Method for reconstructing water-resisting layer by post partition grouting in coal-bearing aquifer of roof and related equipment

Abstract

The application provides a roof coal series aquifer post-mining partition grouting aquifuge reconstruction method and related equipment, aiming at the problem of coal seam roof water disaster control after mining, by comprehensively considering the geological parameters and stratum distribution parameters of the target mining area, the accurate analysis of the hydrogeological characteristics of the coal seam roof rock stratum is realized. Then, the development height of the water flowing fractured zone is accurately determined by using the distribution characteristic algorithm and the numerical simulation algorithm, and then the correlation between the water flowing fractured zone and the hydrogeological characteristics is analyzed in depth by using the distribution relationship algorithm, so that the difference of different geological conditions can be fully considered, therefore, the grouting treatment according to the target grouting treatment strategy of the post-mining coal seam roof determined based on the distribution relationship can significantly improve the pertinence of water disaster control, avoid the problem of poor grouting treatment effect caused by complex geological conditions, and effectively reduce the risk of coal seam roof water disaster.

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 zoning grouting after mining a roof coal-bearing aquifer and related equipment. Background Art

[0002] Coal mining often faces challenges in water resource protection and mine water hazards. During coal mining, the overlying aquiclude undergoes varying degrees of compression, shear, and tension damage due to additional stress, causing changes in its water-repellent properties. Damage to the aquiclude allows water from the overlying aquifer to seep through it into the goaf, triggering water disasters such as mine water inrush, exacerbating the loss of shallow surface water resources, and ultimately damaging the regional ecological environment. Coal mining activities damage groundwater systems and aquicludes, not only causing massive water loss and a drop in groundwater levels, but also significantly increasing 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 aquiclude 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 aquifer by grouting after mining in the roof coal-bearing aquifer, so as to solve the above technical problems.

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

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

[0007] Based on the stratum distribution parameters, characteristic analysis is performed 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] performing a distribution relationship analysis based on the height of the water-conducting fracture zone and the hydrogeological characteristics using a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determining a target grouting treatment strategy for the post-mining coal seam roof based on the distribution relationship;

[0010] Grouting treatment is performed on the post-mining coal seam roof according to the target grouting treatment strategy.

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

[0012] Performing groundwater flow simulation based on the stratum 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 further comprises: performing a distribution relationship analysis based on the height of the water-conducting fracture zone and the hydrogeological characteristics using a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determining a target grouting treatment strategy for the post-mining coal seam roof based on the distribution relationship, including:

[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 indicating that the height of the water-conducting fracture zone is not within the weathered bedrock, determining whether there is an abnormally water-rich area within the height of the water-conducting fracture zone, and obtaining a first determination result;

[0021] In response to the first judgment result being no, determining the target grouting treatment strategy for the post-mining coal seam roof 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 aquiclude 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 based on 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 indicating that the height of the water-conducting fracture zone is located inside the weathered bedrock, determining 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 the weathered bedrock position, thereby obtaining a third judgment result;

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

[0027] In response to the fourth judgment result being yes, determining the target grouting treatment strategy for the post-mining coal seam roof as grouting the weathered bedrock position, and performing curved branch drilling grouting in the aquiclude in each highly water-rich area of ​​the aquifer 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 negative, determining whether the loose aquifer location overflows and recharges the weathered bedrock location, and 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 within 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 post-mining coal seam roof to be performing curved branch drilling grouting in the aquiclude in each aquifer in a highly water-rich area within the height of the water-conducting fracture zone;

[0032] In response to the fifth judgment result being no, the target grouting treatment 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 indicating that the height of the water-conducting fracture zone is located within 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:

[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 post-mining coal seam roof to be grouting at the weathered bedrock position, and performing curved branch drilling grouting at 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 performing 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 aquiclude reconstruction device for a roof coal-bearing aquifer, comprising:

[0038] an acquisition module 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 configured to perform feature analysis processing based on the stratum distribution parameters using 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 configured to perform water-conducting fracture zone analysis based on the hydrogeological characteristics using a numerical simulation algorithm to determine the development height of the water-conducting fracture zone;

[0041] a distribution relationship analysis module configured to perform distribution relationship analysis based on the height of the water-conducting fracture zone and the hydrogeological characteristics using a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determine a target grouting treatment strategy for the post-mining coal seam roof 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 this application provides an electronic device, comprising a memory, a processor, and a computer program stored on 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 barrier reconstruction method and related equipment provided by this application for 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, grouting treatment according to the target grouting treatment strategy of the post-mining coal seam roof determined based on the distribution relationship can significantly improve the pertinence of water hazard control, avoid the problem of poor grouting treatment effect due to 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 this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0046] Figure 1 This is a flow chart of a method for recreating a water-proof layer by grouting after mining in a roof coal-bearing aquifer according to an embodiment of the present application;

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

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

[0049] Figure 4 A schematic diagram of the treatment solution II of the embodiment of the present application;

[0050] Figure 5 This is a schematic diagram of the treatment solution III of the embodiment of the present application;

[0051] Figure 6 This is a schematic diagram of the treatment solution 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 This is a structural block diagram of a post-mining zone grouting aquiclude reconstruction device for a roof coal-bearing aquifer according to an embodiment of the present application;

[0054] Figure 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 this application more clear, this 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 have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before 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 may 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 this 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 a user's active request, a prompt message is sent to the user to clearly inform the user that the operation requested will require the acquisition and use of 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 this application based on the prompt message.

[0059] As an optional but non-limiting implementation, in response to a 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. Furthermore, the pop-up window may also contain a selection control for the user to select "agree" or "disagree" to provide personal information to the electronic device.

[0060] It is understandable that the above notification and user authorization process are merely illustrative and do not constitute a limitation on the implementation of this application. Other methods that comply with relevant laws and regulations may also be applied to the implementation 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 aquiclude undergoes varying degrees of compression, shear, and tension damage due to additional stresses, causing changes in its water-retaining properties. Damage to the aquiclude allows water from the overlying aquifer to seep through it into the goaf, triggering water disasters such as mine water inrush, exacerbating the loss of shallow surface water resources, and ultimately damaging the regional ecological environment. Coal mining activities damage groundwater systems and aquicludes, not only causing massive water loss and a drop in groundwater levels, but also significantly increasing production safety risks and environmental problems.

[0063] To address these issues, grouting and water blocking technology is currently the primary method used to manage and protect against mine water hazards. In recent years, research has been conducted at various levels within related fields to address the issues related to aquiclude mining, resulting in a series of important achievements. For roof water management and protection, aquiclude reconstruction methods have been proposed.

[0064] For example, the aquiclude reconstruction exploration and evaluation method is a method for exploring and evaluating whether the aquiclude (rock and soil layer) can quickly recover over time under natural conditions after the aquiclude's (rock and soil layer) water-proof performance is 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 targets, 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 aquiclude layer is proposed. 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 aquiclude 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 relationships between different bedrock conditions, the distribution characteristics of water-rich areas of aquifers, collapse zones, and the 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 development 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 order to solve the problem of water hazard control of the coal seam roof after mining, the method comprehensively considers the geological parameters and stratum distribution parameters of the target mining area, and realizes the accurate analysis of the hydrogeological characteristics of the coal seam roof stratum. 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, grouting treatment according to the target grouting treatment strategy of the coal seam roof after mining based on the distribution relationship can significantly improve the pertinence of water hazard control, avoid the problem of poor grouting treatment effect due to complex geological conditions, and effectively reduce the risk of water hazard in the coal seam roof.

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

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

[0072] In this step, for the target mining area, geological parameters include but are not limited to: lithology (rock type), stratum thickness, stratum dip, 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, aquiclude and aquiclude spatial distribution characteristics and combination relationships.

[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 the loose water-bearing bottom interface and the extent of weathered bedrock.

[0078] Three-dimensional geological modeling can be used to convert geological parameters into a three-dimensional model or a two-dimensional plane map of the stratum distribution, thereby intuitively displaying the distribution characteristics of the strata within the mining area and further determining the stratum distribution parameters of the target mining area.

[0079] Step 102 : performing feature analysis processing based on the stratum distribution parameters using a distribution feature algorithm to determine the hydrogeological features 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, mutual relationships 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] Hydrogeological characteristics typically involve rock permeability, water content, and groundwater flow. This information is crucial for assessing mining conditions and preventing water disasters in mining areas. Hydrogeological characteristics may include the source of groundwater recharge, flow direction, flow rate, water level fluctuations, and the distribution of aquifers.

[0083] For example, the vertical distribution of the aquifer and impermeable layers in the coal seam roof 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 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 explored (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 : 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.

[0085] In this step, before conducting a water-conducting fracture zone analysis, a comprehensive understanding of the hydrogeological characteristics of the target mining area is required. This includes understanding basic information such as the lithology, thickness, permeability, groundwater level, as well as the 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, as these structures may affect the development of water-conducting fracture zones.

[0087] According to the hydrogeological characteristics of the target mining area and the 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 an appropriate numerical simulation algorithm, a corresponding numerical model needs to be established. This includes establishing an engineering geophysical conceptual model that 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. This includes simulating the deformation and collapse of the overlying 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 the 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, water-conducting fracture zones refer to water-conducting fissures formed after coal seam mining due to the movement and fracturing of overlying rock strata. These fractures may allow groundwater to flow, posing a threat to coal mine safety. 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 treatment 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 the cracks in the coal seam roof or aquifer 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: grouting treatment is performed on the post-mining coal seam roof according to the target grouting treatment strategy.

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

[0103] Through the above scheme, the post-mining coal seam roof water hazard treatment problem was addressed by comprehensively considering the geological parameters and stratigraphic distribution parameters of the target mining area, achieving a precise analysis of the hydrogeological characteristics of the coal seam roof strata. Then, using a distribution feature algorithm and a numerical simulation algorithm, the development height of the water-conducting fracture zone was accurately determined. Furthermore, using a distribution relationship algorithm, the relationship between the water-conducting fracture zone and the hydrogeological characteristics was deeply analyzed. This fully accounted for the differences in different geological conditions. Therefore, grouting treatment according to the target grouting treatment strategy for the post-mining coal seam roof determined based on the distribution relationship significantly improved the targeted water hazard treatment, avoided the problem of poor grouting treatment results due to complex geological conditions, and effectively reduced 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: Perform a geological structure analysis on the stratum where the target mining area is located based on the geological parameters to obtain a geological structure analysis result.

[0106] Step A2: Compare 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 this approach, the collected geological parameters are used to conduct a geological structural analysis of the strata in the target mining area. This analysis aims to understand the structure, morphology, and spatial relationships between the strata, thereby generating geological structural analysis results. These results reveal geological phenomena such as faults, folds, and uplifts within the strata.

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

[0110] Compare the geological structure analysis results with the preset geological structure parameters of different strata to find out the similarities and differences between the target mining area strata and known strata, and thus obtain comparative 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 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 and contact relationship of each stratum.

[0113] Geological parameters, such as mining area geology and hydrogeology data, primarily include data collected from coal mine drilling, drill cores, well logging curves, coal seam thickness, roof rock hardness, and the spatial distribution characteristics and composition of aquicludes and aquicludes. Based on this data, the loose water-bearing bottom interface and the range of weathered bedrock (i.e., stratum distribution parameters) are delineated, allowing for detailed stratum division.

[0114] In some embodiments, step 102 includes:

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

[0116] Step B2: determining the hydrogeological characteristics of the coal seam roof strata in the target mining area based on 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, etc. These parameters are the basis for the subsequent groundwater flow simulation.

[0118] Using the collected stratigraphic parameters, simulations are performed using a groundwater flow model (such as a numerical, analytical, or physical model). This simulation process aims to simulate the flow of groundwater through different stratigraphic layers, including velocity, direction, and flow rate. The results of groundwater flow simulations are used to reflect the dynamic characteristics of the groundwater system.

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

[0120] Analysis of groundwater flow simulation results can further determine the hydrogeological characteristics of the roof strata within the target mining area. These characteristics may include rock permeability, aquifer distribution, and groundwater recharge and discharge conditions. This information is crucial for assessing mining conditions, preventing water disasters, and developing appropriate mining plans.

[0121] For example, stratigraphic distribution parameters include geological and hydrogeological data of the mining area. Hydrogeological characteristics include the specific vertical interbedded distribution patterns of the coal seam roof aquifer and aquiclude, the location of the aquifer and aquiclude, as well as the distribution patterns of the aquifer's strong water-rich areas and the water-rich areas of the aquifer.

[0122] The vertical distribution of the aquifer and impermeable layers in the coal seam roof 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 impermeable layer is analyzed, the position 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, simulate the mining of the stratum where the target mining area is located through the geological feature simulation model to obtain the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum, and use the height of the water-conducting fracture zone and / or the height of the collapse zone of the overlying rock stratum 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 the rock, the recharge and discharge conditions of groundwater, etc.

[0127] Based on the hydrogeological characteristics, a simulation model (i.e., a geological characteristic simulation model) is constructed that reflects the actual geological characteristics of the strata in the target mining area (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., a geological characteristic simulation model) based on the hydrogeological characteristics. This model will be used for subsequent simulations and analyses.

[0128] Before the simulation begins, a mining thickness threshold (i.e., a 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 previously constructed geological model, simulated mining is performed based on a preset mining thickness threshold. This process simulates the deformation and collapse of the overburden 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 water-conducting fracture zones that may form during mining. Water-conducting fracture zones are formed by the collapse and deformation of overlying strata caused by mining, which may affect groundwater flow and mine safety.

[0132] In addition, physical monitoring, numerical simulation and other methods can also be used. Specifically, one or more methods such as the borehole flushing fluid method, microseismic detection, downhole water injection leak detection method or borehole television method can be used for actual measurement, and one or more of FLAC, UDEC, RFPA, 3DEC, ANSYS, and COMSOL software can be used to numerically simulate the height of the 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 further include locations of weathered bedrock and / or locations of unconsolidated aquifers and / or abnormally water-rich areas.

[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 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 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 negative, determining the target grouting treatment strategy for the post-mining coal seam roof 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 aquiclude 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 post-mining coal seam roof 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 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 grouting 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 indicating 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.

[0143] Step E2: In response to the second judgment result being negative, it is determined whether the loose aquifer position overflows and recharges the weathered bedrock position, thereby 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 aquiclude 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, 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.

[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 construction drilling, and the end of the borehole 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 carried out 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. Afterwards, 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.

[0148] If there is no abnormally water-rich area in the water-conducting fracture zone, the target grouting treatment strategy for the coal seam roof after mining is to construct a drilling hole, with the end of the drilling hole located in the weathered bedrock below the loose aquifer, and inject slurry into the weathered bedrock for grouting modification, and construct a curved branch drilling hole. The curved branch drilling hole is located in the aquiclude layer 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, to obtain a fifth judgment result.

[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 aquiclude 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 treatment strategy for the coal seam roof after mining to repair the aquiclude within the height of the water-conducting fracture zone by grouting and recreating 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 conduct curved branch drilling and 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. Then, by controlling the forward direction of the branch drilling, the repaired impermeable bodies are grouted in series to form 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. The curved branch drilling holes 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, it is determined whether the development height of the water-conducting fracture zone enters the weathered bedrock position, and a sixth judgment result is obtained.

[0156] Step G2, in response to the sixth 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 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 to perform 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 aquiclude.

[0159] If not, the target grouting treatment strategy for the coal seam roof after mining is to determine that it is 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 aquiclude.

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

[0161] Step 201: Conduct geological exploration of the mining area and perform detailed division of the strata;

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

[0163] Step 203: Comprehensively analyze the development height of the collapse zone and water-conducting fissures under mining conditions through 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 based on different roof conditions after mining.

[0165] Among them, such as 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 aquiclude 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 aquiclude. After that, by controlling the forward direction of the branch drilling, the repaired aquicludes are grouting in series to make them a whole and form a complete aquiclude.

[0168] like Figure 6As shown, Scheme IV: Carry out curved branch drilling grouting above the collapse zone, implement a dual-gradient grouting scheme of grouting materials (slurry particle size) and grouting pressure to 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 water-rich areas, 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 water-rich areas, 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 water-rich areas, select Scheme II for treatment; ④ When the water-conducting fracture zone develops into the weathered bedrock and the loose aquifer does not overflow and recharge the weathered bedrock aquifer, select Scheme II for treatment. When the water-feeding and water-conducting fracture zones contain water-rich areas, select Scheme III for treatment; ⑤ When the water-conducting fracture zone develops into 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 Schemes I+II for treatment; ⑥ When the water-conducting fracture zone develops into weathered bedrock, the loose aquifer overflows and recharges the weathered bedrock aquifer, and the water-conducting fracture zone contains water-rich areas, select Schemes I+III for treatment; ⑦ When the fracture zone does not enter the weathered bedrock, select Scheme IV for treatment; ⑧ When the fracture zone enters the weathered bedrock, select Schemes I+IV for treatment;

[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-particle grouting material is composed of aggregate-clay-cement-water slurry, and the small-particle 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, the cement-clay-water glass-water slurry is grouted to fill the remaining smaller cracks. The grouting pressure is divided into high and low levels. When injecting large-particle slurry, a low-level grouting pressure is used to control the diffusion range of the slurry while filling larger voids and cracks; when injecting small-particle slurry, a low-level 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 within the water-conducting fracture zone. If not (N), determine that the target grouting treatment strategy for the coal seam roof after mining is no need for targeted treatment. 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 the highly water-rich area of ​​the 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. Then, by controlling the forward direction of the branch drilling, grouting each repaired impermeable body in series to form a whole and form a complete impermeable layer.

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

[0173] Step 208: Determine whether the loose aquifer overflows and recharges the weathered bedrock aquifer. If so, proceed to step 210; otherwise, proceed to step 211.

[0174] Step 209: Determine whether the fracture zone has entered the weathered bedrock. If so (Y), determine that the target grouting strategy for the coal seam roof after mining is to determine that it is ultra-thin bedrock, and adopt Scheme I+IV, that is, construct a drilling hole, with the end of the drilling hole 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 material and grouting pressure, and form a reconstructed aquiclude. If not (N), determine that the target grouting strategy for the coal seam roof after mining is to determine that it is thin bedrock, and adopt Scheme IV, that is, perform curved branch drilling grouting above the collapse zone, implement a dual-gradient grouting scheme of grouting material 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 drilling hole, and the end of the drilling hole 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 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. Afterwards, 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 (N), the target grouting treatment strategy for the post-mining coal seam roof is determined to be I+II, that is, drilling holes with the end of the borehole located in the weathered bedrock below the loose aquifer, injecting slurry into the weathered bedrock for grouting modification, and constructing curved branch boreholes. The curved branch boreholes are located in the aquiclude below the strong water-rich area of ​​the aquifer and within the height of the water-conducting fracture zone. A new complete aquiclude is created 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 perform additional grouting reinforcement when necessary to ensure long-term waterproof effect.

[0177] In addition, the rock layer 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. A hydrochemical analysis is performed on the water in the goaf to determine which water-rich areas are the source of the water inflow. Grouting is then performed to reconstruct the aquiclude at the source. The process is as follows:

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

[0181] Prediction of water-conducting fracture zones and preliminary determination of water-rich area layers;

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

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

[0184] The method for locating the source of water inrush is to use 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 are based on the coupling of hydrochemical field machine learning analysis and hydrodynamic field reverse tracer simulation.

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

[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 the weathered bedrock. The width is taken as 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 R / 2 below the top interface of the water-conducting fracture zone, and the width extends 50m outward in the horizontal direction along the development range of the water-conducting fracture zone.

[0188] Scheme III: Determine the trend line of the aquiclude 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 below the water source area as the boundary of the grouting range.

[0189] Scheme IV: Based on 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 principle of "grouting every 30 meters or so (if a leakage point is encountered, the calculation is repeated 30 meters from the leakage point), grouting at the end of the branch hole, and grouting as leakage occurs" is followed. When no leakage occurs in the entire branch hole, high-pressure grouting is carried out every 30 meters or so after drilling the branch hole.

[0192] Grout Selection: Clay-cement slurry is used in weathered bedrock areas. Clay slurry is the primary component, with small amounts of cement and water glass added. Generally, the volume percentages of the various components in clay-cement slurry are: 90% to 96% clay, 3% to 6% cement, and 1.5% to 3% water glass.

[0193] Cement grouting is used in the water-conducting fracture zone. ① In the normal section (loss rate less than 3 m³ / h), the water-cement ratio is started at 3:1 (specific gravity 1.2). When the wellhead pressure does not rise, the concentration is gradually increased to 2.5:1, 2:1, 1.5:1, and 1:1. After the wellhead pressure rises steadily and reaches the grouting end pressure standard, 3:1 slurry is used to continue grouting at a steady pressure to obtain grouting parameters. ② In the weak leakage section (loss rate > 3 m³ / h and not completely lost), the water-cement ratio is started at 3:1 or 2:1 (depending on the leakage situation). When the wellhead pressure does not rise, the concentration is gradually increased to 2.5:1, 2:1, and 1:1. Intermittent grouting is also considered as an alternative. ③ In the strong leakage section (completely lost), the water-cement ratio is started at 2:1 and gradually increased to 1:1. Accelerators and intermittent grouting are also considered as alternatives.

[0194] Grouting end standards: This design has two grouting end standards: 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 30 minutes (including 30 minutes); 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 in a distributed scenario and performed by multiple devices working together. In such a distributed scenario, one of the multiple devices may only perform one or more steps of the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the method.

[0196] It should be noted that the above description is limited to some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in an order different from that described in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain 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 aquiclude reconstruction device for the roof coal-bearing aquifer.

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

[0199] An acquisition module 801 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;

[0200] A feature analysis module 802 is configured to perform feature analysis processing based on the stratum distribution parameters using a distribution feature algorithm to determine the hydrogeological characteristics 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 based on the hydrogeological characteristics by using a numerical simulation algorithm to determine the development height of the water-conducting fracture zone;

[0202] a distribution relationship analysis module 804 configured to perform a distribution relationship analysis based on the height of the water-conducting fracture zone and the hydrogeological characteristics using a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determine a target grouting treatment strategy for the post-mining coal seam roof 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] Performing a geological structural analysis on the stratum where the target mining area is located based on the geological parameters to obtain a geological structural analysis result;

[0206] Comparing the 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 stratum distribution parameters of the target mining area.

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

[0209] Performing groundwater flow simulation based on the stratum 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 to:

[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 indicating that the height of the water-conducting fracture zone is not within the weathered bedrock, determining whether there is an abnormally water-rich area within the height of the water-conducting fracture zone, and obtaining a first determination result;

[0218] In response to the first judgment result being no, determining the target grouting treatment strategy for the post-mining coal seam roof 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 aquiclude 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 aquiclude reconstruction device for the roof coal-bearing aquifer further includes a first grouting management strategy determination module. After determining the distribution relationship based on 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 to:

[0221] In response to the distribution relationship indicating that the height of the water-conducting fracture zone is located inside the weathered bedrock, determining 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 the weathered bedrock position, thereby obtaining a third judgment result;

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

[0224] In response to the fourth judgment result being yes, determining the target grouting treatment strategy for the post-mining coal seam roof as grouting the weathered bedrock position, and performing curved branch drilling grouting in the aquiclude in each highly water-rich area of ​​the aquifer 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 aquiclude reconstruction device for the roof coal-bearing aquifer further includes a second grouting management strategy determination module. In response to the second judgment result being negative, it is determined whether the loose aquifer position overflows and recharges the weathered bedrock position. After obtaining the third judgment result, the second grouting management strategy determination module is specifically configured to:

[0227] In response to the third judgment result being no, determining whether there is an abnormally water-rich area within 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 post-mining coal seam roof to be performing curved branch drilling grouting in the aquiclude in each aquifer in a highly water-rich area within the height of the water-conducting fracture zone;

[0229] In response to the fifth judgment result being no, the target grouting treatment 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 aquiclude reconstruction device for the roof coal-bearing aquifer further includes a third grouting management strategy determination module. In response to the distribution relationship indicating that the height of the water-conducting fracture zone is located within the weathered bedrock, the module determines whether the height of the water-conducting fracture zone is located at the position of the loose aquifer. After obtaining the second judgment result, the module is specifically configured to:

[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 post-mining coal seam roof to be grouting at the weathered bedrock position, and performing curved branch drilling grouting at 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 performing 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 devices are described as being divided into various modules according to their functions. Of course, when implementing this 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 aquiclude 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.

[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 runnable on the processor. When the processor executes the program, it implements the post-mining zoned grouting aquiclude reconstruction method for the roof coal-bearing aquifer described in any of the above embodiments.

[0237] Figure 9 A more specific hardware structure diagram of an electronic device provided in this embodiment is shown. 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 communicatively connected to each other within the device via the bus 905.

[0238] The processor 901 can be implemented using 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 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage devices, dynamic storage devices, etc. The memory 902 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 902 and called and executed by the processor 901.

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

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

[0242] The bus 905 comprises a path for transmitting information between the 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 the processor 901, the memory 902, the input / output interface 903, the communication interface 904, and the bus 905, in a specific implementation, the device may also include other components necessary for normal operation. In addition, it will be understood by those skilled in the art that the above device may only include the components necessary to implement the embodiments of this 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 zoning grouting aquiclude 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, which stores computer instructions, and the computer instructions are used to enable the computer to execute the post-mining zoned grouting aquiclude reconstruction method of the roof coal-bearing aquifer as described in any of the above embodiments.

[0246] The computer-readable media of this embodiment include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. The information can be computer-readable instructions, data structures, program modules 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 disc read-only memory (CD-ROM), digital versatile disc (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 post-mining zoning grouting aquiclude reconstruction method for 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] Those 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 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, for simplicity of description and discussion, and in order not to make the embodiment of the application difficult to understand, the known power supply / ground connection with integrated circuit (IC) chip and other components may or may not be shown in the accompanying drawings provided. In addition, the device can be shown in the form of a block diagram to avoid making the embodiment of the application difficult to understand, and this also takes into account the following fact, that is, the details of the embodiment of these block diagram devices are highly dependent on the platform to be implemented in the embodiment of the application (that is, these details should be fully within the scope of understanding of those skilled in the art). When specific details (for example, circuit) are set forth to describe exemplary embodiments of the application, it will be apparent to those skilled in the art that the embodiment of the 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 invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may utilize 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 scope of protection 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: Acquiring geological parameters of a target mining area, and determining stratum distribution parameters of the target mining area based on the geological parameters; Based on the stratum distribution parameters, characteristic analysis is performed 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; performing a distribution relationship analysis based on the height of the water-conducting fracture zone and the hydrogeological characteristics using a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determining a target grouting treatment strategy for the post-mining coal seam roof based on the distribution relationship; Performing grouting treatment on the post-mining coal seam roof according to the target grouting treatment strategy; The hydrogeological characteristics also include the location of weathered bedrock and / or the location of unconsolidated aquifers and / or areas of abnormally high water content; The method further comprises: performing a distribution relationship analysis based on the height of the water-conducting fracture zone and the hydrogeological characteristics using a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determining a target grouting treatment strategy for the post-mining coal seam roof based on the distribution relationship, including: 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 indicating that the height of the water-conducting fracture zone is not within the weathered bedrock, determining whether there is an abnormally water-rich area within the height of the water-conducting fracture zone, and obtaining a first determination result; In response to the first judgment result being no, determining the target grouting treatment strategy for the post-mining coal seam roof as no grouting treatment required; In response to the first judgment result being yes, determining that the target grouting treatment strategy for the post-mining coal seam roof is to perform 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; After determining the distribution relationship based on 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 indicating that the height of the water-conducting fracture zone is located inside the weathered bedrock, determining 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 the weathered bedrock position, thereby obtaining a third judgment result; In response to the third judgment result being yes, determining whether there is an abnormally water-rich area within the water-conducting fracture zone development height, and obtaining a fourth judgment result; In response to the fourth judgment result being yes, determining the target grouting treatment strategy for the post-mining coal seam roof as grouting the weathered bedrock position, and performing curved branch drilling grouting in the aquiclude in each highly water-rich area of ​​the aquifer within the height of the water-conducting fracture zone; In response to the fourth judgment result being negative, determining the target grouting treatment strategy for the post-mining coal seam roof to be grouting the weathered bedrock position, and grouting the aquiclude within the height of the water-conducting fracture zone development, and recreating the aquiclude; In response to the second judgment result being negative, determining whether the loose aquifer location overflows and recharges the weathered bedrock location, and 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 within 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 post-mining coal seam roof to be performing curved branch drilling grouting in the aquiclude in each aquifer in a highly water-rich area within the height of the water-conducting fracture zone; In response to the fifth judgment result being no, the target grouting treatment 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.

2. The method according to claim 1, characterized in that Determining the stratum distribution parameters of the target mining area based on the geological parameters includes: Performing a geological structural analysis on the stratum where the target mining area is located based on the geological parameters to obtain a geological structural analysis result; Comparing the 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 stratum 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 stratum distribution parameters by using a distribution characteristic algorithm to determine the hydrogeological characteristics of the coal seam roof stratum in the target mining area includes: Performing groundwater flow simulation based on the stratum 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, wherein The analyzing and processing of 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, wherein In response to the distribution relationship indicating that the height of the water-conducting fracture zone is located within the weathered bedrock, determining 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 post-mining coal seam roof to be grouting at the weathered bedrock position, and performing curved branch drilling grouting at 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 performing curved branch drilling grouting in the collapse zone with a high degree of development of the water-conducting fracture zone.

6. A post-mining grouting and water-proof layer reconstruction device for roof coal-bearing aquifers, characterized in that: include: an acquisition module 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 configured to perform feature analysis processing based on the stratum distribution parameters using 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 configured to perform water-conducting fracture zone analysis based on the hydrogeological characteristics using a numerical simulation algorithm to determine the development height of the water-conducting fracture zone; a distribution relationship analysis module configured to perform distribution relationship analysis based on the height of the water-conducting fracture zone and the hydrogeological characteristics using a distribution relationship algorithm to obtain a distribution relationship between the height of the water-conducting fracture zone and the hydrogeological characteristics, and determine a target grouting treatment strategy for the post-mining coal seam roof based on the distribution relationship; A grouting treatment module is configured to perform grouting treatment on the post-mining coal seam roof according to the target grouting treatment strategy; The hydrogeological characteristics also include the location of weathered bedrock and / or the location of unconsolidated aquifers and / or areas of abnormally high water content; The distribution relationship analysis module is specifically configured to: 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 indicating that the height of the water-conducting fracture zone is not within the weathered bedrock, determining whether there is an abnormally water-rich area within the height of the water-conducting fracture zone, and obtaining a first determination result; In response to the first judgment result being no, determining the target grouting treatment strategy for the post-mining coal seam roof as no grouting treatment required; In response to the first judgment result being yes, determining that the target grouting treatment strategy for the post-mining coal seam roof is to perform 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; 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 based on the development height of the water-conducting fracture zone and the position of the weathered bedrock, the first grouting management strategy determination module is specifically configured to: In response to the distribution relationship indicating that the height of the water-conducting fracture zone is located inside the weathered bedrock, determining 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 the weathered bedrock position, thereby obtaining a third judgment result; In response to the third judgment result being yes, determining whether there is an abnormally water-rich area within the water-conducting fracture zone development height, and obtaining a fourth judgment result; In response to the fourth judgment result being yes, determining the target grouting treatment strategy for the post-mining coal seam roof as grouting the weathered bedrock position, and performing curved branch drilling grouting in the aquiclude in each highly water-rich area of ​​the aquifer within the height of the water-conducting fracture zone; In response to the fourth judgment result being negative, determining the target grouting treatment strategy for the post-mining coal seam roof to be grouting the weathered bedrock position, and grouting the aquiclude within the height of the water-conducting fracture zone development, and recreating the aquiclude; The post-mining zone grouting aquiclude reconstruction device for the roof coal-bearing aquifer further includes a second grouting management strategy determination module. In response to the second judgment result being negative, the module determines whether the loose aquifer position overflows and recharges the weathered bedrock position. After obtaining the third judgment result, the module is specifically configured to: In response to the third judgment result being no, determining whether there is an abnormally water-rich area within 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 post-mining coal seam roof to be performing curved branch drilling grouting in the aquiclude in each aquifer in a highly water-rich area within the height of the water-conducting fracture zone; In response to the fifth judgment result being no, the target grouting treatment 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.

7. 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 5 is implemented.

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