Coal seam mining experimental simulation device and simulation method under the influence of fault evolution

Abstract

The present invention provides an experimental simulation device and simulation method for coal seam mining under the influence of fault evolution, which relates to the technical field of geological fault demonstration equipment. The experimental simulation device for coal seam mining under the influence of fault evolution includes an experimental cavity, two groups of pressurizing components, multiple groups of sensors, and a control component. The experimental cavity is used for laying experimental samples; the two groups of pressurizing components are arranged on opposite sides of the experimental cavity, and the two groups of pressurizing components are used to pressurize the experimental cavity; multiple groups of sensors are placed at intervals in the experimental samples; the control component is electrically connected to the two groups of pressurizing components and multiple groups of sensors respectively. The differences between the experimental simulation device and simulation method for coal seam mining under the influence of fault evolution at the theoretical research level and the on-site construction level are relatively small, and the results obtained thereby are more easily applicable on site.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental simulation equipment for coal seam mining under the influence of fault evolution, and particularly to an experimental simulation device and simulation method for coal seam mining under the influence of fault evolution. Background Art

[0002] Most of the existing related research on the influence of faults, especially the simulation of coal seam mining experiments, relies on preset faults. The preset fault is a method of simulating faults by filling with materials of lower strength based on the location of the fault. There is a lack of true restoration and simulation of the fault evolution and growth process, making it difficult to reflect the mechanical parameters and variation effects of various fault areas. At the same time, it is impossible to simulate and analyze the dynamic changes and influence laws of faults during the coal seam excavation process, resulting in a large on-site difference in the design of mining plans and related research.

[0003] Currently, there are also some other relatively technically improved simulation means. For example, some researchers have proposed a monitoring device and method for fault tectonic stress, and calculated the steady-state critical value with the help of a function model, which has good practical significance in the field. However, all its research devices and data are based on prefabricated fault planes, with certain application limitations. Some researchers have also proposed a device and method for simulating faults by superimposing displacements on a double platform, using displacement and torsional deformation to restore faults. However, the geometric restoration method of displacement and torsional deformation cannot restore the true stress environment and growth evolution law inside the fault. In addition, there is also an experimental device and method for physically simulating normal faults by using a telescopic baffle in cooperation with spherical flanges and spherical socket grooves, which avoids the influence caused by sequential production and improves the similarity between the fault and the coal seam occurrence to a certain extent. However, this construction method has obvious result characteristics, only restores the fault development result, ignores the influence of tectonic movement on the fault evolution process, so it cannot truly present the stress and other environments inside the fault, and at the same time, it cannot simulate and analyze small faults and pores. The existing simulation schemes have limitations and can only restore the fault development result based on the preset fault, and cannot restore the stress environment inside the fault and its dynamic evolution law. The occurrence state and stress environment of the fault have an important influence on the simulation analysis of the coal seam mining process. Therefore, the existing simulation schemes cannot truly simulate the coal seam mining experiment under the influence of faults, let alone conduct scientific research in related fields.

[0004] It can be seen that after a certain amount of scientific research innovation, the existing preset faults still have certain technical defects at the theoretical research and on-site construction levels, resulting in the scientific research results of coal seam mining experiment simulation being based on the properties of the preset fault plane laid with low-strength materials, unable to truly simulate and restore the fault evolution and development process or result, and even less able to achieve breakthroughs in related research under the influence of faults. The results obtained are difficult to judge whether they are applicable. Summary of the Invention

[0005] In view of the problems in the above-mentioned prior art, the present application proposes an experimental simulation device and simulation method for coal seam mining under the influence of fault evolution, so as to simulate and restore a fault that evolves to be real in occurrence state and mechanical environment with the real fault to be studied, thereby realizing the simulation and restoration of the evolution and growth process of the fault, and at the same time providing a model guarantee for the coal seam excavation plan and related research.

[0006] On the one hand, the present invention provides an experimental simulation device for coal seam mining under the influence of fault evolution. The experimental simulation device for coal seam mining under the influence of fault evolution includes:

[0007] An experimental cavity for laying experimental samples, and the experimental cavity provides a laying space for the experimental samples.

[0008] Two groups of pressurizing components are arranged on opposite sides of the experimental cavity. The two groups of pressurizing components are used to locally or globally pressurize the experimental cavity. The pressurizing components perform global pressurization on the experimental cavity to cause displacement and fracture of the experimental samples in the experimental cavity, and cooperate with local pressurization to achieve local adjustment and the reduction simulation of small faults and small pores, so as to finally form the geological fault to be simulated.

[0009] Multiple groups of sensors are placed at intervals in the experimental samples. The multiple groups of sensors respectively detect the displacement and stress information at different positions of the experimental samples. During the geological fault simulation stage, the multiple groups of sensors respectively send the detected displacement and stress information at different positions of the experimental samples to the control component, so that the control component controls the two groups of pressurizing components to pressurize the experimental cavity, and finally makes the displacement and stress information detected by the multiple groups of sensors at different positions of the experimental samples consistent with the displacement and stress information of the fault to be simulated, thereby completing the simulation of the fault to be simulated; during the coal seam excavation stage, the multiple groups of sensors respectively detect the displacement and stress information at different positions of the experimental samples, and send the detected displacement and stress information at different positions of the experimental samples to the control component to complete the information monitoring during the coal seam excavation process of the experimental samples, so as to evaluate the coal seam excavation plan.

[0010] A control component, which is electrically connected to the two groups of pressurizing components and multiple groups of sensors respectively. In the geological fault simulation stage, the control component controls the two groups of pressurizing components to pressurize the experimental cavity according to the detection information of the multiple groups of sensors, and finally makes the displacement and stress information of different positions of the experimental sample detected by the multiple groups of sensors consistent with the displacement and stress information of the fault to be simulated, so as to complete the simulation of the fault to be simulated; in the coal seam excavation stage, the control component evaluates the coal seam excavation plan according to the displacement and stress information of different positions of the experimental sample detected by the multiple groups of sensors.

[0011] Specifically, the experimental cavity includes a front side plate, a rear side plate, a left side plate, a right side plate and a lower bottom plate that enclose the experimental cavity, and the front side plate is detachably connected to the left side plate and the right side plate respectively, and the rear side plate is detachably connected to the left side plate and the right side plate respectively. One group of the pressurizing components is located outside the left side plate, and the other group of the pressurizing components is located outside the right side plate.

[0012] The pressurizing component includes a pressurizing bracket and a plurality of pressurizing members spacedly installed on the pressurizing bracket. The plurality of pressurizing members are used to pressurize the opposite side plates of the experimental cavity. The pressurizing component further includes a bearing baffle, and the pressurizing member acts on the left side plate or the right side plate through the bearing baffle.

[0013] Each group of sensors includes a stress sensor, a horizontal displacement sensor and a vertical displacement sensor. The stress sensor is used to detect the stress of the experimental sample, the horizontal displacement sensor is used to detect the horizontal displacement of the experimental sample, and the vertical displacement sensor is used to detect the vertical displacement of the experimental sample. The sensors are arranged at intervals in both the horizontal and vertical directions of the experimental sample.

[0014] The experimental simulation device for coal seam mining under the influence of fault evolution further includes an experimental platform. The experimental cavity is placed on the experimental platform. The experimental platform includes a platform plate and a plurality of support legs. The plurality of support legs are spacedly arranged at the bottom of the platform plate. The experimental simulation device for coal seam mining under the influence of fault evolution further includes a filling bucket, and the filling bucket is hung on the experimental platform. The filling bucket is used to fill the experimental sample.

[0015] On the other hand, the present invention provides a simulation method for the above-mentioned experimental simulation device for coal seam mining under the influence of fault evolution, including the steps of:

[0016] Lay the experimental sample in the experimental cavity and synchronously place multiple groups of sensors;

[0017] Based on the detection information of multiple groups of the sensors, control two groups of pressurizing components to pressurize the experimental cavity until the feedback images and information data of multiple groups of the sensors fit the images and mechanical data information of the real fault to be simulated.

[0018] Excavate the experimental sample in combination with the designed mining plan. Meanwhile, multiple groups of the sensors will dynamically detect the information of coal seams, faults and surrounding rocks and send it to the control component for analysis of mining laws.

[0019] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the present invention can be achieved.

[0020] A coal seam mining experiment simulation device and simulation method based on the influence of fault evolution provided by the present invention, compared with the prior art, at least have the following beneficial effects: For the coal seam mining experiment simulation device and simulation method based on the influence of fault evolution provided by the present invention, the control component controls two groups of pressurizing components to pressurize the experimental cavity according to the detection information of multiple groups of sensors until the detection information of multiple groups of sensors fits the data information of the real fault to be simulated, so as to simulate and evolve the geological fault to be studied. The coal seam mining experiment simulation device and simulation method based on the influence of the fault evolved by simulation can reproduce the whole process of the evolution of the geological fault under tectonic movement, and finally form a simulated fault that fits the real fault to be studied. Based on this simulated fault, theoretical research and mining excavation monitoring are carried out. Use a small pneumatic rock drill, drill pipe, and shovel to excavate simultaneously in combination with the designed coal seam mining plan. Each group of sensors monitors the data information of the fault during the excavation process and conducts numerical analysis, comprehensively considering the feasibility of the mining plan and the on-site impact caused, so as to evaluate the applicability of the mining plan. Compared with the simulation method of preset faults, the difference between the coal seam mining experiment simulation device and simulation method based on the influence of fault evolution is smaller at the levels of theoretical research and on-site construction, and the results obtained are more likely to be applicable on-site.

[0021] To make the above objects, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given below and described in detail in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] In the following, the present invention will be described in more detail based on the embodiments and with reference to the drawings. Among them:

[0024] Figure 1 Shows a partial structural schematic diagram of the coal seam mining experimental simulation device provided by the embodiment of the present invention under the influence of fault evolution;

[0025] Figure 2 Shows an installation schematic diagram of the sensors of the coal seam mining experimental simulation device provided by the embodiment of the present invention under the influence of fault evolution;

[0026] Figure 3 Shows a structural schematic diagram of the pressurizing component and the control component of the coal seam mining experimental simulation device provided by the embodiment of the present invention under the influence of fault evolution;

[0027] Figure 4 Shows a flowchart of the coal seam mining experimental simulation method provided by the embodiment of the present invention.

[0028] In the drawings, the same components are denoted by the same reference numerals. The drawings are not drawn to actual scale.

[0029] Reference numerals:

[0030] 100 - Coal seam mining experimental simulation device under the influence of fault evolution; 110 - Experimental cavity; 111 - Front side plate; 112 - Rear side plate; 113 - Left side plate; 114 - Right side plate; 115 - Lower bottom plate; 120 - Pressurizing component; 121 - Pressurizing bracket; 122 - Pressurizing member; 123 - Bearing baffle; 130 - Sensor; 131 - Stress sensor; 132 - Horizontal displacement sensor; 133 - Vertical displacement sensor; 140 - Control component; 150 - Experimental platform; 151 - Platform plate; 152 - Support feet. Detailed implementation manners

[0031] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0034] In the present invention, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. 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.

[0035] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] The embodiment of the present invention provides a coal seam mining experimental simulation device and simulation method under the influence of fault evolution, so as to simulate a simulation fault that is more fitted to the geometric shape and mechanical environment of the real fault to be studied, thereby realizing the real restoration of the evolution and growth process of the fault, and at the same time providing a model guarantee for the coal seam excavation plan and related research.

[0038] Please refer to Figure 1 、 Figure 2 and Figure 3 , the coal seam mining experimental simulation device 100 provided by the embodiment of the present invention under the influence of fault evolution. The coal seam mining experimental simulation device 100 under the influence of fault evolution includes:

[0039] An experimental cavity 110, which is used for laying experimental samples and provides a laying space for the experimental samples.

[0040] Two groups of pressurizing components 120 are arranged on opposite sides of the experimental cavity 110. The two groups of pressurizing components 120 are used to pressurize the experimental cavity 110. The pressurizing components 120 pressurize the experimental cavity 110 so that the experimental samples in the experimental cavity 110 are displaced and fractured, and finally form the geological fault to be simulated.

[0041] Multiple groups of sensors 130 are placed at intervals in the experimental samples. The multiple groups of sensors 130 respectively detect the displacement and stress information at different positions of the experimental samples. During the geological fault simulation stage, the multiple groups of sensors 130 respectively send the detected displacement and stress information at different positions of the experimental samples to the control component 140, so that the control component 140 controls the two groups of pressurizing components 120 to pressurize the experimental cavity 110, and finally makes the displacement and stress information at different positions of the experimental samples detected by the multiple groups of sensors 130 consistent with the displacement and stress information of the fault to be simulated, thereby completing the simulation of the fault to be simulated; during the coal seam excavation stage, the multiple groups of sensors 130 respectively detect the displacement and stress information at different positions of the experimental samples, and send the detected displacement and stress information at different positions of the experimental samples to the control component 140 to complete the information monitoring during the coal seam excavation process of the experimental samples, thereby evaluating the coal seam excavation plan.

[0042] A control component 140, which is electrically connected to the two groups of pressurizing components 120 and the multiple groups of sensors 130 respectively. During the geological fault simulation stage, the control component 140 controls the two groups of pressurizing components 120 to pressurize the experimental cavity 110 according to the detection information of the multiple groups of sensors 130, and finally makes the displacement and stress information at different positions of the experimental samples detected by the multiple groups of sensors 130 consistent with the displacement and stress information of the fault to be simulated, thereby completing the simulation of the fault to be simulated; during the coal seam excavation stage, the control component 140 evaluates the coal seam excavation plan according to the displacement and stress information at different positions of the experimental samples detected by the multiple groups of sensors 130.

[0043] The coal seam mining experimental simulation device 100 based on the influence of fault evolution provided by the embodiments of the present invention. The control component controls two pressurizing components 120 to pressurize the experimental cavity 110 according to the detection information of multiple groups of sensors, so that the detection information of up to multiple groups of sensors 130 fits the data information of the real fault to be simulated, thereby simulating the geological fault to be studied. This coal seam mining experimental simulation device based on the influence of fault evolution can reproduce the entire process of the evolution of geological faults under tectonic movements, and finally form a simulated fault that fits the real fault to be studied. Based on this simulated fault, theoretical research and mining excavation monitoring are carried out. A small pneumatic rock drill, drill pipe, and shovel are used in combination with the designed coal seam mining plan for excavation. Each group of sensors monitors the data information of the fault during the excavation process and conducts numerical analysis, comprehensively considering the feasibility of the mining plan and the on-site impact caused, so as to evaluate the applicability of the mining plan.

[0044] Compared with the simulation method of the preset fault, the differences between this coal seam mining experimental simulation device based on the influence of fault evolution are smaller at the levels of theoretical research and on-site construction, and the results obtained are more easily applicable on-site.

[0045] Specifically, the experimental cavity 110 includes a front side plate 111, a rear side plate 112, a left side plate 113, a right side plate 114, and a lower bottom plate 115. The front side plate 111, the rear side plate 112, the left side plate 113, the right side plate 114, and the lower bottom plate 115 form an open cavity, and the front side plate 111 is detachably connected to the left side plate 113 and the right side plate 114 respectively, and the rear side plate 112 is detachably connected to the left side plate 113 and the right side plate 114 respectively. One group of pressurizing components 120 is located outside the left side plate 113, and the other group of pressurizing components 120 is located outside the right side plate 114.

[0046] During use, the front side plate 111 is detached from the left side plate 113 and the right side plate 114 respectively, and the rear side plate 112 is detached from the left side plate 113 and the right side plate 114 respectively. A layer of experimental samples is laid on the lower bottom plate 115, and multiple groups of sensors are evenly laid in the experimental samples during the laying process. Then, the front side plate 111 is connected to the left side plate 113 and the right side plate 114 respectively, and the rear side plate 112 is connected to the left side plate 113 and the right side plate 114 respectively. Wait for the entire experimental sample to be saturated and solidified for 24 hours, so that the experimental sample simulates a complete stratum.

[0047] In a specific embodiment, the front side plate 111 and the rear side plate 112 are made of conventional iron iron plates in the art, with a size of 3m × 2.4m. The front side plate 111 and the rear side plate 112 are each hinged to the left side plate 113 and the right side plate 114 by 2 bolt-type hinges. The left side plate 113 and the right side plate 114 are made of conventional 12cr1mov alloy steel plates in the art, with a size of 2m × 2.4m. This kind of alloy steel plate has a certain strength and elasticity. It is bolt-connected to the front side plate 111 and the rear side plate 112, which is convenient for the disassembly of the front side plate 111 and the rear side plate 112 and facilitates subsequent excavation. Of course, it can be understood that the front side plate 111 and the rear side plate 112 can also be made of other conventional materials in the art, and the size can also be other values. The front side plate 111 and the rear side plate 112 can also be detachably connected to the left side plate 113 and the right side plate 114 by other components. The left side plate 113 and the right side plate 114 can also be made of other conventional materials in the art, and the size can also be other values, which are not limited herein.

[0048] The above-mentioned coal seam mining experimental simulation device 100 under the influence of fault evolution. Specifically, the pressurizing assembly 120 includes a pressurizing bracket 121 and a plurality of pressurizing members 122 spacedly installed on the pressurizing bracket 121. The pressurizing bracket 121 is fixedly installed relative to the lower bottom plate 115. The plurality of pressurizing members 122 are used to pressurize the left side plate 113 or the right side plate 114. The control assembly 140 controls one or more of the plurality of pressurizing members 122 to locally pressurize the experimental sample according to the detection information of the plurality of sensors 130, simulating small faults and small pores. The dynamic continuous simulation can ensure the continuity of the fault evolution process simulation, so as to simulate a simulation fault that more conforms to the required geological fault to be studied.

[0049] Furthermore, the pressurizing assembly 120 further includes a bearing baffle 123. The pressurizing member 122 acts on the left side plate 113 or the right side plate 114 through the bearing baffle 123. The pressurizing member 122 acts on the left side plate 113 or the right side plate 114 through the bearing baffle 123. Since the bearing baffle 123 increases the acting area of the pressurizing member 122 on the left side plate 113 or the right side plate 114, therefore, the acting pressure of the pressurizing member 122 on the left side plate 113 or the right side plate 114 is reduced, and the acting of the pressurizing member 122 on the left side plate 113 or the right side plate 114 can be made more uniform.

[0050] In a specific embodiment, the pressurizing bracket 121 is fixedly installed on the lower bottom plate 115. The pressurizing member 122 is selected as a jack. The left side plate 113 and the right side plate 114 are 2.4 m high. A jack is arranged on the pressurizing bracket 121 at intervals of 0.5 m. At the same time, a small hole is dug every 0.5 m on the force-applying bracket synchronously for leading the control line of the jack. The jack is selected as a hydraulic thin-type jack, which is convenient for dynamically controlling the pressing force, and the conversion between digital signals and electrical signals is also relatively convenient. Of course, it can be understood that the pressurizing member 122 can also be selected as other pressurizing components, as long as it can pressurize the left side plate 113 or the right side plate 114 according to the structural control signal. The distance between two adjacent jacks can also be other values, and other types of jacks can also be selected for the jacks, which are not limited herein.

[0051] For the above-mentioned coal seam mining experimental simulation device 100 affected by fault evolution, further, each group of sensors 130 includes a stress sensor 131, a horizontal displacement sensor 132, and a vertical displacement sensor 133. The stress sensor 131 is used to detect the stress of the experimental sample, the horizontal displacement sensor 132 is used to detect the horizontal displacement of the experimental sample, and the vertical displacement sensor 133 is used to detect the vertical displacement of the experimental sample. The stress sensor 131, the horizontal displacement sensor 132, and the vertical displacement sensor 133 respectively detect the stress, horizontal displacement, and vertical displacement of the experimental sample, which can dynamically monitor the formation of the fault evolution of the experimental sample and the changes in the spatial position and mechanical environment parameters of the fault during the mining process, and at the same time provide real-time data support reference for the pressurizing assembly 120. The sensors 130 are arranged at intervals in both the horizontal and vertical directions of the experimental sample, which is convenient for detecting the data information of each position of the experimental sample.

[0052] During use, the experimental samples are stacked and laid in the bearing experimental cavity 110, and the strata are numbered. The size of each stratum is 3 m × 2 m × 0.2 m. During the laying process, a group of sensors 130 (stress sensor 131, horizontal displacement sensor 132, and vertical displacement sensor 133) are laid at intervals of 15 cm in the length direction, and a group of sensors 130 are laid at intervals of 20 cm in the width direction. The sensors 130 are numbered according to the three-digit coding principle. The first digit represents the stratum number, the second digit represents the row number, and the third digit represents the column number. For example, 111 represents the 1st stratum, 1st row, and 1st column. Repeat the above operation 12 times and number the strata as 1, 2, 3, 4... 11, 12 in sequence.

[0053] The above-mentioned experimental simulation device 100 for coal seam mining under the influence of fault evolution. Further, the control component 140 includes an information acquisition processor, a FLAC3D numerical simulator, and a signal converter. The information acquisition processor is used to receive the data information from the stress sensor 131, the horizontal displacement sensor 132, and the vertical displacement sensor 133. The FLAC3D numerical simulator is used to check and analyze the data information received by the information acquisition processor, and at the same time draw the required numerical curves. The signal converter transmits the verification result to the pressurization component 120 in the form of a digital signal to automatically perform local pressurization adjustment, gradually making the drawn numerical curve fully fit the analysis and comparison curve.

[0054] The above-mentioned experimental simulation device 100 for coal seam mining under the influence of fault evolution. Further, the experimental simulation device 100 for coal seam mining under the influence of fault evolution further includes an experimental platform 150, and the experimental cavity 110 is placed on the experimental platform 150. The experimental platform 150 provides an experimental position for the experimental cavity 110. Specifically, the experimental platform 150 includes a platform board 151 and a plurality of support feet 152. The plurality of support feet 152 are arranged at intervals at the bottom of the platform board 151, and the platform board 151 is placed on the ground through the plurality of support feet 152. The above-mentioned experimental simulation device 100 for coal seam mining under the influence of fault evolution further includes a filler bucket, and the filler bucket is hung on the experimental platform 150. The filler bucket is used to load experimental samples.

[0055] Please refer to Figure 4 , the embodiment of the present invention also provides a simulation method for the above-mentioned experimental simulation device 100 for coal seam mining under the influence of fault evolution, including the steps:

[0056] S1: Lay experimental samples in the experimental cavity 110 and place multiple groups of sensors 130;

[0057] Use river sand and calcium carbonate to make experimental samples by mixing different material ratios according to the differences in geological conditions. Remove the front side plate 111 from the left side plate 113 and the right side plate 114 respectively, and remove the rear side plate 112 from the left side plate 113 and the right side plate 114 respectively. Lay a layer of experimental samples on the lower bottom plate 115, and evenly lay multiple groups of sensors in the experimental samples during the laying process. Then connect the front side plate 111 to the left side plate 113 and the right side plate 114 respectively, and connect the rear side plate 112 to the left side plate 113 and the right side plate 114 respectively. Wait for the entire experimental sample to saturate and solidify for 24 hours to make the experimental sample simulate a complete stratum.

[0058] S2: Control the two pressurization components 120 to pressurize the experimental cavity 110 according to the detection information of multiple groups of sensors until the detection information of multiple groups of sensors fits the data information of the real fault to be simulated.

[0059] The pressurizing assembly 120 locally pressurizes the experimental cavity 110 (with a small pre-value). Multiple groups of sensors 130 collect data, and the real-time data collected by the sensors is transmitted to the control assembly 140 for numerical analysis and simulation. In this embodiment, the control assembly 140 includes an information acquisition processor, a FLAC3D numerical simulator, and a signal converter. The information acquisition processor is used to receive the data information of the stress sensor 131, the horizontal displacement sensor 132, and the vertical displacement sensor 133. The FLAC3D numerical simulator is used to check and analyze the data information received by the information acquisition processor and simultaneously draw the required numerical curves. The signal converter transmits the verification result to the pressurizing assembly 120 in the form of a digital signal to automatically adjust the local pressurization, gradually making the drawn numerical curve fully fit the analysis and comparison curve.

[0060] S3: Excavate the experimental sample in combination with the designed mining plan, and at the same time, multiple groups of sensors send the detection information to the control assembly for analysis.

[0061] Remove the front side plate 111 from the left side plate 113 and the right side plate 114 respectively, and remove the rear side plate 112 from the left side plate 113 and the right side plate 114 respectively. Use a small pneumatic rock drill, drill rod, and shovel to excavate in combination with the designed coal seam mining plan. Each sensor 130 monitors the two mechanical parameter indicators of stress and displacement of the fault during the excavation process. The FLAC3D numerical simulation analysis center conducts numerical analysis on the collected data by drawing stress-displacement related curves, stress development curves, and displacement development curves, and comprehensively considers the feasibility of the mining plan and the on-site impact caused, so as to evaluate the applicability of the mining plan.

[0062] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Although the present invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Accordingly, it should be understood that numerous modifications may be made to the exemplary embodiments, and other arrangements may be designed, without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in a manner different from that described in the original claims. It should also be understood that the features described in connection with a separate embodiment may be used in other described embodiments.

Claims

1. A coal seam mining experimental simulation device under the influence of fault evolution, characterized in that, the coal seam mining experimental simulation device under the influence of fault evolution includes: An experimental cavity for accommodating experimental samples to prepare coal seams or strata; Two groups of pressurizing components arranged on opposite sides of the experimental cavity, and the two groups of pressurizing components are used to locally or globally pressurize the experimental cavity; Multiple groups of sensors spaced in the experimental samples; and A control component electrically connected to the two groups of pressurizing components and multiple groups of sensors respectively, and the control component is used to control the two groups of pressurizing components according to the detection index information of multiple groups of sensors to achieve dynamic automatic pressurization; Among them, each group of sensors includes a stress sensor, a horizontal displacement sensor, and a vertical displacement sensor. The stress sensor is used to detect the stress change of the experimental sample, the horizontal displacement sensor is used to detect the horizontal displacement change of the experimental sample, and the vertical displacement sensor is used to detect the vertical displacement change of the experimental sample.

2. The coal seam mining experimental simulation device under the influence of fault evolution according to claim 1, characterized in that, The experimental cavity includes a front side plate, a rear side plate, a left side plate, a right side plate, and a lower bottom plate that enclose the experimental cavity, and the front side plate is detachably connected to the left side plate and the right side plate respectively, and the rear side plate is detachably connected to the left side plate and the right side plate respectively. One group of the pressurizing components is located outside the left side plate, and the other group of the pressurizing components is located outside the right side plate.

3. The coal seam mining experimental simulation device under the influence of fault evolution according to claim 1, characterized in that, The pressurizing component includes a pressurizing bracket and a plurality of pressurizing members spacedly installed on the pressurizing bracket, and the plurality of pressurizing members are used to pressurize opposite side plates of the experimental cavity.

4. The coal seam mining experimental simulation device under the influence of fault evolution according to claim 2, characterized in that, The pressurizing component further includes a bearing baffle, and the pressurizing member acts on the left side plate or the right side plate through the bearing baffle.

5. The coal seam mining experimental simulation device under the influence of fault evolution according to claim 1, characterized in that, The sensors are spacedly arranged in both the horizontal and vertical directions of the experimental sample.

6. The coal seam mining experimental simulation device under the influence of fault evolution according to claim 1, characterized in that, The coal seam mining experimental simulation device under the influence of fault evolution further includes an experimental platform. The experimental cavity is placed on the experimental platform, and the experimental platform includes a platform plate and a plurality of support feet, and the plurality of support feet are spacedly arranged at the bottom of the platform plate.

7. The coal seam mining experimental simulation device under the influence of fault evolution according to claim 6, characterized in that, The coal seam mining experimental simulation device under the influence of fault evolution further includes a filling bucket, and the filling bucket is hung on the experimental platform and is used to fill the experimental sample.

8. A simulation method for a coal seam mining experimental simulation device based on the influence of fault evolution as described in any one of claims 1 to 7 above, characterized in that, it includes the steps of: Laying experimental samples in the experimental cavity and synchronously placing multiple groups of sensors; Controlling two groups of pressurizing components to pressurize the experimental cavity according to the detection information of multiple groups of the sensors until the feedback images and information of multiple groups of the sensors fit the images and mechanical data information of the real fault to be simulated; Combining the designed mining plan to excavate the experimental samples, and at the same time, multiple groups of the sensors send dynamic detection information to the control component for analysis of mining movement laws.

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