Device and method for simulating cross-cut coal uncovering

Abstract

According to the rock cross-cut coal uncovering simulation device and method, the environment simulation system is arranged, the sample set is arranged in the environment simulation system, so that the environment of the sample set in the stratum is simulated, the sample set is treated through the gas pretreatment system, and the rock cross-cut coal uncovering simulation device is obtained. The environment simulation system is used for simulating rock cross-cut coal uncovering, the gas pretreatment system is used for simulating rock cross-cut coal uncovering, gas desorption is promoted, gas in a free state is collected, the exploring system acts on the sample set so as to simulate rock cross-cut coal uncovering, and the monitoring system monitors the environment simulation system, the gas pretreatment system and the exploring system so as to obtain experimental data. Therefore, the whole process of rock cross-cut coal uncovering operation in actual production is simulated in a laboratory environment, a verification model is provided for pretreatment means such as ultrasonic waves, effect analysis is performed on an ultrasonic enhanced rock cross-cut coal uncovering scheme, an efficient rock cross-cut coal uncovering scheme is obtained, a basis is provided for on-site rock cross-cut coal uncovering, coal and gas outburst is avoided, and the working efficiency is improved. The cross-cut coal uncovering efficiency is improved, and reference is provided for coal mine safety production.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to a simulated stone gate coal uncovering device and method. Background Art

[0002] In the process of coal mining, coal mining is a complex and dangerous project. Since coal seams usually contain a large amount of gas, the sudden exposure of the coal body during the process of coal mining will cause gas to gush out instantly, which is very likely to cause gas outburst accidents, seriously threatening the lives of coal miners and the normal production of the mine. In order to reduce the risk of gas outbursts and improve the safety and efficiency of coal mining, it is usually necessary to conduct gas extraction before coal mining. However, traditional gas extraction methods have problems such as low extraction efficiency and long extraction time, which are difficult to meet the needs of rapid coal mining. In addition, with the continuous increase in the depth of coal mining, the geological conditions of the coal seams have become more complex, and the gas pressure and content have continued to increase, which has brought greater challenges to coal mining and gas extraction. In the related technology, stone gate coal uncovering requires gradual attempts on site to obtain various relevant parameters of the stone gate coal uncovering plan, which has high safety risks and low efficiency. Therefore, in order to effectively simulate the actual working conditions, provide a verification model for the on-site stone gate coal uncovering plan, and analyze the effect of the provided stone gate coal uncovering plan, it is necessary to provide a simulated stone gate coal uncovering device and simulation method that can be implemented in the laboratory. Summary of the invention

[0003] The present invention provides a device and method for simulating stone gate coal uncovering, and proposes a solution to the problem that stone gate coal uncovering requires gradual attempts on site to obtain various relevant parameters of the stone gate coal uncovering plan, which has high safety risks and low efficiency. The device and method can implement experiments simulating stone gate coal uncovering in a laboratory.

[0004] To achieve the above-mentioned object, in a first aspect, the present invention provides a simulated stone gate coal uncovering device, comprising:

[0005] An environmental simulation system, wherein the environmental simulation system is used to simulate a formation environment;

[0006] A sample group, the sample group is arranged in the environmental simulation system, and includes a rock layer sample and a coal layer sample;

[0007] A gas pretreatment system, the gas pretreatment system is used to act on the sample group, promote gas desorption and collect gas;

[0008] A mining and exploration system, the mining and exploration system is set corresponding to the sample group, and the mining and exploration system is used to simulate the stone gate to uncover coal;

[0009] A monitoring system is used to monitor the gas flow and stress of the environmental simulation system, the flow and pressure of the gas pretreatment system during operation, and the force and gas concentration of the mining and exploration system during operation. In the simulated stone gate coal uncovering device of the present invention, the sample group is arranged inside the environmental simulation system. The environmental simulation system simulates the environment of the sample group in the stratum by introducing gas into the sample group, applying pressure, etc., and makes the coal seam sample absorb enough gas to simulate the gas content in the coal seam in the actual working environment. The gas pretreatment system acts on the sample group to promote gas desorption and extract the gas, simulating the pretreatment before stone gate coal uncovering in actual work. Subsequently, the gas pretreatment system is removed, and the mining and exploration system is installed. The mining and exploration system drills into the sample group along the direction from the rock formation sample to the coal seam sample until part of the coal seam sample is taken out. The monitoring system monitors factors such as the gas flow and stress of the environmental simulation system, the flow and pressure of the gas pretreatment system during operation, and the force and gas concentration of the exploration system during operation. By analyzing the data of the above projects, it can be determined whether the gas pretreatment system can fully play its role, the possibility of gas outburst, etc., to provide a reliable basis for actual engineering mining, provide a large amount of data support for optimizing on-site mining processes, and provide a scientific reference for safe production in coal mines.

[0010] As an optional technical solution, the environmental simulation system includes an environmental simulation box, a gas injection mechanism and a pressure simulation mechanism, the sample group and the pressure simulation mechanism are arranged in the environmental simulation box, the pressure simulation mechanism is arranged corresponding to the sample group, the gas injection mechanism is connected to the environmental simulation box, and the gas injection mechanism is used to inject gas into the coal seam sample in the environmental simulation box;

[0011] The environmental simulation box is provided with a reserved hole, and the reserved hole is arranged corresponding to the sample group. The gas pretreatment system and the exploration system are connected to the sample group through the reserved hole. The sample group can be directly prefabricated in the environmental simulation box. By replacing the environmental simulation box containing the sample group with different characteristics, the sample group with different characteristics can be conveniently tested, which is conducive to improving the experimental efficiency.

[0012] As an optional technical solution, the environmental simulation box includes an inner box, an outer box and a closing plate, the outer box is sleeved outside the inner box, the reserved hole runs from the outer box to the inner box, the closing plate is arranged inside the outer box or the inner box and covers the reserved hole, and the sample group is arranged inside the inner box. The setting of the reserved hole can serve as an indicator for the installation of the gas pretreatment system and the exploration system, and the components of the monitoring system can be arranged near the reserved hole in advance so that the monitoring system can obtain timely and accurate data. However, when the gas injection mechanism injects gas into the coal seam sample, the gas is easy to leak from the reserved hole, which not only reduces the efficiency of gas injection but also threatens the safety of the experimenters. The use of the closing plate can close the reserved hole during the process of the gas injection mechanism injecting gas into the coal seam sample. After the gas injection is completed, the closing plate is destroyed to install the gas pretreatment system and the exploration system, thereby reducing the risk of gas leakage and protecting the safety of the experimenters.

[0013] As an optional technical solution, the inner box is made of a flexible material, and the pressure simulation mechanism includes a first water bag and a second water bag. The first water bag is arranged between the inner box and the outer box and is arranged opposite to the reserved hole. The second water bag is arranged between the inner box and the outer box. The second water bag is arranged adjacent to the first water bag and is located on a different side of the inner box from the first water bag. After the first water bag and the second water bag are installed in the above position, the outer box is closed. The first water bag and the second water bag can form pressure on the surface of the inner box due to the squeezing effect of the inner wall of the outer box. Since the inner box is made of a flexible material, the pressure will be transmitted to the sample group. The pressure on the sample group can be controlled by adjusting the volume of the first water bag and the second water bag filled with water.

[0014] As an optional technical solution, the monitoring system includes a first flow meter and a stress sensor, and the first flow meter is arranged on the gas injection mechanism;

[0015] The stress sensor is disposed on the surface of the sample group and is disposed corresponding to the first water bag and the second water bag. The stress sensor can obtain the pressure data of the first water bag and the second water bag on the sample group, which is convenient for the experimenter to accurately control the experiment.

[0016] As an optional technical solution, the gas pretreatment system includes a hydraulic slitting mechanism, an ultrasonic generating mechanism and a gas extraction mechanism. The hydraulic slitting mechanism is used to penetrate from the outside of the environmental simulation system to the inside of the sample group; the ultrasonic generating mechanism is installed on the coal seam sample; and the gas extraction mechanism is used to insert from the outside of the environmental simulation system into the coal seam sample. Promoting the adsorption of gas by coal seams through hydraulic slitting and ultrasound is a common method in stone gate coal uncovering operations. Using the hydraulic slitting mechanism and the ultrasonic generating mechanism to pretreat the sample group can restore the process of stone gate coal uncovering in actual production, which helps to improve the matching degree between the experimental results and actual production, thereby enhancing the guiding role of the experiment.

[0017] As an optional technical solution, the monitoring system includes a first pressure gauge, a second pressure gauge, a second flow meter and a third flow meter, wherein the first pressure gauge and the second flow meter are arranged on the hydraulic slitting mechanism, and the second pressure gauge and the third flow meter are arranged on the gas extraction mechanism. This technical solution can realize quantitative monitoring of the hydraulic slitting mechanism and the gas extraction mechanism, so as to facilitate the experimenter to control the hydraulic slitting mechanism and the gas extraction mechanism.

[0018] As an optional technical solution, the exploration system includes an electric drill, a bracket and a track, the track is arranged parallel to the axis of the reserved hole, the bracket is slidably connected to the track, the electric drill is arranged corresponding to the reserved hole, and the electric drill is connected to the bracket;

[0019] Along the axis direction of the reserved hole, the rock sample is closer to the outer box than the coal sample. When the mining and exploration system is working, manpower or other driving devices are used to push the bracket at a constant speed along the track, so that the electric drill passes through the reserved hole and penetrates from the rock sample to the coal sample, thereby simulating the stone gate coal uncovering process.

[0020] As an optional technical solution, the monitoring system includes a dynamometer and a gas sensor, wherein the dynamometer is arranged at the connection between the electric drill and the bracket, and the gas sensor is arranged corresponding to the reserved hole. The dynamometer can reflect the force exerted by the sample group on the electric drill, thereby judging the discharge of gas from the sample group, and the gas sensor can intuitively reflect whether there is a risk of gas outburst during the simulated stone gate coal uncovering process.

[0021] In a second aspect, the present invention provides a method for simulating stone gate coal uncovering, which is implemented based on the simulating stone gate coal uncovering device described in any one of the above technical solutions, and the method comprises:

[0022] making and installing the sample set;

[0023] Starting the environmental simulation system to simulate the formation environment, injecting gas into the coal seam sample, and starting the monitoring system;

[0024] Installing and starting the gas pretreatment system, desorbing and collecting gas, and pretreating the sample group;

[0025] Dismantle the gas pretreatment system, install and start the mining and exploration system, and excavate and explore the sample group;

[0026] Collect data fed back by the monitoring system.

[0027] One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

[0028] 1. The simulated stone gate coal uncovering device of the present invention, by setting up an environmental simulation system, setting up a sample group in the environmental simulation system, thereby simulating the environment of the sample group in the formation, using a gas pretreatment system to treat the sample group, promoting gas desorption and collecting gas in a free state, and then using a mining and exploration system to act on the sample group to simulate stone gate coal uncovering, and a monitoring system monitors the environmental simulation system, the gas pretreatment system and the mining and exploration system to obtain experimental data, thereby simulating the entire process of stone gate coal uncovering operations in actual production in a laboratory environment, providing a verification model for pretreatment methods such as ultrasound, and analyzing the effects of ultrasonic enhanced stone gate coal uncovering schemes to obtain efficient stone gate coal uncovering schemes, thereby providing a basis for on-site stone gate coal uncovering, avoiding coal and gas outbursts, improving stone gate coal uncovering efficiency, and providing a reference for safe production in coal mines.

[0029] 2. The simulated stone gate coal uncovering device of the present invention can quickly replace or simultaneously set up multiple environmental simulation systems. Sample groups with different characteristics can be set up in the multiple environmental simulation systems, and the gas pretreatment system and the exploration system can perform differentiated processing on the above-mentioned multiple sample groups respectively, and obtain multiple groups of experimental data at one time, which is conducive to improving experimental efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of the present invention, and do not constitute a limitation on the embodiments of the present invention;

[0031] Figure 1 Schematic diagram of the environmental simulation system, sample group, and monitoring system in the simulated stone gate coal uncovering device of the present invention

[0032] Figure 2 It is a schematic diagram of the environment simulation system, sample group, monitoring system and hydraulic cutting mechanism in the simulated stone gate coal uncovering device of the present invention;

[0033] Figure 3It is a schematic diagram of the environment simulation system, sample group, monitoring system and gas extraction mechanism in the simulated stone gate coal uncovering device of the present invention;

[0034] Figure 4 It is a schematic diagram of the environment simulation system, sample group, monitoring system and mining and exploration system in the simulated stone gate coal uncovering device of the present invention;

[0035] Figure 5 It is a cross-sectional schematic diagram of the environmental simulation box in the present invention along the radial direction of the reserved hole;

[0036] Figure 6 It is a cross-sectional schematic diagram of the environmental simulation box in the present invention along the axial direction of the reserved hole;

[0037] Figure 7 The present invention is a flow chart of the method for simulating coal mining through stone gate.

[0038] Description of Reference Numerals

[0039] Environmental simulation box-11; reserved hole-111; inner box-112; outer box-113; closing plate-114; gas injection mechanism-12; gas tank-121; gas injection pump-122; gas injection pipeline-123; gas injection nozzle-124; pressure simulation mechanism-13; first water bag-131; second water bag-132;

[0040] Sample group-2; rock sample-21; coal seam sample-22;

[0041] Gas pretreatment system-3; hydraulic slotting mechanism-31; water tank-311; water pump-312; water pipeline-313; high-pressure slotting pipeline-314; slotting nozzle-315; ultrasonic generating mechanism-32; ultrasonic transducer-321; gas extraction mechanism-33;

[0042] Mining and exploration system-4; electric drill-41; support-42; track-43;

[0043] The first flow meter-51; the stress sensor-52; the first pressure gauge-53; the second pressure gauge-54; the second flow meter-55; the third flow meter-56; the force gauge-57; and the gas sensor-58. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0046] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection, it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0049] Embodiment 1

[0050] The present invention provides a device for simulating coal mining from stone gates, comprising an environmental simulation system, a sample group 2, a gas pretreatment system 3, a mining and exploration system 4 and a monitoring system. The environmental simulation system is used to simulate the formation environment. The sample group 2 is arranged in the environmental simulation system, and comprises a rock layer sample 21 and a coal layer sample 22. The gas pretreatment system 3 is used to act on the sample group 2, promote gas desorption and collect gas. The mining and exploration system 4 is arranged corresponding to the sample group 2, and the mining and exploration system 4 is used to simulate coal mining from stone gates. The monitoring system is used to monitor the gas flow and stress of the environmental simulation system, the flow and pressure of the gas pretreatment system 3 during operation, and the force and gas concentration of the mining and exploration system 4 during operation.

[0051] In the simulated stone gate coal uncovering device of this embodiment, the sample group 2 is arranged inside the environmental simulation system. The environmental simulation system simulates the environment of the sample group 2 in the stratum by means of introducing gas into the sample group 2, applying pressure, etc., and makes the coal seam sample 22 absorb enough gas, simulating the gas content in the coal seam of the actual working environment. The gas pretreatment system 3 acts on the sample group 2 to promote gas desorption and extract the gas, simulating the pretreatment before the stone gate coal uncovering in actual work. Then the gas pretreatment system 3 is removed, and the exploration system 4 is installed. The exploration system 4 drills into the sample group 2 along the direction from the rock layer sample 21 to the coal seam sample 22 until part of the coal seam sample 22 is taken out. The monitoring system monitors the gas flow and stress of the environmental simulation system, the flow and pressure of the gas pretreatment system 3 during the working process, and the force and gas concentration of the exploration system 4 during the working process. By analyzing the data of the above items, it can be judged whether the gas pretreatment system 3 can fully play its role, the possibility of gas outburst, etc.

[0052] There may be multiple environmental simulation systems, and sample groups 2 with different characteristics may be provided in the multiple environmental simulation systems. The gas pretreatment system 3 and the exploration system 4 perform differentiated processing on the multiple sample groups 2, respectively, so as to obtain multiple groups of experimental data at one time and improve the experimental efficiency.

[0053] Among them, the environmental simulation system introduces gas to the sample group 2, the gas pretreatment system 3 pretreats the sample group 2, and the exploration system 4 simulates the stone gate coal mining of the sample group 2. These can be carried out in different locations, thereby reducing the requirements for the laboratory environment and facilitating the implementation of the experiment.

[0054] Embodiment 2

[0055] On the basis of the first embodiment, the environmental simulation system includes an environmental simulation box 11, a gas injection mechanism 12 and a pressure simulation mechanism 13. The sample group 2 and the pressure simulation mechanism 13 are arranged in the environmental simulation box 11. The pressure simulation mechanism 13 is arranged corresponding to the sample group 2. The gas injection mechanism 12 is connected to the environmental simulation box 11. The gas injection mechanism 12 is used to inject gas into the coal seam sample 22 in the environmental simulation box 11. The environmental simulation box 11 is provided with a reserved hole 111, which is arranged corresponding to the sample group 2. The gas pretreatment system 3 and the exploration system 4 are connected to the sample group 2 through the reserved hole 111. The sample group 2 can be directly prefabricated in the environmental simulation box 11. By replacing the environmental simulation box 11 containing the sample group 2 with different characteristics, the sample group 2 with different characteristics can be conveniently tested, which is conducive to improving the experimental efficiency.

[0056] The gas injection mechanism 12 includes a gas tank 121, an air injection pump 122, an air injection pipeline 123 and an air injection nozzle 124. The air injection nozzle 124 runs from the outside to the inside of the environmental simulation box 11. The air injection pipeline 123 connects the gas tank 121, the air injection pump 122 and the air injection nozzle 124. The air injection pipeline 123 may have a flow meter, a pressure gauge and a valve for the convenience of observation by the experimenter. When the gas injection mechanism 12 is used, the environmental simulation box 11 is closed, a certain amount of gas is injected into the environmental simulation box 11 through the air injection nozzle 124 and then closed. The environmental simulation box 11 is left stationary for 2-3 days to allow the coal seam sample 22 to fully absorb the gas, thereby simulating the state in which the coal absorbs gas in the formation. It should be noted that while the environmental simulation box 11 is stationary, the gas injection mechanism 12 can maintain connection with the environmental simulation box 11, or a separate valve can be set on the gas injection nozzle 124. After the gas injection is completed, the valve on the gas injection nozzle 124 can be closed to disconnect the connection between the environmental simulation box 11 and the gas injection mechanism 12. After the gas injection is completed, the environmental simulation box 11 can be placed in a centralized and stationary environment.

[0057] As an optional embodiment, the environmental simulation box 11 includes an inner box 112, an outer box 113 and a closing plate 114. The outer box 113 is sleeved outside the inner box 112. The reserved hole 111 runs from the outer box 113 to the inner box 112. The closing plate 114 is arranged inside the outer box 113 or the inner box 112 and covers the reserved hole 111. The sample group 2 is arranged inside the inner box 112. The setting of the reserved hole 111 can serve as an indicator for the installation of the gas pretreatment system 3 and the exploration system 4, and the components of the monitoring system can be arranged near the reserved hole 111 in advance so that the monitoring system can obtain timely and accurate data. However, when the gas injection mechanism 12 injects gas into the coal seam sample 22, the gas is easy to leak from the reserved hole 111, which not only reduces the efficiency of gas injection but also threatens the safety of the experimenters. The use of the closing plate 114 can close the reserved hole 111 during the process of the gas injection mechanism 12 injecting gas into the coal seam sample 22. After the gas injection is completed, the closing plate 114 is destroyed to install the gas pretreatment system 3 and the mining and exploration system 4, thereby reducing the risk of gas leakage and protecting the safety of the experimenters. It should be noted that the material of the closing plate 114 should be a flexible material, such as rubber, silicone, etc., to enhance the sealing effect of the closing plate 114 on the reserved hole 111.

[0058] As an optional embodiment, the inner box 112 is made of flexible material, and the pressure simulation mechanism 13 includes a first water bag 131 and a second water bag 132. The first water bag 131 is arranged between the inner box 112 and the outer box 113, and is arranged opposite to the reserved hole 111. The second water bag 132 is arranged between the inner box 112 and the outer box 113. The second water bag 132 is arranged adjacent to the first water bag 131 and is located on a different side of the inner box 112 from the first water bag 131. After the first water bag 131 and the second water bag 132 are installed at the above position, the outer box 113 is closed. The first water bag 131 and the second water bag 132 can form pressure on the surface of the inner box 112 due to the squeezing effect of the inner wall of the outer box 113. Since the inner box 112 is made of a flexible material, the pressure will be transmitted to the sample group 2. The pressure on the sample group 2 can be controlled by adjusting the volume of the first water bag 131 and the second water bag 132 filled with water. On the other hand, the inner box 112 is made of a flexible material, which also makes it convenient for the circuits of the internal components of the inner box 112 to be led out from the seam or corner between the cover and the opening of the inner box 112, wherein the components inside the inner box 112 can be components of the stress sensor 52 and the ultrasonic generating mechanism 32 mentioned below.

[0059] As an optional embodiment, the monitoring system includes a first flow meter 51 and a stress sensor 52. The first flow meter 51 is arranged on the gas injection mechanism 12. The stress sensor 52 is arranged on the surface of the sample group 2 and corresponds to the first water bag 131 and the second water bag 132. The stress sensor 52 can obtain the pressure data of the first water bag 131 and the second water bag 132 on the sample group 2, which is convenient for the experimenter to accurately control the experiment.

[0060] As an optional embodiment, the gas pretreatment system 3 includes a hydraulic slitting mechanism 31, an ultrasonic generating mechanism 32 and a gas extraction mechanism 33. The hydraulic slitting mechanism 31 is used to penetrate from the outside of the environmental simulation system to the inside of the sample group 2; the ultrasonic generating mechanism 32 is installed on the coal seam sample 22; and the gas extraction mechanism 33 is used to be inserted from the outside of the environmental simulation system to the coal seam sample 22. Promoting the adsorption of gas by coal seams through hydraulic slitting and ultrasonic waves is a common method in stone gate coal uncovering operations. Pretreatment of the sample group 2 using the hydraulic slitting mechanism 31 and the ultrasonic generating mechanism 32 can restore the process of stone gate coal uncovering in actual production, which helps to improve the matching degree between the experimental results and the actual production, thereby enhancing the guiding role of the experiment.

[0061] The ultrasonic generating mechanism 32 includes an ultrasonic transducer 321, which is installed inside the coal seam sample 22. The ultrasonic transducer 321 is used to generate ultrasonic waves, thereby promoting the desorption of gas in the coal seam sample 22. The hydraulic slotting mechanism 31 includes a water tank 311, a water pump 312, a water pipeline 313, a high-pressure slotting pipeline 314 and a slotting nozzle 315, which are connected in sequence. The high-pressure slotting pipeline 314 extends from the reserved hole 111 into the environment simulation box 11, and the slotting nozzle 315 is connected to the end of the high-pressure slotting pipeline 314 and extends into the coal seam sample 22. The first pressure gauge 53 and the second flow meter 55 described below can be set in the water pipeline 313.

[0062] As an optional embodiment, the monitoring system includes a first pressure gauge 53, a second pressure gauge 54, a second flow meter 55 and a third flow meter 56. The first pressure gauge 53 and the second flow meter 55 are arranged on the hydraulic slotting mechanism 31, and the second pressure gauge 54 and the third flow meter 56 are arranged on the gas extraction mechanism 33. This embodiment can realize quantitative monitoring of the hydraulic slotting mechanism 31 and the gas extraction mechanism 33, which is convenient for the experimenter to adjust the hydraulic slotting mechanism 31 and the gas extraction mechanism 33.

[0063] As an optional embodiment, the exploration system 4 includes an electric drill 41, a bracket 42 and a track 43. The track 43 is arranged parallel to the axis of the reserved hole 111, the bracket 42 is slidably connected to the track 43, the electric drill 41 is arranged corresponding to the reserved hole 111, and the electric drill 41 is connected to the bracket 42. Along the axis direction of the reserved hole 111, the rock layer sample 21 is closer to the outer box 113 than the coal layer sample 22. When the exploration system 4 is working, the bracket 42 is pushed at a uniform speed along the track 43 by manpower or other driving devices, so that the electric drill 41 passes through the reserved hole 111, and penetrates from the rock layer sample 21 to the coal layer sample 22, thereby simulating the stone gate coal uncovering process.

[0064] As an optional implementation, the monitoring system includes a dynamometer 57 and a gas sensor 58. The dynamometer 57 is arranged at the connection between the electric drill 41 and the bracket 42, and the gas sensor 58 is arranged corresponding to the reserved hole 111. The dynamometer 57 can reflect the force of the sample group 2 on the electric drill 41, so as to judge the discharge of gas from the sample group 2, and the gas sensor 58 can intuitively reflect whether there is a risk of gas outburst during the simulated stone gate coal uncovering process.

[0065] Embodiment 3

[0066] The present invention provides a method for simulating stone gate coal uncovering, which is implemented based on the simulating stone gate coal uncovering device in the above embodiment, and the method includes:

[0067] S10: Prepare and install sample group 2;

[0068] S20: Start the environmental simulation system to simulate the formation environment, inject gas into the coal seam sample 22, and start the monitoring system;

[0069] S30: installing and starting the gas pretreatment system 3, desorbing and collecting gas, and pretreating the sample group 2;

[0070] S40: dismantle the gas pretreatment system 3, install and start the mining and exploration system 4, and excavate and explore the sample group 2;

[0071] S50: Collect data fed back by the monitoring system.

[0072] Specifically, S10 includes:

[0073] S11: prepare the coal seam sample 22 and the rock seam sample 21 respectively, and splice the rock seam sample 21 to the outside of the coal seam sample 22;

[0074] S12: drilling a hole on the coal seam sample 22 and installing an ultrasonic transducer 321;

[0075] S13: Install the sample set 2 in the inner box 112, so that the rock sample 21 is closer to the reserved hole 111 than the coal sample 22, and install the closing plate 114;

[0076] S14: Install the stress sensor 52 on the surface of the sample group 2, and lead the lines of the stress sensor 52, ultrasonic transducer 321, etc. out from the joint between the cover and the opening of the inner box 112.

[0077] Specifically, S20: starting the environmental simulation system to simulate the formation environment and injecting gas into the coal seam sample 22, and starting the monitoring system includes:

[0078] S21: The first water bag 131 and the second water bag 132 are filled with water and installed between the inner box 112 and the outer box 113, the outer box 113 is closed, the stress sensor 52 is started, and the reading of the stress sensor 52 is observed;

[0079] S22: The gas injection mechanism 12 is connected to the inner box 112, and the gas injection pump 122 is turned on to introduce a certain amount of gas into the coal seam sample 22 in the inner box 112, and then the gas injection pump 122 is turned off, and the environmental simulation box 11 is left to stand for 2-3 days;

[0080] S23: Weigh the environmental simulation box 11 (including the sample group 2 therein) and turn on the gas sensor 58.

[0081] Specifically, S30 includes:

[0082] S31: Punch through the closing plate 114 along the reserved hole 111, and install the hydraulic cutting mechanism 31 through the reserved hole 111;

[0083] S32: starting the hydraulic cutting mechanism 31 and the ultrasonic generating mechanism 32 to promote gas desorption in the coal seam sample 22;

[0084] S33: quickly dismantle the hydraulic cutting mechanism 31 and install the gas extraction mechanism 33 in the reserved hole 111, extract the gas in the environmental simulation box 11, and observe and record the total amount of extracted gas.

[0085] S34: Weigh the weight of the debris of the sample group 2 generated by the hydraulic cutting mechanism 31 and the like.

[0086] Specifically, S40 includes:

[0087] S41: Remove the hydraulic cutting mechanism 31, install the mining and exploration system 4, and align the drill bit of the electric drill 41 with the reserved hole 111 and the distance from the reserved hole 111 is about 15 mm;

[0088] S42: Turn on the electric drill 41 and push the support 42 slowly and evenly until the electric drill 41 penetrates the coal seam sample 22. During this process, observe the readings of the dynamometer 57 and the gas sensor 58;

[0089] S43: Pull out the electric drill 41, collect the debris of the sample set 2, and weigh the remaining weight of the environmental simulation box 11 (including the sample set 2 therein).

[0090] It should be noted that the length of the drill bit of the electric drill 41 can be configured to just penetrate the coal seam sample 22, so as to facilitate the control of variables in multiple experiments.

[0091] It should be noted that a control group experiment can be set up, in which the hydraulic cutting mechanism 31 and the ultrasonic generating mechanism 32 are not operated, so as to obtain relevant conditions of simulated stone gate coal uncovering without gas desorption.

[0092] In addition, the relevant parameters of the hydraulic cutting mechanism 31 and the ultrasonic generating mechanism 32 can be adjusted, and the following experiments are performed:

[0093] In multiple experiments, the experimental groups with lower readings on the gas monitor indicate that the gas is discharged more completely, there is less residual gas in the coal seam sample 22, the possibility of gas outburst is smaller, and the stone gate coal can be uncovered more safely.

[0094] In many experiments, the weight of the debris from sample group 2 mined by the exploration system 4 was compared. The smaller weight of the debris from sample group 2 indicated that the gas was discharged more completely, and the total amount of residual gas in the coal seam sample 22 was less, making the unit weight of the debris lighter, the possibility of gas outburst smaller, and the stone gate coal mining could be carried out more safely.

[0095] In many tests, the gas extraction system performed gas extraction with higher efficiency, indicating that the hydraulic cutting mechanism 31 and the ultrasonic generating mechanism 32 desorbed the gas in the coal seam sample 22 more completely, which is beneficial to reduce the gas remaining in the simulated coal seam and improve the efficiency of stone gate coal uncovering.

[0096] In multiple tests, the groups with smaller readings on the dynamometer 57 and smaller numerical fluctuation amplitudes and frequencies indicate that the residual gas in sample group 2 is less likely to produce recoil force on the drill bit of the electric drill 41, the gas is discharged more completely, there is less residual gas in the coal seam sample 22, the possibility of gas outburst is smaller, and coal can be uncovered more safely.

[0097] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0098] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A simulated stone gate coal uncovering device, characterized in that: include: An environmental simulation system, wherein the environmental simulation system is used to simulate a formation environment; A sample group, wherein the samples are arranged in the environmental simulation system and include rock samples and coal seam samples; A gas pretreatment system, the gas pretreatment system is used to act on the sample group, promote gas desorption and collect gas; A mining and exploration system, the mining and exploration system is set corresponding to the sample group, and the mining and exploration system is used to simulate the stone gate to uncover coal; A monitoring system is used to monitor the gas flow and stress of the environmental simulation system, the flow and pressure of the gas pretreatment system during operation, and the force and gas concentration of the exploration system during operation.

2. The simulated stone gate coal uncovering device according to claim 1, characterized in that: The environmental simulation system includes an environmental simulation box, a gas injection mechanism and a pressure simulation mechanism. The sample group and the pressure simulation mechanism are arranged in the environmental simulation box. The pressure simulation mechanism is arranged corresponding to the sample. The gas injection mechanism is connected to the environmental simulation box. The gas injection mechanism is used to inject gas into the coal seam sample in the environmental simulation box. The environmental simulation box is provided with a reserved hole, and the reserved hole is arranged corresponding to the sample group. The gas pretreatment system and the mining and exploration system are connected to the sample group through the reserved hole.

3. The simulated stone gate coal uncovering device according to claim 2, characterized in that: The environmental simulation box includes an inner box, an outer box and a closing plate. The outer box is sleeved outside the inner box. The reserved hole runs through the outer box to the inner box. The closing plate is arranged inside the outer box or the inner box and covers the reserved hole. The sample is arranged inside the inner box.

4. The simulated stone gate coal uncovering device according to claim 3, characterized in that: The inner box is made of flexible material, and the pressure simulation mechanism includes a first water bag and a second water bag. The first water bag is arranged between the inner box and the outer box and is arranged opposite to the reserved hole. The second water bag is arranged between the inner box and the outer box. The second water bag is arranged adjacent to the first water bag and is located on a different side of the inner box from the first water bag.

5. The simulated stone gate coal uncovering device according to claim 4, characterized in that: The monitoring system includes a first flow meter and a stress sensor, wherein the first flow meter is arranged on the gas injection mechanism; The stress sensor is disposed on the surface of the sample group and is disposed corresponding to the first water bag and the second water bag.

6. The simulated stone gate coal uncovering device according to claim 1, characterized in that: The gas pretreatment system includes a hydraulic cutting mechanism, an ultrasonic generating mechanism and a gas extraction mechanism. The hydraulic cutting mechanism is used to penetrate from the outside of the environmental simulation system to the inside of the sample group; the ultrasonic generating mechanism is installed on the coal seam sample; and the gas extraction mechanism is inserted from the outside of the environmental simulation system into the coal seam sample.

7. The simulated stone gate coal uncovering device according to claim 6, characterized in that: The monitoring system includes a first pressure gauge, a second pressure gauge, a second flow meter and a third flow meter. The first pressure gauge and the second flow meter are arranged on the hydraulic cutting mechanism, and the second pressure gauge and the third flow meter are arranged on the gas extraction mechanism.

8. The simulated stone gate coal uncovering device according to claim 2, characterized in that: The exploration system includes an electric drill, a bracket and a track, wherein the track is arranged parallel to the axis of the reserved hole, the bracket is slidably connected to the track, the electric drill is arranged corresponding to the reserved hole, and the electric drill is connected to the bracket; Along the axial direction of the reserved hole, the rock layer sample is closer to the outer box than the coal layer sample.

9. The simulated stone gate coal uncovering device according to claim 8, characterized in that: The monitoring system includes a dynamometer and a gas sensor. The dynamometer is arranged at the connection between the electric drill and the bracket, and the gas sensor is arranged corresponding to the reserved hole.

10. A method for simulating coal mining through stone gate, characterized in that: Based on the simulated stone gate coal uncovering device described in any one of claims 1 to 9, the method comprises: making and installing the sample set; Starting the environmental simulation system to simulate the formation environment, injecting gas into the coal seam sample, and starting the monitoring system; Installing and starting the gas pretreatment system, desorbing and collecting gas, and pretreating the sample; Dismantle the gas pretreatment system, install and start the mining and exploration system, and excavate and explore the sample; Collect data fed back by the monitoring system.

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