Similar simulation device and experimental method for stability of coal pillar of mine underground reservoir

Abstract

The invention relates to the technical field of coal pillar stability tests, and discloses a similar simulation device and an experimental method.The similar simulation device comprises a loading assembly, the outer side of the loading assembly is connected with a lifting mechanism, and the lifting mechanism is connected with a pressurizing assembly connected with the loading assembly; the pressurizing assembly is connected with a plugging mechanism connected with a lifting mechanism, and the lifting mechanism is connected with a measuring mechanism. The device is convenient for sampling and analyzing the properties of the coal pillar, changes the situation that the test is inaccurate when the output end singly detects the seepage erosion state in the traditional pressurization process, simulates the pressure test seepage and fracture development states of the coal pillar under different conditions, is convenient for experimenters to carry out experimental detection on the coal pillar, and improves the test efficiency. And data support is provided for construction and long-term safe operation of a coal mine underground reservoir system.

Description

Technical Field

[0001] The invention relates to the technical field of coal pillar stability test, in particular to a similar simulation device and an experimental method for the stability of coal pillars in underground reservoirs of mines. Background Art

[0002] The water conservation mining concept of building underground reservoirs in coal mine goafs can not only realize the storage and call of mine water, but also use the gangue falling from the goafs to filter, precipitate, adsorb, ion exchange and other self-purification treatments on mine water, solving the problems of low efficiency, poor benefits and low resource recovery rate existing in traditional water conservation mining technologies (filling mining, strip mining, height-limited mining, etc.). However, during the construction of underground water reservoirs in mines, the residual coal pillars on the working face are affected by multiple mining stresses. The residual coal pillars are in a complex stress environment with superposition of dynamic and static loads such as lateral support pressure of broken roof, pressure of overburden strata and mine shock (caused by large-scale collapse of surrounding room-type goafs or large-scale collapse of thick and hard roofs in the mine due to mining, etc.); in addition, water intrusion will also have a strong weakening effect on the residual coal pillars. Water-rock interaction has always been the focus of rock mechanics research. Water intrusion will reduce the mechanical properties of coal and rock and change the morphology of crack propagation;

[0003] In the process of conducting similar simulation tests on coal pillars, it is necessary to simulate the effects of water and stress on the coal pillars in the natural environment. The existing test devices use forward pressure tests and collect seepage water on the sides of the coal pillars to conduct coal pillar simulation tests during the experiments. Since the stress direction and magnitude of the coal pillars are inconsistent under natural conditions, it is impossible to effectively simulate the experimental requirements of coal pillars under stress loading in different directions, and it is also impossible to accurately collect the permeability state of the coal pillars. Therefore, a similar simulation device and experimental method for the stability of coal pillars in underground reservoirs in mines are proposed. Summary of the invention

[0004] In order to solve the technical problem that the coal pillar experiment demand under stress loading in different directions cannot be effectively simulated and the permeability state of the coal pillar cannot be accurately collected, the present invention provides a similar simulation device and experimental method for the stability of the coal pillar of the underground reservoir in a mine.

[0005] The present invention is implemented by the following technical scheme: a similar simulation device for the stability of coal pillars in underground water reservoirs in mines, comprising a loading component, a lifting mechanism is connected to the outside of the loading component, the lifting mechanism is connected to a pressurizing component connected to the loading component, the pressurizing component is connected to a blocking mechanism connected to the lifting mechanism, and the lifting mechanism is connected to a measuring mechanism;

[0006] The pressurizing assembly includes a movable plate connected to the output end of the lifting mechanism, a guide plate with an arc-shaped structure is fixedly connected to the bottom of the movable plate, an inwardly recessed groove is provided on the inner concave surface of the bottom of the guide plate, a rack with an arc-shaped structure is fixedly connected to the inner side wall of the top of the groove, sliding seats with U-shaped structure are slidably connected on both sides of the guide plate, an H-shaped stabilizing frame is fixedly connected between the bottoms of the two groups of sliding seats, an extension plate with a T-shaped structure is slidably connected to the inner side wall of the bottom opening of the stabilizing frame, pressurizing units fixed to the stabilizing frame are installed on both sides of the extension plate, the stabilizing frame is connected to a driving unit meshing with the rack, and a deflection shaft slidably connected to the loading assembly is fixedly connected to the bottom of the extension plate.

[0007] Through the above technical scheme, the strain gauge is installed on the coal pillar, and the acoustic emission probe is arranged. The coal pillar is placed on the loading assembly, and the state of the measuring mechanism is adjusted according to the experimental needs. Thereafter, the installed coal pillar is transported to the inside of the loading assembly by the lifting mechanism, and the coal pillar is pressurized by the pressurizing assembly.

[0008] As a further improvement of the above scheme, the loading assembly includes a box body with an opening on the top, and vertical plates are fixedly connected to the inner walls on both sides of the adjacent boxes, a pad is arranged between the two groups of vertical plates, a connecting plate connected to the lifting mechanism is fixedly connected to one side of the pad, a pressure plate for pressurizing the coal pillar is arranged on the top of the pad, a slide groove 1 which is slidably connected to the pressurizing assembly is arranged on the top of the pressure plate, a water pipe 1 is fixedly connected to one side of the bottom of the box body, and water pipes 2 which are sequentially distributed along the length direction of the bottom plate are fixedly connected to the other side of the bottom of the box body.

[0009] Through the above technical solution, the loading and placement of the coal pillar is realized, and at the same time the two sides of the coal pillar are separated to prevent the experimental permeate from overflowing from positions outside the coal pillar, thereby improving the progress and effect of the test.

[0010] As a further improvement of the above scheme, the lifting mechanism includes a support frame fixedly connected to the loading assembly, a pushing unit 1 is fixedly connected to the top of the support frame, a base plate is fixedly connected to the bottom output end of the pushing unit 1, a pushing unit 2 fixed to the top of the movable plate is fixedly connected to the bottom of the base plate, a pull rod 1 fixed to the bottom of the base plate is installed on both sides of the pushing unit 2, a cover plate is fixedly connected to the bottom of the pull rod 1, and the cover plate is slidably connected to the blocking mechanism, a pull rod 2 fixed to the loading assembly is fixedly connected to the bottom of the cover plate, and the cover plate is fixedly connected to the top of the measuring mechanism.

[0011] Through the above technical solution, the lifting and lowering operations of the loading assembly and other components are realized. After being assembled and installed outside the box of the loading assembly, it is transported to the inside of the box for testing, which is convenient for the test personnel to perform installation and debugging operations.

[0012] As a further improvement of the above solution, an extension channel for extending the measuring component is passed through the top of the cover plate, and a blocking mechanism is arranged on one side of the opening of the extension channel, and the cover plate is fixedly connected to a water pipe three.

[0013] As a further improvement of the above scheme, the sealing mechanism includes a support plate, which has a cylindrical storage groove passing through it, the storage groove is slidably connected to a docking rod with a cylindrical structure, the docking rod passes through a sliding channel that is slidably connected to the extension plate, and the top and bottom of the support plate away from the measuring mechanism are fixed with sealing plates.

[0014] Through the above technical solution, when adjusting the inclination angle of the extension plate, the extension plate drives the docking rod to move, and then the docking rod deflects in the storage groove of the support plate, while pushing the support plate to slide along the length direction of the cover plate, and the sealing plates arranged at the bottom and top of the cover plate seal the sliding channel on the cover plate.

[0015] As a further improvement of the above scheme, the measuring mechanism includes a carrying plate fixed to the lifting mechanism, an upper sealing plate fixed to one side of the carrying plate, the upper sealing plate fixed to clamping units distributed in sequence along its length direction, a detection connection unit fixed to the upper sealing plate is installed on one side of the clamping unit, a bottom sealing plate fixed to the carrying plate is arranged at the bottom of the upper sealing plate, a transition groove distributed along its length direction is opened at the bottom of the bottom sealing plate, a docking tube arranged in sequence along the length direction of the bottom sealing plate is fixed to the inner side wall at the top of the transition groove, and a partition plate distributed along the length direction of the bottom sealing plate is arranged between the bottom sealing plate and the upper sealing plate.

[0016] Through the above technical scheme, the partition plate is inserted into the preset position between the upper sealing plate and the bottom sealing plate, and then the sleeve rod is rotated to make the clamping plate move downward to clamp the partition plate. At this time, the upper sealing plate is in contact with the side of the pressure plate, and the bottom sealing plate is in contact with the side of the pad. The partition plates are distributed in sequence along the length direction of the coal pillar, so that the installed partition plate separates the upper sealing plate and the bottom sealing plate to form a plurality of detection cavities distributed in sequence, thereby detecting the seepage erosion state at different positions of the detection end of the coal pillar.

[0017] As a further improvement of the above scheme, the detection connection unit includes a water pipe four fixedly connected to the upper sealing plate, an acoustic emission interface and a strain acquisition interface, and sealing strips are installed on the side of the upper sealing plate, the bottom sealing plate and the partition plate away from the supporting plate.

[0018] The above technical solution facilitates the connection between the strain gauge used in the test and the strain collector, and the connection between the acoustic emission probe and the acoustic emission collector.

[0019] As a further improvement of the above scheme, the clamping unit includes a long strip-shaped accommodating groove opened at the bottom of the upper sealing plate, the accommodating groove is slidably connected to a U-shaped structure clamping plate with a bottom opening, and the top of the clamping plate is rotatably connected to an adjusting rod threadedly sleeved with the upper sealing plate.

[0020] As a further improvement of the above solution, the drive unit includes a motor fixedly connected to the top of the stabilizing frame, the output end of the motor is connected to a driving shaft, the driving shaft is connected to the top of the stabilizing frame through a bearing seat, and the outer ring of the driving shaft is fixedly sleeved with a gear meshing with the rack.

[0021] An experimental method for a similar simulation device for the stability of coal pillars in underground reservoirs of a mine comprises the following steps:

[0022] S1. Simulation device, coal pillar for testing, acoustic wave testing system and strain testing system to be prepared for testing;

[0023] S2. Determine the simulation device to carry out the experimental simulation plan according to the experimental needs, and complete the assembly operations of the coal pillar, simulation device, acoustic wave detection system and strain test system;

[0024] S3. According to the simulation scheme of the simulation device, the pressure size and direction of the coal pillar experiment are adjusted by using the simulation device, and the coal pillar experiment data are accurately tested in sections by using the measuring mechanism.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention adopts a separated detection method at the end of the coal pillar test, which can detect the seepage erosion state of different intervals of the coal pillar under pressurization, facilitate sampling and analysis of the properties of the coal pillar, and change the situation of inaccurate single detection of seepage erosion state test at the output end of the traditional pressurization process.

[0027] 2. During the pressure test, the present invention can simulate load conditions of different directions and sizes under natural conditions, especially simulate lateral pressure test conditions, simulate the pressure test permeability and crack development state of the coal pillar under different conditions, so as to facilitate the experimenters to conduct experimental detection on the coal pillar and provide data support for the construction and long-term safe operation of the coal mine underground water reservoir system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a similar simulation device for the stability of coal pillars in underground reservoirs in a mine provided by the present invention;

[0029] Figure 2 A schematic diagram of the structure of the pressurizing assembly provided by the present invention;

[0030] Figure 3 A schematic diagram of the structure of the guide plate provided by the present invention;

[0031] Figure 4 A schematic diagram of the structure of the loading assembly provided by the present invention;

[0032] Figure 5 A schematic diagram of the structure of the measuring mechanism provided by the present invention;

[0033] Figure 6 A side view of the measuring mechanism provided by the present invention;

[0034] Figure 7 A schematic diagram of the structure of the cover plate provided by the present invention;

[0035] Figure 8 This is a schematic structural diagram of the blocking mechanism provided by the present invention.

[0036] Description of main symbols:

[0037] 1. Loading assembly; 2. Lifting mechanism; 3. Pressurizing assembly; 4. Sealing mechanism; 5. Measuring mechanism; 11. Box; 12. Water pipe 1; 13. Water pipe 2; 14. Vertical plate; 15. Pad; 16. Connecting plate; 17. Pressing plate; 18. Slide 1; 21. Support frame; 22. Pushing unit 1; 23. Base plate; 24. Pushing unit 2; 25. Pull rod 1; 26. Cover plate; 27. Pull rod 2; 28. Extending channel; 31. Guide plate; 32. Groove; 33. Rack; 34. Movable plate; 35. Slide seat ; 36. Stabilizing frame; 37. Driving unit; 39. Extension plate; 310. Pressurizing unit; 311. Deflection axis; 41. Support plate; 42. Storage groove; 43. Docking rod; 44. Sliding channel; 45. Sealing plate; 51. Load-bearing plate; 52. Upper end blocking plate; 53. Clamping unit; 54. Water pipe four; 55. Acoustic emission interface; 56. Strain acquisition interface; 57. Bottom blocking plate; 58. Transition groove; 59. Docking tube; 510 partition plate; 531. Accommodating groove; 532. Clamping plate; 533. Adjusting rod. DETAILED DESCRIPTION

[0038] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0039] Embodiment 1:

[0040] Please combine Figure 1-Figure 8 The similar simulation device for the stability of coal pillars in underground water reservoirs of a mine of this embodiment comprises a loading component 1, a lifting mechanism 2 is connected to the outside of the loading component 1, the lifting mechanism 2 is connected to a pressurizing component 3 connected to the loading component 1, the pressurizing component 3 is connected to a blocking mechanism 4 connected to the lifting mechanism 2, and the lifting mechanism 2 is connected to a measuring mechanism 5;

[0041] The pressurizing assembly 3 includes a movable plate 34 connected to the output end of the lifting mechanism 2, a guide plate 31 with an arc-shaped structure is fixedly connected to the bottom of the movable plate 34, an inwardly recessed groove 32 is provided on the inner concave surface of the bottom of the guide plate 31, a rack 33 with an arc-shaped structure is fixedly connected to the inner side wall at the top of the groove 32, U-shaped slide seats 35 are slidably connected to both sides of the guide plate 31, an H-shaped stabilizing frame 36 is fixedly connected between the bottoms of the two groups of slide seats 35, an extension plate 39 with a T-shaped structure is slidably connected to the inner side wall of the bottom opening of the stabilizing frame 36, pressurizing units 310 fixed to the stabilizing frame 36 are installed on both sides of the extension plate 39, the stabilizing frame 36 is connected to a driving unit 37 meshing with the rack 33, and a deflection shaft 311 slidably connected to the loading assembly 1 is fixedly connected to the bottom of the extension plate 39.

[0042] The implementation principle of the similar simulation device and experimental method for the stability of the coal pillar in the underground water reservoir of the mine in the embodiment of the present application is as follows: a strain gauge is installed on the coal pillar, and an acoustic emission probe is arranged, the coal pillar is placed on the loading assembly 1, and the state of the measuring mechanism 5 is adjusted according to the experimental needs. Thereafter, the installed coal pillar is transported to the inside of the loading assembly 1 by the lifting mechanism 2, and the coal pillar is subjected to a pressurization test by the pressurizing assembly 2.

[0043] Embodiment 2:

[0044] The present embodiment is further improved on the basis of the embodiment 1 in that: the loading assembly 1 comprises a box body 11 with an opening on the top, vertical plates 14 are fixedly connected to the inner side walls on both sides of the adjacent boxes 11, a pad 15 is arranged between the two groups of vertical plates 14, a connecting plate 16 connected to the lifting mechanism 2 is fixedly connected to one side of the pad 15, a pressing plate 17 for pressurizing the coal pillar is arranged on the top of the pad 15, a slide groove 18 slidably connected to the pressurizing assembly 3 is arranged on the top of the pressing plate 17, a water pipe 12 is fixedly connected to one side of the bottom of the box body 11, and water pipes 13 13 distributed in sequence along the length direction of the bottom plate 15 are fixedly connected to the other side of the bottom of the box body 11.

[0045] The lifting mechanism 2 includes a support frame 21 fixedly connected to the loading assembly 1, a pushing unit 22 is fixedly connected to the top of the support frame 21, a base plate 23 is fixedly connected to the bottom output end of the pushing unit 22, a pushing unit 24 fixedly connected to the top of the movable plate 34 is fixedly connected to the bottom of the base plate 23, a pull rod 25 fixed to the bottom of the base plate 23 is installed on both sides of the pushing unit 24, a cover plate 26 is fixedly connected to the bottom of the pull rod 25, and the cover plate 26 is slidably connected to the blocking mechanism 4, a pull rod 27 fixedly connected to the connecting plate 16 of the loading assembly 1 is fixedly connected to the bottom of the cover plate 26, and the cover plate 26 is fixedly connected to the top of the measuring mechanism 5.

[0046] An extension channel 28 for extending the measuring component 5 is passed through the top of the cover plate 26, and the blocking mechanism 4 is arranged on one side of the opening of the extension channel 28. The cover plate 26 is fixedly connected to a water pipe 3.

[0047] Embodiment 3:

[0048] Based on Example 1, the present embodiment is further improved in that: the blocking mechanism 4 includes a support plate 41, the support plate 41 penetrates a receiving groove 42 of a cylindrical structure, the receiving groove 42 is slidably connected to a docking rod 43 of a cylindrical structure, the docking rod 43 penetrates a sliding channel 44 slidably connected to the extension plate 39, the top and bottom of the support plate 41 away from the measuring mechanism 5 are fixedly connected with sealing plates 45, the cover plate 26 is distributed between the two groups of sealing plates 45, and the cover plate 26 is slidably connected to the two groups of sealing plates 45.

[0049] Embodiment 4:

[0050] The measuring mechanism 5 includes a supporting plate 51 fixed to the cover plate 26 of the lifting mechanism 2, an upper end sealing plate 52 fixed to one side of the supporting plate 51, the upper end sealing plate 52 fixed to clamping units 53 distributed in sequence along its length direction, a detection connection unit fixed to the upper end sealing plate 52 is installed on one side of the clamping unit 53, a bottom of the upper end sealing plate 52 is provided with a bottom sealing plate 57 fixed to the supporting plate 51, a transition groove 58 distributed along its length direction is opened at the bottom of the bottom sealing plate 57, a docking tube 59 arranged in sequence along the length direction of the bottom sealing plate 57 is fixed to the inner side wall at the top of the transition groove 58, and a partition plate 510 distributed along the length direction of the bottom sealing plate 57 is provided between the bottom sealing plate 57 and the upper end sealing plate 52.

[0051] The detection connection unit includes a water pipe 54 fixedly connected to the upper sealing plate 52, an acoustic emission interface 55 and a strain acquisition interface 56. The upper sealing plate 52, the bottom sealing plate 57 and the partition plate 510 are all installed with sealing strips on the side away from the supporting plate 51.

[0052] The clamping unit 53 includes a long strip-shaped receiving groove 531 opened at the bottom of the upper end sealing plate 52, and the receiving groove 531 is slidably connected to a U-shaped clamping plate 532 with a bottom opening. The top of the clamping plate 532 is rotatably connected to an adjusting rod 533 threadedly sleeved with the upper end sealing plate 52.

[0053] Embodiment 5:

[0054] The driving unit 37 includes a motor fixedly connected to the top of the stabilizing frame 36, the output end of the motor is connected to a driving shaft, the driving shaft is connected to the top of the stabilizing frame 36 through a bearing seat, the outer ring of the driving shaft is fixedly sleeved with a gear meshing with the rack 33, the pushing unit 1 22 and the pushing unit 2 24 use push rod motors, and the pressurizing unit 310 uses a hydraulic cylinder.

[0055] Embodiment 6:

[0056] A control box and a hydraulic pump are installed on one side of the box body 11, a controller is installed inside the control box, a data interface, a power interface, a display and a switch are installed on the control box, water pipe 1 12, water pipe 2 13, water pipe 3 and water pipe 4 54 are all installed with solenoid valves and flow meters, the hydraulic pump is connected to the hydraulic cylinder through an oil pipe, a pressure sensor is installed on the oil pipe, and the controller is connected to the motor, push rod motor, hydraulic pump, pressure sensor, solenoid valve, flow meter, data interface, power interface, display and switch.

[0057] Embodiment 7:

[0058] The experimental method of the similar simulation device for the stability of the coal pillar of the underground reservoir in the mine includes the following steps:

[0059] S1. Simulation device, coal pillar for testing, acoustic wave testing system and strain testing system to be prepared for testing;

[0060] S2. Determine the simulation device to carry out the experimental simulation plan according to the experimental needs, and complete the assembly operations of the coal pillar, simulation device, acoustic wave detection system and strain test system;

[0061] S3. According to the simulation scheme of the simulation device, the pressure size and pressure direction of the coal pillar experiment are adjusted by using the simulation device, and the coal pillar experiment data are accurately tested by using the measuring mechanism in 5 sections;

[0062] Among them, the acoustic wave detection system includes an acoustic emission probe and an acoustic emission collector; the strain testing system includes a strain gauge and a strain collector.

[0063] Working principle:

[0064] According to the needs of coal pillar stability detection, a coal pillar of suitable size and specification is made in advance, and then the strain gauge is installed on the coal pillar, and the acoustic emission probe is arranged, and the coal pillar is placed on the loading assembly 1, and the state of the measuring mechanism 5 is adjusted according to the experimental needs. Thereafter, the installed coal pillar is transported to the inside of the loading assembly 1 by the lifting mechanism 2, and the coal pillar is subjected to a pressurization test by the pressurization assembly 2;

[0065] During installation, the coal pillar is placed on the top of the pad 15, and the strain gauge and the acoustic emission probe are set on the coal pillar. According to the experimental detection needs, the partition plates 510 of appropriate number and position are selected for installation, and the partition plates 510 are inserted into the preset position between the upper end plugging plate 52 and the bottom plugging plate 57, and then the sleeve rod 533 is rotated to make the clamping plate 532 move downward to clamp the partition plates 510. At this time, the upper end plugging plate 52 is in conflict with the side of the pressure plate 17, and the bottom plugging plate 57 is in conflict with the side of the pad 15. The partition plates 510 are distributed in sequence along the length direction of the coal pillar, so that the partition plates after installation 510 separates the upper end plugging plate 52 and the bottom plugging plate 57 to form a plurality of detection cavities distributed in sequence, so as to detect the seepage erosion state at different positions of the detection end of the coal pillar, and then connects the acoustic emission interface 55 with the adjacent acoustic emission probe and the acoustic emission collector, and connects the strain gauge with the strain collector through the strain collection interface 56, so as to collect the strain force and crack information of the coal pillar during the experiment, and at this time, the seepage erosion state of the current detection cavity is determined according to the flow of the water pipe 54 at the top of the detection cavity formed by the separation and the water pipe 13 connected to the butt pipe 59 at the bottom of the detection cavity;

[0066] During the pressure test, the push unit 1 22 and the push unit 2 24 are used to move the cover plate 26, the pressurizing assembly 3 and the measuring mechanism 5 downward, and the cover plate 26 drives the pull rod 27 and the connecting plate 16 to move downward. When the measuring mechanism 5 moves downward, the butt joint 59 on the bottom plugging plate 57 extends into the adjacent bottom water pipe 2 13 and finally sleeves. At this time, the cover plate 26 covers the box body 11, and a sealing structure is formed between the cover plate 26 and the pad 15, the vertical plate 14, the coal pillar, the pressure plate 17, the extension plate 39, the deflection shaft 311 and the plugging mechanism 4, so that the front end of the coal pillar is in a plugged state. In order to ensure the seal, the extension plate 39, the deflection shaft 311 and the pad 15 are of the same length, and the distance between the two sets of vertical plates 14 is consistent with the length of the pad 15;

[0067] During the pressure test, the extension plate 39 is first placed in a vertical state to facilitate clamping and conveying of the coal pillar. Thereafter, the inclination angle of the extension plate 39 is adjusted according to the pressure direction of the pressure load. At this time, the motor on the drive unit 37 is started, driving the gear to rotate. Then, under the action of the rack 33, the slide 35 slides along the length direction of the guide plate 31. At this time, the deflection shaft 311 at the bottom of the extension plate 39 is deflected along the axis of the slide groove 18 to adjust the inclination direction of the extension plate 39, thereby adjusting the pressure test in different directions. Thereafter, the pressure unit 310 is started to perform the pressure test operation, and then the experimental data of the pressure test is collected;

[0068] When the inclination angle of the extension plate 39 is adjusted, the extension plate 39 drives the docking rod 43 to move, and then the docking rod 43 deflects in the receiving groove 42 of the support plate 41, and at the same time pushes the support plate 41 to slide along the length direction of the cover plate 26, and the sealing plates 45 arranged at the bottom and top of the cover plate 26 seal the sliding channel 44 on the cover plate 26;

[0069] This design adopts a separated detection method at the end of the coal pillar test, which can detect the seepage erosion state of different intervals of the coal pillar under pressurization, facilitate sampling and analysis of the properties of the coal pillar, and change the inaccurate test of the single seepage erosion state at the output end of the traditional pressurization process. During the pressurization test, it can simulate load conditions of different directions and sizes under natural conditions, especially simulate lateral pressurization test conditions, simulate the test pressure permeability and crack development state of the coal pillar under different conditions, so as to facilitate the experimenters to conduct experimental detection of the coal pillar and provide data support for the construction and long-term safe operation of the coal mine underground water reservoir system.

[0070] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A similar simulation device for the stability of coal pillars in underground reservoirs of mines, characterized in that: It includes a loading component, the outer side of the loading component is connected to a lifting mechanism, the lifting mechanism is connected to a pressurizing component connected to the loading component, the pressurizing component is connected to a blocking mechanism connected to the lifting mechanism, and the lifting mechanism is connected to a measuring mechanism; The pressurizing assembly includes a movable plate connected to the output end of the lifting mechanism, a guide plate with an arc-shaped structure is fixedly connected to the bottom of the movable plate, an inwardly recessed groove is provided on the inner concave surface of the bottom of the guide plate, a rack with an arc-shaped structure is fixedly connected to the inner side wall of the top of the groove, sliding seats with U-shaped structure are slidably connected on both sides of the guide plate, an H-shaped stabilizing frame is fixedly connected between the bottoms of the two groups of sliding seats, an extension plate with a T-shaped structure is slidably connected to the inner side wall of the bottom opening of the stabilizing frame, pressurizing units fixed to the stabilizing frame are installed on both sides of the extension plate, the stabilizing frame is connected to a driving unit meshing with the rack, and a deflection shaft slidably connected to the loading assembly is fixedly connected to the bottom of the extension plate.

2. The similarity simulation device for the stability of coal pillars in underground reservoirs of a mine as claimed in claim 1, characterized in that: The loading assembly includes a box body with an opening on the top, vertical plates are fixedly connected to the inner side walls on both sides of the box body, a pad is arranged between the two groups of vertical plates, a connecting plate connected to the lifting mechanism is fixedly connected to one side of the pad, a pressure plate for pressurizing the coal pillar is arranged on the top of the pad, a slide groove 1 which is slidably connected to the pressurizing assembly is arranged on the top of the pressure plate, a water pipe 1 is fixedly connected to one side of the bottom of the box body, and two water pipes distributed sequentially along the length direction of the bottom plate are fixedly connected to the other side of the bottom of the box body.

3. The similarity simulation device for the stability of coal pillars in underground reservoirs of a mine as claimed in claim 1, characterized in that: The lifting mechanism includes a support frame fixedly connected to the loading assembly, a pushing unit 1 is fixedly connected to the top of the support frame, a base plate is fixedly connected to the bottom output end of the pushing unit 1, a pushing unit 2 fixedly connected to the top of the movable plate is fixedly connected to the bottom of the base plate, a pull rod 1 fixed to the bottom of the base plate is installed on both sides of the pushing unit 2, a cover plate is fixedly connected to the bottom of the pull rod 1, and the cover plate is slidably connected to the blocking mechanism, a pull rod 2 fixed to the loading assembly is fixedly connected to the bottom of the cover plate, and the cover plate is fixedly connected to the top of the measuring mechanism.

4. The similarity simulation device and experimental method for the stability of coal pillars in underground reservoirs of mines as claimed in claim 3, characterized in that: The top of the cover plate is penetrated by an extension channel for extending the measuring component, and a blocking mechanism is arranged on one side of the opening of the extension channel, and the cover plate is fixedly connected to a water pipe three.

5. The similarity simulation device and experimental method for the stability of coal pillars in underground reservoirs of mines as claimed in claim 1, characterized in that: The blocking mechanism includes a support plate, which has a cylindrical storage groove running through it. The storage groove is slidably connected to a cylindrical docking rod, which runs through a sliding channel slidably sleeved with an extension plate. The top and bottom of the support plate away from the measuring mechanism are fixed with sealing plates.

6. The similarity simulation device and experimental method for the stability of coal pillars in underground reservoirs of mines as claimed in claim 1, characterized in that: The measuring mechanism includes a carrying plate fixed to the lifting mechanism, an upper sealing plate fixed to one side of the carrying plate, the upper sealing plate fixed to clamping units distributed in sequence along its length direction, a detection connection unit fixed to the upper sealing plate is installed on one side of the clamping unit, a bottom sealing plate fixed to the carrying plate is arranged at the bottom of the upper sealing plate, a transition groove distributed along its length direction is opened at the bottom of the bottom sealing plate, a docking tube arranged in sequence along the length direction of the bottom sealing plate is fixed to the inner side wall at the top of the transition groove, and a partition plate distributed along the length direction of the bottom sealing plate is arranged between the bottom sealing plate and the upper sealing plate.

7. The similar simulation device and experimental method for the stability of coal pillars in underground reservoirs of mines as claimed in claim 6, characterized in that: The detection connection unit includes a water pipe four fixedly connected to the upper end sealing plate, an acoustic emission interface and a strain collection interface. The upper end sealing plate, the bottom sealing plate and the partition plate are all installed with sealing strips on one side away from the bearing plate.

8. The similarity simulation device and experimental method for the stability of coal pillars in underground reservoirs of mines as claimed in claim 6, characterized in that: The clamping unit includes a long strip-shaped receiving groove opened at the bottom of the upper end sealing plate, the receiving groove is slidably connected to a U-shaped clamping plate with a bottom opening, and the top of the clamping plate is rotatably connected to an adjusting rod threadedly sleeved with the upper end sealing plate.

9. The similarity simulation device and experimental method for the stability of coal pillars in underground reservoirs of mines as claimed in claim 1, characterized in that: The driving unit comprises a motor fixedly connected to the top of the stabilizing frame, an output end of the motor is connected to a driving shaft, the driving shaft is connected to the top of the stabilizing frame through a bearing seat, and an outer ring of the driving shaft is fixedly sleeved with a gear meshing with a rack.

10. The experimental method of the similar simulation device for the stability of coal pillars in underground reservoirs of mines according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Simulation device, coal pillar for testing, acoustic wave testing system and strain testing system to be prepared for testing; S2. Determine the simulation device to carry out the experimental simulation plan according to the experimental needs, and complete the assembly operations of the coal pillar, simulation device, acoustic wave detection system and strain test system; S3. According to the simulation scheme of the simulation device, the pressure size and direction of the coal pillar experiment are adjusted by using the simulation device, and the coal pillar experiment data are accurately tested in sections by using the measuring mechanism.

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