Reconstruction method for partition grouting water-resisting layer after mining of roof coal measure aquifer and related equipment

Abstract

According to the roof coal measure aquifer post-mining partition grouting water-resisting layer reconstruction method and the related equipment provided by the invention, for the post-mining coal seam roof water disaster treatment problem, accurate analysis of coal seam roof rock stratum hydrogeological characteristics is realized by comprehensively considering the geological parameters and the stratum distribution parameters of the target mining area. Then, the development height of the water-flowing fractured zone is accurately determined by using a distribution characteristic algorithm and a numerical simulation algorithm, and then the correlation between the water-flowing fractured zone and hydrogeological characteristics is deeply analyzed through a distribution relation algorithm, so that the difference of different geological conditions can be fully considered; therefore, grouting treatment is carried out according to the target grouting treatment strategy of the mined coal seam roof determined based on the distribution relation, the pertinence of water disaster treatment can be remarkably improved, the problem that the grouting treatment effect is poor due to complex geological conditions is solved, and the water disaster risk of the coal seam roof is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of coal mine water hazard control, and in particular to a method for reconstructing a water-proof layer by grouting after mining a roof coal-bearing aquifer and related equipment. Background Art

[0002] Coal mining often faces the problems of water resource protection and mine water hazards. During the coal seam recovery process, the overlying impermeable layer will experience different degrees of compression, shear and tension damage due to additional stress, resulting in changes in its water-proof performance. The damage to the impermeable layer causes water in the overlying aquifer to seep through the impermeable layer into the goaf, which in turn causes water disasters such as mine water inrush, and aggravates the loss of shallow surface water resources, ultimately leading to damage to the regional ecological environment. The damage to the groundwater system and impermeable layer caused by coal mining activities not only causes a large loss of water resources and a drop in groundwater levels, but also significantly increases production safety risks and the occurrence of environmental problems.

[0003] Based on the above situation, the existing technology uses grouting to block water and recreate a waterproof layer to control and protect mine water hazards, but does not take different geological conditions into consideration. Therefore, it lacks specificity in water hazard control and cannot achieve effective grouting control. Summary of the invention

[0004] In view of this, the purpose of this application is to propose a method and related equipment for reconstructing the waterproof layer by grouting after mining in the roof coal-bearing aquifer, so as to solve the above-mentioned technical problems.

[0005] Based on the above purpose, the first aspect of the present application provides a method for reconstructing a water-proof layer by grouting after mining in a roof coal-bearing aquifer, comprising:

[0006] Acquire geological parameters of a target mining area, and determine stratum distribution parameters of the target mining area based on the geological parameters;

[0007] Based on the stratum distribution parameters, characteristic analysis is performed by using a distribution characteristic algorithm to determine the hydrogeological characteristics of the coal seam roof strata in the target mining area;

[0008] Based on the hydrogeological characteristics, a numerical simulation algorithm is used to analyze and process the water-conducting fracture zone to determine the development height of the water-conducting fracture zone;

[0009] According to the height of the water-conducting fracture zone and the hydrogeological characteristics, a distribution relationship analysis is performed through a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and a target grouting treatment strategy for the coal seam roof after mining is determined based on the distribution relationship;

[0010] The post-mining coal seam roof is grouting treated according to the target grouting treatment strategy.

[0011] Optionally, the determining the hydrogeological characteristics of the coal seam roof strata in the target mining area by performing characteristic analysis processing based on the stratum distribution parameters through a distribution characteristic algorithm includes:

[0012] Perform groundwater flow simulation based on the formation distribution parameters to obtain groundwater flow simulation results;

[0013] The hydrogeological characteristics of the coal seam roof strata in the target mining area are determined based on the groundwater flow simulation results.

[0014] Optionally, the analyzing and processing the water-conducting fracture zone by using a numerical simulation algorithm based on the hydrogeological characteristics to determine the development height of the water-conducting fracture zone includes:

[0015] Constructing a geological characteristic simulation model of the stratum where the target mining area is located based on the hydrogeological characteristics;

[0016] According to the preset mining thickness threshold, the geological feature simulation model is used to simulate the mining of the stratum where the target mining area is located to obtain the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum, and the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum is used as the development height of the water-conducting fracture zone.

[0017] Optionally, the hydrogeological characteristics further include weathered bedrock locations and / or loose aquifer locations and / or abnormally water-rich areas;

[0018] The method of performing distribution relationship analysis and processing according to the height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain the distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determining a target grouting treatment strategy for the coal seam roof after mining based on the distribution relationship includes:

[0019] Determining the distribution relationship according to the development height of the water-conducting fracture zone and the position of the weathered bedrock;

[0020] In response to the distribution relationship that the height of the water-conducting fracture zone is not inside the weathered bedrock, it is determined whether there is an abnormally water-rich area inside the height of the water-conducting fracture zone, and a first determination result is obtained;

[0021] In response to the first judgment result being no, determining the target grouting treatment strategy for the coal seam roof after mining as no grouting treatment required;

[0022] In response to the first judgment result being yes, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the impermeable layer in each highly water-rich area of ​​the aquifer within the development height of the water-conducting fracture zone.

[0023] Optionally, after determining the distribution relationship according to the height of the water-conducting fracture zone and the position of the weathered bedrock, the method further includes:

[0024] In response to the distribution relationship that the height of the water-conducting fracture zone is located inside the weathered bedrock, it is determined whether the height of the water-conducting fracture zone is located at the loose aquifer to obtain a second determination result;

[0025] In response to the second judgment result being no, determining whether the loose aquifer position overflows and recharges to the weathered bedrock position, and obtaining a third judgment result;

[0026] In response to the third judgment result being yes, it is determined whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and a fourth judgment result is obtained;

[0027] In response to the fourth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to grout the weathered bedrock position, and performing curved branch drilling grouting in the aquiclude in each aquifer with a strong water-rich area within the height of the water-conducting fracture zone;

[0028] In response to the fourth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be grouting the weathered bedrock position, and grouting repair of the aquiclude within the development height of the water-conducting fracture zone, and reconstruction of the aquiclude.

[0029] Optionally, in response to the second judgment result being no, it is determined whether the loose aquifer position overflows and recharges to the weathered bedrock position. After obtaining the third judgment result, the method further includes:

[0030] In response to the third judgment result being no, determining whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and obtaining a fifth judgment result;

[0031] In response to the fifth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to perform curved branch drilling grouting in the impermeable layer of each aquifer with strong water-richness in the development height of the water-conducting fracture zone;

[0032] In response to the fifth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be grouting repair of the aquiclude within the development height of the water-conducting fracture zone and reconstruction of the aquiclude.

[0033] Optionally, in response to the distribution relationship that the height of the water-conducting fracture zone is located inside the weathered bedrock, it is determined whether the height of the water-conducting fracture zone is located at the position of the loose aquifer. After obtaining the second determination result, the method further includes:

[0034] In response to the second judgment result being yes, determining whether the development height of the water-conducting fracture zone enters the weathered bedrock position, and obtaining a sixth judgment result;

[0035] In response to the sixth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to grout the weathered bedrock position, and performing curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone;

[0036] In response to the sixth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone.

[0037] Based on the same inventive concept, the second aspect of the present application provides a post-mining zone grouting water-proof layer reconstruction device for a roof coal-bearing aquifer, comprising:

[0038] An acquisition module is configured to acquire geological parameters of a target mining area and determine stratum distribution parameters of the target mining area based on the geological parameters;

[0039] A feature analysis module is configured to perform feature analysis processing based on the stratum distribution parameters through a distribution feature algorithm to determine the hydrogeological characteristics of the coal seam roof strata in the target mining area;

[0040] A water-conducting fracture zone analysis module is configured to perform water-conducting fracture zone analysis and processing based on the hydrogeological characteristics through a numerical simulation algorithm to determine the development height of the water-conducting fracture zone;

[0041] A distribution relationship analysis module is configured to perform distribution relationship analysis processing according to the development height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain the distribution relationship between the development height of the water-conducting fracture zone and the hydrogeological characteristics, and determine a target grouting treatment strategy for the coal seam roof after mining based on the distribution relationship;

[0042] The grouting treatment module is configured to perform grouting treatment on the post-mining coal seam roof according to the target grouting treatment strategy.

[0043] Based on the same inventive concept, the third aspect of the present application provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the method described in the first aspect above when executing the computer program.

[0044] From the above, it can be seen that the post-mining zone grouting water-proof layer reconstruction method and related equipment for the roof coal-bearing aquifer provided in this application, aimed at the post-mining coal seam roof water hazard control problem, by comprehensively considering the geological parameters and stratum distribution parameters of the target mining area, realizes the accurate analysis of the hydrogeological characteristics of the coal seam roof rock layer. Then, the distribution characteristic algorithm and the numerical simulation algorithm are used to accurately determine the development height of the water-conducting fracture zone, and then the distribution relationship algorithm is used to deeply analyze the relationship between the water-conducting fracture zone and the hydrogeological characteristics, which can fully consider the differences in different geological conditions. Therefore, according to the target grouting control strategy for the post-mining coal seam roof determined based on the distribution relationship, grouting control can significantly improve the pertinence of water hazard control, avoid the problem of poor grouting control effect caused by complex geological conditions, and effectively reduce the risk of coal seam roof water hazard. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0046] Figure 1 It is a flow chart of the method for reconstructing the aquifer by grouting after mining in the roof coal-bearing aquifer of the embodiment of the present application;

[0047] Figure 2 It is a schematic diagram of the process of reconstructing the aquifer by grouting after mining the roof coal-bearing aquifer in the embodiment of the present application;

[0048] Figure 3 This is a schematic diagram of the governance solution I of the embodiment of the present application;

[0049] Figure 4 A schematic diagram of the governance scheme II of the embodiment of the present application;

[0050] Figure 5 A schematic diagram of the governance solution III of the embodiment of the present application;

[0051] Figure 6 A schematic diagram of the treatment scheme IV of the embodiment of the present application;

[0052] Figure 7 A schematic diagram of the rock formation of the coal seam roof after mining in an embodiment of the present application;

[0053] Figure 8 It is a structural block diagram of a post-mining zone grouting water-proof layer reconstruction device for a roof coal-bearing aquifer according to an embodiment of the present application;

[0054] Fig. 9 A schematic diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0056] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] It is understandable that before using the technical solutions of each embodiment of the present application, the type, scope of use, usage scenarios, etc. of the personal information involved will be informed to the user in an appropriate manner, and the user's authorization will be obtained.

[0058] For example, in response to receiving an active request from a user, a prompt message is sent to the user to clearly remind the user that the operation requested to be performed will require obtaining and using the user's personal information. Thus, the user can independently choose whether to provide personal information to the electronic device, application, server, storage medium or other software or hardware that performs the operation of the technical solution of the present application according to the prompt message.

[0059] As an optional but non-limiting implementation, in response to receiving the user's active request, the prompt information may be sent to the user in the form of a pop-up window, in which the prompt information may be presented in text form. In addition, the pop-up window may also carry a selection control for the user to choose "agree" or "disagree" to provide personal information to the electronic device.

[0060] It is understandable that the above notification and the process of obtaining user authorization are merely illustrative and do not constitute a limitation on the implementation method of this application. Other methods that meet relevant laws and regulations may also be applied to the implementation method of this application.

[0061] Coal mining often faces problems of water resource protection and mine water hazards, especially in arid and semi-arid areas where the ecological environment is fragile and water resources are scarce.

[0062] During coal mining, the overlying impermeable layer will be damaged by compression, shear and tension to varying degrees due to additional stress, resulting in changes in its impermeable properties. The damage to the impermeable layer causes water in the overlying aquifer to seep through the impermeable layer into the goaf, which in turn causes water disasters such as mine water inrush, and aggravates the loss of shallow surface water resources, ultimately leading to damage to the regional ecological environment. The damage to the groundwater system and impermeable layer caused by coal mining activities not only causes a large loss of water resources and a drop in groundwater levels, but also significantly increases production safety risks and the occurrence of environmental problems.

[0063] In response to the above problems, grouting water blocking technology is currently mainly used to control and protect mine water hazards. In recent years, related technologies have conducted research at different levels on issues related to the movement of aquicludes from their respective fields, and have achieved a series of important results. In terms of the control and protection of roof water, a method for reconstructing aquicludes has been proposed.

[0064] For example, the exploration and evaluation method for reconstruction of aquicludes is a method for exploring and evaluating whether the aquicludes (rock and soil layers) can recover quickly over time under natural conditions after the aquicludes are damaged by mining; or

[0065] The multi-stage graded grouting method for recreating the mining-induced overburden aquifer is to seal the fractures of different scales at multiple target points by performing three-stage grouting at multiple grouting target points, thereby recreating the mining-induced overburden aquifer; or

[0066] A water-preserving and anti-blowout coal mining method based on pressure-releasing fracture grouting to recreate an anti-blowout and waterproof layer. This method pre-cracks the thick hard sandstone layer overlying the coal seam before mining, and transforms the original hard and thick sandstone layer overlying the coal seam into an anti-blowout and waterproof layer.

[0067] Although the methods involved in the above-mentioned related technologies all involve the reconstruction of impermeable layers, none of them distinguish the relative relationship between different bedrock conditions, distribution characteristics of water-rich aquifer areas, collapse zones, and development heights of water-conducting fissures, and the water hazard control plans lack specificity.

[0068] Therefore, how to effectively carry out grouting treatment for roof water types with different bedrock conditions, regional distribution characteristics of water-rich aquifers, fracture zones, and the height of water-conducting fissures is an important issue related to mine safety production and regional ecological environmental protection.

[0069] The embodiment of the present application provides a method for reconstructing the aquifer of the roof coal-bearing aquifer by grouting after mining. In view of the water hazard control problem of the roof of the coal seam after mining, the geological parameters and stratum distribution parameters of the target mining area are comprehensively considered to achieve an accurate analysis of the hydrogeological characteristics of the rock strata on the roof of the coal seam. Then, the development height of the water-conducting fracture zone is accurately determined by using the distribution characteristic algorithm and the numerical simulation algorithm, and then the relationship between the water-conducting fracture zone and the hydrogeological characteristics is deeply analyzed by the distribution relationship algorithm, which can fully consider the differences in different geological conditions. Therefore, grouting treatment according to the target grouting treatment strategy of the roof of the coal seam after mining based on the distribution relationship can significantly improve the pertinence of water hazard control, avoid the problem of poor grouting treatment effect caused by complex geological conditions, and effectively reduce the risk of water hazard on the roof of the coal seam.

[0070] like Figure 1 As shown, the method of this embodiment includes:

[0071] Step 101, obtaining geological parameters of a target mining area, and determining stratum distribution parameters of the target mining area based on the geological parameters.

[0072] In this step, for the target mining area, the geological parameters include but are not limited to: lithology (rock type), stratum thickness, stratum inclination, fault distribution, fold morphology, magma activity, mineralization type, etc.

[0073] Geological parameters such as mining area geological and hydrogeological data mainly include the collection of coal mine drilling, drill cores, logging curves, coal seam thickness, roof rock hardness, content, spatial distribution characteristics and combination relationships of impermeable layers.

[0074] These parameters can be obtained through geophysical exploration (such as seismic exploration, electrical exploration, magnetic exploration, etc.) or remote sensing technology.

[0075] After obtaining the geological parameters of the target mining area, the next task is to infer and determine the stratigraphic distribution of the mining area based on these parameters.

[0076] Stratigraphic distribution parameters refer to data and information that describe the spatial distribution and arrangement characteristics of strata, such as the stratigraphic sequence, stratigraphic position, thickness variation, spatial distribution morphology, etc.

[0077] Stratigraphic distribution parameters such as loose water-bearing bottom interface and weathered bedrock extent.

[0078] The geological parameters can be converted into a three-dimensional model or a two-dimensional plane map of the stratigraphic distribution through three-dimensional geological modeling, so as to intuitively display the distribution characteristics of the strata in the mining area and further determine the stratigraphic distribution parameters of the target mining area.

[0079] Step 102, based on the stratum distribution parameters, characteristic analysis processing is performed using a distribution characteristic algorithm to determine the hydrogeological characteristics of the coal seam roof strata in the target mining area.

[0080] In this step, the distribution feature algorithm can extract useful information from the complex stratigraphic distribution parameters, namely the hydrogeological characteristics of the coal seam roof rock strata in the target mining area, and thus provide a deeper understanding of the distribution patterns, interrelationships and possible geological processes of the stratigraphic layers.

[0081] Hydrogeological characteristics describe the distribution and movement of groundwater in the target mining area and its relationship with geological structures.

[0082] Among them, hydrogeological characteristics usually involve the permeability, water content, and groundwater flow of rock formations, which are crucial for evaluating mining conditions and preventing water disasters in mining areas. Hydrogeological characteristics may include the source of groundwater recharge, flow direction, flow rate, water level changes, and distribution of aquifers.

[0083] For example, the vertical distribution of the aquifer and impermeable layer in the roof of the coal seam and the water-richness of the aquifer are judged. By analyzing the geological and hydrogeological data of the mining area (i.e., stratigraphic distribution parameters), the specific vertical interlayer distribution pattern of the roof aquifer and the impermeable layer is analyzed (i.e., hydrogeological characteristics), the position of the aquifer and impermeable layer is accurately determined (i.e., hydrogeological characteristics), the strong water-rich areas of the aquifer after mining are discovered (i.e., hydrogeological characteristics), and the distribution pattern of the water-rich areas of the aquifer is analyzed (i.e., hydrogeological characteristics).

[0084] Step 103, based on the hydrogeological characteristics, a numerical simulation algorithm is used to analyze and process the water-conducting fracture zone to determine the development height of the water-conducting fracture zone.

[0085] In this step, before conducting water-conducting fracture zone analysis, it is necessary to have a comprehensive understanding of the hydrogeological characteristics of the target mining area, including basic information such as lithology, thickness, permeability, groundwater level, as well as spatial distribution and geological structure of the strata.

[0086] Special attention should also be paid to whether there are geological structures such as faults and joints in the target mining area, because these structures may affect the development of water-conducting fracture zones.

[0087] According to the hydrogeological characteristics of the target mining area and specific analysis requirements, appropriate numerical simulation algorithms are selected through simulation software (such as FLAC3D, UDEC, RFPA, 3DEC, ANSYS, COMSOL, etc.) to simulate the mechanical behavior and deformation process under actual engineering conditions.

[0088] Among them, FLAC3D is based on explicit Lagrangian finite difference calculation and can simulate the mechanical behavior and deformation process of rock mass; while RFPA focuses on the analysis of rock fracture process and is suitable for simulating the deformation and collapse of overlying rock strata after coal mining.

[0089] After selecting a suitable numerical simulation algorithm, it is necessary to establish a corresponding numerical model, which includes the establishment of an engineering geological physics conceptual model, which includes the mechanical and structural properties of the rock formations in the study area, as well as the stress and deformation boundaries of the rock formations.

[0090] In order to improve the calculation accuracy, it is necessary to encrypt the grid of key parts in the study area and set the initial conditions and boundary conditions of the model according to the actual situation.

[0091] The established numerical model is used to analyze and process the water-conducting fracture zone, which includes simulating the deformation and collapse of the overlying rock strata after coal mining, and analyzing the development characteristics of the water-conducting fracture zone.

[0092] Through the simulation results, key parameters such as the development height and morphology of the water-conducting fracture zone (i.e., the development height of the water-conducting fracture zone) can be determined.

[0093] For example, physical monitoring, numerical simulation and other methods can be used, and one or more methods such as borehole flushing fluid method, microseismic detection, downhole water injection leak detection method or borehole television method can be used for actual measurement. One or more of FLAC, UDEC, RFPA, 3DEC, ANSYS, and COMSOL software can be used to numerically simulate the height of fracture zone development, and comprehensively analyze the height of the collapse zone and the water-conducting fracture zone (i.e., the height of the water-conducting fracture zone development).

[0094] Step 104, performing distribution relationship analysis and processing based on the development height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain the distribution relationship between the development height of the water-conducting fracture zone and the hydrogeological characteristics, and determining the target grouting treatment strategy for the coal seam roof after mining based on the distribution relationship.

[0095] In this step, the water-conducting fracture zone refers to the fractured area with water-conducting capacity formed by the movement and fracture of the overlying rock strata after coal seam mining. These fractures may allow groundwater to flow, thus posing a threat to the safe production of coal mines. The development height refers to the distribution and extension of these water-conducting fracture zones in the space above the coal seam roof, including their size, shape, direction and depth.

[0096] The distribution relationship algorithm is used to analyze the association or mutual influence between the development height of the water-conducting fracture zone and the hydrogeological characteristics, and obtain the distribution relationship. The distribution relationship is used to reveal the intrinsic connection between the development height of the water-conducting fracture zone and the hydrogeological characteristics.

[0097] Based on the above distribution relationship, a targeted grouting management strategy for the coal seam roof can be formulated.

[0098] Grouting treatment is a coal mine water prevention and control technology that injects slurry (such as cement slurry, chemical slurry, etc.) into cracks in the coal seam roof or aquifers to seal the cracks, reduce water permeability, and enhance the stability of the rock formation.

[0099] The target grouting treatment strategy may include the selection of grouting points, the selection of grouting materials, the setting of grouting pressure and the monitoring of the grouting process.

[0100] By accurately analyzing the distribution relationship between the development height of water-conducting fracture zones and hydrogeological characteristics, a more effective and targeted coal seam roof grouting management strategy can be developed to ensure safe production in coal mines.

[0101] Step 105, performing grouting treatment on the post-mining coal seam roof according to the target grouting treatment strategy.

[0102] In this step, grouting management is carried out according to the target grouting management strategy for the coal seam roof after mining based on the distribution relationship, which can significantly improve the targeted nature of water hazard management, avoid the problem of poor grouting management effect caused by complex geological conditions, and effectively reduce the risk of water hazard in the coal seam roof.

[0103] Through the above scheme, in view of the problem of post-mining coal seam roof water hazard control, by comprehensively considering the geological parameters and stratum distribution parameters of the target mining area, an accurate analysis of the hydrogeological characteristics of the coal seam roof rock strata is achieved. Then, the distribution characteristic algorithm and the numerical simulation algorithm are used to accurately determine the development height of the water-conducting fracture zone, and then the distribution relationship algorithm is used to deeply analyze the relationship between the water-conducting fracture zone and the hydrogeological characteristics, which can fully consider the differences in different geological conditions. Therefore, according to the target grouting control strategy for the post-mining coal seam roof determined based on the distribution relationship, grouting control can significantly improve the pertinence of water hazard control, avoid the problem of poor grouting control effect caused by complex geological conditions, and effectively reduce the risk of coal seam roof water hazard.

[0104] In some embodiments, in step 101, determining the stratum distribution parameters of the target mining area based on the geological parameters includes:

[0105] Step A1, based on the geological parameters, a geological structure analysis is performed on the stratum where the target mining area is located to obtain a geological structure analysis result.

[0106] Step A2, comparing the preset geological structure parameters of different strata with the geological structure analysis results to obtain a comparison result.

[0107] Step A3: using the comparison result to divide the stratum where the target mining area is located, to obtain the stratum distribution parameters of the target mining area.

[0108] In the above scheme, the collected geological parameters are used to conduct geological structural analysis on the strata where the target mining area is located, understand the structure, morphology and spatial relationship between the strata, and obtain the results of geological structural analysis. The results of geological structural analysis reveal geological phenomena such as faults, folds, and uplifts in the strata.

[0109] Before the comparison is made, there is a set of preset geological structural parameters of different strata as a reference. These parameters may be determined based on known geological data and empirical data from similar areas.

[0110] The geological structure analysis results are compared with the preset geological structure parameters of different strata to find out the similarities and differences between the target mining area strata and the known strata, thereby obtaining the comparison results.

[0111] Based on the comparison results, the strata where the target mining area is located can be divided and classified according to their geological characteristics, structural types or relative positions with other strata.

[0112] Finally, through the stratigraphic division, the stratigraphic distribution parameters of the target mining area can be obtained. The stratigraphic distribution parameters may include the thickness, distribution range, relative position of each stratum and the contact relationship between them.

[0113] Geological parameters such as mining area geological and hydrogeological data mainly include the collection of coal mine drilling, drilling core, logging curves, coal seam thickness, roof rock hardness, aquiclude and aquiclude spatial distribution characteristics and combination relationships. Based on this, the loose water-bearing bottom interface and weathered bedrock range (i.e., stratum distribution parameters) are delineated, and the strata are finely divided.

[0114] In some embodiments, step 102 includes:

[0115] Step B1, performing groundwater flow simulation based on the formation distribution parameters to obtain groundwater flow simulation results.

[0116] Step B2, determining the hydrogeological characteristics of the coal seam roof rock layer in the target mining area according to the groundwater flow simulation results.

[0117] In the above scheme, the formation distribution parameters include but are not limited to the formation lithology, thickness, permeability, porosity and other parameters. These parameters are the basis for the subsequent groundwater flow simulation.

[0118] The collected formation distribution parameters are used to simulate the groundwater flow model (such as numerical model, analytical model or physical model). This simulation process aims to simulate the flow of groundwater in different formations, including flow velocity, direction, flow rate, etc. The groundwater flow simulation results are used to reflect the dynamic characteristics of the groundwater system.

[0119] After obtaining the groundwater flow simulation results, these results need to be analyzed in detail, including identifying the main flow paths of groundwater, determining the water content of different strata, and evaluating the potential impact of groundwater on the roof rock of the coal seam.

[0120] Based on the analysis of the groundwater flow simulation results, the hydrogeological characteristics of the roof rock of the coal seam in the target mining area can be further determined. These characteristics may include the permeability of the rock formation, the distribution of the aquifer, the recharge and discharge conditions of groundwater, etc. This information is of great significance for evaluating the mining conditions of the mining area, preventing water disasters, and formulating reasonable mining plans.

[0121] For example, the stratigraphic distribution parameters are the geological and hydrogeological data of the mining area. The hydrogeological characteristics are the specific vertical interlayer distribution patterns of the coal seam roof aquifer and aquiclude, the locations of the aquifer and aquiclude, as well as the strong water-rich areas of the aquifer and the distribution patterns of the water-rich areas of the aquifer.

[0122] The vertical distribution of the aquifer and impermeable layer in the roof of the coal seam and the water-richness of the aquifer are judged. By analyzing the geological and hydrogeological data of the mining area, the specific vertical interlayer distribution pattern of the roof aquifer and the impermeable layer is analyzed, the location of the aquifer and impermeable layer is accurately determined, the strong water-rich areas of the aquifer after mining are explored, and the distribution pattern of the water-rich areas of the aquifer is analyzed.

[0123] In some embodiments, step 103 includes:

[0124] Step C1, constructing a geological characteristic simulation model of the stratum where the target mining area is located based on the hydrogeological characteristics.

[0125] Step C2, according to the preset mining thickness threshold, the geological feature simulation model is used to simulate the mining of the stratum where the target mining area is located, to obtain the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum, and the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum is used as the development height of the water-conducting fracture zone.

[0126] In the above scheme, the hydrogeological characteristics include the distribution and flow of groundwater, the properties of the aquifer, the permeability of rocks, the recharge and discharge conditions of groundwater, etc.

[0127] Based on the hydrogeological characteristics, a simulation model (i.e., geological characteristics simulation model) is constructed that can reflect the real geological characteristics of the strata where the target mining area is located (such as stratum structure, rock properties, groundwater dynamics, etc.). Specifically, geological modeling software or tools can be used to create a three-dimensional geological model (i.e., geological characteristics simulation model) based on the hydrogeological characteristics. This model will be used for subsequent simulation and analysis.

[0128] Before the simulation begins, a mining thickness threshold (i.e., preset mining thickness threshold) needs to be set. This threshold is determined based on factors such as safe mining conditions and geological stability of the mining area.

[0129] Using the geological feature simulation model constructed earlier, simulated mining is carried out according to the preset mining thickness threshold. This process will simulate the deformation and collapse of the overlying rock during mining.

[0130] After simulated mining, a series of deformation parameters (such as water-conducting fracture zone height, displacement, strain, etc.) and collapse parameters (such as collapse zone height, etc.) of the overlying rock strata can be obtained.

[0131] These deformation and collapse parameters are used to predict and assess the height of the water-conducting fracture zone that may be formed during mining. The water-conducting fracture zone is formed by the collapse and deformation of the overlying rock strata caused by mining, which may affect the flow of groundwater and the safety of the mine.

[0132] In addition, physical monitoring, numerical simulation and other methods can also be used, specifically, one or more methods such as borehole flushing fluid method, microseismic detection, downhole water injection leak detection method or borehole television method are used for actual measurement, and one or more of FLAC, UDEC, RFPA, 3DEC, ANSYS, COMSOL software are used to perform numerical simulation of the height of fracture zone development, and comprehensively analyze the height of the collapse zone and the water-conducting fracture zone (i.e., the height of the water-conducting fracture zone development).

[0133] In some embodiments, the hydrogeological features also include locations of weathered bedrock and / or locations of unconsolidated aquifers and / or areas of abnormally rich water.

[0134] Step 104 includes:

[0135] Step D1, determining the distribution relationship according to the development height of the water-conducting fracture zone and the position of the weathered bedrock.

[0136] Step D2, in response to the distribution relationship that the development height of the water-conducting fracture zone is not within the weathered bedrock, it is determined whether there is an abnormally water-rich area within the development height of the water-conducting fracture zone, and a first determination result is obtained.

[0137] Step D3, in response to the first judgment result being no, determining the target grouting treatment strategy for the coal seam roof after mining as no grouting treatment required.

[0138] Step D4, in response to the first judgment result being yes, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the impermeable layer in each highly water-rich area of ​​the aquifer within the development height of the water-conducting fracture zone.

[0139] In the above scheme, when the water-conducting fracture zone has not developed into the weathered bedrock, it is determined whether there is an abnormally water-rich area in the water-conducting fracture zone. If not, the target grouting treatment strategy for the coal seam roof after mining is determined to be no need for targeted treatment. Or,

[0140] If so, the target grouting management strategy for the coal seam roof after mining is to carry out curved branch drilling grouting in the impermeable layer below each independent strong water-rich area of ​​the aquifer located within the development height of the water-conducting fracture zone, repair the rock strata damaged by the water-conducting fracture zone, and create local impermeable bodies. Then, by controlling the forward direction of the branch drilling, the repaired impermeable bodies are grouted in series to make them a whole and form a complete impermeable layer.

[0141] In some embodiments, after step D1, the method further comprises:

[0142] Step E1, in response to the distribution relationship that the development height of the water-conducting fracture zone is within the weathered bedrock, it is determined whether the development height of the water-conducting fracture zone is at the position of the loose aquifer to obtain a second determination result.

[0143] Step E2, in response to the second judgment result being no, determining whether the loose aquifer position overflows and recharges to the weathered bedrock position, and obtaining a third judgment result.

[0144] Step E3, in response to the third judgment result being yes, it is determined whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and a fourth judgment result is obtained.

[0145] Step E4, in response to the fourth judgment result being yes, the target grouting management strategy for the coal seam roof after mining is determined to be grouting at the weathered bedrock position, and to perform curved branch drilling grouting in the impermeable layer in each highly water-rich area of ​​the aquifer within the development height of the water-conducting fracture zone.

[0146] Step E5, in response to the fourth judgment result being no, determining the target grouting management strategy for the coal seam roof after mining to grout the weathered bedrock position, and grouting repair the aquiclude within the development height of the water-conducting fracture zone, and reconstructing the aquiclude.

[0147] In the above scheme, when the water-conducting fracture zone develops into the weathered bedrock, it is determined whether the water-conducting fracture zone develops into the loose aquifer. If not, it is determined whether the loose aquifer overflows and recharges the weathered bedrock aquifer. If so, it is determined whether there is an abnormally water-rich area in the water-conducting fracture zone. If so, the target grouting management strategy for the coal seam roof after mining is determined to be a construction drill hole, and the end of the drill hole is located in the weathered bedrock below the loose aquifer. Slurry is injected into the weathered bedrock for grouting modification, and curved branch drilling and grouting are performed in the impermeable layer below the strong water-rich area of ​​the aquifer located within the development height of the water-conducting fracture zone to repair the rock layer damaged by the water-conducting fracture zone and create a local impermeable body. After that, by controlling the forward direction of the branch drill hole, the repaired impermeable bodies are grouted in series to make them a whole and form a complete impermeable layer.

[0148] If there is no abnormally water-rich area in the water-conducting fracture zone, the target grouting management strategy for the coal seam roof after mining is to construct a borehole with the end of the borehole located in the weathered bedrock below the loose aquifer, inject slurry into the weathered bedrock for grouting modification, and construct a curved branch borehole. The curved branch borehole is located in the aquiclude below the strong water-rich area of ​​the aquifer and within the development height of the water-conducting fracture zone, creating a new and complete aquiclude on the basis of repairing the aquiclude damaged by the water-conducting fracture zone.

[0149] In some embodiments, after step E2, the method further comprises:

[0150] Step F1, in response to the third judgment result being no, it is determined whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and a fifth judgment result is obtained.

[0151] Step F2, in response to the fifth judgment result being yes, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the impermeable layer in each highly water-rich area of ​​the aquifer within the development height of the water-conducting fracture zone.

[0152] Step F3, in response to the fifth judgment result being no, determining the target grouting management strategy for the coal seam roof after mining to repair the aquiclude within the height of the water-conducting fracture zone by grouting, and to recreate the aquiclude.

[0153] In the above scheme, if the loose aquifer does not overflow and recharge the weathered bedrock aquifer, it is determined whether there is an abnormally water-rich area in the water-conducting fracture zone. If so, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the impermeable layer below the strong water-rich area of ​​each independent aquifer located within the development height of the water-conducting fracture zone, repair the rock layer damaged by the water-conducting fracture zone, and create a local impermeable body. After that, by controlling the forward direction of the branch drilling, the repaired impermeable bodies are grouted in series to make them a whole and form a complete impermeable layer. If not, the target grouting management strategy for the coal seam roof after mining is determined to be to construct curved branch drilling holes, which are located in the impermeable layer below the strong water-rich area of ​​the aquifer and within the development height of the water-conducting fracture zone, and a new complete impermeable layer is created on the basis of repairing the impermeable layer damaged by the water-conducting fracture zone.

[0154] In some embodiments, after step E1, the method further comprises:

[0155] Step G1, in response to the second judgment result being yes, determining whether the development height of the water-conducting fracture zone enters the weathered bedrock position, and obtaining a sixth judgment result.

[0156] Step G2, in response to the sixth judgment result being yes, determining the target grouting management strategy for the coal seam roof after mining to grout the weathered bedrock position, and performing curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone.

[0157] Step G3, in response to the sixth judgment result being negative, determining the target grouting management strategy for the coal seam roof after mining as performing curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone.

[0158] In the above scheme, if the water-conducting fracture zone develops into the loose aquifer, it is determined whether the fracture zone range enters the weathered bedrock. If so, the target grouting management strategy for the coal seam roof after mining is determined to be ultra-thin bedrock, and a borehole is constructed. The end of the borehole is located in the weathered bedrock below the loose aquifer, and slurry is injected into the weathered bedrock for grouting modification. In addition, curved branch drilling grouting is carried out above the collapse zone, and a dual gradient grouting scheme of grouting materials and grouting pressure is implemented to form a reconstructed impermeable layer.

[0159] If not, the target grouting management strategy for the coal seam roof after mining is to determine it as thin bedrock, conduct curved branch drilling grouting above the collapse zone, and implement a dual gradient grouting scheme of grouting materials and grouting pressure to form a reconstructed impermeable layer.

[0160] In some embodiments, the schematic diagram of the process of post-mining grouting and water-proofing layer reconstruction of the roof coal-bearing aquifer of the present application is as follows: Figure 2 As shown:

[0161] Step 201, perform geological exploration on the mining activity area and perform fine division of the strata;

[0162] Step 202, determining the vertical distribution of the aquifer and water-retaining layer in the roof of the coal seam after mining and the water-richness of the aquifer;

[0163] Step 203, comprehensively analyzing the development height of the collapse zone and water-conducting fissures under mining conditions by means of calculation, monitoring, simulation, etc.;

[0164] Step 204, formulate a treatment plan (i.e., target grouting treatment strategy): Plans I, II, III, and IV, select corresponding treatment plans according to different roof conditions after mining.

[0165] Among them, Figure 3 As shown, Scheme I: construct a borehole, with the end of the borehole located in the weathered bedrock below the loose aquifer, and inject slurry into the weathered bedrock for grouting modification.

[0166] like Figure 4 As shown, Scheme II: construct curved branch boreholes. The curved branch boreholes are located in the aquiclude below the highly water-rich area of ​​the aquifer and within the height of the water-conducting fracture zone. A new and complete aquiclude is created on the basis of repairing the aquiclude damaged by the water-conducting fracture zone.

[0167] like Figure 5 As shown, Scheme III: Curved branch drilling and grouting are carried out in the impermeable layer below each independent highly water-rich area of ​​the aquifer located within the development height of the water-conducting fracture zone to repair the rock layer damaged by the water-conducting fracture zone and create a local impermeable body. After that, by controlling the forward direction of the branch drilling, the repaired impermeable bodies are grouted in series to make them a whole and form a complete impermeable layer.

[0168] like Figure 6As shown, Scheme IV: Carry out grouting of curved branch boreholes above the collapse zone, implement a dual gradient grouting scheme of grouting materials (slurry particle size) and grouting pressure, and form a reconstructed aquiclude. According to different post-mining situations, 8 different combined treatment schemes are formulated, specifically: ① When the water-conducting fracture zone has not developed into the weathered bedrock and the water-conducting fracture zone does not contain a water-rich area, no grouting treatment is required; ② When the water-conducting fracture zone has not developed into the weathered bedrock and the water-conducting fracture zone contains a water-rich area, select Scheme II for treatment; ③ When the water-conducting fracture zone develops into the weathered bedrock, the loose aquifer does not overflow and recharge the weathered bedrock aquifer, and the water-conducting fracture zone does not contain a water-rich area, select Scheme II for treatment; ④ When the water-conducting fracture zone develops into the weathered bedrock, the loose aquifer does not overflow and recharge the weathered bedrock aquifer, and the water-conducting fracture zone does not contain a water-rich area, select Scheme II for treatment. ⑤ When the water-conducting fracture zone develops into the weathered bedrock, the loose aquifer overflows and recharges the weathered bedrock aquifer, and the water-conducting fracture zone does not contain water-rich areas, select Scheme Ⅰ+Ⅱ for governance; ⑥ When the water-conducting fracture zone develops into the weathered bedrock, the loose aquifer overflows and recharges the weathered bedrock aquifer, and the water-conducting fracture zone contains water-rich areas, select Scheme Ⅰ+Ⅲ for governance; ⑦ When the fracture zone does not enter the weathered bedrock, select Scheme Ⅳ for governance; ⑧ When the fracture zone enters the weathered bedrock, select Scheme Ⅰ+Ⅳ for governance;

[0169] Among them, the dual-gradient grouting of slurry particle size and grouting pressure described in Scheme IV is specifically as follows: the particle size of the slurry material is divided into two grades, large and small. The large-size grouting material is composed of aggregate-clay-cement-water slurry, and the small-size grouting material is composed of cement-clay-water glass-water slurry. First, the clay-cement-water slurry material is grouted to fill large-sized cracks. After the aggregate-clay-cement-water slurry material solidifies, cement-clay-water glass-water slurry is grouted to fill the remaining smaller cracks. The grouting pressure is divided into two grades, high and low. When injecting large-size slurry, a low-grade grouting pressure is used to control the diffusion range of the slurry while filling larger voids and cracks; when injecting small-size slurry, a low-grade grouting pressure is used to ensure the filling of small voids and cracks.

[0170] Step 205, determine whether the water-conducting fracture zone has developed into the weathered bedrock, if not (N), execute step 206, if yes (Y), execute step 207;

[0171] Step 206, determine whether there is an abnormally water-rich area in the water-conducting fracture zone. If not (N), determine that the target grouting treatment strategy for the coal seam roof after mining is that no targeted treatment is required. If (Y), determine that the target grouting treatment strategy for the coal seam roof after mining is Scheme III, that is, perform curved branch drilling and grouting in the impermeable layer below each independent aquifer with a strong water-rich area within the development height of the water-conducting fracture zone, repair the rock layer damaged by the water-conducting fracture zone, and create a local impermeable body. Then, by controlling the forward direction of the branch drilling, the repaired impermeable bodies are grouted in series to make them a whole and form a complete impermeable layer;

[0172] Step 207, determining whether the water-conducting fracture zone has developed into the loose aquifer, if not (N), executing step 208, if yes (Y), executing step 209;

[0173] Step 208, determine whether the loose aquifer overflows and recharges the weathered bedrock aquifer, if yes (Y), execute step 210, if no, execute step 211;

[0174] Step 209, determine whether the fracture zone range has entered the weathered bedrock. If (Y), determine that the target grouting management strategy for the coal seam roof after mining is to determine that it is ultra-thin bedrock, plan I+IV, that is, to construct a borehole, the end of the borehole is located in the weathered bedrock below the loose aquifer, inject slurry into the weathered bedrock for grouting modification, and perform curved branch drilling grouting above the collapse zone, implement a dual gradient grouting scheme of grouting materials and grouting pressure, and form a reconstructed aquiclude. If not (N), determine that the target grouting management strategy for the coal seam roof after mining is to determine that it is thin bedrock, plan IV, that is, to perform curved branch drilling grouting above the collapse zone, implement a dual gradient grouting scheme of grouting materials and grouting pressure, and form a reconstructed aquiclude;

[0175] Step 210, determine whether there is an abnormally water-rich area in the water-conducting fracture zone. If (Y), determine that the target grouting management strategy for the coal seam roof after mining is I+III, that is, construct a borehole, and the end of the borehole is located in the weathered bedrock below the loose aquifer, inject slurry into the weathered bedrock for grouting modification, and perform curved branch drilling and grouting in the impermeable layer below each independent aquifer with a strong water-rich area within the development height of the water-conducting fracture zone to repair the rock layer damaged by the water-conducting fracture zone and create a local impermeable body. Thereafter, by controlling the forward direction of the branch borehole, the repaired impermeable bodies are grouted in series to make them a whole and form a complete impermeable layer. If not (N), the target grouting treatment strategy for the post-mining coal seam roof is determined to be Ⅰ+Ⅱ, that is, to construct a borehole, the end of which is located in the weathered bedrock below the loose aquifer, inject slurry into the weathered bedrock for grouting modification, and to construct a curved branch borehole, which is located in the aquiclude below the strong water-rich area of ​​the aquifer and within the height of the water-conducting fracture zone, and to create a new complete aquiclude on the basis of repairing the aquiclude damaged by the water-conducting fracture zone;

[0176] Step 211, continuously track the sealing effect of the waterproof layer through water level monitoring wells, ground monitoring equipment, etc., and when necessary, perform additional grouting reinforcement to ensure long-term waterproof effect.

[0177] In addition, the rock strata diagram of the coal seam roof after mining in the target mining area is as follows: Figure 7 shown.

[0178] This application selects different schemes for grouting treatment by judging different bedrock conditions, the distribution pattern of water-rich areas of aquifers, collapse zones, and the development height of water-conducting fissures. It can transform loose aquifers and repair damaged impermeable layers, thereby preventing roof water from entering the goaf after mining, reducing mine water inflow, and protecting the groundwater system.

[0179] In some embodiments, after the mining work is completed, the water inflow in the goaf exceeds the normal value, and the water in the goaf is subjected to hydrochemical analysis to determine which water-rich areas are the source of the water inflow, and then grouting and water-proofing layer reconstruction are performed according to the source, and the process is as follows:

[0180] Determine the zoning of aquifers based on borehole data;

[0181] Prediction of water-conducting fracture zones, preliminary determination of water-rich area strata;

[0182] After mining, when the water inflow reaches 80% of the mine's designed discharge volume, the aquiclude needs to be reconstructed.

[0183] Conduct precise water chemistry analysis, locate the source of water inrush, and formulate corresponding grouting strategies.

[0184] Among them, the way to locate the source of water inrush is to use the mine water inrush source identification based on the coupling of hydrochemical field and hydrodynamic field tracer simulation. The comprehensive identification results of mine water inrush source based on the coupling of hydrochemical field machine learning analysis and hydrodynamic field reverse tracer simulation.

[0185] Among them, the grouting range is determined by:

[0186] Scheme I: Select the bottom interface of weathered bedrock as the treatment layer, according to the empirical formula Calculate the night diffusion radius, the grouting hole is R / 2 above the bottom interface of weathered bedrock. The width is 50m extending outward from the working surface.

[0187] Scheme II: Based on the analyzed range of the water-conducting fracture zone, the top of the water-conducting fracture zone development range is taken as the grouting layer. The grouting hole is located R / 2 below the top interface of the water-conducting fracture zone, and the width extends 50m outward in the horizontal direction of the water-conducting fracture zone development range.

[0188] Scheme III: Determine the trend line of the impermeable layer according to the location of the water source. The grouting hole is located at R / 2 below the bottom interface of the aquifer and extends 50m outward from the bottom of the water source area as the boundary of the grouting range.

[0189] Scheme IV: According to the analyzed collapse zone range, the top of the collapse zone development range is taken as the grouting layer, the grouting hole is R / 2 above the top interface of the collapse zone, and the width extends 50m outward in the horizontal direction along the development range of the water-conducting fracture zone.

[0190] Grouting process: When the target layer is not exposed during drilling, if a small amount of flushing fluid is lost, a plugging agent is used to plug the leak before drilling. If a large amount of flushing fluid is lost, thick cement slurry is used to plug the leak before drilling.

[0191] When drilling along the target layer, the construction principle is "grouting once every 30m or so (if there is a leakage point, start again 30m from the leakage point), grouting at the end of the branch hole, and grouting as leakage occurs". When there is no leakage in the entire branch hole, high-pressure grouting is carried out every 30m or so of drilling in each section or at the end of the branch hole.

[0192] Slurry selection: Clay cement slurry is used in weathered bedrock areas, with clay slurry as the main component and a small amount of cement and water glass added. Generally speaking, the volume percentages of various components in clay cement slurry are: clay slurry 90% to 96%, cement 3% to 6%, and water glass 1.5% to 3%.

[0193] Cement single slurry grouting area is used in the water-conducting fracture zone. ① In the normal section (loss volume less than 3m3 / h), the water-cement ratio is 3:1 (specific gravity 1.2) and the concentration is gradually increased to 2.5:1, 2:1, 1.5:1, and 1:1 when the wellhead pressure does not rise. After the wellhead pressure rises steadily and reaches the grouting end pressure standard, 3:1 slurry is used to continue the steady pressure grouting to obtain the grouting parameters; ② In the weak leakage section (loss volume>3m3 / h and not completely lost), the water-cement ratio is 3:1 or 2:1 (depending on the leakage situation) and the water-cement ratio is gradually increased to 2.5:1, 2:1, and 1:1 when the wellhead pressure does not rise. At the same time, intermittent grouting is considered as an alternative. ③ In the strong leakage section (total leakage), the water-solid ratio is 2:1 and gradually increased to 1:1. At the same time, quick-setting agent and intermittent grouting are considered as alternatives.

[0194] Grouting end standard: Two grouting end standards are designed this time: ① The pump volume reaches below 30L / min, and the grouting pressure reaches the end pressure standard determined by the grouting test, and is stable for more than 30min (including 30min); ② If the grouting fails to reach the end standard pressure for a long time, but the grouting volume meets the design requirements, the single grouting is terminated.

[0195] It should be noted that the method of the embodiment of the present application can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the described method.

[0196] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0197] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a post-mining zone grouting waterproofing layer reconstruction device for the roof coal-bearing aquifer.

[0198] refer to Figure 8 The post-mining grouting water-proof layer reconstruction device for the roof coal-bearing aquifer comprises:

[0199] The acquisition module 801 is configured to acquire geological parameters of a target mining area, and determine the stratigraphic distribution parameters of the target mining area based on the geological parameters;

[0200] The feature analysis module 802 is configured to perform feature analysis processing based on the stratum distribution parameters by using a distribution feature algorithm to determine the hydrogeological features of the coal seam roof strata in the target mining area;

[0201] The water-conducting fracture zone analysis module 803 is configured to perform water-conducting fracture zone analysis and processing based on the hydrogeological characteristics through a numerical simulation algorithm to determine the development height of the water-conducting fracture zone;

[0202] The distribution relationship analysis module 804 is configured to perform distribution relationship analysis processing according to the height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain the distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determine the target grouting treatment strategy of the coal seam roof after mining based on the distribution relationship;

[0203] The grouting treatment module 805 is configured to perform grouting treatment on the post-mining coal seam roof according to the target grouting treatment strategy.

[0204] In some embodiments, the acquisition module 801 is specifically configured to:

[0205] Based on the geological parameters, a geological structure analysis is performed on the stratum where the target mining area is located to obtain a geological structure analysis result;

[0206] Comparing the preset geological structure parameters of different strata with the geological structure analysis results to obtain a comparison result;

[0207] The strata where the target mining area is located are divided using the comparison results to obtain the strata distribution parameters of the target mining area.

[0208] In some embodiments, the feature analysis module 802 is specifically configured to:

[0209] Perform groundwater flow simulation based on the formation distribution parameters to obtain groundwater flow simulation results;

[0210] The hydrogeological characteristics of the coal seam roof strata in the target mining area are determined based on the groundwater flow simulation results.

[0211] In some embodiments, the water-conducting fracture zone analysis module 803 is specifically configured as follows:

[0212] Constructing a geological characteristic simulation model of the stratum where the target mining area is located based on the hydrogeological characteristics;

[0213] According to the preset mining thickness threshold, the geological feature simulation model is used to simulate the mining of the stratum where the target mining area is located to obtain the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum, and the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum is used as the development height of the water-conducting fracture zone.

[0214] In some embodiments, the hydrogeological features further include weathered bedrock locations and / or unconsolidated aquifer locations and / or abnormally water-rich areas;

[0215] The distribution relationship analysis module 804 is specifically configured to:

[0216] Determining the distribution relationship according to the development height of the water-conducting fracture zone and the position of the weathered bedrock;

[0217] In response to the distribution relationship that the height of the water-conducting fracture zone is not inside the weathered bedrock, it is determined whether there is an abnormally water-rich area inside the height of the water-conducting fracture zone, and a first determination result is obtained;

[0218] In response to the first judgment result being no, determining the target grouting treatment strategy for the coal seam roof after mining as no grouting treatment required;

[0219] In response to the first judgment result being yes, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the impermeable layer in each highly water-rich area of ​​the aquifer within the development height of the water-conducting fracture zone.

[0220] In some embodiments, the post-mining zone grouting water-proof layer reconstruction device for the roof coal-bearing aquifer further includes a first grouting management strategy determination module. After determining the distribution relationship according to the height of the water-conducting fracture zone and the position of the weathered bedrock, the first grouting management strategy determination module is specifically configured as follows:

[0221] In response to the distribution relationship that the height of the water-conducting fracture zone is located inside the weathered bedrock, it is determined whether the height of the water-conducting fracture zone is located at the loose aquifer to obtain a second determination result;

[0222] In response to the second judgment result being no, determining whether the loose aquifer position overflows and recharges to the weathered bedrock position, and obtaining a third judgment result;

[0223] In response to the third judgment result being yes, it is determined whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and a fourth judgment result is obtained;

[0224] In response to the fourth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to grout the weathered bedrock position, and performing curved branch drilling grouting in the aquiclude in each aquifer with a strong water-rich area within the height of the water-conducting fracture zone;

[0225] In response to the fourth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be grouting the weathered bedrock position, and grouting repair of the aquiclude within the development height of the water-conducting fracture zone, and reconstruction of the aquiclude.

[0226] In some embodiments, the post-mining zone grouting water-proof layer reconstruction device for the roof coal-bearing aquifer further includes a second grouting governance strategy determination module. In response to the second judgment result being no, it is determined whether the loose aquifer position overflows and recharges to the weathered bedrock position. After obtaining the third judgment result, the second grouting governance strategy determination module is specifically configured as follows:

[0227] In response to the third judgment result being no, determining whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and obtaining a fifth judgment result;

[0228] In response to the fifth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to perform curved branch drilling grouting in the impermeable layer of each aquifer with strong water-richness in the development height of the water-conducting fracture zone;

[0229] In response to the fifth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be grouting repair of the aquiclude within the development height of the water-conducting fracture zone and reconstruction of the aquiclude.

[0230] In some embodiments, the post-mining zone grouting water-proof layer reconstruction device for the roof coal-bearing aquifer further includes a third grouting management strategy determination module. In response to the distribution relationship that the development height of the water-conducting fracture zone is inside the weathered bedrock, it is judged whether the development height of the water-conducting fracture zone is at the position of the loose aquifer. After obtaining the second judgment result, the third grouting management strategy determination module is specifically configured as follows:

[0231] In response to the second judgment result being yes, determining whether the development height of the water-conducting fracture zone enters the weathered bedrock position, and obtaining a sixth judgment result;

[0232] In response to the sixth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to grout the weathered bedrock position, and performing curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone;

[0233] In response to the sixth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone.

[0234] For the convenience of description, the above device is described in terms of functions divided into various modules. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0235] The device of the above embodiment is used to implement the corresponding post-mining zonal grouting waterproofing layer reconstruction method of the roof coal-bearing aquifer in any of the above embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0236] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for reconstructing aquifers by zoning grouting after mining of the roof coal-bearing aquifer as described in any of the above embodiments is implemented.

[0237] Fig. 9 A more specific schematic diagram of the hardware structure of an electronic device provided in this embodiment is shown, and the device may include: a processor 901, a memory 902, an input / output interface 903, a communication interface 904, and a bus 905. The processor 901, the memory 902, the input / output interface 903, and the communication interface 904 are connected to each other in communication within the device through the bus 905.

[0238] The processor 901 can be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0239] The memory 902 may be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 902 may store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program codes are stored in the memory 902 and are called and executed by the processor 901.

[0240] The input / output interface 903 is used to connect the input / output module to realize information input and output. The input / output module can be configured in the device as a component (not shown in the figure), or it can be externally connected to the device to provide corresponding functions. The input device may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device may include a display, a speaker, a vibrator, an indicator light, etc.

[0241] The communication interface 904 is used to connect a communication module (not shown) to realize communication interaction between the device and other devices. The communication module can realize communication through a wired mode (such as USB, network cable, etc.) or a wireless mode (such as mobile network, WIFI, Bluetooth, etc.).

[0242] The bus 905 includes a path that transmits information between various components of the device (eg, the processor 901 , the memory 902 , the input / output interface 903 , and the communication interface 904 ).

[0243] It should be noted that, although the above device only shows a processor 901, a memory 902, an input / output interface 903, a communication interface 904, and a bus 905, in a specific implementation process, the device may also include other components necessary for normal operation. In addition, it can be understood by those skilled in the art that the above device may also only include components necessary for implementing the embodiments of the present specification, and does not necessarily include all the components shown in the figure.

[0244] The electronic device of the above embodiment is used to implement the corresponding post-mining zonal grouting waterproofing layer reconstruction method of the roof coal-bearing aquifer in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be repeated here.

[0245] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the post-mining zone grouting aquiclude reconstruction method for the roof coal-bearing aquifer as described in any of the above embodiments.

[0246] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0247] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the method for reconstructing the waterproof layer by grouting after mining of the roof coal-bearing aquifer as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0248] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0249] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0250] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0251] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A method for reconstructing a water-proof layer by grouting after mining a roof coal-bearing aquifer, characterized in that: include: Acquire geological parameters of a target mining area, and determine stratum distribution parameters of the target mining area based on the geological parameters; Based on the stratum distribution parameters, characteristic analysis is performed by using a distribution characteristic algorithm to determine the hydrogeological characteristics of the coal seam roof strata in the target mining area; Based on the hydrogeological characteristics, a numerical simulation algorithm is used to analyze and process the water-conducting fracture zone to determine the development height of the water-conducting fracture zone; According to the height of the water-conducting fracture zone and the hydrogeological characteristics, a distribution relationship analysis is performed through a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and a target grouting treatment strategy for the coal seam roof after mining is determined based on the distribution relationship; The post-mining coal seam roof is grouting treated according to the target grouting treatment strategy.

2. The method according to claim 1, characterized in that The determining of the stratum distribution parameters of the target mining area based on the geological parameters includes: Based on the geological parameters, a geological structure analysis is performed on the stratum where the target mining area is located to obtain a geological structure analysis result; Comparing the preset geological structure parameters of different strata with the geological structure analysis results to obtain a comparison result; The strata where the target mining area is located are divided using the comparison results to obtain the strata distribution parameters of the target mining area.

3. The method according to claim 1, characterized in that The characteristic analysis and processing based on the formation distribution parameters by using a distribution characteristic algorithm to determine the hydrogeological characteristics of the coal seam roof strata in the target mining area includes: Perform groundwater flow simulation based on the formation distribution parameters to obtain groundwater flow simulation results; The hydrogeological characteristics of the coal seam roof strata in the target mining area are determined based on the groundwater flow simulation results.

4. The method according to claim 1, characterized in that The method of analyzing and processing the water-conducting fracture zone by using a numerical simulation algorithm based on the hydrogeological characteristics to determine the development height of the water-conducting fracture zone includes: Constructing a geological characteristic simulation model of the stratum where the target mining area is located based on the hydrogeological characteristics; According to the preset mining thickness threshold, the geological feature simulation model is used to simulate the mining of the stratum where the target mining area is located to obtain the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum, and the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum is used as the development height of the water-conducting fracture zone.

5. The method according to claim 1, characterized in that The hydrogeological features also include the location of weathered bedrock and / or the location of unconsolidated aquifers and / or areas of abnormally high water content; The method of performing distribution relationship analysis and processing according to the height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain the distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determining a target grouting treatment strategy for the coal seam roof after mining based on the distribution relationship includes: Determining the distribution relationship according to the development height of the water-conducting fracture zone and the position of the weathered bedrock; In response to the distribution relationship that the height of the water-conducting fracture zone is not inside the weathered bedrock, it is determined whether there is an abnormally water-rich area inside the height of the water-conducting fracture zone, and a first determination result is obtained; In response to the first judgment result being no, determining the target grouting treatment strategy for the coal seam roof after mining as no grouting treatment required; In response to the first judgment result being yes, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the impermeable layer in each highly water-rich area of ​​the aquifer within the development height of the water-conducting fracture zone.

6. The method according to claim 5, characterized in that After determining the distribution relationship according to the height of the water-conducting fracture zone and the position of the weathered bedrock, the method further includes: In response to the distribution relationship that the height of the water-conducting fracture zone is located inside the weathered bedrock, it is determined whether the height of the water-conducting fracture zone is located at the loose aquifer to obtain a second determination result; In response to the second judgment result being no, determining whether the loose aquifer position overflows and recharges to the weathered bedrock position, and obtaining a third judgment result; In response to the third judgment result being yes, it is determined whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and a fourth judgment result is obtained; In response to the fourth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to grout the weathered bedrock position, and performing curved branch drilling grouting in the aquiclude in each aquifer with a strong water-rich area within the height of the water-conducting fracture zone; In response to the fourth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be grouting the weathered bedrock position, and grouting repair of the aquiclude within the development height of the water-conducting fracture zone, and reconstruction of the aquiclude.

7. The method according to claim 6, characterized in that In response to the second judgment result being no, it is determined whether the loose aquifer position overflows and recharges to the weathered bedrock position. After obtaining the third judgment result, the method further includes: In response to the third judgment result being no, determining whether there is an abnormally water-rich area inside the water-conducting fracture zone development height, and obtaining a fifth judgment result; In response to the fifth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to perform curved branch drilling grouting in the impermeable layer of each aquifer with strong water-richness in the development height of the water-conducting fracture zone; In response to the fifth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be grouting repair of the aquiclude within the development height of the water-conducting fracture zone and reconstruction of the aquiclude.

8. The method according to claim 6, characterized in that In response to the distribution relationship that the height of the water-conducting fracture zone is located inside the weathered bedrock, it is determined whether the height of the water-conducting fracture zone is located at the loose aquifer. After obtaining the second determination result, the method further includes: In response to the second judgment result being yes, determining whether the development height of the water-conducting fracture zone enters the weathered bedrock position, and obtaining a sixth judgment result; In response to the sixth judgment result being yes, determining the target grouting treatment strategy for the coal seam roof after mining to grout the weathered bedrock position, and performing curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone; In response to the sixth judgment result being no, the target grouting management strategy for the coal seam roof after mining is determined to be to perform curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone.

9. A post-mining grouting water-proof layer reconstruction device for the roof coal-bearing aquifer, characterized in that: include: An acquisition module is configured to acquire geological parameters of a target mining area and determine stratum distribution parameters of the target mining area based on the geological parameters; A feature analysis module is configured to perform feature analysis processing based on the stratum distribution parameters through a distribution feature algorithm to determine the hydrogeological characteristics of the coal seam roof strata in the target mining area; A water-conducting fracture zone analysis module is configured to perform water-conducting fracture zone analysis and processing based on the hydrogeological characteristics through a numerical simulation algorithm to determine the development height of the water-conducting fracture zone; A distribution relationship analysis module is configured to perform distribution relationship analysis processing according to the development height of the water-conducting fracture zone and the hydrogeological characteristics through a distribution relationship algorithm to obtain the distribution relationship between the development height of the water-conducting fracture zone and the hydrogeological characteristics, and determine a target grouting treatment strategy for the coal seam roof after mining based on the distribution relationship; The grouting treatment module is configured to perform grouting treatment on the post-mining coal seam roof according to the target grouting treatment strategy.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 8 is implemented.

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