecting column 13, and a cylinder 19 installed on the workbench 1 is controlled to work. The cylinder 19 is connected to the workbench 1 through the supporting frame 18, so that the cylinder 19 pushes the push plate 17 located on the upper surface of the clamping arm 14 to start moving, so that the multiple clamping seats 15 are squeezed to realize the extrusion destruction experiment of the rock test block.

[0031] Furthermore, an electrode sheet 43 is provided on the abutting side of the clamp 15 and the rock test block. The electrode sheet 43 is connected to an AC impedance spectrometer through a wire and is used to detect the electrochemical impedance characteristic value of the rock test block. A magnetic induction element 44 is provided on one side of the clamp 15 close to the electrode sheet 43. The magnetic induction element 44 is connected to a magnetometer through a wire and is used to detect the magnetic field characteristics of the rock test block during the destruction process.

[0032] like Figure 7 As shown, the three-point bending test device includes a mounting disk 20 and a second execution unit for driving the mounting disk 20 to rotate. Two supports 24 are arranged above the mounting disk 20. Through holes corresponding to the supports 24 are opened on the rotating table 2 and the clamping seat 8. The bottom end of the support 24 is connected to a bottom block 25. A lifting block 23 is arranged on the upper surface of the mounting disk 20. The lifting block 23 and the bottom block 25 are in a right-angle trapezoidal shape in vertical projection, and the inclined surfaces of the lifting block 23 and the bottom block 25 are against each other. By controlling the operation of the second execution unit, the mounting disk 20 drives the lifting block 23 to start rotating, and the support 24 is moved up under the guidance of the inclined surface until the support 24 contacts the rock test block, lifts the rock test block, and squeezes the rock test block through the loading head 40 to monitor the bending performance of the rock test block. A spring 26 is arranged between the bottom of the support 24 and the top of the inner wall of the rotating table 2.

[0033] like Figure 6 and Figure 7 As shown, the first execution unit includes a motor 3, which is installed in a cavity in the workbench 1. The output shaft of the motor 3 extends to the interior of the rotating table 2 and is installed with a gear 4. The inner circumference of the rotating table 2 is provided with a plurality of racks 5 corresponding to the gears 4. The motor 3 is controlled to work so that the gears 4 start to rotate, and the fixed component is rotated with the cooperation of the racks 5, so that the rock test block placed on the fixed component rotates.

[0034] The second execution unit includes a second motor 21, which is installed in a cavity in the workbench 1. The output shaft of the second motor 21 extends to the inside of the rotating table 2 and is installed with a second gear 22. The outer peripheral surface of the mounting plate 20 is provided with a plurality of tooth grooves corresponding to the second gear 22.

[0035] like Figure 3 and 4As shown, the driving member includes an adjusting member and a scanning mounting member. The adjusting member is used to adjust the position of the scanning mounting member and cooperates with the first execution unit to achieve all-round scanning or local targeted scanning of the rock test block.

[0036] Furthermore, the adjusting member includes two brackets 27, which are rotatably connected to the arc-shaped arm 29 through the driving shaft 28 on the bracket 27, and the third actuator on one of the brackets 27 is used to adjust the inclination angle of the arc-shaped arm 29. The arc-shaped arm 29 is slidably connected to the moving seat 34 through the arc-shaped groove 33, and the moving seat 34 is provided with a fourth actuator for driving the moving seat 34 to move along the guide of the arc-shaped groove 33. The scanning mounting member includes two cylinders 38 connected to the moving seat 34, and the cylinders 38 are used to drive the mounting seat 39 to move toward the fixed assembly respectively. The loading head 40 for loading the surface of the rock test block is installed on one of the mounting seats 39, and the other mounting seat 39 is installed with a CCD camera 41 for photographing and transmitting the damage condition of the surface of the rock test block. The model of the CCD camera 41 is Hamamatsu Orca.

[0037] Further, the third execution unit includes a motor 30, a worm 1 31 and a worm wheel 32, wherein the worm 1 31 is connected to the output end of the motor 30, and the worm 1 31 is meshed with the worm wheel 32. The fourth execution unit includes a motor group 35, wherein the output shaft of the motor group 35 extends to the inside of the moving seat 34 and is provided with a worm 2 36, wherein the bottom of the worm 2 36 is meshed with an arc-shaped rack 37, and the arc-shaped rack 37 is connected to the arc-shaped arm 29.

[0038] The working process of this embodiment is as follows: before real-time monitoring of the rock test block, the rock test block is prepared first. The test block has a rectangular structure with basic dimensions of 50 mm in length, 30 mm in width and 25 mm in height, and is prepared using shale, limestone and rock-like materials, respectively. The test blocks are divided into an initial group, an unloading damage group and a vibration damage group. The rock test blocks are then placed on the fixing assembly in turn and clamped.

[0039] For the initial group, under the action of the driving part, a 1.8mm thick grinding wheel on a cutting machine is used to cut cracks, and the length of the cracks is 18mm;

[0040] For the unloading damage group, after cutting with a cutting machine, the rock test block is squeezed with a three-point bending test machine to detect the bending performance of the rock test block. The rock test block can also be squeezed by controlling the cylinder 19 to test the anti-extrusion performance of the rock test block.

[0041] For the vibration damage group, after cutting with a cutting machine, the rock specimens were subjected to vibration loads using an exciter 6 for a duration of 10 to 60 minutes;

[0042] In the above process, the electrochemical characteristic values ​​of the rock test blocks are monitored in real time by means of the monitoring components, and the magnetic field characteristics of the rock test blocks are detected by means of a magnetometer, so as to study the cumulative damage effect of mechanical vibration on rocks and rock-like materials, and to photograph the surfaces of different rock test blocks by means of a CCD camera 41, so as to analyze the mineral particles and fracture microscopic morphology of the rock test blocks in the images.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A real-time monitoring device for rock damage based on electrochemical impedance characteristic values, comprising a workbench, an AC impedance spectrometer for monitoring the electrochemical impedance characteristic values ​​of a rock test block, a magnetometer for detecting the magnetic field of the rock test block, and a CCD camera for scanning the surface of the rock test block, characterized in that: The workbench is provided with a rotating table and a first execution unit for driving the rotating table to rotate, the rotating table is provided with a fixing component for clamping and squeezing rocks and a three-point bending test device for detecting the bending performance of rock test blocks, the fixing component is electrically connected to an AC impedance spectrometer through a wire, the workbench is provided with a driving member for adjusting the position of a CCD camera, an exciter is provided inside the workbench, and the output end of the exciter is connected to the fixing component through a connector; The fixing assembly comprises a clamping seat, the bottom of the inner wall of the clamping seat is rotatably connected with a traction disc, the bottom of the traction disc is plugged with an elastic telescopic column connected with the rotating table, the side wall of the clamping seat is plugged with a plurality of connecting arms, the upper surface of the traction disc is provided with a spiral traction bar, one end of the connecting arm extends to the inside of the clamping seat and is provided with a notch corresponding to the traction bar, the other end of the connecting arm is installed with a clamping arm, and the end of the clamping arm is provided with a clamping seat; The three-point bending test device comprises a loading head, a mounting disk and a second execution unit for driving the mounting disk to rotate, the loading head is located on the driving member, a plurality of supports are arranged above the mounting disk, through holes corresponding to the supports are provided on the rotating table and the clamping seat, the supports are electrically connected to the AC impedance spectrometer through a wire, a bottom block is connected to the bottom end of the support, a lifting block is arranged on the upper surface of the mounting disk, the bottom block and the lifting block correspond to each other one by one, the lifting block and the bottom block are in a right-angle trapezoid in vertical projection, and the inclined surfaces of the lifting block and the bottom block are against each other, the second execution unit is controlled to work so that the mounting disk drives the lifting block to start rotating, and the support is moved up under the guidance of the inclined surface until the support contacts the rock test block, and the rock test block is lifted up, and a second spring is arranged between the bottom of the support and the top of the inner wall of the rotating table; The driving member includes an adjusting member and a scanning mounting member, and the adjusting member is used to adjust the position of the scanning mounting member; The adjusting member comprises two brackets, the brackets are rotatably connected to arc-shaped arms through a driving shaft, a third execution unit for driving the arc-shaped arm to rotate is installed on one of the brackets, the arc-shaped arm is slidably connected to a moving seat through an arc-shaped groove, and a fourth execution unit for driving the moving seat to move along the arc-shaped arm is installed on the moving seat; The scanning mounting part comprises two cylinders 2 connected to the moving seat, and the output ends of the cylinders 2 are each provided with a mounting seat, one of the mounting seats is connected to the loading head, and the other mounting seat is connected to the CCD camera.

2. The real-time monitoring device for rock damage based on electrochemical impedance eigenvalue according to claim 1 is characterized in that: One end of the clamping arm is sleeved with two connecting columns, and a spring is sleeved on the connecting column. One end of the two connecting columns is connected to the connecting arm. A push plate is provided on the upper surface of the clamping arm. A cylinder is installed on the upper surface of the workbench through a supporting frame, and the cylinder is used to drive the push plate to move.

3. The real-time monitoring device for rock damage based on electrochemical impedance eigenvalue according to claim 1 is characterized in that: An electrode sheet is arranged on the abutting side of the clamping seat and the rock test block, a magnetic induction element is arranged in the clamping seat, the electrode sheet is connected to the AC impedance spectrometer through a wire, and the magnetic induction element is connected to the magnetometer through a wire.

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