Method, device and system for blocking air leakage channel in mine

Abstract

The invention discloses a plugging method, device and system for an air leakage channel in a mine. The method comprises the following steps: acquiring a vertical section image of a rock stratum in a mine; based on the vertical profile images, height information of caving zones corresponding to the different types of rock stratums is determined; based on the height information and distance information between a working face of the mine and a roadway in the mine, angle information of a foam injection hole in the mine is determined, and the working face is an area where a mining operation task is being executed in the mine; a target air leakage area of the goaf in the mine is determined, and according to the angle information, the foam injection pipe extends into the target air leakage area through the foam injection hole so as to block an air leakage channel between the goaf and the external environment of the mine and an air leakage channel between the goaf and the working face, the goaf is an area where a mining operation task is executed in the mine. The technical problem that an air leakage channel in a mine cannot be effectively blocked is solved.

Description

Technical Field

[0001] The invention relates to the technical field of fire prevention and extinguishing of shallow buried deep self-igniting coal seams, and in particular to a method, device and system for blocking air leakage channels in mines. Background Art

[0002] At present, with the further development of China's coal resources, deep and deep coal resources are being mined in large quantities. The underground mining conditions of high-gas mines and high-stress, high-water pressure, high-sulfur, and self-ignition-prone coal seams are becoming increasingly complex, which puts higher requirements on the safe mining of mines. Especially when mining coal seams with high self-ignition tendency, it is easy for the ventilation system to cause air flow turbulence, resulting in air leakage in the goaf and causing spontaneous combustion of coal seams.

[0003] In the related technologies, the prevention and control measures for coal seam spontaneous combustion mainly adopt the preventive grouting fire prevention method, which uses drilling and grouting pipes to inject inert materials into deep holes in the coal seam to isolate the air, reduce the temperature of the coal seam, and inhibit the spontaneous combustion of the coal seam. However, the drilling grouting method requires certain drilling equipment and grouting materials, which is difficult to construct, costly, and requires strict construction conditions. Therefore, there is still a technical problem that the leaky channels in the mine cannot be effectively blocked.

[0004] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method, device and system for blocking an air leakage channel in a mine, so as to at least solve the technical problem that the air leakage channel in the mine cannot be effectively blocked.

[0006] According to one aspect of an embodiment of the present invention, a method for blocking an air leakage channel in a mine is provided. The method may include: obtaining a vertical profile image of a rock layer in a mine, wherein the vertical profile image is used to represent the distribution of different types of rock layers at different depths in the mine; determining the height information of the caving zones corresponding to different types of rock layers based on the vertical profile image, wherein the caving zone is an area of ​​rock layers in an abnormal state; determining the angle information of a foam injection hole in the mine based on the height information and the distance information between the working face of the mine and the tunnel in the mine, wherein the working face is an area in the mine where mining operations are being performed; determining a target air leakage area of ​​a goaf in the mine, and extending a foam injection pipe into the target air leakage area through the foam injection hole according to the angle information, so as to block the air leakage channel between the goaf and the external environment of the mine, and the air leakage channel between the goaf and the working face, wherein the goaf is an area in the mine where mining operations have been performed, and the air leakage degree in the goaf of the target air leakage area is higher than the air leakage degree threshold.

[0007] Optionally, based on the vertical profile image, the height information of the caving zones corresponding to different types of rock formations are determined respectively, including: determining the hardness grades of different types of rock formations from the vertical profile image; and determining the height information of the caving zones corresponding to different hardness grades.

[0008] Optionally, the hardness grade includes a first hardness grade, a second hardness grade, a third hardness grade and a fourth hardness grade, the hardness of the rock formation of the first hardness grade is greater than the hardness of the rock formation of the second hardness grade, the hardness of the rock formation of the third hardness grade is greater than the hardness of the rock formation of the fourth hardness grade, and the hardness of the rock formation of the second hardness grade is greater than the hardness of the rock formation of the third hardness grade, wherein the height information of the caving zones corresponding to different hardness grades is determined respectively, including: based on the total thickness of the rock formation in the mine, the height information of the caving zones corresponding to different hardness grades is determined respectively.

[0009] Optionally, the method further includes: determining a target lane adjacent to the working surface from the lanes; and determining distance information between the target lane and the working surface.

[0010] Optionally, based on the height information and the distance information between the working face of the mine and the tunnel in the mine, the angle information of the foam injection hole in the mine is determined, including: determining the angle information based on the distance between the foam injection hole and the target tunnel, and the distance information.

[0011] Optionally, determining a target air leakage area in a goaf in a mine includes: deploying a gas release point, a first measuring point, a second measuring point and a third measuring point in the goaf, wherein the spacing between the first measuring point and the second measuring point is the same as the spacing between the second measuring point and the third measuring point; releasing the target gas at the gas release point, and detecting the gas concentrations at the positions of the first measuring point, the second measuring point and the third measuring point; determining a first gas concentration peak time difference between the first measuring point and the second measuring point, and a second gas concentration peak time difference between the second measuring point and the third measuring point based on the gas concentration; determining a first wind speed between the first measuring point and the second measuring point based on the spacing and the first gas concentration peak time difference, and determining a second wind speed between the second measuring point and the third measuring point based on the spacing and the second gas concentration peak time difference; determining a target air leakage area based on the difference between the first wind speed and the second wind speed, wherein the difference is positively correlated with the degree of air leakage.

[0012] Optionally, determining the target air leakage area based on the difference between the first wind speed and the second wind speed includes: in response to the difference exceeding a difference threshold, determining the target air leakage area based on the second measuring point.

[0013] Optionally, the air leakage channel includes an external air leakage channel and an internal air leakage channel, and the foam injection hole includes a high-position foam injection hole and a low-position foam injection hole, the high-position foam injection hole is used to block the external air leakage channel between the goaf and the external environment, and the low-position foam injection hole is used to block the internal air leakage channel between the goaf and the working face, wherein the foam injection pipe is extended into the target air leakage area through the foam injection hole to block the air leakage channel between the goaf and the external environment of the mine, as well as the air leakage channel between the goaf and the working face, including: extending the foam injection pipe into the target air leakage area through the high-position foam injection hole, and controlling the foam injection pipe to inject foam into the target air leakage area to block the external air leakage channel; extending the foam injection pipe into the target air leakage area through the low-position foam injection hole, and controlling the foam injection pipe to inject foam into the target air leakage area to block the internal air leakage channel.

[0014] According to another aspect of an embodiment of the present invention, a device for indicating rock formation stress in a mine is provided. The device may include: an acquisition unit, used to acquire a vertical profile image of a rock layer in a mine, wherein the vertical profile image is used to represent the distribution of different types of rock layers at different depths in the mine; a first determination unit, used to determine the height information of the caving zone corresponding to different types of rock layers based on the vertical profile image, wherein the caving zone is an area of ​​rock layers in an abnormal state above the working surface of the mine, and the working surface is an area in the mine where mining operations are being performed; a second determination unit, used to determine the angle information of the foam injection hole in the mine based on the height information and the distance information between the working surface of the mine and the tunnel in the mine, wherein the working surface is an area in the mine where mining operations are being performed; a blocking unit, used to determine a target air leakage area of ​​a goaf in the mine, and according to the angle information, extend a foam injection pipe through the foam injection hole into the target air leakage area to block the air leakage channel between the goaf and the external environment of the mine, and the air leakage channel between the goaf and the working surface, wherein the goaf is an area in the mine where mining operations have been performed, and the air leakage degree in the goaf of the target air leakage area is higher than the air leakage degree threshold.

[0015] According to another aspect of an embodiment of the present invention, a system for prompting rock formation stress in a mine is also provided. The system may include: a foam proportion mixing device for mixing a foaming agent with water to generate foam; a gas-liquid mixing device connected to the foam proportion mixing device for mixing foam with compressed air to form a foam delivery flow; a foam delivery pipeline connected to the gas-liquid mixing device for delivering the foam delivery flow to a high-position foam injection hole and a low-position foam injection hole in the mine in response to the existence of a target air leakage area in the goaf in the mine, wherein the goaf is an area in the mine where mining operations have been performed, and the target air leakage area is an area in the goaf where the air leakage level is higher than the air leakage level threshold; the high-position foam injection hole is used to inject the foam delivery flow into the target air leakage area to block the air leakage channel between the goaf and the external environment of the mine; A low-level foam injection hole is used to inject the foam conveying flow into the target air leakage area to block the air leakage channel between the goaf and the working face in the mine, wherein the working face is the area in the mine where mining operations are being performed, and the angle information of the low-level foam injection hole is determined based on the height information of the caving zone in the mine and the distance information between the working face and the tunnel in the mine, and the height information is determined based on the vertical profile image of the rock formation in the mine, and the vertical profile image is used to represent the distribution of different types of rock formations at different depths in the mine, and the caving zone is an area of ​​rock formations in an abnormal state in the mine; a power device is connected to the foam proportion mixing device, and is used to provide power to the foam proportion mixing device and the gas-liquid mixing device.

[0016] According to another aspect of the embodiments of the present invention, a computer-readable storage medium is also provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method of the embodiments of the present invention.

[0017] According to another aspect of an embodiment of the present invention, a processor is provided, which is used to run a program, wherein the method of the embodiment of the present invention is executed when the program is run.

[0018] According to another aspect of an embodiment of the present invention, a computer program product is further provided. The computer program product includes a computer program, and when the computer program is executed by a processor, the method of the embodiment of the present application is implemented.

[0019] In the embodiment of the present invention, through the vertical profile analysis of the rock formation, the calculation of the height of the caving zone, the angle design of the foam injection hole and the fixed-point foam injection strategy, the effective blocking of the air leakage channel in the goaf of the mine is achieved. By obtaining the vertical profile image of the rock formation in the mine, the type and distribution of the rock formation at different depths can be intuitively understood. Through the vertical profile image, the height of the caving zone corresponding to different rock formation types can be accurately calculated, ensuring the fixed point and pertinence of the subsequent foam injection, and improving the reliability of the blocking effect. Based on the height information of the caving zone and the distance between the working face and the tunnel, the angle of the foam injection hole is scientifically determined to ensure that the foam can be accurately injected into the caving zone area to block the air leakage channel between the goaf and the outside world. The reasonable design of the angle is the key to the effective diffusion and coverage of the foam, which can maximize the blocking efficiency of the foam and reduce unnecessary foam consumption. The target air leakage area in the goaf is determined by the mine ventilation monitoring system. The foam injection pipe is directly extended into the above-mentioned target air leakage area, which can be targeted for blocking, avoiding blind operation and improving the efficiency of fire prevention and extinguishing measures. Through low-level fixed-point injection of foam, the air leakage channel between the working face and the goaf is further blocked, the oxygen supply is reduced, and the spontaneous combustion of coal is effectively prevented. The spontaneous combustion of coal in the goaf is usually related to the supply of oxygen, and oxygen mainly enters through the caving zone and the air leakage channel between the working face and the goaf. Through the above-mentioned blocking method, the amount of oxygen entering the goaf can be significantly reduced, thereby reducing the risk of spontaneous combustion of coal and ensuring the safety of the mine. Blocking the air leakage channel can not only reduce the oxygen supply in the goaf, but also improve the ventilation conditions of the mine. It avoids the waste of fresh air flow and improves the directionality and controllability of the air flow, which is of great significance for saving energy, reducing ventilation costs, and optimizing the mine ventilation system.

[0020] In this embodiment, it is considered that the fire prevention and extinguishing measures in the relevant technology often lack pertinence and have limited effects. The above method realizes the precise blocking of the air leakage channel through precise positioning and fixed-point foam injection, improves the efficiency and pertinence of the fire prevention and extinguishing technology, and has significant technical advantages for preventing and controlling coal mine fires. The above method realizes the precise blocking of the air leakage channel in the goaf area of ​​the mine through rock layer analysis, caving zone calculation, foam fixed-point injection and other links, which can not only effectively prevent coal spontaneous combustion and reduce the risk of safety accidents, but also optimize ventilation management. Thereby achieving the technical effect of effectively blocking the air leakage channel in the mine, solving the technical problem that the air leakage channel in the mine cannot be effectively blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0022] Figure 1is a flow chart of a method for blocking an air leakage channel in a mine according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall implementation structure of a device for plugging air leakage by injecting foam into the vertex of a triangular belt of a tunnel-side goaf according to an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of a foam fixed-point injection into a triangular zone of a goaf according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of injecting foam into a goaf to plug air leakage according to an embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of a plugging effect of foam injection into a goaf according to an embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of an air leakage monitoring calculation method according to an embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of a foam proportion mixing device structure according to an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of a blocking device for an air leakage channel in a mine according to an embodiment of the present invention;

[0030] Fig. 9 It is a schematic diagram of a blocking system for an air leakage channel in a mine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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 should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] According to an embodiment of the present invention, an embodiment of a method for blocking an air leakage channel in a mine is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0034] Figure 1 is a flow chart of a method for blocking an air leakage channel in a mine according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0035] Step S102, obtaining a vertical cross-sectional image of the rock layer in the mine.

[0036] In the technical solution provided in the above step S102 of the present invention, the vertical profile image can be used to represent the distribution of different types of rock layers at different depths in the mine. The vertical profile image shows in detail the type, thickness, inclination and continuity of the rock layers at different depths in the mine. This information is crucial for predicting the impact of mining on the rock layer, evaluating the stability of the rock layer, and understanding the impact of the rock layer on ventilation. The vertical profile image can be a columnar diagram of the lithology of the bottom layer of the mine.

[0037] In this embodiment, if it is necessary to seal the air leakage channel in the mine, a vertical profile image of the rock layer in the mine can be obtained.

[0038] Alternatively, in coal mining and mine ventilation management, obtaining vertical profile images of rock formations is a key geological survey and ventilation planning step. Vertical profile images can provide an intuitive display of underground rock formation structures, which is essential for understanding mine geological conditions, predicting ventilation and air leakage, and designing effective fire prevention and extinguishing measures.

[0039] Alternatively, a caving zone is an area where the overlying rock strata deform, crack and collapse due to stress release after mining. Through vertical profile images, combined with lithology, mining depth and mining methods, the formation height and range of the caving zone can be predicted. This is crucial for identifying air leakage channels and plugging targets, as caving zones are often closely related to the ventilation conditions of goafs. Vertical profile images can reveal the connectivity of the rock strata above the goaf, helping engineers assess the ventilation status of the mine and potential air leakage. The oxygen supply in the goaf is directly related to the risk of spontaneous combustion of coal. Image analysis can predict the possible sources and paths of oxygen, thereby formulating effective anti-air leakage measures.

[0040] Optionally, according to the rock formation information provided by the vertical profile image, the angle and depth of the foam injection hole can be scientifically and rationally designed to ensure that the foam can accurately reach the air leakage channel of the caving zone and the goaf. The above steps are the prerequisite for achieving effective foam plugging.

[0041] Step S104, based on the vertical section image, respectively determine the height information of the caving zones corresponding to different types of rock formations.

[0042] In the technical solution provided in the above step S104 of the present invention, the caving zone is a region of rock formation in an abnormal state. The height information may be a height range of the caving zone.

[0043] In this embodiment, after obtaining the vertical cross-sectional image of the rock layer in the mine, the height information of the caving zones corresponding to different types of rock layers can be determined based on the vertical surface image.

[0044] Optionally, the above process is a key part of the entire fire prevention and extinguishing technical solution, which involves predicting and determining the height information of the caving zone under different rock types by analyzing vertical profile images. The caving zone refers to the area formed during coal mining due to the release of stress in the overlying rock strata caused by mining activities, resulting in deformation, fracture and collapse of the rock strata. The formation and height of these areas directly affect the ventilation conditions of the coal mine, especially the air leakage problem in the goaf, which in turn affects the risk of spontaneous combustion of coal.

[0045] Optionally, the formation of the caving zone is mainly related to the mining depth, rock layer properties (such as lithology, strength, thickness and degree of fissure development, etc.) and mining methods. During the mining process, the stress distribution of the overburden rock layer will change, and some rock layers will lose their original continuity and stability, forming cracks and collapse, which constitute the caving zone. The rock layers in the caving zone are usually in an abnormal state, which is manifested by the destruction of the rock layer structure and the formation of air flow paths.

[0046] Optionally, the properties of the rock formation are analyzed, including the classification of the rock formation (such as hard, medium hard, soft, extremely soft, etc.), the strength index of the rock formation (such as the compressive strength f value), etc. The above information can be directly read from the vertical profile image, or combined with other geological data for comprehensive analysis. According to the properties of the rock formation, the theoretical calculation formula of the caving zone can be applied to predict the height range of the caving zone. The above formula is usually based on rock formation mechanics and mining influence theory, taking into account factors such as rock formation strength, mining depth and mining method. For areas with existing caving zones, vertical profile images are an intuitive tool that can directly observe and measure the height of the caving zone through image feature recognition technology. For example, features such as rock fractures, fissure development, and rock deformation in the image can be used as a basis for judging the height of the caving zone. The theoretical calculation results are combined with the image feature recognition results for comprehensive analysis. If necessary, the caving zone height information can be corrected through on-site investigation or drilling verification to ensure the accuracy of the data.

[0047] In an embodiment of the present invention, the height of the caving zone can be predicted more accurately through vertical profile images and rock formation property analysis, which is of great significance for guiding the design of foam injection holes and fixed-point foam injection. Determining the height information of the caving zone allows foam injection to accurately block the air leakage channel between the goaf and the outside world, reducing the supply of oxygen, thereby reducing the risk of coal spontaneous combustion. Accurate prediction of the height of the caving zone helps to identify potential ventilation and safety problems. Through measures such as fixed-point foam injection, coal mine fires can be effectively prevented and controlled to ensure the safe operation of the mine. Targeted foam injection reduces the waste of foam, improves the utilization efficiency of fire prevention and extinguishing resources, and plays an important role in reducing mining costs and improving economic benefits. In summary, by comprehensively analyzing the properties of the rock formation, applying theoretical formulas and using vertical profile images, the accuracy of the caving zone height prediction is improved, providing a scientific basis for the subsequent fixed-point foam injection method for plugging air leakage, effectively reducing the risk of coal spontaneous combustion in the goaf, and ensuring the safety and economic benefits of the mine.

[0048] Step S106, based on the height information and the distance information between the working face of the mine and the tunnel in the mine, determine the angle information of the foam injection hole in the mine.

[0049] In the technical solution of step S106 of the present invention, the working face may be an area in a mine where mining operations are being performed. The distance information may be the distance between the working face and the tunnel, for example, the distance between the working face and an adjacent tunnel. The angle information may be the construction angle of the foam injection hole (foam injection drilling hole).

[0050] In this embodiment, after determining the height information of the caving zones corresponding to different types of rock formations based on the vertical profile image, the angle information of the foam injection hole in the mine can be determined based on the height information and the distance information between the working face of the mine and the tunnel in the mine.

[0051] Optionally, the angle of the foam injection hole is designed based on existing geological information (eg, height information) and mining conditions to ensure that the foam can effectively block air leakage channels in the goaf and reduce the risk of spontaneous combustion of coal.

[0052] Optionally, the working face refers to the area in the mine where mining operations are ongoing or have just been completed, and is the space where miners directly carry out coal mining activities. The tunnel is a passage connecting the ground and the working face for the passage of personnel, equipment and materials, as well as ventilation, drainage and power supply. The distance information between the working face and the tunnel refers to the width of the protective coal pillar, that is, the distance from the edge of the working face to the nearest tunnel. The above distance directly affects the design of the foam injection hole, because the foam needs to enter the goaf from the tunnel through drilling, and the angle and depth of the drilling need to be adjusted according to the width of the protective coal pillar.

[0053] Optionally, the height information of the caving zone provides the upper and lower limits that the foam needs to block. The foam injection hole needs to be designed to enable the foam to reach the depth of the caving zone area, thereby effectively blocking the air leakage channel between the goaf and the outside world. The width of the protective coal pillar determines the horizontal distance from the tunnel to the goaf. The angle of the foam injection hole needs to ensure that the foam can cover the air leakage channel between the working face and the goaf, which usually means that the hole needs to be drilled at a certain angle in the direction of the goaf. Different geological conditions (such as rock formation inclination, hardness, fracture development, etc.) will also affect the design of the foam injection hole. Under soft rock conditions, a steeper angle may be required to ensure the penetration of the foam; under hard rock conditions, it may be necessary to consider the direction of the rock formation fractures and adjust the angle of the foam injection hole to optimize the foam propagation path.

[0054] In an embodiment of the present invention, the angle of the foam injection hole is reasonably designed to ensure that the foam can accurately cover the caving zone and the air leakage channel between the working face and the goaf, thereby reducing the waste of foam and improving the efficiency of fire prevention and extinguishing measures. By blocking these key air leakage channels, the penetration of oxygen into the goaf can be effectively reduced, thereby reducing the risk of spontaneous combustion of coal. The accurate design of the foam injection hole angle helps to improve the ventilation conditions of the mine, reduce unnecessary air leakage, optimize the wind flow structure, and improve the stability and reliability of the ventilation system. By accurately designing the injection hole angle, foam injection can be implemented without affecting normal mining activities, reducing the impact of fire prevention and extinguishing measures on production progress. The angle of the foam injection hole is adjusted according to geological conditions and mining conditions, so that the method is applicable to various different mine environments, improving the versatility and applicability of the technology. In summary, by comprehensively considering the height information of the caving zone and the distance information between the working face and the tunnel, the angle of the foam injection hole is determined, ensuring the accuracy and effectiveness of the fixed-point injection of foam, which is of great value in reducing the risk of spontaneous combustion of coal, improving ventilation conditions and ensuring safe production in mines.

[0055] Step S108, determine the target air leakage area of ​​the goaf in the mine, and according to the angle information, extend the foam injection pipe into the target air leakage area through the foam injection hole to block the air leakage channel between the goaf and the external environment of the mine, and the air leakage channel between the goaf and the working face.

[0056] In the technical solution provided in the above step S108 of the present invention, the goaf is an area in the mine where mining operations have been performed. The air leakage degree in the goaf of the target air leakage area is higher than the air leakage degree threshold. The target air leakage area can also be called a serious air leakage area.

[0057] In this embodiment, based on the height information and the distance information between the working face and the tunnel of the mine, the target air leakage area in the mine can be determined. And according to the angle information, the foam injection pipe can be extended into the target air leakage area through the foam injection hole to block the air leakage channel between the goaf and the external environment, and the air leakage channel between the goaf and the working face.

[0058] Optionally, the above process is the core link in the implementation of fire prevention and extinguishing technology, which aims to identify and determine the target leakage areas in the goaf where the leakage level exceeds the threshold, and then accurately inject foam into these areas according to the previously determined foam injection hole angle information, so as to effectively block the leakage channels between the goaf and the external environment and the working face, and reduce the risk of coal spontaneous combustion.

[0059] Optionally, a comprehensive assessment of the degree of air leakage in the goaf can be conducted before implementing foam sealing. This is usually achieved by monitoring air flow, changes in oxygen content, and possible changes in gas composition (such as abnormal increases in CO and CO2). Sulfur hexafluoride (SF6) gas tracer method is an effective means to evaluate wind speed and leakage channels by releasing SF6 in the air intake tunnel and monitoring its diffusion in the goaf.

[0060] Optionally, a reasonable air leakage threshold is set based on historical data, coal mine safety standards and expected risk control levels. Areas exceeding this threshold will be marked as target air leakage areas and foam plugging measures will be taken.

[0061] Alternatively, the location and range of air leakage channels in the goaf can be accurately located by using the coal mine ventilation monitoring system and geological exploration data. This information is the basis for targeted foam injection.

[0062] Optionally, the angle of the foam injection hole is determined, and the foam injection pipe is adjusted to a suitable position, so as to prepare to transport the foam to the target air leakage area through the tunnel compressed air pipeline and the foam delivery pipeline.

[0063] For example, before the foam is injected, equipment such as a foam liquid tank, a gas-liquid mixing device, and a foam proportion mixing device can be used to prepare foam according to a predetermined formula and ratio. The prepared foam is injected into the target air leakage area of ​​the goaf through the foam injection pipe and the foam injection hole. The high-position injection hole blocks the triangular area of ​​the caving zone, and the low-position injection hole blocks the triangular area of ​​the goaf behind the corner of the working face, thereby achieving all-round foam blocking. After the foam is injected, the ventilation conditions of the goaf can be continuously monitored, including parameters such as oxygen content, wind speed and temperature, to evaluate the effect of foam blocking. If it is found that the degree of air leakage in certain areas is still high, it may be necessary to adjust the position of the foam injection hole or increase the amount of foam injection.

[0064] In an embodiment of the present invention, by determining the target air leakage area and injecting foam at a fixed point, the air leakage channel in the goaf can be accurately blocked, oxygen penetration can be reduced, and the risk of coal spontaneous combustion can be effectively reduced. Blocking the air leakage channel can improve the ventilation conditions of the mine, ensure that fresh air can flow to the required area more effectively, and improve the stability and efficiency of the ventilation system. Reducing the oxygen supply in the goaf can reduce the risk of gas explosion and fire, and provide a safer working environment for miners. Effective foam blocking measures can reduce production interruptions caused by spontaneous combustion in the goaf, and avoid economic losses and waste of resources caused by it. Reducing coal spontaneous combustion not only reduces the safety risk of the mine, but also reduces the emission of harmful gases, which has a positive impact on environmental protection. In summary, by determining the target air leakage area and injecting foam at a fixed point, the precise blocking of the air leakage channel in the goaf is achieved, which has significant technical effects on reducing the risk of coal spontaneous combustion, improving mine ventilation conditions, ensuring operation safety and improving production efficiency, and is an important means in modern coal mine fire prevention and ventilation management.

[0065] The above method of this embodiment is further introduced below.

[0066] As an optional implementation method, step S104, based on the vertical profile image, determines the height information of the caving zones corresponding to different types of rock formations, including: determining the hardness grades of different types of rock formations from the vertical profile image; and determining the height information of the caving zones corresponding to different hardness grades.

[0067] In this embodiment, in the process of determining the height information of the caving zones corresponding to different types of rock formations based on the vertical section image, the hardness grades of different types of rock formations can be determined from the vertical section image. The height information of the caving zones corresponding to different hardness grades can be determined respectively.

[0068] Optionally, vertical profile images provide visual information of rock formations at different depths in the mine, including color, texture, structure, etc. of the rock formations. Different types of rock formations can be identified from the images by professional geological image analysis software or by the judgment of technical experts. Based on the image analysis, the type of rock formation is identified, such as quartz sandstone, limestone, sandy shale, sandstone, mudstone, etc. Each rock formation has its own specific physical and chemical properties, including hardness, porosity, permeability, etc. The rock formations are divided into different grades, such as hard, medium-hard, weak and very weak, based on their physical properties, especially hardness. This division helps to understand the response and deformation characteristics of the rock formation during the mining process.

[0069] Optionally, the hardness grade of the rock formation directly affects its stability during the mining process. Generally speaking, rock formations with higher hardness are more stable and form a lower caving zone height; while rock formations with lower hardness are more prone to fracture and collapse, forming a higher caving zone height. Based on the hardness grade of the rock formation, the theoretical calculation formula of the caving zone can be applied to predict its height. These formulas take into account factors such as the strength of the rock formation, the mining depth and the mining method, and can give an estimated range of the caving zone height. The rock formation hardness grade information of the vertical profile image is combined with the theoretical calculation results for a comprehensive analysis. In actual operation, other geological conditions such as the inclination angle of the rock formation and the degree of fissure development may also need to be considered to ensure the accuracy of the caving zone height information. In some cases, in order to confirm the predicted caving zone height, it may be necessary to verify it through on-site drilling and direct observation. This helps to correct the theoretical calculation results and ensure the scientificity and effectiveness of the design of fire prevention and extinguishing measures.

[0070] In an embodiment of the present invention, by combining the hardness grade of the rock formation with the theoretical calculation of the caving zone, the accuracy of the prediction of the caving zone height can be improved, which is very important for designing the position and angle of the foam injection hole. The caving zone heights formed by rock formations of different hardness grades are different, so different foam injection measures need to be taken. This embodiment can guide more accurate foam plugging and improve the efficiency and effectiveness of fire prevention and extinguishing measures. Understanding the stability of the rock formation helps predict possible rock formation collapse during the mining process, so as to take preventive measures, reduce the damage to the mine structure caused by mining activities, and reduce production risks. The determination of the caving zone height information helps to identify ventilation leakage channels in the mine, which is crucial for optimizing the ventilation system and reducing the risk of spontaneous combustion of coal.

[0071] In summary, by carefully analyzing the rock hardness grade in the vertical profile image and combining it with theoretical calculations, the height information of the caving zone was determined, which provided a scientific basis for the precise design and implementation of coal mine fire prevention and extinguishing measures, helped to improve the efficiency of fire prevention and extinguishing, and ensured the safe production and environmental safety of the mine.

[0072] As an optional implementation method, the hardness grade includes a first hardness grade, a second hardness grade, a third hardness grade and a fourth hardness grade, the hardness of the rock layer of the first hardness grade is greater than the hardness of the rock layer of the second hardness grade, the hardness of the rock layer of the third hardness grade is greater than the hardness of the rock layer of the fourth hardness grade, and the hardness of the rock layer of the second hardness grade is greater than the hardness of the rock layer of the third hardness grade, wherein the height information of the caving zones corresponding to different hardness grades is determined respectively, including: based on the total thickness of the rock layer in the mine, the height information of the caving zones corresponding to different hardness grades is determined respectively.

[0073] In this embodiment, in the process of respectively determining the height information of the caving zone corresponding to different hardness levels, the height information of the caving zone corresponding to different hardness levels can be respectively determined based on the total thickness of the rock formation in the mine. The hardness level includes a first hardness level, a second hardness level, a third hardness level and a fourth hardness level. The hardness of the rock formation of the first hardness level is greater than the hardness of the rock formation of the second hardness level. The first hardness level can be hard (hardness coefficient f = 40 ~ 80), for example, quartz sandstone, limestone, sandy shale and conglomerate can be included under this hardness level. The hardness of the rock formation of the second hardness level is greater than the hardness of the rock formation of the third hardness level. The second hardness level can be medium hard (hardness coefficient f = 20 ~ 40), for example, sandstone, mud limestone, sandy shale and shale can be included under this hardness level. The third hardness level can be weak (hardness coefficient f = 10 ~ 20), for example, mudstone, mud shale can be included under this hardness level. The hardness of the rock formation of the third hardness level is greater than the hardness of the rock formation of the fourth hardness level. The fourth hardness level may be extremely soft (hardness coefficient f<10), such as bauxite, weathered mudstone, clay, sandy clay, and the like.

[0074] Optionally, the above method further refines the method for determining the hardness grade of the rock formation and the caving zone height information by dividing the rock formation into four different hardness grades and based on the total thickness of the rock formation in the mine, respectively determining the caving zone height information corresponding to these hardness grades.

[0075] Optionally, the hardness grade is classified according to the physical properties of the rock formation, especially its compressive strength (hardness coefficient f). The hardness grade is divided into the first hardness grade, the second hardness grade, the third hardness grade and the fourth hardness grade, and is arranged in order from high to low hardness. The specific rock formation types are as follows: The first hardness grade (f = 40-80): including quartz sandstone, limestone, sandy shale and conglomerate. These rocks usually have high compressive strength, stable structure, and are not easy to deform and fracture. The second hardness grade (f = 20-40): including sandstone, mud limestone, sandy shale and shale. The hardness of these rock formations is inferior to the first hardness grade, but still has a certain stability and may be slightly deformed under higher mining pressure. The third hardness grade (f = 10-20): such as mudstone, muddy shale, etc. The hardness of these rock formations is relatively low, and it is more likely to fracture and collapse during mining, and the resulting caving zone is usually thicker. The fourth hardness grade (f < 10): including bauxite, weathered mudstone, clay and sandy clay, etc. These rock formations are extremely soft and easily broken and collapsed under the impact of mining, and the resulting caving zone is usually the highest.

[0076] Optionally, the total thickness of the rock formation in the mine is taken into account when determining the height of the caving zone. This parameter is an important basis for evaluating the size and location of the caving zone. The height of the caving zone will also vary with the total thickness of the rock formation. The hardness grade of the rock formation directly affects its stability during mining. Generally speaking, the higher the hardness grade, the more stable the rock formation and the lower the height of the caving zone formed; conversely, the lower the hardness grade, the easier the rock formation is to deform and collapse, and the higher the height of the caving zone formed. Based on the total thickness and hardness grade of the rock formation, specific theoretical calculation formulas or empirical formulas for the caving zone can be applied to predict the height of the caving zone. These formulas take into account factors such as the physical properties of the rock formation, the mining depth and the mining method. The above information is combined with the actual geological conditions of the mine for a comprehensive analysis and, if necessary, field verification to adjust and optimize the predicted results of the caving zone height.

[0077] In an embodiment of the present invention, by combining the hardness grade of the rock formation with the total thickness of the rock formation, the height information of the caving zone can be predicted more accurately, which is crucial for designing the position, angle and depth of the foam injection hole. According to the height information of the caving zone under the rock formations of different hardness grades, a more targeted foam injection strategy can be formulated to optimize the distribution of foam and improve the fire prevention and extinguishing effect. Understanding the height of the caving zone corresponding to different rock formation hardness grades is helpful to predict and prevent possible rock formation collapse during mining, ensure mining safety, and reduce damage to the mine structure. Based on the accurate prediction of the height information of the caving zone, the ventilation design of the mine can be optimized, air leakage can be reduced, the risk of spontaneous combustion of coal can be reduced, and the ventilation efficiency of the mine can be improved. In summary, by dividing the hardness grade of the rock formation in detail and combining it with the total thickness of the rock formation to predict the height information of the caving zone, an important reference is provided for the precise design of fire prevention and extinguishing measures in coal mines, which is helpful to improve operational safety, production and economic benefits, while reducing environmental risks.

[0078] For example, the height range of the caving zone can be determined by the following formula:

[0079] The height range of the fall zone of the first hardness grade is:

[0080] The height range of the fall zone of the second hardness grade is:

[0081]

[0082] Among them, H m It can be used to indicate the height range of the caving zone; M can be used to indicate the total thickness of the rock layer in the mine.

[0083] As an optional implementation mode, the method further includes: determining a target lane adjacent to the working surface from the lanes; and determining distance information between the target lane and the working surface.

[0084] In this embodiment, a target lane adjacent to the working face can be determined from the lanes, and the distance information between the target lane and the working face can be determined. The target lane can also be referred to as an adjacent lane. The distance information can be the distance between the working face and the adjacent lane.

[0085] Optionally, in the process of coal mining, the relationship between the working face and the adjacent tunnels is extremely critical, which not only affects the efficiency and safety of mining, but is also directly related to the management of the goaf and the implementation of fire prevention and extinguishing measures.

[0086] Optionally, the layout and location of the working faces in the mine are clarified. The working faces are the areas where mining is being carried out or will be carried out, while the target tunnels are the tunnels directly adjacent to these working faces and are used for ventilation, transportation, drainage and power supply. Identifying the target tunnels helps determine the construction location and direction of the foam injection holes. By analyzing the drawings and geological exploration reports of the mine, the specific location of the target tunnels and their relative relationship with the working faces can be determined. These materials usually contain information such as the direction, inclination angle, geological structure, etc. of the tunnels, which are the basis for selecting the target tunnels. Based on the mining plan and ventilation requirements, the target tunnels adjacent to the working faces are screened out from the tunnel network of the mine. These tunnels are key locations for the implementation of foam injection technology, through which the fixed-point plugging of the goaf can be achieved.

[0087] Optionally, use measuring tools or equipment, such as laser rangefinders, total stations, etc., to directly measure the distance between the working face and the target tunnel, which is an important parameter for determining the depth of the foam injection hole. Based on the actual distance measurement, check with the mine's drawings to ensure the accuracy of the measurement results. The drawings usually mark the designed spacing between the tunnel and the working face. Comparing with the actual measurement value can help identify possible geological changes or mining deviations. Record the determined distance information as a basis for designing the foam injection hole parameters. This information is crucial for subsequent calculations of foam injection volume, adjustment of the length of the foam delivery pipeline, etc.

[0088] In an embodiment of the present invention, determining the distance information between the target tunnel and the working face helps to accurately calculate the depth and construction angle of the foam injection hole, ensuring that the foam can be accurately injected into the key position of the goaf. Based on the target tunnel information adjacent to the working face, the foam injection strategy, such as the type, injection amount and frequency of foam, can be adjusted to adapt to specific mining conditions and ventilation requirements. Understanding the specific location and spacing between adjacent tunnels and working faces helps to take effective safety measures to prevent risks such as rock collapse, gas explosion and fire, and protect the lives of miners. By determining the distance information between adjacent tunnels and working faces, the layout of the ventilation system can be optimized, air leakage can be reduced, ventilation efficiency can be improved, and the risk of coal spontaneous combustion can be reduced. The spacing information between the target tunnel and the working face is of great significance for coordinating mining progress, equipment scheduling and logistics management, and helps to improve the production efficiency and economic benefits of the mine. In summary, by determining the target tunnel adjacent to the working face and the distance information between it and the working face, accurate geological and mining background data are provided for the implementation of foam injection technology, which helps to optimize the foam injection strategy and improve the safety and efficiency of mine mining.

[0089] As an optional implementation method, step S106 determines the angle information of the foam injection hole in the mine based on the height information and the distance information between the working face of the mine and the tunnel in the mine, including: determining the angle information based on the distance between the foam injection hole and the target tunnel and the distance information.

[0090] In this embodiment, in the process of determining the angle information of the foam injection hole in the mine based on the height information and the distance information between the working face and the tunnel of the mine, the angle information can be determined based on the distance between the foam injection hole and the target tunnel and the distance information. The distance between the foam injection hole and the target tunnel can be the distance from the construction position of the drilling hole (foam injection hole) to the tunnel floor, for example, which can be preset to 1.5m.

[0091] Optionally, the above method is about how to determine the angle information of the foam injection hole based on the height information of the caving zone and the distance information between the working face and the tunnel, so as to ensure that the foam can be accurately injected into the specific position of the goaf to achieve effective fire prevention and air leakage blocking goals.

[0092] Optionally, the distance between the foam injection hole and the target tunnel specifically refers to the vertical distance between the construction position of the foam injection hole and the tunnel floor. The above parameters are crucial in designing and constructing the foam injection hole, which directly affects the depth and direction of the drilling. Determining the angle information of the foam injection hole usually involves the application of trigonometric functions, especially the tangent function.

[0093] For example, the angle information can be determined by the following formula:

[0094]

[0095] Among them, θ can be used to represent angle information; l can be used to represent the distance between the foam injection hole and the target tunnel.

[0096] Optionally, accurate calculation of angle information is crucial for the construction of foam injection holes. It ensures that the foam can reach key locations in the goaf along the expected path, such as the caving zone triangle or the goaf triangle zone, thereby effectively blocking the air leakage channel and reducing the risk of spontaneous combustion of coal residues in the goaf. Based on the calculated angle information, the operator needs to adjust the position and drilling direction of the drilling equipment to ensure that the foam injection hole can be constructed at the designed inclination angle. This adjustment process needs to be combined with actual geological conditions and equipment capabilities, and may also require on-site verification and fine-tuning.

[0097] In an embodiment of the present invention, accurate angle information helps the foam to reach the target area more directly and efficiently, reduces waste and ineffective diffusion on the way, and improves the efficiency and cost-effectiveness of foam injection. The accuracy of the angle information directly affects the distribution and coverage of the foam in the goaf, ensures that the foam can effectively fill and block the air leakage channel between the goaf and the working face and the outside world, and enhances the effect of fire prevention and air leakage blocking. By accurately controlling the direction and depth of foam injection, the connection between the goaf and the ventilation system can be more effectively blocked, thereby optimizing the ventilation management of the mine and reducing the risk of spontaneous combustion of coal. The accurate calculation of angle information and the precise adjustment of construction parameters help to avoid rock instability or other geological risks that may be encountered during the foam injection process, and ensure the safety of operators and the normal operation of equipment. In summary, by applying the principle of trigonometric functions, the angle information of the foam injection hole is determined based on the vertical distance between the foam injection hole and the target tunnel (i.e., the height information of the caving zone from the tunnel floor) and the horizontal distance (the distance information between the working face and the tunnel). This process not only ensures that the foam can be accurately injected into key locations in the goaf, improving the effectiveness of fire prevention and extinguishing measures, but also optimizes the mine's ventilation management, ensuring operational safety and production efficiency.

[0098] As an optional implementation method, step S108, determining the target air leakage area of ​​the goaf in the mine, includes: deploying a gas release point, a first measuring point, a second measuring point and a third measuring point in the goaf, wherein the spacing between the first measuring point and the second measuring point is the same as the spacing between the second measuring point and the third measuring point; releasing the target gas at the gas release point, and detecting the gas concentrations at the positions of the first measuring point, the second measuring point and the third measuring point; based on the gas concentration, determining the first gas concentration peak time difference between the first measuring point and the second measuring point, and the second gas concentration peak time difference between the second measuring point and the third measuring point; determining the first wind speed between the first measuring point and the second measuring point based on the spacing and the first gas concentration peak time difference, and determining the second wind speed between the second measuring point and the third measuring point based on the spacing and the second gas concentration peak time difference; determining the target air leakage area based on the difference between the first wind speed and the second wind speed, wherein the difference is positively correlated with the degree of air leakage.

[0099] In this embodiment, in the process of determining the target air leakage area of ​​the goaf in the mine, a gas release point, a first measuring point, a second measuring point and a third measuring point can be deployed in the goaf. The target gas is released at the gas release point, and the gas concentrations at the positions of the first measuring point, the second measuring point and the third measuring point are detected. Based on the gas concentration, the first gas concentration peak time difference between the first measuring point and the second measuring point, and the second gas concentration peak time difference between the second measuring point and the third measuring point are determined. The first wind speed between the first measuring point and the second measuring point can be determined based on the spacing and the first gas concentration peak time difference, and the second wind speed between the second measuring point and the third measuring point can be determined based on the spacing and the second gas concentration peak time difference. Based on the difference between the first wind speed and the second wind speed, the target air leakage area is determined. Among them, the first measuring point can be represented by C1. The second measuring point can be represented by C2. The third measuring point can be represented by C3. The target gas can be SF6. The spacing between the first measuring point and the second measuring point is the same as the spacing between the second measuring point and the point measuring point. For example, the spacing can be pre-set to L. The difference is positively correlated with the degree of air leakage.

[0100] Optionally, the above method can be used to dynamically monitor and determine the air leakage area in the goaf of the mine. By deploying gas release points and multiple measuring points in the goaf and monitoring the time difference of the target gas concentration change, the wind speed can be calculated and the area with serious air leakage can be identified.

[0101] Optionally, an appropriate location is selected in the goaf as a gas release point for releasing tracer gases such as SF6 (sulfur hexafluoride). SF6 is often used to monitor mine ventilation and air leakage due to its chemical stability and the fact that it is not easily absorbed by coal seams. Three measuring points C1, C2 and C3 are set in the goaf, of which the first measuring point C1, the second measuring point C2 and the third measuring point C3 are used to monitor the concentration changes of SF6 gas. In order to ensure the comparability and accuracy of the measurement data, the spacing L between the first measuring point C1 and the second measuring point C2, and the spacing L between the second measuring point C2 and the third measuring point C3 should be kept consistent. After SF6 is released at the gas release point, the gas concentration changes at the three measuring points C1, C2 and C3 are detected in real time by sensors or monitoring equipment, and the time when the concentration peak arrives is recorded.

[0102] Optionally, the difference t1 of the peak concentration arrival time between the first measuring point C1 and the second measuring point C2 is recorded, which reflects the propagation time of the gas on this path. The difference t2 of the peak concentration arrival time between the second measuring point C2 and the third measuring point C3 is recorded, which also reflects the propagation time of the gas on this path.

[0103] Optionally, the first wind speed may be calculated using the following formula using the measurement point spacing L and the gas concentration peak time difference t1:

[0104]

[0105] Among them, V 1 Can be used to indicate the first wind speed.

[0106] Optionally, the second wind speed can be calculated by the following formula using the measurement point spacing L and the gas concentration peak time difference t2:

[0107]

[0108] Among them, V 2 Can be used to indicate a second wind speed.

[0109] As an optional embodiment, determining the target air leakage area based on the difference between the first wind speed and the second wind speed includes: in response to the difference exceeding the difference threshold, determining the target air leakage area based on the second measuring point.

[0110] In this embodiment, in the process of determining the target air leakage area based on the difference between the first wind speed and the second wind speed, when the difference exceeds the difference threshold, the target air leakage area can be determined based on the second measuring point.

[0111] Optionally, by comparing the difference between V1 and V2, ΔV=|V 1 -V 2|. If the ventilation inside the goaf is uniform, the wind speed in each section should be similar; however, in areas with severe air leakage, the difference in wind speed will increase significantly.

[0112] Alternatively, when ΔV is large, it indicates that there is a significant acceleration or deceleration of the gas between C1 and C2 or C2 and C3, which is usually related to the air leakage area. Acceleration may mean that the gas passes through the cracks between the goaf and the outside world, and deceleration may be because the gas enters the porous coal seam or rock layer and encounters resistance. Therefore, ΔV is positively correlated with the degree of air leakage. The larger ΔV is, the more serious the air leakage in the area is.

[0113] Optionally, after identifying the target air leakage area, the foam injection strategy can be adjusted to increase the amount and frequency of foam injection to more effectively block the air leakage channel, reduce the oxygen exchange between the goaf and the outside world, and reduce the risk of coal spontaneous combustion.

[0114] In an embodiment of the present invention, by deploying multiple measuring points in the goaf and monitoring the time difference of the peak value of gas concentration, the area with large wind speed changes, that is, the location with serious air leakage, can be more accurately identified. As the working face advances, the location and range of the air leakage area may change. The above-mentioned embodiment can dynamically monitor the air leakage situation and quickly adjust the foam injection strategy to adapt to the changing mining environment. Accurately identifying the air leakage area helps to accurately inject foam into the location where the leak needs to be plugged, reducing unnecessary foam consumption and improving the efficiency and effectiveness of fire prevention and extinguishing measures. Timely plugging the air leakage channel in the goaf can effectively control the oxygen concentration in the goaf, reduce the risk of spontaneous combustion of coal, and ensure the safe production of the mine and the life safety of the operators. In summary, by deploying gas release points and measuring points in the goaf, monitoring the time difference of the peak value of gas concentration, calculating the wind speed and analyzing the wind speed difference, the target air leakage area can be dynamically identified and determined, providing accurate positioning and real-time response capabilities for the application of foam injection plugging air leakage technology, and effectively improving the level of mine fire prevention and ventilation management.

[0115] Optionally, in order to distinguish between normal wind speed changes and abnormal wind speed changes caused by air leakage, a difference threshold needs to be set. The setting of the above difference threshold is based on parameters such as the ventilation conditions, mining depth and geological structure of the mine, as well as previous empirical data. If the calculated difference ΔV exceeds the set difference threshold, it can be inferred that there is a serious air leakage in the goaf area where the second measuring point C2 is located. This is because when the gas passes through the air leakage channel, its speed will change significantly due to the differences in the size, shape and internal resistance of the channel, and this change is reflected in the wind speed difference.

[0116] Optionally, the second measuring point C2 not only serves as a bridge for calculating the first wind speed and the second wind speed, but also because it is located in the center of the two measuring point sections, it can more accurately indicate the wind speed change point, that is, the potential location of the air leakage channel, relative to C1 and C3. When the wind speed difference ΔV exceeds the threshold, it can be considered that the area where the second measuring point C2 is located is the location where the gas flow velocity changes significantly, that is, the target air leakage area. This usually means that there are one or more air leakage channels near C2, and measures need to be taken to block them. The determination of the air leakage area helps to optimize the selection of foam injection points and ensure that the foam can directly and effectively block the air leakage channel. Constructing a foam injection hole near the second measuring point C2 can improve the pertinence and efficiency of foam injection. After the foam is injected, it is necessary to continuously monitor the wind speed changes in the area to ensure that the air leakage channel has been effectively blocked. If the air leakage phenomenon still exists, it may be necessary to adjust the foam injection strategy or add more injection points.

[0117] As an optional embodiment, the air leakage channel includes an external air leakage channel and an internal air leakage channel, and the foam injection hole includes a high-position foam injection hole and a low-position foam injection hole. The high-position foam injection hole is used to block the external air leakage channel between the goaf and the external environment, and the low-position foam injection hole is used to block the internal air leakage channel between the goaf and the working surface. In step S108, the foam injection pipe is extended into the target air leakage area through the foam injection hole to block the air leakage channel between the goaf and the external environment of the mine, as well as the air leakage channel between the working surface of the goaf, including: extending the foam injection pipe into the target air leakage area through the high-position foam injection hole, and controlling the foam injection pipe to inject foam into the target air leakage area to block the external air leakage channel; extending the foam injection pipe into the target air leakage area through the low-position foam injection hole, and controlling the foam injection pipe to inject foam into the target air leakage area to block the internal air leakage channel.

[0118] In this embodiment, the foam injection pipe can be extended into the target air leakage area through the high-position foam injection hole, and the foam injection pipe can be controlled to inject foam into the target air leakage area to block the external air leakage channel. The foam injection pipe can be extended into the target air leakage area through the low-position foam injection hole, and the foam injection pipe can be controlled to input foam into the target air leakage area to block the internal air leakage channel. Wherein, the air leakage channel can include an external air leakage channel and an internal air leakage channel. The foam injection holes can include a high-position foam injection hole (a high-position fixed-point foam injection hole) and a low-position foam injection hole (a low-position fixed-point foam injection hole). The high-position foam injection hole is used to block the external air leakage channel between the goaf and the external environment. The low-position foam injection hole is used to block the internal air leakage channel between the goaf and the working face.

[0119] Alternatively, in coal mining and fire prevention and extinguishing technology, foam injection is an effective means for blocking air leakage channels inside and outside the goaf, reducing oxygen supply, and thus preventing coal from spontaneous combustion. The above method describes how to block external air leakage channels and internal air leakage channels respectively through high-position and low-position foam injection holes.

[0120] Optionally, through monitoring and calculation, the air leakage channels between the goaf and the external environment, i.e., the external air leakage channels, are determined. These channels are usually cracks in the ground and overlying rock strata caused by mining, allowing air (oxygen) to enter the goaf, increasing the risk of coal spontaneous combustion. Based on the theoretical calculation formula of the caving zone and actual measurements, the construction position of the high-level foam injection hole is determined. These holes are usually located above the triangular area of ​​the caving zone, which can effectively block the connection between the goaf and the outside world. The foam injection pipe is extended into the target air leakage area through the high-level foam injection hole, the foam generation system is turned on, and the foam injection pipe is controlled to inject foam into the target area. The foam is filled in the holes and cracks to form an airtight barrier, effectively blocking the external air leakage channels. By arranging measurement points in the goaf and monitoring the changes in gas concentration and wind speed, the air leakage channels between the goaf and the working face, i.e., the internal air leakage channels, are determined. The existence of these channels allows fresh air from the working face to enter the goaf and provide oxygen for coal spontaneous combustion.

[0121] Optionally, low-position foam injection holes are located according to the coal pillar spacing between the working face and the adjacent tunnels and the theoretical position of the triangular zone of the goaf. These holes are close to the corners on both sides of the working face, which can effectively block the air leakage channel between the working face and the goaf. The foam injection pipe is extended into the target air leakage area through the low-position foam injection hole, the foam generation system is started, and the foam injection pipe is controlled to inject foam into the target area. The low-position injected foam can better fill and seal the connection between the working face and the goaf, reducing the influx of oxygen.

[0122] In the embodiment of the present invention, through the combined use of high-position and low-position foam injection holes, the comprehensive blocking of the internal and external air leakage channels in the goaf is achieved, the oxygen concentration in the goaf is effectively reduced, and the risk of coal spontaneous combustion is reduced. The high-position foam injection holes and the low-position foam injection holes are designed for different types of air leakage channels, which can more accurately block air leakage and avoid ineffective foam consumption. The position of the foam injection holes can be flexibly adjusted according to the monitoring results and the progress of the working face to ensure that the foam is injected in the most needed area, thereby improving the flexibility and efficiency of fire prevention and extinguishing measures. Accurately blocking the air leakage channels reduces the unnecessary use of foam, reduces the cost of fire prevention and extinguishing, and also prevents the waste of resources. Effectively blocking the internal and external air leakage channels reduces the oxygen concentration in the goaf, reduces the risk of coal spontaneous combustion, and ensures the safe production of the mine and the life safety of the operators.

[0123] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0124] At present, the working face of shallow deep coal seams is more likely to produce cracks connected to the ground due to the influence of mining during the mining process, which leads to increased air leakage and oxygen supply in the goaf and increased hidden dangers of spontaneous combustion of coal residue. Spontaneous combustion in the goaf of mines is an endogenous fire. When mining coal seams with a tendency to spontaneous combustion, there are many coal residues in the goaf and they are in a broken and piled state. Under the condition of continuous air leakage and oxygen supply, the heat of the coal residues continues to accumulate, which is very easy to cause spontaneous combustion, threatening the safety production of mines and the life and health of operators to a great extent. For shallow deep coal seams, due to the small thickness of the overlying rock layer, it is easier for the goaf and the surface to form connected cracks under the influence of mining. Therefore, plugging the air leakage in the goaf of shallow deep coal seams is of great significance to ensure the safety production of mines and the safety of personnel. How to efficiently plug the air leakage in the goaf of shallow deep coal seams has become a key technical problem. At the same time, there are still many deficiencies in the rapid advancement of the working face and how to quickly follow up the technology of plugging the air leakage in the corresponding goaf. Therefore, there is still a technical problem that the leak channel in the mine cannot be effectively blocked.

[0125] The embodiment of the present invention proposes a method for plugging air leakage by foam injection at the vertex of the triangular belt of the goaf in the tunnel-adjacent drilling type. The method realizes effective plugging of the air leakage channel in the goaf of the mine through vertical profile analysis of the rock formation, calculation of the height of the caving belt, angle design of the foam injection hole and fixed-point foam injection strategy. By obtaining the vertical profile image of the rock formation in the mine, the type and distribution of the rock formation at different depths can be intuitively understood. Through the vertical profile image, the height of the caving belt corresponding to different rock formation types can be accurately calculated, ensuring the fixed point and pertinence of the subsequent foam injection, and improving the reliability of the plugging effect. Based on the height information of the caving belt and the distance between the working face and the tunnel, the angle of the foam injection hole is scientifically determined to ensure that the foam can be accurately injected into the caving belt area to plug the air leakage channel between the goaf and the outside world. The reasonable design of the angle is the key to the effective diffusion and coverage of the foam, which can maximize the plugging efficiency of the foam and reduce unnecessary foam consumption. The target air leakage area in the goaf is determined through the mine ventilation monitoring system. By directly extending the foam injection pipe into the above-mentioned target air leakage area, targeted blocking can be carried out, avoiding blind operation and improving the efficiency of fire prevention and extinguishing measures. Through low-level fixed-point injection of foam, the air leakage channel between the working face and the goaf can be further blocked, reducing the oxygen supply and effectively preventing the spontaneous combustion of coal. The spontaneous combustion of coal in the goaf is usually related to the supply of oxygen, and oxygen mainly enters through the caving zone and the air leakage channel between the working face and the goaf. Thereby achieving the technical effect of effectively blocking the air leakage channel in the mine, solving the technical problem of being unable to effectively block the air leakage channel in the mine.

[0126] The embodiments of the present invention are further described below.

[0127] In an embodiment of the present invention, Figure 2 Schematic diagram of the overall implementation structure of a device for plugging air leakage at the vertex of a triangular belt of a tunnel-type goaf according to an embodiment of the present invention, as shown in FIG. Figure 2 As shown, it may include an adjacent tunnel 1, a protective coal pillar 2, a connecting tunnel 3, a foam high-position injection borehole 4, a foam low-position injection borehole 5, a working face hydraulic support 6, a return air tunnel 7, an air intake tunnel 8, a foam liquid tank 9, a foam generation system 10, a tunnel water pipe 11 and a tunnel compressed air pipeline 12.

[0128] Figure 3 Schematic diagram of a foam fixed-point injection triangular zone of a goaf according to an embodiment of the present invention, such as Figure 3 As shown, it may include: a fracture zone 13, a goaf area 14, a goaf area triangular zone 15 and a caving zone triangular zone 25.

[0129] Figure 4 Schematic diagram of a foam injection method for plugging air leakage in a goaf according to an embodiment of the present invention. Figure 4 As shown, it may include: a power device 16, a foam proportion mixing device 17, a gas-liquid mixing device 18, a foam injection pipeline 19 and a goaf 20. The tunnel water pipe 11 is connected to the foam proportion mixing device 17 through the power device 16, the foam liquid tank 9 is connected to the foam proportion mixing device 17, and the gas-liquid mixing device 18 is connected to the foam proportion mixing device 17 and generates foam through the wind pressure in the tunnel pressure air pipeline 12. Figure 5 Schematic diagram of the plugging effect of foam injection into goaf according to an embodiment of the present invention. Figure 5 As shown, the tunnel water pipe 11 is arranged on one side of the tunnel 1 wall, and quick connectors are arranged at equal distances on the tunnel water pipe 11. The tunnel compressed air pipeline 12 is arranged on one side of the tunnel 1 wall, and quick connectors are arranged at equal distances on the tunnel compressed air pipeline 12. The foam proportion mixing device 17 is based on the principle of jet negative pressure suction. The high-pressure water flow forms a negative pressure in the pipeline to suck the foam agent and mix it with water. The pressure in the tunnel compressed air pipeline 12 can provide power for the gas-liquid mixing device 18. The power device 16 provides overall power for the foam to be injected into the loose medium of the goaf 14.

[0130] In this embodiment, the height of the caving zone of the goaf 14 is calculated, and the height range of the caving zone is calculated according to the mine stratum lithology column chart and the caving zone theoretical calculation formula. The calculation formula is as follows:

[0131] Hard fall zone height range:

[0132] Medium hard fall zone height range:

[0133]

[0134] Among them, H m It can be used to indicate the height range of the caving zone; M can be used to indicate the total thickness of the rock layer in the mine.

[0135] Optionally, during the drilling construction of the adjacent tunnel 1, the spacing l between the protective coal pillar 2 between the working face and the adjacent tunnel 1 is determined according to the connecting tunnel 3, and the construction angle of the foam injection drilling 4 is determined. The drilling construction is completed when the drilling construction reaches the position of the triangular belt 15 in the goaf. The position of the triangular belt 15 in the goaf is the spatial position of the original tunnel 5 of the original working face. The drilling construction position is 1.5m away from the tunnel floor. The calculation formula is:

[0136]

[0137] Among them, θ can be used to represent angle information; l can be used to represent the distance between the foam injection hole and the target tunnel.

[0138] Optionally, for air leakage detection, quantitative release of SF6 is performed at a distance of 50 m from the working face in the air inlet tunnel, and measuring points are arranged at equal distances from the working face to monitor concentration changes in real time. The wind speed is calculated based on the time difference between the arrival of the concentration peaks monitored by two adjacent measuring points. The air leakage between the equally spaced measuring points in the goaf behind the working face is quickly determined based on the changes in wind speed. If the speed changes between the measuring points are large, the air leakage is serious.

[0139] Optionally, Figure 6 is a schematic diagram of an air leakage monitoring calculation method according to an embodiment of the present invention, such as Figure 6 As shown, the air leakage detection includes the SF6 release point, the first measuring point C1, the second measuring point C2, and the third measuring point C3. The measuring points are equidistant from each other by L. The time difference between the peak concentrations of the first measuring point C1 and the second measuring point C2 is t1, and the time difference between the peak concentrations of the second measuring point C2 and the third measuring point C3 is t2. Then the wind speed between the first measuring point C1 and the second measuring point C2 is: Then the wind speed between the second measuring point C2 and the third measuring point C3 is: The severity of the air leakage can be determined by comparing the difference between V1 and V2. If the difference is large, the air leakage is serious, otherwise, it is small.

[0140] Optionally, the foam is injected into the goaf 14 at a fixed point, and the foam injection pipe is extended into the goaf 14 through the foam injection borehole 4 of the adjacent lane 1, and the foam generation system 10 is started to inject foam into the loose medium of the goaf 14 to block the air leakage. The goaf triangular zone 15 existing in the original lane of the working face of the caving zone of the goaf 14 is filled with foam, which can reduce the air leakage of the air inlet lane 8 and the return air lane 7 to the goaf 14, further reduce the air leakage between the goaf and the fissure zone 13, and effectively reduce the risk of spontaneous combustion of coal residues in the goaf.

[0141] Figure 7 Schematic diagram of a foam proportion mixing device structure according to an embodiment of the present invention. Figure 7 As shown, the foam proportion mixing device 17 includes a jet nozzle 21 , a throat section 22 , a diffusion section 23 and a liquid suction pipeline 24 .

[0142] According to an embodiment of the present invention, a device for plugging an air leakage channel in a mine is also provided. It should be noted that the device for plugging an air leakage channel in a mine can be used to execute the method for plugging an air leakage channel in a mine in the above embodiment.

[0143] Figure 8 Schematic diagram of a device for plugging an air leakage channel in a mine according to an embodiment of the present invention. Figure 3 As shown, the blocking device 800 for the air leakage channel in the mine may include: an acquisition unit 802 , a first determination unit 804 , a second determination unit 806 and a blocking unit 808 .

[0144] The acquisition unit 802 is used to acquire a vertical cross-sectional image of a rock layer in a mine.

[0145] The first determination unit 804 is used to determine the height information of the caving zones corresponding to different types of rock formations based on the vertical profile image.

[0146] The second determination unit 806 is used to determine the angle information of the foam injection hole in the mine based on the height information and the distance information between the working face of the mine and the tunnel in the mine.

[0147] The plugging unit 808 is used to determine the target air leakage area of ​​the goaf in the mine, and according to the angle information, extend the foam injection pipe into the target air leakage area through the foam injection hole to plug the air leakage channel between the goaf and the external environment of the mine, as well as the air leakage channel between the goaf and the working face.

[0148] In the embodiment of the present invention, the vertical profile image of the rock layer in the mine is obtained by the acquisition unit 802; the height information of the caving zone corresponding to different types of rock layers is determined by the first determination unit 804 based on the vertical profile image; the angle information of the foam injection hole in the mine is determined by the second determination unit 806 based on the height information and the distance information between the working face of the mine and the tunnel in the mine; the target air leakage area of ​​the goaf in the mine is determined by the blocking unit 808, and the foam injection pipe is extended into the target air leakage area through the foam injection hole according to the angle information to block the air leakage channel between the goaf and the external environment of the mine, and the air leakage channel between the goaf and the working face. Thus, the technical effect of effectively blocking the air leakage channel in the mine is achieved, and the technical problem of being unable to effectively block the air leakage channel in the mine is solved.

[0149] According to an embodiment of the present invention, a blocking system for an air leakage channel in a mine is also provided. Fig. 9Schematic diagram of a plugging system for an air leakage channel in a mine according to an embodiment of the present invention. Fig. 9 As shown, the sealing system 900 for the air leakage channel in the mine may include: a foam proportioning mixing device 902, a gas-liquid mixing device 904, a foam delivery pipeline 906, a high-position foam injection hole 908, a low-position foam injection hole 910 and a power device 912.

[0150] The foam proportion mixing device 902 is used to mix the foaming agent with water to generate foam. The gas-liquid mixing device 904 is connected to the foam proportion mixing device and is used to mix the foam with the compressed air to form a foam delivery flow. The foam delivery pipeline 906 is connected to the gas-liquid mixing device and is used to deliver the foam delivery flow to the high-position foam injection hole and the low-position foam injection hole in the mine in response to the existence of the target air leakage area in the goaf in the mine. The high-position foam injection hole 908 is used to inject the foam delivery flow into the target air leakage area to block the air leakage channel between the goaf and the external environment of the mine. The low-position foam injection hole 910 is used to inject the foam delivery flow into the target air leakage area to block the air leakage channel between the goaf and the working surface in the mine. The power device 912 is connected to the foam proportion mixing device and is used to provide power to the foam proportion mixing device and the gas-liquid mixing device. Thereby, the technical effect of effectively blocking the air leakage channel in the mine is achieved, and the technical problem of being unable to effectively block the air leakage channel in the mine is solved.

[0151] According to an embodiment of the present invention, a computer-readable storage medium is further provided, the storage medium comprising a stored program, wherein the program executes the method for blocking an air leakage channel in a mine in the above embodiment.

[0152] According to an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein when the program is run, the method for blocking an air leakage channel in a mine in the above embodiment is executed.

[0153] The embodiment of the present application further provides a computer program product. Optionally, in the present embodiment, the computer program product may include a computer program, and when the computer program is executed by a processor, the method for blocking an air leakage channel in a mine of the embodiment of the present application is implemented.

[0154] In several embodiments provided in the present application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple units. Some or all of the units can be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0155] In addition, each functional unit in each embodiment of the present invention can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), mobile hard disk, disk or optical disk and other media that can store program code.

[0156] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for blocking an air leakage channel in a mine, characterized in that: include: Acquire a vertical cross-sectional image of a rock layer in a mine, wherein the vertical cross-sectional image is used to represent the distribution of different types of rock layers at different depths in the mine; Based on the vertical section image, respectively determine the height information of the caving zones corresponding to the rock formations of different types, wherein the caving zones are areas of the rock formations in an abnormal state; Based on the height information and the distance information between the working face of the mine and the tunnel in the mine, determining the angle information of the foam injection hole in the mine, wherein the working face is the area in the mine where the mining operation task is being performed; Determine a target air leakage area of ​​the goaf in the mine, and according to the angle information, extend the foam injection pipe into the target air leakage area through the foam injection hole to block the air leakage channel between the goaf and the external environment of the mine, and the air leakage channel between the goaf and the working face, wherein the goaf is an area in the mine where the mining operation has been performed, and the air leakage level in the goaf in the target air leakage area is higher than the air leakage level threshold.

2. The method according to claim 1, characterized in that Based on the vertical section image, the height information of the caving zones corresponding to the rock formations of different types is determined respectively, including: Determining hardness levels of the rock formations of different types from the vertical cross-sectional images; The height information of the caving zone corresponding to different hardness grades is determined respectively.

3. The method according to claim 2, characterized in that The hardness level includes a first hardness level, a second hardness level, a third hardness level and a fourth hardness level, the hardness of the rock formation of the first hardness level is greater than the hardness of the rock formation of the second hardness level, the hardness of the rock formation of the third hardness level is greater than the hardness of the rock formation of the fourth hardness level, and the hardness of the rock formation of the second hardness level is greater than the hardness of the rock formation of the third hardness level, wherein respectively determining the height information of the caving zone corresponding to different hardness levels includes: Based on the total thickness of the rock strata in the mine, the height information of the caving zone corresponding to different hardness levels is determined respectively.

4. The method according to claim 1, characterized in that: The method further comprises: From the lanes, determining a target lane adjacent to the working face; The distance information between the target tunnel and the working surface is determined.

5. The method according to claim 4, characterized in that Based on the height information and the distance information between the working face of the mine and the tunnel in the mine, determining the angle information of the foam injection hole in the mine includes: The angle information is determined based on the distance between the foam injection hole and the target lane, and the distance information.

6. The method according to claim 1, characterized in that Determining the target air leakage area of ​​the goaf in the mine, including: Deploy a gas release point, a first measuring point, a second measuring point and a third measuring point in the goaf, wherein the distance between the first measuring point and the second measuring point is the same as the distance between the second measuring point and the third measuring point; releasing the target gas at the gas release point, and detecting the gas concentrations at the first measuring point, the second measuring point, and the third measuring point; Based on the gas concentration, determining a first gas concentration peak time difference between the first measuring point and the second measuring point, and a second gas concentration peak time difference between the second measuring point and the third measuring point; Determine a first wind speed between the first measuring point and the second measuring point based on the distance and the time difference of the first gas concentration peak, and determine a second wind speed between the second measuring point and the third measuring point based on the distance and the time difference of the second gas concentration peak; The target air leakage area is determined based on a difference between the first wind speed and the second wind speed, wherein the difference is positively correlated with the degree of air leakage.

7. The method according to claim 6, characterized in that Determining the target air leakage area based on the difference between the first wind speed and the second wind speed includes: In response to the difference exceeding a difference threshold, the target air leakage area is determined based on the second measuring point.

8. The method according to any one of claims 1 to 7, characterized in that The air leakage channel includes an external air leakage channel and an internal air leakage channel, and the foam injection hole includes a high-position foam injection hole and a low-position foam injection hole. The high-position foam injection hole is used to block the external air leakage channel between the goaf and the external environment, and the low-position foam injection hole is used to block the internal air leakage channel between the goaf and the working surface, wherein, according to the angle information, the foam injection pipe is extended into the target air leakage area through the foam injection hole to block the air leakage channel between the goaf and the external environment of the mine, and the air leakage channel between the goaf and the working surface, including: Extending the foam injection pipe into the target air leakage area through the high-position foam injection hole, and controlling the foam injection pipe to inject foam into the target air leakage area to block the external air leakage channel; The foam injection pipe is extended into the target air leakage area through the low-position foam injection hole, and the foam injection pipe is controlled to inject the foam into the target air leakage area to block the internal air leakage channel.

9. A device for indicating rock stress in a mine, characterized in that: include: An acquisition unit, used for acquiring a vertical cross-sectional image of a rock layer in a mine, wherein the vertical cross-sectional image is used for representing the distribution of different types of rock layers at different depths in the mine; A first determining unit is used to determine, based on the vertical profile image, the height information of the caving zones corresponding to the rock formations of different types, respectively, wherein the caving zone is a region of the rock formation in an abnormal state above the working face of the mine, and the working face is a region in the mine where mining operations are being performed; a second determining unit, configured to determine angle information of the foam injection hole in the mine based on the height information and distance information between the working face of the mine and the tunnel in the mine, wherein the working face is an area in the mine where mining operations are being performed; A plugging unit is used to determine a target air leakage area in a goaf in the mine, and according to the angle information, extend a foam injection pipe into the target air leakage area through the foam injection hole to block the air leakage channel between the goaf and the external environment of the mine, and the air leakage channel between the working faces in the goaf, wherein the goaf is an area in the mine where the mining operation has been performed, and the air leakage level in the goaf in the target air leakage area is higher than a leakage level threshold.

10. A plugging system for air leakage channels in mines, characterized in that: include: A foam proportioning device for mixing a foaming agent with water to generate foam; A gas-liquid mixing device, connected to the foam proportioning mixing device, for mixing the foam with the compressed air to form a foam delivery flow; A foam delivery pipeline connected to the gas-liquid mixing device is used to deliver the foam delivery flow to the high-position foam injection hole and the low-position foam injection hole in the mine in response to the existence of a target air leakage area in the goaf of the mine, wherein the goaf is an area in the mine where mining operations have been performed, and the target air leakage area is an area in the goaf where the air leakage level is higher than the air leakage level threshold; The high-position foam injection hole is used to inject the foam delivery flow into the target air leakage area to block the air leakage channel between the goaf and the external environment of the mine; The low-position foam injection hole is used to inject the foam delivery flow into the target air leakage area to block the air leakage channel between the goaf and the working face in the mine, wherein the working face is the area in the mine where the mining operation is being performed, and the angle information of the low-position foam injection hole is determined based on the height information of the caving zone in the mine and the distance information between the working face and the tunnel in the mine, and the height information is determined based on the vertical profile image of the rock formation in the mine, and the vertical profile image is used to represent the distribution status of different types of the rock formation at different depths in the mine, and the caving zone is the area of ​​the rock formation in the mine that is in an abnormal state; A power device is connected to the foam proportioning mixing device and is used to provide power to the foam proportioning mixing device and the gas-liquid mixing device.

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