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

Abstract

The present application relates to the technical field of coal pillar stability test, and discloses a similar simulation device and experimental method for coal pillar stability of a mine underground reservoir, comprising a loading assembly, a lifting mechanism connected to the outside of the loading assembly, a pressurizing assembly connected to the loading assembly, a sealing mechanism connected to the pressurizing assembly, and a measuring mechanism connected to the lifting mechanism. The present application facilitates sampling and analysis of the properties of the coal pillar, changes the single detection of the seepage erosion state test at the output end of the traditional pressurization process, and simulates the pressure test permeability and fracture development state of the coal pillar under different conditions, facilitating experimental personnel to conduct experimental detection of the coal pillar and providing data support for the construction and long-term safe operation of the coal mine underground reservoir system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal pillar stability test, in particular to a similar simulation device and experimental method for coal pillar stability of a mine underground reservoir. BACKGROUND

[0002] The water conservation mining concept of establishing an underground reservoir in a coal mine goaf can not only realize storage and calling of mine water, but also can use the gangue collapsed in the goaf to filter, precipitate, adsorb and ion exchange the mine water for self-purification treatment, thereby solving the problems of low efficiency, poor benefit and low resource recovery rate existing in the traditional water conservation mining technology (filling mining, strip mining, high-limit mining, etc.). However, in the construction process of the mine underground reservoir, the residual coal pillar of the working face is affected by multiple mining stresses, and the residual coal pillar is in a complex stress environment of superimposed dynamic and static loads such as lateral support pressure of broken roof, overburden pressure and mine shock (caused by large-scale collapse of surrounding room-type goaf or large-area collapse of thick and hard roof caused by mining in the mine, etc.). In addition, the water invasion will also have a strong weakening effect on the residual coal pillar. Water-rock interaction has always been the focus of rock mechanics research. The water invasion will reduce the mechanical properties of coal and rock and change the morphology of crack propagation.

[0003] In the process of similar simulation test of the coal pillar, the action of water and stress on the coal pillar in the natural environment needs to be simulated. In the existing test device, the coal pillar simulation test is carried out by using the forward pressure test and the way of collecting seepage water on the side of the coal pillar. Since the stress direction and size of the coal pillar under natural conditions are inconsistent, the coal pillar test requirements under different direction stress loading cannot be effectively simulated, and the seepage state of the coal pillar cannot be accurately collected. Therefore, a similar simulation device and experimental method for coal pillar stability of a mine underground reservoir are provided. SUMMARY

[0004] In order to solve the technical problems that the coal pillar test requirements under different direction stress loading cannot be effectively simulated, and the seepage state of the coal pillar cannot be accurately collected, the present application provides a similar simulation device and experimental method for coal pillar stability of a mine underground reservoir.

[0005] The present application adopts the following technical scheme: a similar simulation device for coal pillar stability of a mine underground reservoir, comprising a loading assembly, a lifting mechanism connected to the outside of the loading assembly, a pressurizing assembly connected to the loading assembly and connected to the lifting mechanism, a plugging mechanism connected to the lifting mechanism and connected to the pressurizing assembly, and a measuring mechanism connected to the lifting mechanism.

[0006] The pressing assembly comprises a movable plate connected with the output end of the lifting mechanism, the bottom of the movable plate is fixedly connected with a guide plate in an arc structure, the inner recessed surface of the bottom of the guide plate is provided with an inwardly recessed groove, the top inner side wall of the groove is fixedly connected with a rack in an arc structure, the two sides of the guide plate are slidingly connected with a U-shaped sliding seat, the two groups of sliding seats are fixedly connected with a H-shaped stable frame between the bottoms, the inner side wall of the opening at the bottom of the stable frame is slidingly connected with a T-shaped extension plate, the two sides of the extension plate are provided with a pressing unit fixedly connected with the stable frame, the stable frame is connected with a driving unit engaged with the rack, and the bottom of the extension plate is fixedly connected with a deflection shaft slidingly connected with the loading assembly.

[0007] Through the above technical scheme, the strain gauge is installed on the coal column, the acoustic emission probe is arranged, the coal column is placed on the loading assembly, the state of the measuring mechanism is adjusted according to the experimental needs, and then the installed coal column is conveyed into the loading assembly by the lifting mechanism, and the coal column is subjected to pressure test by the pressing assembly.

[0008] As a further improvement of the above scheme, the loading assembly comprises a box body provided with an opening at the top, the inner side walls of the two adjacent sides of the box body are fixedly connected with vertical plates, a pad plate is arranged between the two groups of vertical plates, one side of the pad plate is fixedly connected with a connecting plate connected with the lifting mechanism, a pressing plate for pressing the coal column is arranged at the top of the pad plate, a sliding groove one slidingly connected with the pressing assembly is formed in the top of the pressing plate, a water pipe one is fixedly connected to one side of the bottom of the box body, and a water pipe two is fixedly connected to the other side of the bottom of the box body and is distributed along the length direction of the bottom plate.

[0009] Through the above technical scheme, the loading and placement of the coal column are realized, and the two sides of the coal column are separated, so as to avoid overflow of the experimental permeation liquid from the position outside the coal column, and improve the test progress and effect.

[0010] As a further improvement of the above scheme, the lifting mechanism comprises a support frame fixedly connected with the loading assembly, a pushing unit one is fixedly connected to the top of the support frame, a base plate is fixedly connected to the output end of the bottom of the pushing unit one, a pushing unit two is fixedly connected to the top of the movable plate, a pull rod one is fixedly connected to the bottom of the base plate and is installed on the two sides of the pushing unit two, a cover plate is fixedly connected to the bottom of the pull rod one and is slidingly connected with the sealing mechanism, a pull rod two is fixedly connected to the loading assembly and is fixedly connected to the bottom of the cover plate.

[0011] Through the above technical scheme, the lifting operation of the loading assembly and other components is realized, and after the box body of the loading assembly is assembled and installed outside, it is conveyed into the box body for test, so as to facilitate the installation and debugging operation of the test personnel.

[0012] As a further improvement of the above scheme, the top of the cover plate penetrates an extension channel for the extension of the measuring assembly, the sealing mechanism is arranged on one side of the opening of the extension channel, and the cover plate is fixedly connected with a water pipe three.

[0013] As a further improvement of the above scheme, the sealing mechanism comprises a supporting plate, a receiving groove of a cylindrical structure is formed through the supporting plate, a butt joint rod of a cylindrical structure is slidably connected to the receiving groove, a sliding channel slidably connected to the extension plate is formed through the butt joint rod, and a sealing plate is fixed to the top and bottom of the side of the supporting plate away from the measuring mechanism.

[0014] Through the above technical scheme, when the inclination angle of the extension plate is adjusted, the extension plate drives the butt joint rod to move, and then the butt joint rod is deflected in the receiving groove of the supporting plate, and the sealing plate arranged at the bottom and top of the cover plate seals the sliding channel on the cover plate.

[0015] As a further improvement of the above scheme, the measuring mechanism comprises a bearing plate fixed to the lifting mechanism, an upper end sealing plate is fixed to one side of the bearing plate, a clamping unit is arranged on the upper end sealing plate in sequence along the length direction of the upper end sealing plate, a detection connection unit fixed to the upper end sealing plate is arranged on one side of the clamping unit, a bottom sealing plate fixed to the bearing plate is arranged at the bottom of the upper end sealing plate, a transition groove distributed along the length direction of the bottom sealing plate is formed at the bottom of the bottom sealing plate, a butt joint pipe arranged in sequence along the length direction of the bottom sealing plate is fixed to the inner side wall of 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 end sealing plate.

[0016] Through the above technical scheme, the partition plate is inserted into the preset position between the upper end sealing plate and the bottom sealing plate, and then the clamping plate is moved downward by rotating the sleeve rod to clamp the partition plate. At this time, the upper end sealing plate abuts against the side edge of the pressing plate, the bottom sealing plate abuts against the side edge of the backing plate, and the partition plate is arranged in sequence along the length direction of the coal column. The partition plate separates the upper end sealing plate and the bottom sealing plate to form a plurality of detection cavities arranged in sequence after installation, so that the seepage erosion state of the coal column at different positions of the detection end is detected.

[0017] As a further improvement of the above scheme, the detection connection unit comprises a water pipe four, an acoustic emission interface, and a strain acquisition interface fixed to the upper end sealing plate, and a sealing strip is arranged on the side of the upper end sealing plate, the bottom sealing plate, and the partition plate away from the bearing plate.

[0018] Through the above technical scheme, the strain gauge for testing is connected with the strain acquisition device, and the acoustic emission probe is connected with the acoustic emission acquisition device.

[0019] As a further improvement of the above scheme, the clamping unit comprises an elongated structure receiving groove formed at the bottom of the upper end sealing plate, a U-shaped structure clamping plate with an open bottom is slidably connected to the receiving groove, and an adjusting rod is threadedly connected to the upper end sealing plate and rotatably connected to the top of the clamping plate.

[0020] As a further improvement of the above scheme, the driving unit comprises a motor fixed to the top of the stable frame, a driving shaft connected to the output end of the motor, and a gear meshing with the rack fixed to the outer ring of the driving shaft and connected to the top of the stable frame through a bearing seat.

[0021] An experimental method of a similar simulation device for coal pillar stability of a mine underground reservoir, comprising the following steps:

[0022] S1, preparing the simulation device to be tested, the detection coal pillar, the acoustic wave detection system and the strain test system;

[0023] S2, determining the simulation scheme of the simulation device according to the experimental needs, and assembling the complete coal pillar, the simulation device, the acoustic wave detection system and the strain test system;

[0024] S3, according to the simulation scheme of the simulation device, adjusting the pressure size and direction of the coal pillar experiment by using the simulation device, and accurately testing the coal pillar experiment data by using the measuring mechanism.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] 1, the present application adopts the separation 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 pressure, and is convenient for sampling and analyzing the properties of the coal pillar, and changes the single detection of the seepage erosion state test at the output end of the traditional pressure process.

[0027] 2, the present application can simulate the load conditions of different directions and sizes under natural conditions during the pressure test, especially the lateral pressure test conditions, simulate the pressure penetration and fracture development state of the coal pillar under different conditions, and facilitate the experimental personnel to detect the coal pillar, and provide data support for the construction and long-term safe operation of the coal mine underground reservoir system. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structure schematic view of the similar simulation device for coal pillar stability of a mine underground reservoir is provided for the present application;

[0029] Figure 2 The structure schematic view of the pressure assembly is provided for the present application;

[0030] Figure 3 The structure schematic view of the guide plate is provided for the present application;

[0031] Figure 4 The structure schematic view of the loading assembly is provided for the present application;

[0032] Figure 5 The structure schematic view of the measuring mechanism is provided for the present application;

[0033] Figure 6 A side view of the measuring mechanism provided by the present application is shown in the figure;

[0034] Figure 7 A structural schematic view of the cover plate provided by the present application is shown in the figure;

[0035] Figure 8 A structural schematic view of the plugging mechanism provided by the present application is shown in the figure.

[0036] Main symbol explanation:

[0037] 1, loading assembly; 2, lifting mechanism; 3, pressurizing assembly; 4, plugging mechanism; 5, measuring mechanism; 11, box body; 12, water pipe one; 13, water pipe two; 14, vertical plate; 15, pad plate; 16, connecting plate; 17, pressing plate; 18, sliding groove one; 21, support frame; 22, pushing unit one; 23, base plate; 24, pushing unit two; 25, pull rod one; 26, cover plate; 27, pull rod two; 28, extension channel; 31, guide plate; 32, groove; 33, rack; 34, movable plate; 35, sliding seat; 36, stabilizing frame; 37, driving unit; 39, extension plate; 310, pressurizing unit; 311, deflection shaft; 41, supporting plate; 42, storage groove; 43, butt joint rod; 44, sliding channel; 45, sealing plate; 51, bearing plate; 52, upper end plugging plate; 53, clamping unit; 54, water pipe four; 55, acoustic emission interface; 56, strain acquisition interface; 57, bottom plugging plate; 58, transition groove; 59, butt joint pipe; 510, partition plate; 531, containing groove; 532, clamping plate; 533, adjusting rod. DETAILED DESCRIPTION

[0038] In the following, the present application will be further described in conjunction with the drawings and the specific embodiments, and it should be noted that, under the premise of no conflict, the following described embodiments or technical features can be combined in any manner to form new embodiments.

[0039] Embodiment 1:

[0040] Please combine Figures 1-8 The similar simulation device for the stability of the coal pillar of the underground reservoir of the mine of the present embodiment comprises a loading assembly 1, the outer side of the loading assembly 1 is connected with a lifting mechanism 2, the lifting mechanism 2 is connected with a pressurizing assembly 3 connected with the loading assembly 1, the pressurizing assembly 3 is connected with a plugging mechanism 4 connected with the lifting mechanism 2, and the lifting mechanism 2 is connected with a measuring mechanism 5.

[0041] The pressing assembly 3 comprises a movable plate 34 connected with the output end of the lifting mechanism 2, the bottom of the movable plate 34 is fixedly connected with a guide plate 31 in a circular arc structure, the bottom of the guide plate 31 is provided with a recess 32 recessed inward, the top of the recess 32 is fixedly connected with a rack 33 in a circular arc structure, the two sides of the guide plate 31 are slidably connected with two U-shaped sliding seats 35, the bottom of the two sliding seats 35 is fixedly connected with a stable frame 36 in an H-shaped structure, the bottom of the stable frame 36 is slidably connected with an extension plate 39 in a T-shaped structure, the two sides of the extension plate 39 are provided with two pressing units 310 fixedly connected with the stable frame 36, the stable frame 36 is connected with a driving unit 37 engaged with the rack 33, and the bottom of the extension plate 39 is fixedly connected with a deflection shaft 311 slidably connected with the loading assembly 1.

[0042] The implementation principle of the similar simulation device and experimental method for the stability of the coal pillar of the underground reservoir in the coal mine in the embodiment of the 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, the state of the measuring mechanism 5 is adjusted according to the experimental requirements, then the installed coal pillar is conveyed into the loading assembly 1 by the lifting mechanism 2, and the coal pillar is subjected to a pressure test by the pressing assembly 2.

[0043] Embodiment 2:

[0044] The further improvement of the embodiment based on the embodiment 1 is that the loading assembly 1 comprises a box body 11 provided with an opening at the top, the inner side walls of the two adjacent sides of the box body 11 are fixedly connected with two vertical plates 14, the two vertical plates 14 are provided with a pad 15 therebetween, one side of the pad 15 is fixedly connected with a connecting plate 16 connected with the lifting mechanism 2, the top of the pad 15 is provided with a pressing plate 17 for pressing the coal pillar, the top of the pressing plate 17 is provided with a sliding groove 18 slidably connected with the pressing assembly 3, one side of the bottom of the box body 11 is fixedly connected with a water pipe 12, and the other side of the bottom of the box body 11 is fixedly connected with the water pipe 13 distributed along the length direction of the bottom plate 15.

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

[0046] The top of the cover plate 26 penetrates an extension channel 28 for the extension of the measuring assembly 5, and the sealing mechanism 4 is arranged on one side of the opening of the extension channel 28, and the cover plate 26 is fixedly connected with a water pipe 3.

[0047] Embodiment 3:

[0048] The further improvement based on embodiment 1 is that the blocking mechanism 4 comprises a supporting plate 41, the supporting plate 41 is penetrated by a cylindrical structure receiving groove 42, the receiving groove 42 is slidingly connected with a cylindrical structure butt joint rod 43, the butt joint rod 43 is penetrated by a sliding channel 44 which is slidingly sleeved with the extension plate 39, the top and bottom of the side of the supporting 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 slidingly connected with the two groups of sealing plates 45.

[0049] Embodiment 4:

[0050] The measuring mechanism 5 comprises a bearing plate 51 fixedly connected with the cover plate 26 of the lifting mechanism 2, one side of the bearing plate 51 is fixedly connected with an upper end blocking plate 52, the upper end blocking plate 52 is fixedly connected with clamping units 53 which are distributed along the length direction of the upper end blocking plate 52 in turn, one side of the clamping unit 53 is provided with a detection connecting unit fixedly connected with the upper end blocking plate 52, the bottom of the upper end blocking plate 52 is provided with a bottom blocking plate 57 fixedly connected with the bearing plate 51, the bottom of the bottom blocking plate 57 is provided with a transition groove 58 distributed along the length direction of the bottom blocking plate 57, the inner side wall of the top of the transition groove 58 is fixedly connected with butt pipes 59 which are arranged along the length direction of the bottom blocking plate 57 in turn, and the bottom blocking plate 57 and the upper end blocking plate 52 are provided with a partition plate 510 distributed along the length direction of the bottom blocking plate 57.

[0051] The detection connecting unit comprises a water pipe 54, an acoustic emission interface 55 and a strain acquisition interface 56 fixedly connected with the upper end blocking plate 52, and the side of the upper end blocking plate 52, the bottom blocking plate 57 and the partition plate 510 away from the bearing plate 51 is provided with a sealing strip.

[0052] The clamping unit 53 comprises a long strip structure containing groove 531 provided in the bottom of the upper end blocking plate 52, the containing groove 531 is slidingly connected with a U-shaped structure clamping plate 532 with an open bottom, and the top of the clamping plate 532 is rotatably connected with an adjusting rod 533 which is threadedly sleeved with the upper end blocking plate 52.

[0053] Embodiment 5:

[0054] The driving unit 37 comprises a motor fixedly connected with the top of the stable frame 36, the output end of the motor is connected with a driving shaft, the driving shaft is connected with the top of the stable frame 36 through a bearing seat, the outer circle of the driving shaft is fixedly sleeved with a gear which is engaged with the rack 33, the pushing unit one 22 and the pushing unit two 24 adopt push rod motors, and the pressing unit 310 adopts a hydraulic cylinder.

[0055] Embodiment 6:

[0056] The side of the box body 11 is provided with a control box and a hydraulic pump, the control box is internally provided with a controller, the control box is provided with a data interface, a power interface, a display and a switch, the water pipe one 12, the water pipe two 13, the water pipe three and the water pipe four 54 are all provided with electromagnetic valves and flow meters, the hydraulic pump is connected with the hydraulic cylinder through an oil pipe, the oil pipe is provided with a pressure sensor, and the controller is connected with the motor, the push rod motor, the hydraulic pump, the pressure sensor, the electromagnetic valve, the flow meter, the data interface, the power interface, the display and the switch.

[0057] Example 7

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

[0059] S1, preparing the simulation device to be tested, the coal pillar for detection, the acoustic wave detection system and the strain test system;

[0060] S2, determining the simulation scheme of the simulation device according to the experimental needs, and assembling the complete coal pillar, the simulation device, the acoustic wave detection system and the strain test system;

[0061] S3, according to the simulation scheme of the simulation device, adjusting the pressure size and the pressure direction of the coal pillar experiment by using the simulation device, and precisely testing the coal pillar experimental data by using the measuring mechanism 5;

[0062] The acoustic wave detection system comprises an acoustic emission probe and an acoustic emission collector, and the strain test system comprises a strain gauge and a strain collector.

[0063] Working principle:

[0064] According to the need of coal pillar stability detection, a coal pillar with appropriate size is prepared in advance, then the strain gauge is installed on the coal pillar, the acoustic emission probe is arranged, the coal pillar is placed on the loading assembly 1, the state of the measuring mechanism 5 is adjusted according to the experimental needs, then the installed coal pillar is conveyed to the inside of the loading assembly 1 by using the lifting mechanism 2, and the coal pillar is subjected to a pressure test by using the pressure assembly 2;

[0065] In the installation, the coal column is placed on the top of the base plate 15, and the strain gauge and acoustic emission probe are arranged on the coal column. According to the experimental detection needs, a proper number and position of the partition plates 510 are selected for installation. The partition plate 510 is inserted into the preset position between the upper end sealing plate 52 and the bottom sealing plate 57, and then the sleeve rod 533 is rotated to make the clamping plate 532 move downward to clamp the partition plate 510. At this time, the upper end sealing plate 52 is in contact with the side edge of the pressing plate 17, and the bottom sealing plate 57 is in contact with the side edge of the base plate 15. The partition plates 510 are distributed along the length direction of the coal column in sequence, so that the partition plates 510 installed between the upper end sealing plate 52 and the bottom sealing plate 57 form a plurality of detection cavities distributed in sequence, so as to detect the seepage erosion state of the coal column at different positions of the detection end. Then, the acoustic emission interface 55 is connected with the adjacent acoustic emission probe and acoustic emission collector, and the strain gauge is connected with the strain collector through the strain collection interface 56, so as to collect the strain force and crack information of the coal column during the experiment. At this time, the seepage erosion state of the current detection cavity is determined according to the flow of the water pipe four 54 at the top of the detection cavity and the water pipe 13 connected with the bottom of the detection cavity.

[0066] In the pressure test, the push unit one 22 and the push unit two 24 are used to move the cover plate 26, the pressure assembly 3 and the measuring mechanism 5 downward. The cover plate 26 drives the pull rod two 27 and the connecting plate 16 to move downward. When the measuring mechanism 5 moves downward, the connecting pipe 59 on the bottom sealing plate 57 extends into the adjacent bottom water pipe two 13 for sleeve connection. At this time, the cover plate 26 covers on the box body 11, and a sealed structure is formed between the cover plate 26 and the base plate 15, the vertical plate 14, the coal column, the pressing plate 17, the extension plate 39, the deflection shaft 311 and the sealing mechanism 4, so that the front end of the coal column is in a sealing state. In order to ensure the sealing, the extension plate 39, the deflection shaft 311 and the base plate 15 have the same length, and the distance between the two groups of vertical plates 14 is consistent with the length of the base plate 15.

[0067] In the pressure test, the extension plate 39 is first in a vertical state to facilitate clamping and conveying of the coal column. Then, 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 driving unit 37 is started to drive the gear to rotate, and then under the action of the rack 33, the sliding seat 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 deflects along the axis of the sliding groove one 18 to adjust the inclination direction of the extension plate 39, so as to adjust the pressure test in different directions. Then, 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 abutment rod 43 to move, and then the abutment rod 43 is deflected in the receiving groove 42 of the supporting plate 41, and the supporting plate 41 is pushed to slide along the length direction of the cover plate 26, and the sealing plates 45 arranged at the bottom and the top of the cover plate 26 seal the sliding channels 44 on the cover plate 26;

[0069] The design adopts a separation detection mode at the end of the coal column test, can detect the seepage erosion state of different intervals of the coal column under pressure, is convenient for sampling and analyzing the properties of the coal column, changes the inaccurate test of the seepage erosion state of the output end in the traditional pressure process, can simulate the load conditions of different directions and sizes under natural conditions during the pressure test, especially simulates the lateral pressure test conditions, simulates the pressure test permeability and the fracture development state of the coal column under different conditions, is convenient for experimental personnel to test the coal column, and provides data support for the construction and long-term safe operation of the coal mine underground reservoir system.

[0070] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and replacements made by those skilled in the art on the basis of the present application all belong to the protection scope of the present application.

Claims

1. A similar simulation device for the stability of a coal pillar of a mine underground reservoir, characterized in that, The loading assembly is connected with a lifting mechanism outside, the lifting mechanism is connected with a pressurizing assembly connected with the loading assembly, the pressurizing assembly is connected with a sealing mechanism connected with the lifting mechanism, and the lifting mechanism is connected with a measuring mechanism; The pressurizing assembly comprises a movable plate connected with the output end of the lifting mechanism, the bottom of the movable plate is fixedly connected with a guide plate in a circular arc structure, the bottom of the guide plate is provided with an inwardly recessed groove, the top of the groove is fixedly connected with a rack in a circular arc structure, the two sides of the guide plate are slidingly connected with a U-shaped sliding seat, the two groups of sliding seats are fixedly connected with an H-shaped stable frame between the bottoms, the inside wall of the opening at the bottom of the stable frame is slidingly connected with a T-shaped extension plate, the two sides of the extension plate are provided with a pressurizing unit fixedly connected with the stable frame, the stable frame is connected with a driving unit engaged with the rack, and the bottom of the extension plate is fixedly connected with a deflection shaft slidingly connected with the loading assembly. The loading assembly comprises a box body provided with an opening at the top, the inner side walls of the two adjacent sides of the box body are fixedly connected with vertical plates, a spacer plate is arranged between the two groups of vertical plates, one side of the spacer plate is fixedly connected with a connecting plate connected with the lifting mechanism, the top of the spacer plate is provided with a pressing plate for pressurizing the coal column, the top of the pressing plate is provided with a sliding groove one slidingly connected with the pressurizing assembly, one side of the bottom of the box body is fixedly connected with a water pipe one, and the other side of the bottom of the box body is fixedly connected with water pipes two distributed along the length direction of the bottom plate. The measuring mechanism comprises a bearing plate fixedly connected with the lifting mechanism, one side of the bearing plate is fixedly connected with an upper end sealing plate, the upper end sealing plate is fixedly connected with clamping units distributed along the length direction of the upper end sealing plate, one side of the clamping units is provided with a detection connecting unit fixedly connected with the upper end sealing plate, the bottom of the upper end sealing plate is provided with a bottom sealing plate fixedly connected with the bearing plate, the bottom of the bottom sealing plate is provided with a transition groove distributed along the length direction of the bottom sealing plate, the top inside wall of the transition groove is fixedly connected with butt pipes arranged along the length direction of the bottom sealing plate, a partition plate is arranged between the bottom sealing plate and the upper end sealing plate and distributed along the length direction of the bottom sealing plate, when detection, the upper end sealing plate abuts against the side edge of the pressing plate, the bottom sealing plate abuts against the side edge of the spacer plate, and the partition plate is distributed along the length direction of the coal column, so that the partition plate separates the upper end sealing plate and the bottom sealing plate to form a plurality of detection cavities distributed in sequence, and the seepage erosion state of the coal column detection end at different positions is detected.

2. The similar simulation device for coal pillar stability of mine underground reservoir according to claim 1, characterized in that, The lifting mechanism comprises a support frame fixedly connected with the loading assembly, the top of the support frame is fixedly connected with a pushing unit one, the bottom output end of the pushing unit one is fixedly connected with a base plate, the bottom of the base plate is fixedly connected with a pushing unit two fixedly connected with the top of the movable plate, the two sides of the pushing unit two are provided with pull rods one fixedly connected with the bottom of the base plate, the bottom of the pull rod one is fixedly connected with a cover plate, the cover plate is slidingly connected with the sealing mechanism, the bottom of the cover plate is fixedly connected with a pull rod two fixedly connected with the loading assembly, and the cover plate is fixedly connected with the top of the measuring mechanism.

3. The apparatus and method according to claim 2, wherein the apparatus is characterized by: The top of the cover plate penetrates an extension channel for the extension of the measuring assembly, the sealing mechanism is arranged on one side of the opening of the extension channel, and the cover plate is fixedly connected with a water pipe three.

4. The apparatus and method according to claim 1, wherein The sealing mechanism comprises a supporting plate, a receiving groove of a cylindrical structure is formed through the supporting plate, a cylindrical structure of an abutting rod is slidably connected to the receiving groove, a sliding channel slidably connected to the extending plate is formed through the abutting rod, and a sealing plate is fixed to the top and bottom of the side of the supporting plate away from the measuring mechanism.

5. The apparatus and method of claim 1, wherein the apparatus is a scaled model of a coal pillar stability of a mine underground reservoir. The detection connecting unit comprises a water pipe four, an acoustic emission interface and a strain collection interface fixed to the upper end sealing plate, and a sealing strip is installed on the side of the upper end sealing plate, the bottom sealing plate and the partition plate away from the bearing plate.

6. The apparatus and method of claim 1, wherein the apparatus is a scaled model of a coal pillar stability of a mine underground reservoir. The clamping unit comprises a long strip-shaped receiving groove formed in the bottom of the upper end sealing plate, a U-shaped clamping plate with an open bottom slidably connected to the receiving groove, and an adjusting rod threadedly connected to the upper end sealing plate and rotatably connected to the top of the clamping plate.

7. The apparatus and method according to claim 1, wherein the apparatus is characterized by: The driving unit comprises a motor fixed to the top of the stabilizing frame, a driving shaft connected to the output end of the motor, and a gear fixed to the outer ring of the driving shaft and engaged with the rack.

8. The experimental method for the similar simulation of the coal pillar stability of the underground mine reservoir according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: S1, preparing the simulation device, the detection coal column, the acoustic wave detection system and the strain test system for testing; S2, determining the simulation scheme of the simulation device according to the experimental needs, and assembling the complete coal column, the simulation device, the acoustic wave detection system and the strain test system; S3, adjusting the pressure size and direction of the coal column experiment according to the simulation scheme of the simulation device, and using the measuring mechanism to segmentally and accurately test the coal column experiment data.

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