Mine goaf fissure identification method, device and equipment and storage medium

Abstract

The embodiment discloses a crack identification method, device and equipment for a mine goaf and a storage medium. The method comprises the following steps: obtaining a target monitoring layer of the mine goaf, the target monitoring layer being used for indicating a target working face for identifying cracks; drilling a drill nest in a roadway of the target working face and arranging a plurality of groups of detection holes for monitoring crack development dynamics; performing single-hole detection and multi-hole parallel detection on the plurality of groups of detection holes to obtain dynamic change data of apparent resistivity values of the plurality of groups of detection holes; determining a low-resistance area of the target working face, wherein the low-resistance area is used for indicating a region with a reduced apparent resistivity value; obtaining microseismic event positions, energies and frequencies generated by the low-resistance area during construction of the directional drill hole; and identifying crack development dynamics of the target working face based on the microseismic event positions, energies and frequencies. The method can realize dynamic real-time monitoring and identification of the crack development form with high accuracy, thereby saving time and labor costs.

Description

Technical Field

[0001] This disclosure relates to the field of coal mining technology, and in particular to a method, apparatus, equipment and storage medium for identifying fractures in goaf areas of mines. Background Technology

[0002] After coal mining, numerous goaf areas are formed at different mining levels. As the disturbance to the overlying strata ceases, the goaf areas tend to stabilize, forming large void spaces. Due to the low permeability of the floor, these spaces provide space for mine water storage. However, because the overlying strata of abandoned mine goaf areas contain fracture zones caused by mining, they possess strong conductivity. For goaf areas with poor sealing and stability, it is difficult to meet the requirements for water storage reservoirs.

[0003] In related technologies, the detection of cracks in mine goaf mainly adopts geophysical exploration methods and geological drilling methods. Due to the strong shielding effect of the goaf and the volume effect of the geophysical field, the structural interpretation of the bottom plate is difficult, which also causes the spatial range error of the mine goaf to be large, resulting in low accuracy of crack detection and a lot of time and human resources costs. Summary of the Invention

[0004] In view of this, the present disclosure provides a method, apparatus, equipment and storage medium for identifying fractures in goaf areas of mines. By using the directional borehole apparent resistivity method and microseismic monitoring method to continuously detect and analyze the development of fractures in the target monitoring layer of the goaf area, dynamic real-time monitoring and identification of fracture development morphology can be achieved, improving the accuracy of dynamic detection of fracture development, saving time and labor costs, and providing effective geological data for grouting transformation of goaf areas.

[0005] In a first aspect, the present disclosure provides a method for identifying fractures in a mine goaf, employing the following technical solution:

[0006] Obtain a target monitoring layer for a goaf in a mine, the target monitoring layer indicating a target working face in the goaf for identifying cracks;

[0007] Downhole directional drilling was used to construct drill holes in the roadway of the target working face, and several sets of detection holes were arranged to monitor the dynamic development of the fractures.

[0008] Single-hole detection and multi-hole parallel detection are performed on the several sets of detection holes to obtain dynamic change data of the apparent resistivity values ​​of the several sets of detection holes;

[0009] Based on the dynamic change data of the apparent resistivity values ​​of the several sets of probe holes, the low-resistivity region of the target working surface is determined, wherein the low-resistivity region is used to indicate the area where the apparent resistivity value decreases.

[0010] The location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling were obtained.

[0011] Based on the location, energy, and frequency of the microseismic events, the dynamics of crack development on the target working face are identified.

[0012] In some embodiments, single-hole detection and multi-hole parallel detection are performed on the plurality of sets of detection holes to obtain dynamic change data of the apparent resistivity values ​​of the plurality of sets of detection holes, including:

[0013] Electrodes are arranged in the plurality of sets of probe holes;

[0014] Longitudinal surface imaging of each of the several groups of probe holes is performed by the borehole resistivity method, and volume imaging of at least two of the several groups of probe holes is performed.

[0015] The electrode values ​​of the plurality of probe holes are obtained, and statistical analysis is performed on the electrode values ​​of the plurality of probe holes.

[0016] Based on the statistical analysis results of the electrode values ​​of the aforementioned probe holes, dynamic change data of the apparent resistivity values ​​of the aforementioned probe holes are obtained.

[0017] In some embodiments, obtaining the location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling includes:

[0018] A micro-vibration detector is arranged in the detection hole in the low-resistivity region;

[0019] The location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling were obtained using microseismic sensors.

[0020] In some embodiments, based on the location, energy, and frequency of the microseismic events, the dynamics of fracture development on the target working face are identified, including:

[0021] Based on the location, energy, and frequency of the microseismic events, the fracture development patterns, fracture morphology, fracture zone development height, and fracture development depth in the low-resistivity zone of the target working face are identified and analyzed.

[0022] In some embodiments, the method further includes:

[0023] A pumping test was conducted on the goaf of the mine to obtain the pumping test results, wherein the pumping test refers to pumping water from the goaf of the mine to the upper reservoir;

[0024] Based on the results of the pumping test, the dynamic change data of the apparent resistivity value, and the location, energy, and frequency of the microseismic events, the stability of the low-resistivity zone is evaluated.

[0025] In some embodiments, the method further includes:

[0026] A water release test was conducted on the goaf of the mine to obtain the test results. The water release test refers to releasing water from the upper reservoir to the lower reservoir.

[0027] Based on the results of the water release test, the dynamic change data of the apparent resistivity value, and the location, energy, and frequency of the microseismic events, the location of the crack activation zone is determined.

[0028] Based on the location of the fracture activation zone, the stable water pressure point of the target monitoring layer in the goaf of the mine is determined.

[0029] In some embodiments, the method further includes:

[0030] Calculate the stable value of the stable water pressure point of the target monitoring layer;

[0031] Based on the stable value of the stable water pressure point of the target monitoring layer and the location of the fracture activation zone, the bearing capacity and stability of the mine goaf are predicted.

[0032] Secondly, this disclosure also provides a fracture identification device for goaf areas in mines, employing the following technical solution:

[0033] A target monitoring layer acquisition unit is configured to acquire a target monitoring layer of a mine goaf, the target monitoring layer indicating a target working face of the mine goaf for identifying cracks;

[0034] The detection hole arrangement unit is configured to construct drill holes in the roadway of the target working face using downhole directional drilling, and to arrange several sets of detection holes for monitoring the dynamic development of the fractures.

[0035] The detection unit is configured to perform single-hole detection and multi-hole parallel detection on the plurality of detection holes to obtain dynamic change data of the apparent resistivity values ​​of the plurality of detection holes.

[0036] The determining unit is configured to determine the low-resistivity region of the target working surface based on the dynamic change data of the apparent resistivity values ​​of the plurality of probe holes, wherein the low-resistivity region is used to indicate the area where the apparent resistivity value decreases.

[0037] The microseismic event acquisition unit is configured to acquire the location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling.

[0038] The crack identification unit is configured to identify the dynamic development of cracks in the target working face based on the location, energy, and frequency of the microseismic event.

[0039] Thirdly, this disclosure also provides an electronic device that adopts the following technical solution:

[0040] The electronic device includes:

[0041] At least one processor; and,

[0042] A memory communicatively connected to the at least one processor; wherein,

[0043] The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform any of the above-described methods for identifying fractures in goaf areas.

[0044] Fourthly, embodiments of this disclosure also provide a computer-readable storage medium storing computer instructions for causing a computer to execute any of the above-described methods for identifying fractures in goaf areas.

[0045] This disclosure provides a method for identifying fractures in mine goaf areas. By employing directional borehole apparent resistivity method and microseismic monitoring method, the method continuously detects and analyzes the development of fractures in the target monitoring layer of the mine goaf area. This enables dynamic real-time monitoring and identification of fracture development morphology, improves the accuracy of dynamic detection of fracture development, saves time and labor costs, and provides effective geological data for grouting transformation of goaf areas.

[0046] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A schematic flowchart illustrating a method for identifying fractures in a mine goaf provided in this embodiment of the present disclosure;

[0049] Figure 2 This is a perspective view of directional drilling provided in an embodiment of the present disclosure;

[0050] Figure 3This is a schematic diagram of the trajectory planar distribution of directional drilling provided in an embodiment of this disclosure;

[0051] Figure 4 A schematic diagram of the structure of a fracture identification device for goaf areas in a mine, provided in an embodiment of this disclosure;

[0052] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. Detailed Implementation

[0053] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0054] It should be understood that the following specific examples illustrate the implementation of this disclosure, and those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure.

[0055] It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0056] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0057] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The drawings only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0058] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0059] Figure 1 This is a flowchart illustrating a method for identifying fractures in a mine goaf according to an embodiment of the present disclosure. The method includes the following steps:

[0060] S101. Obtain the target monitoring layer of the goaf in the mine. The target monitoring layer indicates the target working face of the goaf used to identify cracks.

[0061] For example, the target monitoring layer could be the floor of a mine goaf, which also includes the coal seam and roof.

[0062] S102. Drilling holes are constructed in the roadway of the target working face using downhole directional drilling, and several sets of detection holes are arranged to monitor the dynamic development of fractures.

[0063] See details Figure 2 , Figure 3 , Figure 2 This is a perspective view of directional drilling. The probe holes are numbered 1 to 12. The number and shape of the probe holes can be set according to actual business needs. This embodiment does not limit this. Figure 3 This is a schematic diagram of the directional drilling trajectory in plan view. The tunnels include transport tunnels and intake air tunnels.

[0064] S103. Perform single-hole detection and multi-hole parallel detection on several sets of detection holes to obtain dynamic change data of the apparent resistivity values ​​of several sets of detection holes.

[0065] S104. Based on the dynamic change data of the apparent resistivity values ​​of several sets of probe holes, determine the low-resistivity region of the target working surface, wherein the low-resistivity region is used to indicate the area where the apparent resistivity value decreases.

[0066] S105. Obtain the location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling.

[0067] S106. Based on the location, energy, and frequency of microseismic events, the dynamics of crack development on the target working face are identified.

[0068] This disclosure provides a method for identifying fractures in mine goaf areas. By employing directional borehole apparent resistivity method and microseismic monitoring method, the method continuously detects and analyzes the development of fractures in the target monitoring layer of the mine goaf area. This enables dynamic real-time monitoring and identification of fracture development morphology, improves the accuracy of dynamic detection of fracture development, saves time and labor costs, and provides effective geological data for grouting transformation of goaf areas.

[0069] In some embodiments, single-hole detection and multi-hole parallel detection are performed on several sets of probe holes to obtain dynamic change data of the apparent resistivity values ​​of several sets of probe holes, including:

[0070] Electrodes are arranged in several sets of probe holes;

[0071] Longitudinal surface imaging of each of several groups of probe holes is performed by the borehole resistivity method, and volumetric imaging of at least two probe holes in several groups of probe holes is performed.

[0072] Obtain the electrode values ​​of several probe holes and perform statistical analysis on the electrode values ​​of several probe holes;

[0073] Based on the statistical analysis of the electrode values ​​of several probe holes, dynamic change data of the apparent resistivity values ​​of several probe holes were obtained.

[0074] Optionally, due to prolonged abandonment, mine goafs often become filled with water, and the water pressure on the floor strata can lead to strata damage. When the mechanical properties of the rock change, the electrical properties of the strata also change significantly. Since the resistivity of a rock stratum is mainly determined by the resistivity of fissures and their filling materials, when fissures are well-developed, the primary fissures reduce the resistivity; conversely, when the strata are intact, the resistivity is relatively high. According to geoelectric field exploration theory, the resistivity of a rock mass determines its apparent resistivity; therefore, the development of fissures can be monitored using exploration methods that utilize dynamic changes in apparent resistivity data.

[0075] In some embodiments, obtaining the location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling includes:

[0076] Microseismic detectors are placed in the probe holes in the low-resistivity region;

[0077] The location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling were obtained using microseismic sensors.

[0078] In some embodiments, the dynamics of fracture development at the target working face are identified based on the location, energy, and frequency of microseismic events, including:

[0079] Based on the location, energy, and frequency of microseismic events, the development patterns, morphology, fracture height, and depth of fractures in the low-resistivity zone of the target working face are identified and analyzed.

[0080] During directional drilling, rocks fracture, accompanied by microseismic events. When vertically developed fractures are encountered, the location of microseismic events expands, and the energy value at these locations is greater than that at locations without anomalies in conventional drilling. Simultaneously, the frequency of microseismic events increases. Abnormal low-resistivity zones are identified based on the location, energy, and frequency of microseismic events monitored. Typically, the location of fractures in low-resistivity zones is determined by enveloping the microseismic events. Furthermore, the degree of fracture connectivity is determined based on the energy and frequency of the microseismic events, and the overall properties of the fracture zone are comprehensively assessed by combining these factors with the detection data of the low-resistivity zone.

[0081] Optionally, the location, energy, and frequency of microseismic events are used to indicate the degree of damage caused by microseismic events to the cracks in the floor of the goaf.

[0082] Optionally, when the fractures continue to develop under water pressure, the embodiments of this disclosure employ a borehole microseismic monitoring method and a directional borehole resistivity method to continuously couple and analyze the dynamic development of fractures in the floor of the mine goaf, and conduct water pumping tests to test the bearing capacity of the mine goaf and evaluate the fracture activation zone, thereby improving the accuracy of dynamic detection of fracture development and providing effective geological data for grouting modification of the mine goaf.

[0083] In some embodiments, the method further includes:

[0084] A pumping test was conducted on the goaf of the mine to obtain the results. The pumping test refers to pumping water from the goaf of the mine to the reservoir.

[0085] The stability of the low-resistivity zone is assessed based on the results of pumping tests, dynamic changes in apparent resistivity, and the location, energy, and frequency of microseismic events.

[0086] Optionally, the stability of the low-resistivity region can be evaluated, for example, by determining that the low-resistivity region is relatively stable when the resistance within the detection area of ​​the low-resistivity region is relatively stable and the micro-vibration signal transmission of the micro-vibration sensor is stable and no relatively large number of vibration signals are observed in the pumping and draining test.

[0087] In some embodiments, the method further includes:

[0088] A water release test was conducted on the goaf of the mine to obtain the test results. The water release test refers to releasing water from the upper reservoir to the lower reservoir.

[0089] Based on the results of the water discharge test, the dynamic change data of apparent resistivity, and the location, energy, and frequency of microseismic events, the location of the crack activation zone was determined.

[0090] Based on the location of the fracture activation zone, the stable water pressure point of the target monitoring layer in the goaf of the mine is determined.

[0091] In some embodiments, the method further includes:

[0092] Calculate the stable value of the stable water pressure point at the target monitoring layer;

[0093] Based on the stable value of the stable water pressure point of the target monitoring layer and the location of the fracture activation zone, the bearing capacity and stability of the goaf in the mine are predicted.

[0094] This disclosure provides geological data for subsequent grouting and modification of the goaf by determining the stability of the goaf floor and the location of the fracture activation zone. Assessing the bearing capacity of the floor floor can provide scientific guidance for the construction of subsequent underground reservoirs.

[0095] Figure 4 This is a schematic diagram of a fracture identification device for goaf areas provided in an embodiment of the present disclosure. The fracture identification device for goaf areas provided in an embodiment of the present disclosure includes:

[0096] The target monitoring layer acquisition unit 41 is configured to acquire the target monitoring layer of the goaf in the mine, which indicates the target working face of the goaf used to identify cracks.

[0097] The detection hole arrangement unit 42 is configured to construct drill holes in the roadway of the target working face using downhole directional drilling, and to arrange several sets of detection holes for monitoring the dynamic development of fractures.

[0098] The detection unit 43 is configured to perform single-hole detection and multi-hole parallel detection on several sets of detection holes to obtain dynamic change data of the apparent resistivity values ​​of several sets of detection holes.

[0099] The determining unit 44 is configured to determine the low-resistivity region of the target working surface based on the dynamic change data of the apparent resistivity values ​​of several sets of probe holes, wherein the low-resistivity region is used to indicate the area where the apparent resistivity value decreases.

[0100] The microseismic event acquisition unit 45 is configured to acquire the location, energy, and frequency of microseismic events generated in the low-resistivity zone during the construction of the directional drilling.

[0101] The crack identification unit 46 is configured to identify the dynamic development of cracks on the target working face based on the location, energy and frequency of microseismic events.

[0102] An electronic device according to embodiments of the present disclosure includes a memory and a processor. The memory is used to store non-transitory computer-readable instructions. Specifically, the memory may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may, for example, include random access memory (RAM) and / or cache memory. The non-volatile memory may, for example, include read-only memory (ROM), a hard disk, flash memory, etc.

[0103] The processor may be a central processing unit (CPU) or other form of processing unit with data processing power and / or instruction execution power, and may control other components in the electronic device to perform desired functions. In one embodiment of this disclosure, the processor is used to run computer-readable instructions stored in the memory, causing the electronic device to perform all or part of the steps of the mine goaf identification method described in the foregoing embodiments of this disclosure.

[0104] Those skilled in the art will understand that, in order to solve the technical problem of how to achieve a good user experience, this embodiment may also include well-known structures such as communication buses and interfaces, and these well-known structures should also be included within the protection scope of this disclosure.

[0105] like Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present disclosure. It illustrates a structural schematic diagram suitable for implementing the electronic device in the embodiment of the present disclosure. Figure 5 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments disclosed herein.

[0106] like Figure 5 As shown, an electronic device may include a processor (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes based on a program stored in read-only memory (ROM) or a program loaded from a storage device into random access memory (RAM). The RAM also stores various programs and data required for the operation of the electronic device. The processor, ROM, and RAM are interconnected via a bus. Input / output (I / O) interfaces are also connected to the bus.

[0107] Typically, the following devices can be connected to the I / O interface: input devices, such as sensors or visual information acquisition devices; output devices, such as displays; storage devices, such as magnetic tapes or hard drives; and communication devices. Communication devices allow electronic devices to communicate wirelessly or wiredly with other devices (such as edge computing devices) to exchange data. Although Figure 5Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown. More or fewer devices may be implemented or have instead.

[0108] In particular, according to embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this disclosure include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from a storage device, or installed from a ROM. When the computer program is executed by a processor, all or part of the steps of the fracture identification method for goaf areas according to embodiments of this disclosure are performed.

[0109] For a detailed description of this embodiment, please refer to the corresponding descriptions in the foregoing embodiments, which will not be repeated here.

[0110] A computer-readable storage medium according to embodiments of the present disclosure stores non-transitory computer-readable instructions thereon. When the non-transitory computer-readable instructions are executed by a processor, all or part of the steps of the fracture identification method for goaf areas in the foregoing embodiments of the present disclosure are performed.

[0111] The aforementioned computer-readable storage media include, but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or portable hard drive), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

[0112] For a detailed description of this embodiment, please refer to the corresponding descriptions in the foregoing embodiments, which will not be repeated here.

[0113] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0114] In this disclosure, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The block diagrams of devices, apparatuses, devices, and systems involved in this disclosure are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as "comprising," "including," "having," etc., are open-ended terms meaning "including but not limited to," and are used interchangeably with them. The terms "or" and "and" as used herein refer to the terms "and / or," and are used interchangeably with them unless the context clearly indicates otherwise. The term "such as" as used herein refers to the phrase "such as but not limited to," and is used interchangeably with it.

[0115] Additionally, as used herein, the “or” used in a list of items beginning with “at least one” indicates a separate list, such that a list of, for example, “at least one of A, B, or C” means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). Furthermore, the word “exemplary” does not imply that the described example is preferred or better than other examples.

[0116] It should also be noted that in the systems and methods of this disclosure, the components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions to this disclosure.

[0117] Various changes, substitutions, and modifications can be made to the technology described herein without departing from the teachings defined by the appended claims. Furthermore, the scope of the claims of this disclosure is not limited to the specific aspects of the processes, machines, manufactures, events, means, methods, and actions described above. Currently existing or later-developed processes, machines, manufactures, events, means, methods, or actions that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Therefore, the appended claims include such processes, machines, manufactures, events, means, methods, or actions within their scope.

[0118] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of this disclosure. Therefore, this disclosure is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0119] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A method for identifying fractures in a mine goaf, characterized in that, include: Obtain a target monitoring layer for a goaf in a mine, the target monitoring layer indicating a target working face in the goaf for identifying cracks; Downhole directional drilling was used to construct drill holes in the roadway of the target working face, and several sets of detection holes were arranged to monitor the dynamic development of the fractures. Single-hole detection and multi-hole parallel detection are performed on the several sets of detection holes to obtain dynamic change data of the apparent resistivity values ​​of the several sets of detection holes; Based on the dynamic change data of the apparent resistivity values ​​of the aforementioned sets of probe holes, the low-resistivity region of the target working surface is determined; wherein, the low-resistivity region is used to indicate the area where the apparent resistivity value decreases. The location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling were obtained. Based on the location, energy, and frequency of the microseismic events, the dynamic development of cracks in the target working face is identified. Specifically, by enveloping the location of the microseismic events, the location of cracks in the low-resistivity zone is determined. The degree of connectivity of cracks in the low-resistivity zone is distinguished according to the magnitude of the energy and frequency of the microseismic events. The relevant attributes of the crack zone are comprehensively judged in conjunction with the detection situation of the low-resistivity zone.

2. The method for identifying fractures in a mine goaf according to claim 1, characterized in that, Single-hole detection and multi-hole parallel detection are performed on the several sets of detection holes to obtain dynamic change data of the apparent resistivity values ​​of the several sets of detection holes, including: Electrodes are arranged in the plurality of sets of probe holes; Longitudinal surface imaging of each of the several groups of probe holes is performed by the borehole resistivity method, and volume imaging of at least two of the several groups of probe holes is performed. The electrode values ​​of the plurality of probe holes are obtained, and statistical analysis is performed on the electrode values ​​of the plurality of probe holes. Based on the statistical analysis results of the electrode values ​​of the aforementioned probe holes, dynamic change data of the apparent resistivity values ​​of the aforementioned probe holes are obtained.

3. The method for identifying fractures in a mine goaf according to claim 1, characterized in that, Acquiring the location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling, including: A micro-vibration detector is arranged in the detection hole in the low-resistivity region; The location, energy, and frequency of microseismic events generated in the low-resistivity zone during directional drilling are obtained using the microseismic sensor.

4. The method for identifying fractures in a mine goaf according to claim 1, characterized in that, Based on the location, energy, and frequency of the microseismic events, the dynamics of fracture development on the target working face are identified, including: Based on the location, energy, and frequency of the microseismic events, the fracture development patterns, fracture morphology, fracture zone height, and fracture depth in the low-resistivity zone of the target working face are identified and analyzed.

5. The method for identifying fractures in a mine goaf according to claim 1, characterized in that, The method further includes: A pumping test was conducted on the goaf of the mine to obtain the pumping test results, wherein the pumping test refers to pumping water from the goaf of the mine to the upper reservoir; Based on the results of the pumping test, the dynamic change data of the apparent resistivity value, and the location, energy, and frequency of the microseismic events, the stability of the low-resistivity zone is evaluated.

6. The method for identifying fractures in a mine goaf according to claim 1, characterized in that, The method further includes: A water release test was conducted on the goaf of the mine to obtain the test results. The water release test refers to releasing water from the upper reservoir to the lower reservoir. Based on the results of the water release test, the dynamic change data of the apparent resistivity value, and the location, energy, and frequency of the microseismic events, the location of the crack activation zone is determined. Based on the location of the fracture activation zone, the stable water pressure point of the target monitoring layer in the goaf of the mine is determined.

7. The method for identifying fractures in a mine goaf according to claim 6, characterized in that, The method further includes: Calculate the stable value of the stable water pressure point of the target monitoring layer; Based on the stable value of the stable water pressure point of the target monitoring layer and the location of the fracture activation zone, the bearing capacity and stability of the mine goaf are predicted.

8. A fracture identification device for goaf areas in mines, characterized in that, include: A target monitoring layer acquisition unit is configured to acquire a target monitoring layer of a mine goaf, the target monitoring layer indicating a target working face of the mine goaf for identifying cracks; The detection hole arrangement unit is configured to construct drill holes in the roadway of the target working face using downhole directional drilling, and to arrange several sets of detection holes for monitoring the dynamic development of the fractures. The detection unit is configured to perform single-hole detection and multi-hole parallel detection on the plurality of detection holes to obtain dynamic change data of the apparent resistivity values ​​of the plurality of detection holes. The determining unit is configured to determine the low-resistivity region of the target working surface based on the dynamic change data of the apparent resistivity values ​​of the plurality of probe holes, wherein the low-resistivity region is used to indicate the area where the apparent resistivity value decreases. The microseismic event acquisition unit is configured to acquire the location, energy, and frequency of microseismic events generated in the low-resistivity zone during the construction of the directional drilling. The crack identification unit is configured to identify the dynamic development of cracks in the target working face based on the location, energy, and frequency of the microseismic events. Specifically, it determines the location of cracks in the low-resistivity zone by enveloping the location of the microseismic events, distinguishes the connectivity of cracks in the low-resistivity zone based on the magnitude of the energy and frequency of the microseismic events, and comprehensively judges the relevant attributes of the crack zone by combining the detection situation of the low-resistivity zone.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the method for identifying fractures in goaf areas as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to perform the method for identifying fractures in goaf areas as described in any one of claims 1 to 7.

Images