Experimental device for simulating pressure-bearing circulating immersion-water loss of coal pillar dam body

By designing a pressure-absorbing cyclic immersion-loss experimental device for simulated coal column dam body, using water circulation and boosting systems to simulate the cyclic immersion and pressure-bearing environment of coal column dam body, the problem that existing devices cannot simulate actual working conditions is solved, and the realization of the realization of the existing equipment is realized. More accurate coal column dam sample acquisition and research.

CN222300207UActive Publication Date: 2025-01-03INNER MONGOLIA RESEARCH INSTITUTE CHINA UNIVERSITY OF MINING AND TECHNOLOGY (BEIJING) +1
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Patent Information

Application Number
CN202421010404.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-10
Publication Date
2025-01-03
Estimated Expiration
2034-05-10

AI Technical Summary

Technical Problem

The existing experimental equipment cannot simulate the circulating water-soaking and water loss environment of the coal column dam body under the pressure state, and cannot obtain coal column dam body samples that are closer to the actual working conditions, which affects the accuracy of subsequent research.

Method used

A simulated coal column dam body pressure cycle immersion-depletion experimental device including water circulation system, immersion-depletion system and pressurization system was designed, and the pressure-depletion experimental device was used to increase the pressure-depletion experimental box, pressure gauge, pressure relief valve, water circulation system and air increase. Pressure pump simulates the circulating water immersion, water loss and pressure bearing environment of coal column dam.

Benefits of technology

The device can obtain coal column dam samples that are closer to the actual working conditions, which is conducive to subsequent feature analysis and further research, and provides more accurate simulation results.

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Abstract

The utility model belongs to the technical field of mine physical simulation experiments, and particularly relates to a simulation coal pillar dam body pressure-bearing circulation leaching-water loss experiment device which comprises a water circulation system, a leaching-water loss system and a pressurization system which are connected in sequence. The immersion-water loss system comprises a closed experiment box, a pressure gauge, a pressure relief valve and a sealing door; the water circulation system comprises a water return tank, a water injection tank, a water suction pump and a water guide pipe; and the pressurization system is connected with the closed experiment box. According to the utility model, the closed experiment box is arranged for the coal pillar dam body sample, and the water return tank and the water injection tank which are connected with the closed experiment box are respectively arranged to circularly inject water into or discharge water from the closed experiment box, so as to simulate the circulating water immersion and water loss environment of the coal pillar dam body; meanwhile, an air booster pump connected with the closed experiment box is also arranged to boost the pressure in the closed experiment box, so that the pressure-bearing environment of the coal pillar dam body is simulated; according to the utility model, a coal pillar dam body sample closer to an actual working condition can be obtained, and subsequent characteristic analysis and further research are facilitated.
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Description

Technical Field

[0001] The utility model belongs to the technical field of mine physical simulation experiments, and particularly relates to a device for simulating a coal pillar dam body pressure-bearing cycle immersion-water loss experiment. Background Art

[0002] When constructing underground space in coal mines (such as underground reservoirs), a coal pillar dam needs to be reserved. Under the influence of static loads and long-term cyclic immersion and dehydration, the coal pillar dam will produce many microcracks. These microcracks will continue to develop, expand and penetrate over time, thus affecting the long-term stability of the coal pillar dam. Therefore, controlling the stability of the coal pillar dam has become the key to the construction and long-term safe operation of underground space in coal mines. In view of this, it is particularly important to study the characteristics of the coal pillar dam under pressure after being affected by cyclic immersion-dehydration conditions for a long time.

[0003] The existing experimental device mainly places the coal pillar dam body sample in a water tank set with a constant water level, and then conducts a long-term immersion experiment on the coal pillar dam body sample, and then studies the characteristics of the coal pillar dam body after long-term immersion. However, this experimental device cannot simulate the pressure-bearing state of the coal pillar dam body in actual operation, nor can it reproduce the environment of cyclic immersion and dehydration, and thus cannot obtain coal pillar dam body samples that are closer to actual working conditions, which affects the accuracy of subsequent research. Therefore, there is an urgent need for an experimental device that can simulate the long-term pressure-bearing environment of the coal pillar dam body and is affected by cyclic immersion-dehydration. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a simulated coal pillar dam pressure cycle immersion-dehydration experimental device, which can obtain coal pillar dam body samples closer to actual working conditions, which is conducive to subsequent characteristic analysis and further research. Specifically, the experimental device includes a water circulation system, an immersion-dehydration system and a pressurization system connected in sequence; the immersion-dehydration system includes a closed experimental box, a pressure gauge, a pressure relief valve and a sealing door, the top of the closed experimental box is provided with an openable and closable sealing door, the closed experimental box is provided with a plurality of pressure gauges for measuring the pressure at different positions in the closed experimental box, and the pressure relief valve is arranged at the top of the closed experimental box;

[0005] The water circulation system comprises a return water tank, a water injection tank, a water pump and a water guide pipe; a return water tank outlet is arranged at the left bottom of the return water tank, the return water tank outlet is connected to the water inlet of the water pump through the water guide pipe, the water outlet of the water pump is connected to the water inlet of the water injection tank at the upper left part of the water injection tank through the water guide pipe, a water injection tank outlet is arranged at the right bottom of the water injection tank, the water injection tank outlet is connected to the upper left part of the closed experimental box through a first connecting pipe, and a water injection valve is arranged on the first connecting pipe; a return water tank inlet is arranged at the top of the right side of the return water tank, the return water tank inlet is connected to the left bottom of the closed experimental box through a second connecting pipe, and a drain valve is arranged on the second connecting pipe;

[0006] The pressurization system is connected to the closed experimental box.

[0007] Preferably, the pressure gauge comprises a first pressure gauge and a second pressure gauge, the measuring port of the first pressure gauge is connected to the top of the inner cavity of the closed experimental box, and the measuring port of the second pressure gauge is connected to the bottom of the inner cavity of the closed experimental box.

[0008] Preferably, the closed experimental box, the return water tank and the water injection tank are rectangular boxes.

[0009] Preferably, a filter is provided at the water outlet of the return water tank.

[0010] Preferably, a rectangular support frame is provided on the top surface of the return water tank, and a water injection tank is placed on the upper part of the support frame.

[0011] Preferably, the water pump is arranged in the support frame.

[0012] Preferably, the immersion-dehydration system and the pressurization system are arranged on a base.

[0013] Preferably, the boosting system includes an air boosting pump and an air duct, and the air boosting pump is connected to the right side of the top of the closed experimental box through the air duct.

[0014] Preferably, the air booster pump is provided with a switch for starting and stopping the controller.

[0015] Preferably, a pressurizing valve is provided at the right side where the air duct is connected to the top of the closed experimental box.

[0016] Preferably, the water circulation system, immersion-dehydration system and pressurization system are arranged in the experimental cabin.

[0017] Beneficial effects: The utility model sets up a closed test box for the coal pillar dam body sample, and water or drainage can be circulated into the closed test box by respectively setting up a return water box and a water injection box connected to the closed test box, so as to simulate the cyclic immersion and water loss environment of the coal pillar dam body; at the same time, an air booster pump connected to the closed test box is also set to increase the pressure therein, so as to simulate the pressure-bearing environment of the coal pillar dam body; the utility model can obtain coal pillar dam body samples that are closer to actual working conditions, which is conducive to subsequent characteristic analysis and further research. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention and make it easier to understand, the following is a brief description of the drawings required for use in the implementation. Obviously, the following drawings are only some implementations of the present invention. These drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0019] Figure 1 This is a schematic diagram of a new type of test device for simulating the pressure-bearing cycle immersion-water loss of a coal pillar dam;

[0020] In the figure, the corresponding relationship between the component names and the figure numbers is as follows:

[0021] 1-experimental cabin, 2-water circulation system, 3-immersion-dehydration system, 4-boosting system, 5-water injection valve, 6-drain valve, 7-coal pillar dam body sample, 8-base; 21-return water tank, 22-water injection tank, 23-water pump, 24-water pipe, 25-filter, 26-support frame; 31-closed experimental box, 32-first pressure gauge, 33-second pressure gauge, 34-pressure relief valve, 35-sealed door; 41-air booster pump, 42-air pipe, 43-pressurization valve, 44-start-stop switch. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] like Figure 1 As shown, a simulated coal pillar dam pressure cycle immersion-dehydration test device of the utility model comprises a water circulation system 2, an immersion-dehydration system 3 and a boosting system 4 connected in sequence; the immersion-dehydration system 3 and the boosting system 4 are arranged on a base 8; the immersion-dehydration system comprises a closed test box 31, a pressure gauge, a pressure relief valve 34 and a sealing door 35, the closed test box 31 is preferably a rectangular box, the top of the closed test box 31 is provided with a sealing door 35 that can be opened and closed, the closed test box 31 is provided with a plurality of pressure gauges for measuring the pressure at different positions in the closed test box 31, in this embodiment, the pressure gauge comprises a first pressure gauge 32 and a second pressure gauge 33, the measuring port of the first pressure gauge 32 is connected to the top of the inner cavity of the closed test box 31, and the measuring port of the second pressure gauge 33 is connected to the bottom of the inner cavity of the closed test box 31; the pressure relief valve 34 is arranged at the top of the closed test box 31;

[0024] The water circulation system 2 comprises a return water tank 21, a water injection tank 22, a water pump 23, a water guide pipe 24, a filter screen 25 and a support frame 26; the return water tank 21 and the water injection tank 22 are preferably rectangular parallelepiped boxes, a rectangular parallelepiped support frame 26 is arranged on the top surface of the return water tank 21, the water injection tank 22 is placed on the upper part of the support frame 26, a return water tank outlet is arranged at the bottom left side of the return water tank 21, the return water tank outlet is connected to the water inlet end of the water pump 23 through the water guide pipe 24, the water outlet end of the water pump 23 is connected to the water inlet of the water injection tank at the upper left side of the water injection tank 22 through the water guide pipe 24, and a water injection tank outlet is arranged at the bottom right side of the water injection tank. The water outlet of the water injection tank is connected to the upper left side of the closed test box 31 through a first connecting pipe, and a water injection valve 5 is arranged on the first connecting pipe, so that the water in the water injection tank 22 can flow into the closed test box 31 by gravity; the top right side of the return water tank 21 is provided with a return water tank inlet, and the return water tank inlet is connected to the bottom left side of the closed test box 31 through a second connecting pipe, and a drain valve 6 is arranged on the second connecting pipe, so that the water in the closed test box 31 can all flow into the return water tank 21 by gravity; the filter screen 25 is arranged at the water outlet of the return water tank; the water pump 23 is arranged in the support frame 26;

[0025] The boosting system 4 includes an air boosting pump 41, an air duct 42, a pressurizing valve 43, and a start-stop switch 44. The air boosting pump 41 is provided with a controller start-stop switch 44. The air boosting pump 41 is connected to the top right side of the closed experimental box 31 through the air duct 42, and a pressurizing valve 43 is provided at the connection.

[0026] Among them, the water circulation system 2, the immersion-dehydration system 3 and the pressurization system 4 can be arranged in the experimental cabin 1.

[0027] The method of using the utility model is as follows:

[0028] Step 1: Obtain the coal blocks of the coal pillar dam body by means of on-site drilling and other means, and then process them into coal pillar dam body samples 7 in the laboratory;

[0029] Step 2: Open the sealing door 35, keep the water injection valve 5, the steam trap 6 and the pressure valve 43 in a closed state, put the coal pillar dam body sample 7 into the bottom surface of the closed test box 31, and close the sealing door 35;

[0030] Step 3: Open the water injection valve 5, and the water in the water storage tank 22 enters the closed test box 31 from the first connecting pipe. After reaching the designed water level, close the water injection valve 5. The designed water level can submerge the entire coal pillar dam body sample 7 in water;

[0031] Step 4: Turn on the start-stop switch 44, open the air booster pump 41 and the pressure valve 43, input gas into the closed test box 31 to increase the pressure in the closed test box 31 to reach the set pressure, and close the air booster pump 41 and the pressure valve 43;

[0032] Step 5: After reaching one cycle of immersion time, open the steam trap 6, drain the water in the closed test box 31 completely into the return water tank 21, and then close the steam trap 6;

[0033] Preferably, after closing the steam trap 6, the fifth step further includes opening the air booster pump 41 and the pressure valve 43, inputting gas into the closed test box 31 to increase the pressure in the closed test box 31 to reach the set pressure (discharging water causes the pressure in the closed test box 31 to be slightly reduced), and closing the air booster pump 41 and the pressure valve 43;

[0034] Step 6: Turn on the water pump 23 to filter the water in the return water tank 21 through the filter 25 and then pump it into the water storage tank 22, and then turn off the water pump 23;

[0035] Step 7: After reaching the water loss time of one cycle, the pressure relief valve 34 is opened, and the pressure relief valve 34 is closed after the air pressure in the closed test box 31 returns to the standard air pressure;

[0036] Step 8: Repeat the operations of steps 3 to 7 in a cycle. After the set number of cycles of immersion-dehydration or time is completed, the pressure relief valve 34 is opened. After the air pressure returns to the standard pressure, the airtight door 35 is opened to take out the test piece, thereby completing the simulated coal pillar dam pressure cyclic immersion-dehydration experiment.

[0037] 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 device for simulating the pressure-bearing cyclic immersion-dehydration test of a coal pillar dam, characterized in that: It includes a water circulation system, an immersion-dehydration system and a pressurization system connected in sequence; the immersion-dehydration system includes a closed test box, a pressure gauge, a pressure relief valve and a sealing door, the top of the closed test box is provided with an openable and closable sealing door, the closed test box is provided with a plurality of pressure gauges for measuring the pressure at different positions in the closed test box, and the pressure relief valve is provided at the top of the closed test box; The water circulation system comprises a return water tank, a water injection tank, a water pump and a water guide pipe; a return water tank outlet is arranged at the left bottom of the return water tank, the return water tank outlet is connected to the water inlet of the water pump through the water guide pipe, the water outlet of the water pump is connected to the water inlet of the water injection tank at the upper left part of the water injection tank through the water guide pipe, a water injection tank outlet is arranged at the right bottom of the water injection tank, the water injection tank outlet is connected to the upper left part of the closed experimental box through a first connecting pipe, and a water injection valve is arranged on the first connecting pipe; a return water tank inlet is arranged at the top of the right side of the return water tank, the return water tank inlet is connected to the left bottom of the closed experimental box through a second connecting pipe, and a drain valve is arranged on the second connecting pipe; The pressurization system is connected to the closed experimental box.

2. The experimental device according to claim 1, characterized in that: The pressure gauge comprises a first pressure gauge and a second pressure gauge, wherein a measuring port of the first pressure gauge is connected to the top of the inner cavity of the closed experimental box, and a measuring port of the second pressure gauge is connected to the bottom of the inner cavity of the closed experimental box.

3. The experimental device according to claim 1, characterized in that: The closed experimental box, the return water box and the water injection box are rectangular parallelepiped boxes.

4. The experimental device according to claim 3, characterized in that: A rectangular support frame is arranged on the top surface of the return water tank, and a water injection tank is placed on the upper part of the support frame; the immersion-dehydration system and the boosting system are arranged on the base.

5. The experimental device according to claim 4, characterized in that: The water pump is arranged in the supporting frame.

6. The experimental device according to any one of claims 1, 3-5, characterized in that: A filter is provided at the water outlet of the return water tank.

7. The experimental device according to claim 1, characterized in that: The pressurization system comprises an air booster pump and an air duct, and the air booster pump is connected to the right side of the top of the closed experimental box through the air duct.

8. The experimental device according to claim 7, characterized in that: The air booster pump is provided with a switch for starting and stopping the controller.

9. The experimental device according to claim 8, characterized in that: A pressure valve is arranged at the right side where the air guide tube is connected to the top of the closed experimental box.

10. The experimental device according to claim 1, characterized in that: The water circulation system, immersion-dehydration system and pressurization system are arranged in the experimental cabin.