Full space-time combined prevention and control method for water inrush risk of deep close coal seam group repeated mining

Abstract

This invention provides a comprehensive, all-weather, and all-space joint prevention and control method for water inrush risk during repeated mining in deep, closely spaced coal seams. The method includes: optimizing the working face roadway layout through physical and numerical simulations before mining to form a double-internal staggered layout of cut-in and dip directions, and arranging floor roadways; increasing the thickness of the aquitard layer through regional treatment before mining to reduce the water inrush coefficient; monitoring the temporal, spatial, and intensity information of microseismic events within the mining area during mining and determining the microseismic monitoring and early warning level; observing mine pressure and hydrological information during mining and monitoring their changes, while combining the microseismic monitoring and early warning level with areas of high density of deep events to control the pushing speed and implement fixed-point dynamic drainage and pressure reduction to reduce the working face water inrush coefficient. This invention, through the joint control of mine pressure, water pressure, and microseismic monitoring and early warning methods, spans the entire period before and during mining, effectively reducing the risk of water inrush and ensuring safe mining of the working face.

Description

Technical Field

[0001] This invention relates to the fields of coal seam technology and coal mine water hazard prevention, and in particular to a method for joint prevention and control of water inrush risk during repeated mining in deep, close-range coal seams in all time and space. Background Technology

[0002] Coal is an important basic energy source in my country, but the occurrence conditions of coal resources vary, and different safety issues are faced during mining. The characteristics of extremely close-proximity coal seams are that the distance between coal seams is short, and the impact of mining adjacent coal seams is significant. Furthermore, the surrounding rock of the roadway is severely deformed due to repeated mining, and the intensity of mine pressure manifestation increases dramatically. This significantly increases the threat of floor water hazards under repeated mining conditions, making water control more difficult and easily causing abnormal fluctuations in mine water inflow during mining, seriously threatening mine production safety.

[0003] Currently, the prevention and control of water hazards in close-range coal seam mining mainly relies on strengthening hydrological observation and combining geophysical drilling to explore abnormal areas. However, dynamic control has not been achieved, and the methods are relatively simple, so the effectiveness in reducing the risk of water inrush needs to be improved. Summary of the Invention

[0004] This invention provides a method for joint prevention and control of water inrush risk during repeated mining of deep, closely spaced coal seams, in order to address the problem of reducing the risk of water inrush during mining of extremely closely spaced coal seams.

[0005] In a first aspect, embodiments of the present invention provide a method for joint prevention and control of water inrush risk during repeated mining in deep, closely spaced coal seams, including:

[0006] Before mining, the roadway layout scheme of the working face is optimized through physical simulation and numerical simulation to form a double internal staggered layout of cut-in and dip direction, and the bottom roadway is arranged.

[0007] Before mining, the thickness of the aquitard layer is increased through regional treatment to reduce the water inrush coefficient;

[0008] During the mining process, monitor the temporal, spatial, and intensity information of microseismic events within the monitoring area, and determine the microseismic monitoring and early warning level;

[0009] During mining, the mine pressure value and hydrological information are monitored and their changes are observed. At the same time, the mining speed is controlled and dynamic drainage and pressure reduction are carried out in combination with the microseismic monitoring and early warning level and the deep event-intensive area to reduce the water inrush coefficient of the working face.

[0010] In one possible implementation, the roadway layout of the working face is optimized through physical simulation before mining, including:

[0011] A physical simulation model was created based on the scale of the working face and a similar scale, and the components that make up the physical simulation model were selected according to the actual geological data of the mine.

[0012] Based on a physical simulation model, the roof is linearly pressurized by combining the mining advance time and the combined mechanical properties of the roof coal and rock mass. The floor is pressurized by springs to simulate the pressure of the floor water. A set of comparative schemes are compared. Among them, the comparative schemes have the same dip alignment conditions, and the alignment of the cut-eye and the misalignment of the cut-eye are compared.

[0013] In one possible implementation, the roadway layout of the working face is optimized through numerical simulation before mining, including:

[0014] Based on the borehole columnar section of the monitoring working face and the physical and mechanical parameters of the surrounding rock and coal seam, a model of the overburden movement law during coal seam mining based on fluid-structure interaction simulation is established.

[0015] Orthogonal experimental design method was adopted, and three influencing factors were selected: cut eye layout, dip layout, and mining speed. Cut eye alignment, cut eye misalignment, dip alignment, dip protrusion, dip misalignment, slow mining, medium mining, and fast mining were used as simulation factors and levels. Based on the overburden movement law model, the simulation factors and levels were combined and compared.

[0016] In one possible implementation, regional treatment is used to reduce the water pressure at the working face before mining to increase the thickness of the aquitard layer and thus reduce the water inrush coefficient, including:

[0017] Before mining, the thickness of the aquitard layer is increased through regional treatment to control the water inrush coefficient in normal areas to 0.06 MPa / m, and the water inrush coefficient in weak areas is controlled to 0.04 MPa / m through drainage.

[0018] One possible implementation of fixed-point dynamic hydrophobic depressurization includes:

[0019] When the working face is under pressure or the water volume changes more than the preset water volume change threshold, the drainage time of the drainage borehole is controlled by the valve.

[0020] Based on the mining conditions, water is drained in areas with geological structures, dense microseismic deep events, and primary fracture zones.

[0021] The effectiveness of water drainage and pressure reduction is evaluated based on the changes in water level and mine water inflow after the drainage and pressure reduction.

[0022] In one possible implementation, the microseismic monitoring and early warning level is determined, including:

[0023] If the daily amplitude of the bottom plate event is higher than the first preset threshold but lower than the second preset threshold, or if micro-seismic events occur mainly in the relatively water-rich thin limestone layer, the warning level is level four.

[0024] If the daily variation of the bottom plate event exceeds the second preset threshold for two days within 7 days, or if the main relatively water-rich thin-layer limestone event occurs for two days within 7 days, or if the Ordovician limestone event occurs, the warning level will be level three.

[0025] If the daily amplitude of a 5-day floor event exceeds the third preset threshold within 7 days, or if a 5-day main relatively water-rich thin-layer limestone event occurs within 7 days, or if a 3-day Ordovician limestone event occurs within 7 days, or if micro-seismic events on the floor near the mining line occur in a vertically continuous pattern, then the warning level is Level II.

[0026] If a Level II warning is issued for three consecutive days, and the Osmo Gray event occurs for three consecutive days, then the warning level will be Level I.

[0027] Based on microseismic monitoring and early warning levels and areas with high density of deep events, the measures include controlling the drilling speed and implementing targeted dynamic drainage and pressure reduction, as well as:

[0028] The pressure intensity is determined based on the frequency change rate and energy index of microseismic events, and corresponding prevention and control measures are taken. These measures include adjusting support measures, velocity control, and water pressure control.

[0029] In one possible implementation, the drilling speed is controlled, including:

[0030] The mining speed in deep, event-intensive areas should be controlled at 1.2 to 2 times the normal mining speed.

[0031] Secondly, embodiments of the present invention provide a joint prevention and control device for water inrush risk during repeated mining in deep, closely spaced coal seams, comprising:

[0032] The optimization module is used to optimize the working face roadway layout scheme through physical and numerical simulations before mining, forming a cut-in and dip double-internal staggered layout, and to arrange the bottom roadway.

[0033] The treatment module is used to increase the thickness of the aquitard layer through regional treatment before mining, so as to reduce the water inrush coefficient;

[0034] The monitoring module is used to monitor the time, space, and intensity information of microseismic events in the mining area and determine the microseismic monitoring and early warning level.

[0035] The drainage module is used to monitor the mine pressure value and hydrological information during mining and to monitor their changes. At the same time, it combines the microseismic monitoring and early warning level and the dense event area in the deep part to control the mining speed and perform fixed-point dynamic drainage and pressure reduction to reduce the water inrush coefficient of the working face.

[0036] Thirdly, embodiments of the present invention provide a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation thereof.

[0037] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation thereof.

[0038] This invention provides a comprehensive, multi-dimensional method for preventing and controlling water inrush risks during repeated mining in deep, closely spaced coal seams. It utilizes simulated data analysis to determine key parameters such as pressure step distance and floor damage depth, and to design floor roadways for mine pressure control. Water pressure management is achieved through dynamic drainage and pressure reduction measures, as well as regional governance. Furthermore, it analyzes the spatiotemporal evolution of microseismic events based on their frequency and depth, and implements different measures according to early warnings to dynamically manage water drainage or reduce the concentration of mine pressure. This integrated approach, combining mine pressure, water pressure, and microseismic monitoring and early warning, achieves dynamic joint control throughout the entire mining process, from pre-mining to mining, reducing water inrush risks and ensuring safe mining operations. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating the implementation of a method for joint prevention and control of water inrush risk during repeated mining in deep, close-range coal seams, according to an embodiment of the present invention.

[0041] Figure 2 This is a schematic diagram of the structure of a high-precision microseismic monitoring system provided in an embodiment of the present invention;

[0042] Figure 3 This is a technical roadmap for joint prevention and control provided by an embodiment of the present invention;

[0043] Figure 4A This is a schematic diagram of a working face roadway arrangement with eye-aligned and dip-aligned according to an embodiment of the present invention;

[0044] Figure 4B This is a schematic diagram of a working face roadway arrangement with staggered cuts and aligned tendencies, provided in an embodiment of the present invention;

[0045] Figure 5A This is a schematic diagram of the experimental floor slab failure depth provided in an embodiment of the present invention, where the working face roadway is arranged with eyelets aligned.

[0046] Figure 5B This is a schematic diagram of the experimental floor failure depth when the working face roadway is arranged with an in-cut staggered pattern, according to an embodiment of the present invention.

[0047] Figure 6 This is an experimental diagram of a physical simulation test point provided in an embodiment of the present invention;

[0048] Figure 7A This is a schematic diagram of the pressure value for continuous mining provided in an embodiment of the present invention;

[0049] Figure 7B This is a schematic diagram of the pressure values ​​during a 24-day mining stoppage provided in an embodiment of the present invention.

[0050] Figure 8 This is a comparison diagram of the changes in the depth of damage to the base plate at different speeds, provided in an embodiment of the present invention.

[0051] Figure 9A This is a comparison diagram of horizontal displacement with a velocity of 2m / d provided in an embodiment of the present invention;

[0052] Figure 9B This is a comparison diagram of horizontal displacement with a velocity of 4 m / d provided in an embodiment of the present invention;

[0053] Figure 9C This is a comparison diagram of horizontal displacement with a velocity of 8 m / d provided in an embodiment of the present invention;

[0054] Figure 10 This is a bar chart of column I-17-33200 provided in one embodiment of the present invention;

[0055] Figure 11 This is a microseismic event distribution map shown from different perspectives (XY, XZ, YZ) provided in an embodiment of the present invention;

[0056] Figure 12 This is a microseismic monitoring stratigraphic distribution table provided in an embodiment of the present invention;

[0057] Figure 13 This is an example diagram of a daily microseismic monitoring and early warning system provided in an embodiment of the present invention;

[0058] Figure 14 This is a schematic diagram of the process of delineating a dense area of ​​deep events according to an embodiment of the present invention;

[0059] Figure 15 This is a schematic diagram of the structure of a joint prevention and control device for water inrush risk during repeated mining of deep, close-range coal seams provided in an embodiment of the present invention;

[0060] Figure 16 This is a schematic diagram of a terminal provided in an embodiment of the present invention. Detailed Implementation

[0061] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0062] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0063] See Figure 1 The document illustrates a flowchart of the implementation of the all-weather, all-space joint prevention and control method for water inrush risk during repeated mining of deep, closely spaced coal seams provided by an embodiment of the present invention, detailed below:

[0064] Step 101: Before mining, optimize the working face roadway layout scheme through physical simulation and numerical simulation to form a cut-in and dip double-internal staggered layout, and carry out the bottom roadway layout.

[0065] In this embodiment, before mining, when designing the roadways for the working face, different layout schemes are compared through physical simulation and numerical simulation. Important parameters such as step distance and floor failure depth are analyzed using physical and numerical simulation data. After the upper layer is mined, the mining scale of the lower layer is appropriately reduced, and the cutting and internal offsetting of the upper and lower roadways are carried out. This helps to reduce the floor failure depth, and the overlying surrounding rock collapses in a timely manner during mining.

[0066] By strategically arranging bottom roadways, the pressure on the bottom rock mass of the working face can be relieved in advance. The excavation of bottom roadways can appropriately relieve the pressure on the bottom coal and rock mass during mining, especially when coal seams are superimposed, the pressure relief effect is more significant.

[0067] Step 102: Before mining, increase the thickness of the aquitard layer through regional treatment to reduce the water inrush coefficient.

[0068] In this embodiment, the prevention and control of water in the mine floor should follow the principle of combining surface and underground treatment, as well as regional and local treatment. Based on the actual conditions of the mine, water prevention and control measures such as surface regional treatment, underground grouting to reinforce the floor or modifying the aquifer, drainage and pressure reduction, and backfilling mining should be adopted to eliminate the threat of water hazards.

[0069] Furthermore, by organizing the simulation experimental data from step 101, it was found that the internal faulting of the cut can effectively control the depth of the base plate damage and the initial pressure step distance, which can relatively increase the thickness of the effective water-resistant layer and relatively improve the safety of the lower layer mining.

[0070] Step 103: Monitor the time, space, and intensity information of microseismic events in the mining area and determine the microseismic monitoring and early warning level.

[0071] In this embodiment, microseismic events possess multi-dimensional information such as time, space, and intensity. After precise location, the frequency, location, and energy of the seismic source can be intuitively displayed. A high-precision microseismic monitoring system is installed on the working face, such as... Figure 2 As shown, the high-precision microseismic monitoring system includes geophones, monitoring substations, etc., and can acquire events in the study area in real time. Through downhole acquisition and transmission, surface transmission and triggering, data processing and output, a daily microseismic monitoring report is generated.

[0072] Step 104: During mining, observe the mine pressure value and hydrological information, and pay attention to their changes. At the same time, combine the microseismic monitoring and early warning level and the deep event-intensive area to control the mining speed and implement fixed-point dynamic drainage and pressure reduction to reduce the water inrush coefficient of the working face.

[0073] In this embodiment, based on the distribution of events in the main relatively water-rich thin-layered limestone, which can also be called the microseismic monitoring and early warning layer, a dense area of ​​deep events is delineated. This area is the deep fracture development zone. Appropriate measures should be taken to reduce the risk of water inrush 100m before entering this area and during the process of entering this area.

[0074] The collected data is uploaded to a ground server via fiber optic cable, and then undergoes quality control in specialized processing software. Professional mapping software is used to display microseismic events from different perspectives, and the spatiotemporal evolution of these events is analyzed based on indicators such as frequency and depth. Daily microseismic monitoring reports are then issued. When the data in the daily microseismic monitoring report triggers early warning conditions, a corresponding level of warning is issued to the mine. Based on the warning, the mine takes different measures, such as draining water or reducing the concentration of mine pressure, to mitigate the risk of water inrush.

[0075] Meanwhile, when passing through the original damage zone or structurally abnormal area, a uniform and rapid passage is adopted, with the speed generally being 1.2 to 2 times the normal mining speed. After passing through the original damage zone or structurally abnormal area, the normal mining speed is restored, which can avoid the situation of local concentration of ore pressure.

[0076] This invention utilizes simulated data analysis to control key parameters such as step distance and floor damage depth, and to arrange floor roadways accordingly, thereby achieving mine pressure control. Water pressure management is achieved through dynamic drainage and pressure reduction measures, as well as regional governance. Furthermore, by analyzing the spatiotemporal evolution of microseismic events based on their frequency and depth, different measures are taken according to early warnings, including drainage or reducing the concentration of mine pressure. This comprehensive approach, integrating mine pressure, water pressure, and microseismic monitoring and early warning, enables dynamic joint control throughout the entire mining process, from pre-mining to mining operations, reducing the risk of water inrush and ensuring safe mining operations.

[0077] In one possible implementation, the roadway layout of the working face is optimized through physical simulation before mining, including:

[0078] A physical simulation model was created based on the scale of the working face and a similar scale, and the components that make up the physical simulation model were selected according to the actual geological data of the mine.

[0079] Based on a physical simulation model, the roof is linearly pressurized by combining the mining advance time and the combined mechanical properties of the roof coal and rock mass. The floor is pressurized by springs to simulate the pressure of the floor water. A set of comparative schemes are compared. Among them, the comparative schemes have the same dip alignment conditions, and the alignment of the cut-eye and the misalignment of the cut-eye are compared.

[0080] In this embodiment, a physical simulation model is created based on the working face scale and a similar scale. The components of the simulation materials are selected according to the actual geological data of the mine, ensuring that the model and the actual entity satisfy geometric, temporal, and mechanical similarity. The comparison scheme involves consistent dip alignment conditions, and comparisons are made regarding cut-eye alignment and internal misalignment. In the physical simulation, the roof of the similar model uses a linear pressurization method, with varying pressure intensity as mining progresses. Simultaneously, considering the differences in the mechanical properties of the roof coal-rock combination, different degrees of pressurization are applied. The floor uses spring pressurization to simulate the pressure of the floor's confined water, making the simulation results closer to actual mining conditions.

[0081] In one possible implementation, the roadway layout of the working face is optimized through numerical simulation before mining, including:

[0082] Based on the borehole columnar section of the monitoring working face and the physical and mechanical parameters of the surrounding rock and coal seam, a model of the overburden movement law during coal seam mining based on fluid-structure interaction simulation is established.

[0083] Orthogonal experimental design method was adopted, and three influencing factors were selected: cut eye layout, dip layout, and mining speed. Cut eye alignment, cut eye misalignment, dip alignment, dip protrusion, dip misalignment, slow mining, medium mining, and fast mining were used as simulation factors and levels. Based on the overburden movement law model, the simulation factors and levels were combined and compared.

[0084] In this embodiment, the numerical simulation refers to the borehole columnar section of the monitored working face, the physical and mechanical parameters of the surrounding rock and coal seam, and establishes a model of the movement law of the overlying (buried) rock during the coal seam mining process. Generally, the following boundary conditions are adopted: the left and right boundaries are fixed with horizontal displacement, the bottom boundary is fixed with vertical displacement, and the top is a free boundary.

[0085] The numerical simulation employed a fluid-structure interaction approach, utilizing orthogonal experimental design to identify factors related to roadway layout optimization and mining. An orthogonal array was selected based on influencing factors and the number of levels, incorporating factors such as eye alignment, eye offset, dip alignment, dip protrusion, dip offset, slow mining, medium mining, and fast mining to form specific experimental schemes. The results of each group of comparative experiments were recorded, and the contribution coefficient and range of each influencing factor were calculated to determine the optimal combination. The correspondence between simulation factors and levels is shown in Table 1.

[0086] Table 1

[0087]

[0088] In one possible implementation, the thickness of the aquitard is increased through regional treatment before extraction to reduce the water inrush coefficient, including:

[0089] Before mining, the thickness of the aquitard layer is increased through regional treatment to control the water inrush coefficient in normal areas to 0.06 MPa / m, and the water inrush coefficient in weak areas is controlled to 0.04 MPa / m through drainage.

[0090] In this embodiment, the calculation formula for the water inrush coefficient in Appendix 5 of the "Detailed Rules for Water Prevention and Control in Coal Mines" is applied to coal mining faces. Based on national data, the water inrush coefficient in areas with structural damage to the floor should generally not exceed 0.06 MPa / m, and in areas with intact aquitards and no structural damage, it should not exceed 0.1 MPa / m. The calculation formula for the water inrush coefficient is as follows:

[0091]

[0092] Wherein, T is the water inrush coefficient, MPa / m; P is the actual water head value borne by the bottom aquifer, MPa; the water pressure should be calculated from the top interface of the aquifer, and the water level value is the highest observed water level of the aquifer in the past 3 years; M is the thickness of the bottom aquifer, m.

[0093] In this embodiment, water pressure is reduced by dynamic drainage and regional management to increase the thickness of the waterproof layer, thereby reducing the inrush coefficient and achieving strict management of water pressure at the working face. This ensures that the water pressure in normal areas is controlled at 0.06 MPa / m, and in vulnerable areas, it is controlled at 0.04 MPa / m through drainage, thus guaranteeing safe production at the working face.

[0094] One possible implementation of fixed-point dynamic hydrophobic depressurization includes:

[0095] When the working face is under pressure or the water volume changes more than the preset water volume change threshold, the drainage time of the drainage borehole is controlled by the valve.

[0096] Based on the mining conditions, water is drained in areas with geological structures, dense microseismic deep events, and primary fracture zones.

[0097] The effectiveness of water drainage and pressure reduction is evaluated based on the changes in water level and mine water inflow after the drainage and pressure reduction.

[0098] In this embodiment, the main measure for water pressure control is fixed-point dynamic drainage. When the water inrush coefficient of the floor is higher than 0.06 MPa / m during mining, or when passing through weak areas such as structural features or original damage zones, water drainage and pressure reduction are carried out on the deep high-pressure aquifers of the coal seam floor. Under the condition of reducing the water head pressure, water-pressure mining is carried out. Drainage boreholes directly enter the water-bearing rock strata (body) that need to be drained to disperse or locally drain water, reduce the water pressure value, and thus reduce the water inrush coefficient.

[0099] Water drainage and pressure reduction is a dynamic control method. ① When the working face is under pressure or the water volume changes significantly, the drainage time is controlled by valves to achieve dynamic control in time. ② Drainage can be carried out reasonably according to mining conditions. Common locations include areas with geological structures, areas with dense microseismic deep events, and primary fracture zones, which can achieve dynamic control in location.

[0100] During the process of draining water, it is important to match the appropriate mine drainage system, improve drainage capacity, and ensure the drainage capacity of deep, thick limestone.

[0101] In this embodiment, an automatic water level monitoring system is established to monitor changes in water level and mine water inflow in real time after dewatering and depressurization, thereby evaluating the effectiveness of dewatering and depressurization. The automatic water level monitoring system includes hydrological sensors, monitoring stations, transmission equipment, a server, and a water hazard risk early warning information display platform. Its main establishment steps are as follows: Select suitable monitoring points within the coal mine area, install water level and water volume sensors, transmit data to the server via network, and upload water level and water volume data to the monitoring platform every 4 hours. The monitoring platform allows for real-time and cumulative value queries and displays. When the water level and water volume data on the platform reach the warning value, the platform will issue a warning notification and push it to relevant personnel via mobile phone, prompting timely opening of the drainage valve for drainage.

[0102] In one possible implementation, the microseismic monitoring and early warning level is determined, including:

[0103] If the daily amplitude of the bottom plate event is higher than the first preset threshold but lower than the second preset threshold, or if micro-seismic events occur mainly in the relatively water-rich thin limestone layer, the warning level is level four.

[0104] If the daily variation of the bottom plate event exceeds the second preset threshold for two days within 7 days, or if the main relatively water-rich thin-layer limestone event occurs for two days within 7 days, or if the Ordovician limestone event occurs, the warning level will be level three.

[0105] If the daily amplitude of a 5-day floor event exceeds the third preset threshold within 7 days, or if a 5-day main relatively water-rich thin-layer limestone event occurs within 7 days, or if a 3-day Ordovician limestone event occurs within 7 days, or if micro-seismic events on the floor near the mining line occur in a vertically continuous pattern, then the warning level is Level II.

[0106] If a Level II warning is issued for three consecutive days, and the Osmo Gray event occurs for three consecutive days, then the warning level will be Level I.

[0107] Based on microseismic monitoring and early warning levels and areas with high density of deep events, the measures include controlling the drilling speed and implementing targeted dynamic drainage and pressure reduction, as well as:

[0108] The pressure intensity is determined based on the frequency change rate and energy index of microseismic events, and corresponding prevention and control measures are taken. These measures include support measures, velocity control, and water pressure control.

[0109] In this embodiment, the specific microseismic monitoring and early warning triggering conditions are shown in Table 2.

[0110] Table 2

[0111]

[0112]

[0113] Combining microseismic analysis with pressure assessment and mine pressure control, the parameters used include:

[0114] Parameter 1: Rate of change of microseismic event frequency

[0115]

[0116] In the formula, N n N represents the number of microseismic events that day. n-1 This represents the number of microseismic events from the previous day, expressed in units.

[0117] Parameter 2: Energy Index (EI)

[0118] The energy index can be used to describe the degree of damage to the rock mass when a microseismic event occurs. The actual situation of the working face is shown in formula (2).

[0119]

[0120] In the formula, Ep represents the energy of a microseismic event within a single day, measured in J. The average energy value of microseismic events during the monitoring period is expressed in J.

[0121] The pressure intensity corresponding to the microseismic event can be determined based on the parameters f and EI. Corresponding measures can be taken according to different pressure intensities, including support measures and velocity control. At the same time, water pressure control measures can be appropriately supplemented by combining hydrological information.

[0122] In one possible implementation, the drilling speed is controlled, including:

[0123] The mining speed in deep, event-intensive areas should be controlled at 1.2 to 2 times the normal mining speed.

[0124] In this embodiment, the changes in pressure values ​​at different mining speeds are statistically analyzed through on-site microseismic data, and the impact of temporary shutdown and restart of mining on the working face is simulated. During mining, hydrological changes, microseismic monitoring, and mine pressure support values ​​are combined.

[0125] As can be seen from the above, this invention reduces the risk of water inrush by employing methods such as double-staggered arrangement of the lower-level roadway cut-off and dip direction, excavation of the floor roadway, pre-mining grouting reinforcement, and water drainage before repeated mining of the extremely close-range coal seam. During mining, it further reduces the water inrush coefficient of the working face by combining real-time microseismic monitoring and early warning, speed control in areas with high density of deep events, and water drainage. Through the combined control of water pressure, mine pressure, and microseismic monitoring and early warning methods, throughout the entire period before and during mining, the water inrush coefficient in normal sections is kept below 0.06 MPa / m, and in weak areas such as structural sections below 0.04 MPa / m, ensuring safe mining of the working face.

[0126] In a specific embodiment, the Pingmei No. 10 Mine is used as an example to illustrate the specific implementation of the present invention. The geological conditions of the Pingmei No. 10 Mine include deep burial, high water pressure, and high water temperature, resulting in high tectonic stress, severe mine pressure manifestation, significant heat hazard threat, and serious water inrush threat. The technical roadmap for comprehensive control is as follows: Figure 3 As shown, the details are as follows:

[0127] 1. Mine pressure control

[0128] (1) Layout of working face roadways

[0129] ①Physical simulation

[0130] Physical simulation experiments offer advantages such as high intuitiveness, flexibility, and repeatability, vividly depicting the deformation and fracturing process of the coal seam roof and floor under mining influence. Based on the specific conditions of Pingmei Ji 17-33200, simulations were conducted to examine the alignment and internal misalignment of the cut-off face, the failure patterns of the roof and floor under the combined influence of mining stress and the uplift stress from deep limestone aquifers, and the differences in fracture development. A set of comparative schemes for physical simulation is shown below. Figure 4A , Figure 4B As shown, where Figure 4AThe working face roadway layout is with cut-eye aligned and dip aligned. Figure 4B The working face roadway is arranged with staggered cuts and aligned dips.

[0131] The experimental process was recorded, images of the damage depth of the experimental base plate were taken, and the damage depth of the base plate was analyzed. Figure 5A The working face roadway is arranged with the cut-eye aligned. Figure 5B The working face roadway is arranged with staggered cut-in sections.

[0132] The experimental data from the simulation process were compiled into tables, revealing that the internal offset effectively controlled the depth of bottom plate failure and the initial pressure step distance, relatively increasing the thickness of the effective aquitard layer and thus improving the safety of lower-level mining. Table 3 shows a comparison of data from different layout methods.

[0133] Table 3

[0134] First time pressing the stride Periodic pressure step size Depth of damage to the base plate Eye alignment 36m 24m 38m Internal incision 30m 24m 33m

[0135] ②Numerical simulation

[0136] Numerical simulations were conducted for four scenarios: "aligned cut eye with inward tilt," "inward tilt with inward tilt," "inward tilt with aligned cut eye," and "inward tilt with prominent cut eye." The data were compiled and presented in a table. The table shows that the inward tilt scenario resulted in the lowest pressure value and the smallest depth of damage to the base plate. Table 4 is a comparison table of data from the various numerical simulation scenarios.

[0137] Table 4

[0138]

[0139] Based on the above physical simulation and numerical simulation analyses, the Pingmei No. 10 Mine's 33200 working face ultimately adopted a layout of "70m inward offset of the cutting eye and inward offset of the dip direction".

[0140] (2) Layout of the bottom tunnel

[0141] Bottom slab tunnels were arranged 12 to 22.5 meters below the bottom slab of the machine, ventilation tunnel, and cut-out.

[0142] (3) Determination of the mining speed when the working face passes through the deep primary fracture zone

[0143] ① Comparison of whether the mining process was interrupted

[0144] Figure 6 This is an experimental diagram of the physical simulation test points. Figure 7A This diagram illustrates the pressure values ​​required for continuous mining. Figure 7B This diagram illustrates the pressure values ​​during a 24-day mining shutdown.

[0145] like Figure 6 , Figure 7A , Figure 7B As shown, in the early stage of re-mining of the working face, the stress mutation value increases sharply, the disturbance of the bottom plate increases, and the mining should continue without stopping when a small amount of water is produced from the bottom plate.

[0146] ② Comparison of floor failure depth at different mining speeds

[0147] Figure 8 This is a comparison chart showing the changes in the depth of damage to the base plate at different speeds. Within a certain speed range, the faster the propulsion speed, the smaller the depth of damage to the base plate.

[0148] Figures 9A-9C This is a comparison chart of horizontal displacement at different velocities, where... Figure 9A The speed is 2m / d. Figure 9B The speed is 4 m / d. Figure 9C The speed is 8 m / d, from Figures 9A-9C It can be seen that the influence distance of horizontal displacement decreased from 1300m to 800m to 450m. However, considering that excessive speed would lead to rapid stress release and roof collapse, the working face was driven at a speed of 1.2 to 2 times the normal mining speed when passing through the deep primary fracture zone. The water volume of the working face did not change significantly, thus ensuring safe production.

[0149] 2. Water pressure control

[0150] The Pingmei Ji 17-33200 overlying Ji 15-33200 working face has been mined out. During the mining process, a water inrush occurred in the bottom roadway. The bottom roadway, located 12-22.5m below the floor of the Ji 15-33200 machine, ventilation, and cutting face, experienced a maximum inflow of 260.3 m³ / h, eventually stabilizing at 160 m³ / h. The permeability coefficient of the Cambrian limestone at Ji 17-33200 ranges from 0.000402 to 0.726 m / d. The water level in the Cambrian limestone at observation well No. 26 near the Ji 17-33200 working face is -687.4m, and the lowest elevation of the working face is -962m. The water pressure exerted on the Ji 17-33200 working face by the Cambrian limestone water is 2.75 MPa. Based on the actual exposure data of the working face and the data from the bottom roadway limestone water boreholes, the thickness from the coal seam floor to the Cambrian limestone roof is approximately 86m. The depth of the bottom plate failure is approximately 32m, therefore the critical water inrush coefficient is taken as 0.04MPa / m, and the safe water pressure is 2.16MPa (i.e., 220.4m). Thus, the drainage head S is 108.2m. In the 33200 section of the rock protective layer working face, 13 water-control boreholes were drilled in the ventilation roadway, machine roadway, and cut-off section. These boreholes served two purposes: firstly, to verify the presence of water-rich anomalies, and secondly, to facilitate drainage, pressure reduction, and threat mitigation.

[0151] 3. Real-time monitoring, early warning and control of microseismic events

[0152] The structure of a microseismic real-time monitoring and early warning system is as follows: Figure 2As shown, 10 geophones and 2 data acquisition stations are set up in the two roadways of the Pingmei working face, with a spacing of 80-100m.

[0153] Figure 10 For example, a bar chart of 17-33200. Figure 10 As shown, based on the hydrogeological conditions of the working face and the mining engineering diagram, the coal seam is divided into six strata: the shallowest layer below 30m of the upper roof of the Ji17 coal seam, the Ji17 coal seam from 30m to the bottom of the Ji17 coal seam, the upper section of the Carboniferous limestone (0-40m of the bottom of the Ji17 coal seam), the middle section of the Carboniferous limestone (40-65m of the bottom of the Ji17 coal seam), the lower section of the Carboniferous limestone (65-92m of the bottom of the Ji17 coal seam), and the layer deeper than the top interface of the Cambrian limestone. Among them, the shallowest layer below the bottom of the Ji17 coal seam is the roof event, and the deepest layer below the bottom of the Ji17 coal seam is the floor event.

[0154] Figure 11 The distribution maps of microseismic events are displayed from different perspectives: XY, XZ, and YZ. Figure 12 This is a table showing the distribution of microseismic monitoring horizons. For example, the distribution of microseismic events on a certain day during monitoring is as follows: Figure 11 As shown. The event distribution at each level is as follows. Figure 12 As shown, events near the top and bottom of the coal seam are more frequent and account for a larger proportion. However, the middle section of limestone, which is affected by deep water movement, and the deeper sections are the key areas of focus for microseismic monitoring.

[0155] Figure 13 This is an example diagram of a daily microseismic monitoring report's early warning system. Based on the location of the data collection and the distribution of microseismic events in the daily report, conditions for a blue warning are triggered, and a blue-level warning is issued in the daily report, as shown below. Figure 13 As shown.

[0156] Figure 14 A schematic diagram illustrating the process of delineating the area of ​​concentrated deep events. As shown in Figure 14, the monthly overall map of the early warning layer and the events deeper thereafter can be used to delineate the area of ​​concentrated deep events. On July 27, deep micro-seismic events began to occur in the working face about 100m away from this area. As mining progressed, the number of deep events gradually increased. The mine promptly adopted water drainage measures and advanced at a constant speed, ensuring the safe mining of the working face.

[0157] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0158] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0159] Figure 15The diagram shows a schematic of the all-weather, all-space joint prevention and control device for water inrush risk during repeated mining of deep, closely spaced coal seams provided in an embodiment of the present invention. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown, and are described in detail below:

[0160] like Figure 15 As shown, the all-weather and all-space joint prevention and control device 2 for the risk of water inrush caused by repeated mining in deep, close-range coal seams includes:

[0161] Optimization module 21 is used to optimize the working face roadway layout scheme through physical simulation and numerical simulation before mining, forming a cut-in and dip double-internal staggered layout, and to arrange the bottom roadway;

[0162] Treatment module 22 is used to reduce the water pressure at the working face through regional treatment before mining, so as to increase the thickness of the water-resistant layer and reduce the water inrush coefficient;

[0163] The monitoring module 23 is used to monitor the time, space, and intensity information of microseismic events in the mining area and determine the microseismic monitoring and early warning level.

[0164] The drainage module 24 is used to observe the mine pressure value and hydrological information during mining and monitor their changes. At the same time, it combines the microseismic monitoring and early warning level and the deep event-intensive area to control the mining speed and perform fixed-point dynamic drainage and pressure reduction to reduce the water inrush coefficient of the working face.

[0165] In one possible implementation, the optimization module 21 is specifically used for:

[0166] A physical simulation model was created based on the scale of the working face and a similar scale, and the components that make up the physical simulation model were selected according to the actual geological data of the mine.

[0167] Based on a physical simulation model, the roof is linearly pressurized by combining the mining advance time and the combined mechanical properties of the roof coal and rock mass. The floor is pressurized by springs to simulate the pressure of the floor water. A set of comparative schemes are compared. Among them, the comparative schemes have the same dip alignment conditions, and the alignment of the cut-eye and the misalignment of the cut-eye are compared.

[0168] In one possible implementation, the optimization module 21 is specifically used for:

[0169] Based on the borehole columnar section of the monitoring working face and the physical and mechanical parameters of the surrounding rock and coal seam, a model of the overburden movement law during coal seam mining based on fluid-structure interaction simulation is established.

[0170] Orthogonal experimental design method was adopted, and three influencing factors were selected: cut eye layout, dip layout, and mining speed. Cut eye alignment, cut eye misalignment, dip alignment, dip protrusion, dip misalignment, slow mining, medium mining, and fast mining were used as simulation factors and levels. Based on the overburden movement law model, the simulation factors and levels were combined and compared.

[0171] In one possible implementation, governance module 22 is specifically used for:

[0172] Before mining, the thickness of the aquitard layer is increased through regional treatment to control the water inrush coefficient in normal areas to 0.06 MPa / m, and the water inrush coefficient in weak areas is controlled to 0.04 MPa / m through drainage.

[0173] In one possible implementation, the sparse reduction module 24 is specifically used for:

[0174] When the working face is under pressure or the water volume changes more than the preset water volume change threshold, the drainage time of the drainage borehole is controlled by the valve.

[0175] Based on the mining conditions, water is drained in areas with geological structures, dense microseismic deep events, and primary fracture zones.

[0176] The effectiveness of water drainage and pressure reduction is evaluated based on the changes in water level and mine water inflow after the drainage and pressure reduction.

[0177] In one possible implementation, the monitoring module 23 is specifically used for:

[0178] If the daily amplitude of the bottom plate event is higher than the first preset threshold but lower than the second preset threshold, or if micro-seismic events occur mainly in the relatively water-rich thin limestone layer, the warning level is level four.

[0179] If the daily variation of the bottom plate event exceeds the second preset threshold for two days within 7 days, or if the main relatively water-rich thin-layer limestone event occurs for two days within 7 days, or if the Ordovician limestone event occurs, the warning level will be level three.

[0180] If the daily amplitude of a 5-day floor event exceeds the third preset threshold within 7 days, or if a 5-day main relatively water-rich thin-layer limestone event occurs within 7 days, or if a 3-day Ordovician limestone event occurs within 7 days, or if micro-seismic events on the floor near the mining line occur in a vertically continuous pattern, then the warning level is Level II.

[0181] If a Level II warning is issued for three consecutive days, and the Osmo Gray event occurs for three consecutive days, then the warning level will be Level I.

[0182] Based on microseismic monitoring and early warning levels and areas with high density of deep events, the measures include controlling the drilling speed and implementing targeted dynamic drainage and pressure reduction, as well as:

[0183] The pressure intensity is determined based on the frequency change rate and energy index of microseismic events, and corresponding prevention and control measures are taken. These measures include adjusting support measures, velocity control, and water pressure control.

[0184] In one possible implementation, the sparse reduction module 24 is specifically used for:

[0185] The mining speed in deep, event-intensive areas should be controlled at 1.2 to 2 times the normal mining speed.

[0186] This invention utilizes simulated data analysis to control key parameters such as step distance and floor damage depth, and to arrange floor roadways accordingly, thereby achieving mine pressure control. Water pressure management is achieved through dynamic drainage and pressure reduction measures, as well as regional governance. Furthermore, by analyzing the spatiotemporal evolution of microseismic events based on their frequency and depth, different measures are taken according to early warnings, including drainage or reducing the concentration of mine pressure. This comprehensive approach, integrating mine pressure, water pressure, and microseismic monitoring and early warning, enables dynamic joint control throughout the entire mining process, from pre-mining to mining operations, reducing the risk of water inrush and ensuring safe mining operations.

[0187] Figure 16 This is a schematic diagram of a terminal provided in an embodiment of the present invention. Figure 16 As shown, the terminal 3 in this embodiment includes: a processor 30, a memory 31, and a computer program 32 stored in the memory 31 and executable on the processor 30. When the processor 30 executes the computer program 32, it implements the steps in the above embodiments of the all-weather joint prevention and control method for the risk of repeated mining and water inrush in deep, near-distance coal seams, for example... Figure 1 Steps 101 to 104 are shown. Alternatively, when the processor 30 executes the computer program 32, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 15 The functions of modules / units 21 to 24 shown.

[0188] For example, the computer program 32 can be divided into one or more modules / units, which are stored in the memory 31 and executed by the processor 30 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program 32 in the terminal 3. For example, the computer program 32 can be divided into... Figure 15 Modules / units 21 to 24 are shown.

[0189] The terminal 3 can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal 3 may include, but is not limited to, a processor 30 and a memory 31. Those skilled in the art will understand that... Figure 16 This is merely an example of terminal 3 and does not constitute a limitation on terminal 3. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal may also include input / output devices, network access devices, buses, etc.

[0190] The processor 30 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0191] The memory 31 can be an internal storage unit of the terminal 3, such as a hard disk or memory of the terminal 3. The memory 31 can also be an external storage device of the terminal 3, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the terminal 3. Furthermore, the memory 31 can include both internal storage units and external storage devices of the terminal 3. The memory 31 is used to store the computer program and other programs and data required by the terminal. The memory 31 can also be used to temporarily store data that has been output or will be output.

[0192] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0193] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0194] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0195] In the embodiments provided by this invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0196] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0197] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0198] If the integrated module / unit is implemented as 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, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above embodiments of the method for joint prevention and control of water inrush risk during repeated mining in deep, near-distance coal seams. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0199] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for joint prevention and control of water inrush risk during repeated mining in deep, closely spaced coal seams, characterized in that: include: Before mining the lower layer of the close-range coal seam, the roadway layout scheme of the working face is optimized through physical simulation and numerical simulation. Compared with the upper layer working face, a double-staggered layout of cut-in and upper and lower roadways is formed, and the bottom roadway is arranged. Before the lower working face is mined, the thickness of the water-resistant layer is increased through regional treatment to reduce the water inrush coefficient; During the mining process, monitor the temporal, spatial, and intensity information of microseismic events within the monitoring area, and determine the microseismic monitoring and early warning level; During mining, the mine pressure value and hydrological information are observed, and the changes in the mine pressure value and hydrological information are monitored. At the same time, the mining speed is controlled and fixed-point dynamic drainage and pressure reduction are carried out in combination with the microseismic monitoring and early warning level and the deep event-intensive area to reduce the water inrush coefficient of the working face. The determination of the microseismic monitoring and early warning level includes: If the daily amplitude of the bottom plate event is higher than the first preset threshold but lower than the second preset threshold, or if micro-seismic events occur mainly in the relatively water-rich thin limestone layer, the warning level is level four. If the daily variation of the bottom plate event exceeds the second preset threshold for two days within 7 days, or if the main relatively water-rich thin-layer limestone event occurs for two days within 7 days, or if the Ordovician limestone event occurs, the warning level will be level three. If, within 7 days, the daily variation of the floor event exceeds the third preset threshold for 5 days, or if, within 7 days, the main relatively water-rich thin-layer limestone event occurs for 5 days, or if, within 7 days, the Ordovician limestone event occurs for 3 days, or if micro-seismic events of the floor near the mining line occur in a vertically continuous pattern, then the warning level is Level II; wherein, the third preset threshold is greater than the second preset threshold, and the second preset threshold is greater than the first preset threshold. If a Level II warning is issued for three consecutive days, and the Osmo Gray event occurs for three consecutive days, then the warning level will be Level I. The method of controlling the mining speed and implementing fixed-point dynamic drainage and pressure reduction by combining the microseismic monitoring and early warning levels with areas of high density of deep events also includes: The pressure intensity is determined based on the frequency change rate and energy index of microseismic events, and corresponding prevention and control measures are taken based on the pressure intensity. The prevention and control measures include adjusting support measures, velocity control, and water pressure control.

2. The method for joint prevention and control of water inrush risk during repeated mining of deep, closely spaced coal seams according to claim 1, characterized in that, Before mining, the layout of the working face roadways is optimized through physical simulation, including: A physical simulation model is created based on the scale of the working face and a similar scale, and the components that make up the physical simulation model are selected according to the actual geological data of the mine. Based on the physical simulation model, the roof is linearly pressurized in combination with the mining advance time and the combined mechanical properties of the roof coal and rock mass. The floor is pressurized with springs to simulate the pressure of the floor water. A set of comparative schemes are compared. Among them, the comparative schemes are based on the same dip alignment conditions, and the alignment of the cut-eye and the misalignment within the cut-eye are compared.

3. The method for joint prevention and control of water inrush risk during repeated mining of deep, closely spaced coal seams according to claim 1, characterized in that, Before mining, the roadway layout of the working face is optimized through numerical simulation, including: Based on the borehole columnar section of the monitoring working face and the physical and mechanical parameters of the surrounding rock and coal seam, a model of the overburden movement law during coal seam mining based on fluid-structure interaction simulation is established. Using orthogonal experimental design, three influencing factors were selected: cut eye layout, dip layout, and mining speed. Cut eye alignment, cut eye misalignment, dip alignment, dip protrusion, dip misalignment, slow mining, medium mining, and fast mining were used as simulation factors and levels. Based on the overburden movement law model, the simulation factors and levels were combined and compared.

4. The method for joint prevention and control of water inrush risk during repeated mining of deep, closely spaced coal seams according to claim 1, characterized in that, The method of increasing the thickness of the aquitard layer through regional treatment before mining to reduce the water inrush coefficient includes: Before mining, the thickness of the aquitard layer is increased through regional treatment to control the water inrush coefficient in normal areas to 0.06 MPa / m, and the water inrush coefficient in weak areas is controlled to 0.04 MPa / m through drainage.

5. The method for joint prevention and control of water inrush risk during repeated mining of deep, closely spaced coal seams according to claim 1, characterized in that, The fixed-point dynamic hydrophobic depressurization includes: When the working face is under pressure or the water volume changes more than the preset water volume change threshold, the drainage time of the drainage borehole is controlled by the valve. Based on the mining conditions, dynamic drainage is carried out in geological structural areas, areas with dense microseismic deep events, and primary fracture zones. The water inrush coefficient in normal areas is 0.06 MPa / m, and the water inrush coefficient in geologically weak areas is 0.04 MPa / m. The effectiveness of water drainage and pressure reduction is evaluated based on the changes in water level and mine water inflow after the drainage and pressure reduction.

6. The method for joint prevention and control of water inrush risk during repeated mining of deep, closely spaced coal seams according to claim 1, characterized in that, The aforementioned control of the mining speed includes: The mining speed in deep, event-intensive areas should be controlled at 1.2 to 2 times the normal mining speed.

7. A joint prevention and control device for water inrush risk during repeated mining of deep, closely spaced coal seams, characterized in that, include: The optimization module is used to optimize the roadway layout scheme of the working face through physical and numerical simulations before the lower working face is mined, forming a double-staggered layout of the cut-in and upper and lower roadways, and to arrange the bottom roadway. The treatment module is used to increase the thickness of the aquitard layer through regional treatment before mining, so as to reduce the water inrush coefficient; The monitoring module is used to monitor the time, space, and intensity information of microseismic events in the mining area and determine the microseismic monitoring and early warning level. The drainage module is used to observe the mine pressure value and hydrological information during mining, and to monitor the changes in the mine pressure value and hydrological information. At the same time, it combines the microseismic monitoring and early warning level and the deep event-intensive area to control the mining speed and perform fixed-point dynamic drainage and pressure reduction to reduce the water inrush coefficient of the working face. The monitoring module is specifically used for: If the daily amplitude of the bottom plate event is higher than the first preset threshold but lower than the second preset threshold, or if micro-seismic events occur mainly in the relatively water-rich thin limestone layer, the warning level is level four. If the daily variation of the bottom plate event exceeds the second preset threshold for two days within 7 days, or if the main relatively water-rich thin-layer limestone event occurs for two days within 7 days, or if the Ordovician limestone event occurs, the warning level will be level three. If, within 7 days, the daily variation of the floor event exceeds the third preset threshold for 5 days, or if, within 7 days, the main relatively water-rich thin-layer limestone event occurs for 5 days, or if, within 7 days, the Ordovician limestone event occurs for 3 days, or if micro-seismic events of the floor near the mining line occur in a vertically continuous pattern, then the warning level is Level II; wherein, the third preset threshold is greater than the second preset threshold, and the second preset threshold is greater than the first preset threshold. If a Level II warning is issued for three consecutive days, and the Osmo Gray event occurs for three consecutive days, then the warning level will be Level I. The shunting module is also used for: The pressure intensity is determined based on the frequency change rate and energy index of microseismic events, and corresponding prevention and control measures are taken based on the pressure intensity. The prevention and control measures include adjusting support measures, velocity control, and water pressure control.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 6 above.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 6 above.

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