Advanced Fine Detection Method and Equipment for Gas-Geological Anomaly in Mining Face

Abstract

The present invention provides a method and equipment for advanced fine detection of gas geological anomalies in an excavation working face. By using the in-situ measurement method of the relative dielectric constant of coal in coal mines, the propagation speed and relative dielectric constant of electromagnetic waves in the front coal body are accurately calculated. Three boreholes not in the same plane are selected to carry out borehole radar advanced detection work respectively. A borehole trajectory instrument is used to detect the drilling trajectories of the three boreholes respectively. Based on the time-domain profile of the borehole radar detection results and the spatial coordinates of the borehole trajectories, the spatial position of the geological structure can be accurately identified. Combining the information on the lithology change characteristics during the drilling process, the key information such as the type, scale and accurate spatial position of the geological structure in front of the excavation working face can be comprehensively identified. Through the present invention, the advanced fine detection and three-dimensional transparent characterization of hidden small-scale structures in front of the excavation working face can be realized, meeting the outburst prevention requirements of the excavation working face and the construction trend of a transparent working face in an intelligent mine.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine detection, and in particular to a method, device, equipment, and storage medium for advanced fine detection of gas geological anomalies in an excavation working face. Background Art

[0002] Coal and gas outburst, as the main coal-rock gas dynamic disaster faced by outburst-prone coal mines, significantly restricts the mining intensity and excavation speed of coal mines, and mainly occurs in geological structure zones and places where the coal seam occurrence changes sharply. The advanced detection of underground geological structures in coal mines mainly adopts drilling and geophysical prospecting methods. The drilling technology has the characteristics of simple method and intuitive results, but it also has deficiencies such as large engineering quantity, long construction period, and small detection range. Geophysical prospecting technologies mainly include methods such as trough wave seismic, direct current method, transient electromagnetic, infrared temperature measurement, and ground penetrating radar. Due to different principles, their applicable ranges and usage scenarios are different. At present, the advanced detection of underground excavation working faces in coal mines mainly adopts mine roadway seismic advanced prediction technology, ground penetrating radar detection, and trough wave seismic detection technology, which have the advantages of non-destructive perception and high-efficiency detection, but also have deficiencies such as serious signal interference and low detection accuracy. In recent years, the drilling radar detection technology and equipment have been effectively developed, and some related applications have been carried out in the geotechnical engineering field, achieving good geological structure prediction and forecasting effects, but there is less research in the coal mine field, especially there are few reports and almost blanks in the aspect of outburst prevention and control in the excavation working face.

[0003] At the present stage, the advanced detection of gas geological anomalies in the excavation working faces of outburst-prone coal mines and high-gas coal mines mainly adopts two methods: drilling and geophysical prospecting. The drilling method judges whether there is a geological structure in front of the excavation working face according to the change of borehole lithology during the drilling process. The test results are accurate and intuitive, but the detection range of the borehole is small, there are detection blind areas between boreholes, and it is difficult to judge the range and occurrence and other characteristic information of the geological structure. Conventional geophysical prospecting means such as roadway seismic, ground penetrating radar, and trough wave seismic have poor detection result accuracy and low accuracy due to the interference of various mechanical equipment and vibration noises near the stope of the excavation working face; The advanced detection of drilling radar has advantages such as small interference, high accuracy, and large detection range. Single-hole detection can identify key information such as the type, burial depth, and radial distance from the borehole of the geological structure. However, since the drilling radar emits pulsed broadband electromagnetic wave signals 360° around the borehole, the orientation of the geological structure cannot be determined. Summary of the Invention

[0004] The present invention provides a method, device, equipment, and storage medium for advanced fine detection of gas geological anomalies in an excavation working face, aiming to achieve advanced fine detection and three-dimensional transparent characterization of hidden small-scale structures in front of the excavation working face, and meet the outburst prevention requirements of the excavation working face and the construction trend of a transparent working face in an intelligent coal mine.

[0005] To this end, the first object of the present invention is to propose a method for advanced fine detection of gas geological anomalies in the mining face, including:

[0006] At least three boreholes are drilled in the mining face, which are not in the same plane. The boreholes are set as follows: a central borehole with its direction along the axial direction of the roadway, and lateral boreholes facing both sides of the roadway and forming a preset angle with the axial direction of the roadway; based on the drilled boreholes, the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body are measured.

[0007] For the central borehole, a borehole radar is used for advanced detection, and the detection result is obtained and it is judged whether there is an abnormal reflection in the time domain profile of the detection result.

[0008] If there is an abnormal reflection, the advanced detection of the lateral boreholes on both sides of the central borehole is carried out in the same way to obtain the time domain profile of the detection result, and at the same time, the drilling trajectories of the three boreholes are obtained.

[0009] Based on the advanced detection time domain profiles and borehole trajectory coordinate data of the three boreholes, a three-dimensional drawing of the detection result is carried out to accurately pick out the spatial position of the geological structure.

[0010] Based on the multi-borehole detection results of the borehole radar and combined with the drilling data of the borehole construction, the detection advantages of drilling and in-borehole geophysical exploration are integrated, complementing and verifying each other, and accurately identifying the type, scale and spatial position of the geological structure in front of the mining face.

[0011] Among them, in the borehole design stage, considering the technical requirements of in-borehole geophysical exploration and spatial positioning of geological structures, at least 3 boreholes are set not in the same plane, and it is required that the drilling directions of the test boreholes in the mining face are respectively along the axial direction of the roadway and in front of both sides of the roadway, meeting the fine detection requirements for a range of 15 m in front of and on both sides of the roadway.

[0012] Among them, the following relationship is satisfied between the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body:

[0013]

[0014] In the formula: C is the propagation velocity of electromagnetic waves in the atmosphere, which is 3×10 8 m / s; ε is the relative dielectric constant of the coal body.

[0015] Among them, through the parallel calculation of multiple groups of boreholes, their average values are taken as the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body to improve the accuracy of the test results of the relative dielectric constant of the coal body.

[0016] Among them, in the step of using the borehole radar for advanced detection, it includes:

[0017] Adopt a 100 MHz borehole radar for advanced detection, effectively detecting formation signals within a range of 10 to 20 meters around the borehole. Set the spacing between adjacent detection points along the borehole axis to 10 to 20 cm to improve the spatial identification accuracy of detection data.

[0018] Process the original detection data obtained by the radar host of the borehole radar to obtain a single-hole fine detection result. Among them, the data processing methods at least include drift zeroing, bad trace elimination, background filtering, digital filtering, amplitude normalization, and automatic gain.

[0019] Among them, according to the detection result judgment, when there is no abnormal reflection in the time domain profile of the central borehole detection result and there is no abnormality in all borehole drillings, stop the detection and determine that there is no geological structure in front of the mining and excavation working face.

[0020] Among them, in the step of performing three-dimensional drawing of the detection result based on the advanced detection time domain profiles and borehole trajectory coordinate data of three boreholes and accurately picking out the spatial position of the geological structure, it includes:

[0021] Determine the borehole depth corresponding to the geological structure and the radial distance from the borehole according to the time domain profile of the reflected signal of the advanced detection.

[0022] Combine the borehole trajectory curve to determine the borehole trajectory coordinates corresponding to the borehole depth and the spatial circular curve where the geological structure is located.

[0023] Through the advanced detection time domain profiles and borehole trajectory coordinate data of three boreholes, with the aid of computer data processing means, realize the three-dimensional drawing of the detection result. The intersection point of the three circular curves is the spatial position of the geological structure.

[0024] The second object of the present invention is to propose an advanced fine detection device for gas geological abnormal bodies in a mining and excavation working face, including:

[0025] A borehole design module for drilling at least three boreholes on the mining and excavation working face that are not in the same plane. The boreholes are set as: a central borehole with a direction along the roadway axis, and lateral boreholes facing both sides of the roadway and forming a preset angle with the roadway axis; based on the drilled boreholes, measure the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body.

[0026] A first detection module for performing advanced detection on the central borehole using a borehole radar, obtaining the detection result and judging whether there is an abnormal reflection in the time domain profile of the detection result.

[0027] A second detection module for, when there is an abnormal reflection in the detection result of the first detection module, performing advanced detection on the lateral boreholes on both sides of the central borehole in the same manner, obtaining the time domain profile of the detection result, and simultaneously obtaining the drilling trajectories of the three boreholes.

[0028] A three-dimensional drawing module, which is used to perform three-dimensional drawing of detection results based on the advanced detection time-domain profiles of three boreholes and the borehole trajectory coordinate data, and accurately pick out the spatial positions of geological structures;

[0029] A drilling module, which is used to combine the multi-hole detection results of borehole radar with the drilling data of borehole construction, integrate the detection advantages of drilling and borehole geophysical prospecting, complement and verify each other, and accurately identify the types, scales and spatial positions of geological structures in front of the working face of mining and excavation.

[0030] The third object of the present invention is to provide an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steps in the method of the foregoing technical solution.

[0031] The fourth object of the present invention is to provide a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause a computer to execute the steps in the method according to the foregoing technical solution.

[0032] Different from the prior art, the advanced fine detection method for gas geological abnormal bodies in the working face of mining and excavation provided by the present invention, by means of the regional prediction or drainage boreholes constructed in the working face of outburst-prone mines and high-gas mines, adopts the in-situ measurement method of the relative dielectric constant of coal underground in coal mines, accurately calculates the propagation speed and relative dielectric constant of electromagnetic waves in the front coal body, selects three boreholes not in the same plane to carry out borehole radar advanced detection work respectively, uses a borehole trajectory instrument to detect the drilling trajectories of the three boreholes respectively, based on the time-domain profiles of the borehole radar detection results and the spatial coordinates of the borehole trajectories, can accurately identify the spatial positions of geological structures, and combines the information on the lithology change characteristics during the drilling process to comprehensively identify the key information such as the types, scales and accurate spatial positions of geological structures in front of the working face of mining and excavation. Through the present invention, it is possible to realize the advanced fine detection and three-dimensional transparent characterization of hidden small-scale structures in front of the working face of mining and excavation, meet the outburst prevention requirements of the working face of mining and excavation and the construction trend of a transparent working face in an intelligent mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The aspects and advantages of the present invention and / or additional aspects will become obvious and easy to understand from the following description of the embodiments in conjunction with the drawings, wherein:

[0034] Figure 1 is a schematic flow chart of an advanced fine detection method for gas geological abnormal bodies in the working face of mining and excavation provided by the present invention.

[0035] Figure 2It is a schematic diagram of borehole layout in the advanced fine detection method for gas-geological abnormal bodies in the excavation working face provided by the present invention.

[0036] Figure 3 It is a schematic diagram of advanced detection in the advanced fine detection method for gas-geological abnormal bodies in the excavation working face provided by the present invention.

[0037] Figure 4 It is a schematic diagram of the time-domain profile of the detection result in the advanced fine detection method for gas-geological abnormal bodies in the excavation working face provided by the present invention.

[0038] Figure 5 It is a schematic diagram of solving the spatial position of the geological structure in the advanced fine detection method for gas-geological abnormal bodies in the excavation working face provided by the present invention.

[0039] Figure 6 It is a schematic diagram of the structure of the advanced fine detection device for gas-geological abnormal bodies in the excavation working face provided by the present invention.

[0040] Figure 7 It is a schematic diagram of the structure of a non-temporary computer-readable storage medium provided by the present invention. Specific embodiments

[0041] The following details the embodiments of the present invention. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0042] Figure 1 An advanced fine detection method for gas-geological abnormal bodies in the excavation working face provided by the embodiments of the present invention includes:

[0043] S101: Drill at least three boreholes that are not in the same plane in the excavation working face. The boreholes are set as follows: a central borehole with a direction along the axial direction of the roadway, and lateral boreholes facing both sides of the roadway and forming a preset angle with the axial direction of the roadway; based on the drilled boreholes, calculate the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body.

[0044] In coal and gas outburst mines or high-gas mines, according to the outburst prevention requirements of the excavation working face, it is necessary to periodically construct regional prediction boreholes or coal seam gas pre-drainage boreholes. At the borehole design stage, the technical requirements of in-hole geophysical exploration and geological structure spatial positioning should be considered. At least 3 boreholes are not in the same plane. For the tunneling working face, the drilling directions are respectively along the axial direction of the roadway and in front of both sides of the roadway, meeting the fine detection requirements within a range of 15 m in front of and on both sides of the roadway. The specific borehole layout is shown in Figure 2 .

[0045] Select two drilled holes completed in the mining and excavation working face, insert a metal drill pipe into one of the drilled holes, conduct borehole radar detection in the other drilled hole, and calculate the propagation speed and relative dielectric constant of the electromagnetic wave based on the reflection characteristics of the time-domain profile of the detection result and the actual distance between the drilled holes. The two satisfy Equation (1). The accuracy of the test result of the relative dielectric constant of the coal body can be improved by taking the average value through the tests of multiple groups of drilled holes.

[0046] The following relationship exists between the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body:

[0047]

[0048] In the formula: C is the propagation speed of the electromagnetic wave in the atmosphere, which is 3×10 8 m / s; ε is the relative dielectric constant of the coal body.

[0049] S102: For the central drilled hole, use a borehole radar for advanced detection, obtain the detection result, and determine whether there is an abnormal reflection in the time-domain profile of the detection result.

[0050] Carry out the borehole radar advanced detection work on the intermediate drilled hole (the 1# drilled hole constructed along the axial direction of the roadway in the tunneling working face). Use a 100 MHz radar antenna for detection, which can effectively detect the formation signals within a range of 10 - 20 meters around the drilled hole. Set the adjacent detection point spacing along the axial direction of the drilled hole to 10 - 20 cm to improve the spatial identification accuracy of the detection data. After post-processing operations such as drift zeroing, bad track removal, background filtering, digital filtering, amplitude normalization, and automatic gain on the original detection data, a single-hole fine detection result is obtained.

[0051] S103: If there is an abnormal reflection, carry out the advanced detection of the lateral drilled holes on both sides of the central drilled hole in the same way to obtain the time-domain profile of the detection result, and at the same time obtain the drilling trajectories of the three drilled holes.

[0052] According to the judgment of the detection result, when there is no abnormal reflection in the time-domain profile of the detection result of the central drilled hole and there is no abnormality in the drilling of all drilled holes, the detection is stopped, and it is determined that there is no geological structure in front of the mining and excavation working face. Otherwise, continue to carry out the borehole radar advanced detection work on the other two lateral drilled holes (the 2# drilled hole and the 3# drilled hole constructed along the front of both sides of the roadway in the tunneling working face). The advanced detection process is as Figure 3 shown, and the schematic diagram of the time-domain profile of the detection result can be seen in Figure 4 .

[0053] S104: Based on the advanced detection time-domain profiles and the drilling trajectory coordinate data of the three drilled holes, conduct three-dimensional drawing of the detection results to accurately pick out the spatial position of the geological structure.

[0054] Based on the time-domain profile of the reflected signals from the advanced detection, the borehole depth corresponding to the geological structure and the radial distance from the borehole can be determined. Combining with the borehole trajectory curve, the borehole trajectory coordinates corresponding to this borehole depth and the spatial circular curve where the geological structure is located can be determined. Through the time-domain profiles of the advanced detection and the borehole trajectory coordinate data of three boreholes, with the help of data processing means such as a computer, the three-dimensional drawing of the detection results can be realized. The intersection point of the three circular curves is the spatial position of the geological structure. For the specific solution schematic diagram, see Figure 5 。

[0055] S105: Based on the multi-borehole detection results of the borehole radar and combined with the drilling data of the borehole construction, comprehensively utilize the detection advantages of drilling and borehole geophysical exploration, complement and verify each other, and accurately identify the key information such as the type, scale and spatial position of the geological structure in front of the mining face.

[0056] In addition, as Figure 6 shown, the present invention provides an advanced fine detection device for gas geological anomalies in the mining face, including:

[0057] A borehole design module 310, configured to drill at least three boreholes on the mining face that are not in the same plane. The boreholes are set as: a central borehole with a direction along the axial direction of the roadway, and lateral boreholes facing both sides of the roadway and forming a preset angle with the axial direction of the roadway; based on the drilled boreholes, calculate the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body;

[0058] A first detection module 320, configured to perform advanced detection on the central borehole using a borehole radar, obtain the detection results and determine whether there are abnormal reflections in the time-domain profile of the detection results;

[0059] A second detection module 330, configured to, when there are abnormal reflections in the detection results of the first detection module, perform advanced detection on the lateral boreholes on both sides of the central borehole in the same manner, obtain the time-domain profile of the detection results, and simultaneously obtain the drilling trajectories of the three boreholes;

[0060] A three-dimensional drawing module 340, configured to perform three-dimensional drawing of the detection results based on the time-domain profiles of the advanced detection of the three boreholes and the borehole trajectory coordinate data, and accurately pick out the spatial position of the geological structure;

[0061] A drilling module 350, configured to, based on the multi-borehole detection results of the borehole radar and combined with the drilling data of the borehole construction, comprehensively utilize the detection advantages of drilling and borehole geophysical exploration, complement and verify each other, and accurately identify the type, scale and spatial position of the geological structure in front of the mining face.

[0062] To implement the embodiments, the present invention also provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the steps in the method for advanced fine detection of geological anomalies in the foregoing technical solution.

[0063] As Figure 7 shown, a non-transitory computer-readable storage medium includes a memory 810 storing instructions, an interface 830, and the instructions can be executed by a processor 820 to complete the method. Optionally, the storage medium may be a non-transitory computer-readable storage medium. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, magnetic tape, a floppy disk, and an optical data storage device, etc.

[0064] The present invention provides a method for advanced fine detection of gas geological anomalies in an excavation working face. By means of regional prediction boreholes or pre-drainage boreholes, advanced drilling of geological structures is realized. The single-hole detection of borehole radar is used to realize the transformation of the positioning of geological structures from points to surfaces. The multi-hole detection of boreholes in non-coplanar planes is used to realize the three-dimensional positioning of geological structures from surfaces to volumes. In addition, the accurate measurement of borehole trajectories helps to improve the accuracy of the spatial positioning of geological structures. This method provides a reliable technical support for the construction of transparent geology in the intelligent mine excavation working face.

[0065] To implement the above embodiments, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it realizes the advanced fine detection of geological anomalies as in the embodiments of the present invention.

[0066] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0068] Any process or method description represented in a flowchart or described otherwise herein can be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logical function or process. The scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed in a substantially simultaneous manner or in a reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0069] The logic and / or steps represented in a flowchart or described otherwise herein, for example, can be considered a sequenced list of executable instructions for implementing a logical function and can be embodied specifically in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device. As used in this specification, "a computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection having one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, as the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or other appropriate processing as necessary, and then stored in a computer memory.

[0070] It should be understood that each part of the present invention can be implemented by hardware, software, firmware, or a combination thereof. In the described embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one or a combination of the following techniques well known in the art can be used: discrete logic circuits with logic gate circuits for implementing logic functions on data signals, application specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0071] Those of ordinary skill in the art can understand that all or part of the steps carried by the method of the described embodiments can be completed by instructing relevant hardware through a program. The described program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0072] In addition, each functional unit in various embodiments of the present invention can be integrated into a processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0073] The mentioned storage medium can be a read-only memory, a magnetic disk, an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the embodiments within the scope of the present invention.

Claims

1. An advanced fine detection method for gas geological anomalies in an excavation working face, characterized in that, it includes: At least three boreholes are drilled in the excavation working face, and the boreholes are not in the same plane. The boreholes are set as follows: a central borehole with a direction along the axial direction of the roadway and lateral boreholes facing both sides of the roadway and forming a preset angle with the axial direction of the roadway; based on the drilled boreholes, the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body are measured; An advanced detection is carried out on the central borehole, and the detection result is obtained and it is judged whether there is an abnormal reflection in the time domain profile of the detection result; If there is an abnormal reflection, then the advanced detection of the lateral boreholes on both sides of the central borehole is carried out in the same way to obtain the time domain profile of the detection result, and at the same time, the drilling trajectories of the three boreholes are obtained; Based on the time domain profiles of the advanced detections of the three boreholes and the borehole trajectory coordinate data, a three-dimensional drawing of the detection result is carried out to accurately pick out the spatial position of the geological structure; Based on the multi-borehole detection results of the borehole radar and combined with the drilling data of the borehole construction, the respective detection advantages of drilling and in-borehole geophysical prospecting are integrated, complementing each other and verifying each other, and accurately identifying the type, scale and spatial position of the geological structure in front of the excavation working face; The calculating the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body based on the drilled boreholes includes: According to the reflection characteristics of the time domain profile of the detection result and combined with the actual distance between the boreholes, the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body are calculated.

2. The advanced fine detection method for gas geological anomalies in an excavation working face according to claim 1, characterized in that, In the borehole design stage, considering the technical requirements of in-borehole geophysical prospecting and the spatial positioning of geological structures, at least 3 boreholes are set not in the same plane, and it is required that the drilling directions of the test boreholes in the excavation working face are along the axial direction of the roadway and in front of both sides of the roadway respectively, meeting the fine detection requirements within a range of 15 m in front of and on both sides of the roadway.

3. The advanced fine detection method for gas geological anomalies in an excavation working face according to claim 1, characterized in that, The following relationship is satisfied between the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body: Where: C is the propagation speed of electromagnetic waves in the atmosphere, which is 3×10 8 m / s; ε is the relative dielectric constant of the coal body.

4. The advanced fine detection method for gas geological anomalies in an excavation working face according to claim 3, characterized in that, Through parallel calculations of multiple groups of boreholes, the average value is taken as the in-situ electromagnetic wave propagation velocity and the relative dielectric constant of the coal body to improve the accuracy of the test results of the relative dielectric constant of the coal body.

5. The advanced fine detection method for gas geological anomalies in an excavation working face according to claim 1, characterized in that, In the step of carrying out the advanced detection on the central borehole, it includes: Using a 100 MHz borehole radar to carry out advanced detection, effectively detecting the formation signals within a range of 10 - 20 meters around the borehole, and setting the adjacent detection point spacing along the axial direction of the borehole to 10 - 20 cm to improve the spatial identification accuracy of the detection data; The original detection data obtained by the radar host of the borehole radar is processed to obtain the fine detection result of a single borehole; among them, the data processing methods at least include drift zeroing, bad track removal, background filtering, digital filtering, amplitude normalization and automatic gain.

6. The advanced fine detection method for gas geological anomaly bodies in the mining face according to claim 1, characterized in that, judging according to the detection results, when there is no abnormal reflection in the time domain profile of the central borehole detection results and there is no abnormality in all borehole drillings, the detection is stopped and it is determined that there is no geological structure in front of the mining face.

7. The advanced fine detection method for gas geological anomaly bodies in the mining face according to claim 1, characterized in that, in the step of performing three-dimensional drawing of the detection results based on the time domain profiles of the advanced detection of three boreholes and the borehole trajectory coordinate data, and accurately picking out the spatial position of the geological structure, it includes: determining the borehole depth corresponding to the geological structure and the radial distance from the borehole according to the time domain profile of the reflected signal of the advanced detection; combining the borehole trajectory curve to determine the borehole trajectory coordinates corresponding to the borehole depth and the spatial circular curve where the geological structure is located; through the time domain profiles of the advanced detection of three boreholes and the borehole trajectory coordinate data, with the aid of computer data processing means, realizing the three-dimensional drawing of the detection results, and the intersection point of the three circular curves is the spatial position of the geological structure.

8. An advanced fine detection device for gas geological anomaly bodies in the mining face, characterized in that, it includes: a borehole design module for drilling at least three boreholes not in the same plane in the mining face, and the boreholes are arranged as: a central borehole with a direction along the axial direction of the roadway and lateral boreholes facing both sides of the roadway and forming a preset angle with the axial direction of the roadway; based on the drilled boreholes, calculating the propagation speed of in-situ electromagnetic waves and the relative dielectric constant of the coal body; a first detection module for performing advanced detection on the central borehole using a borehole radar, obtaining the detection results and judging whether there is abnormal reflection in the time domain profile of the detection results; a second detection module for, when there is abnormal reflection in the detection results of the first detection module, performing advanced detection on the lateral boreholes on both sides of the central borehole in the same manner, obtaining the time domain profile of the detection results, and at the same time obtaining the drilling trajectories of the three boreholes; a three-dimensional drawing module for performing three-dimensional drawing of the detection results based on the time domain profiles of the advanced detection of three boreholes and the borehole trajectory coordinate data, and accurately picking out the spatial position of the geological structure; a drilling module for, based on the multi-borehole detection results of the borehole radar and in combination with the drilling data of borehole construction, integrating the detection advantages of drilling and downhole geophysical prospecting, complementing each other and verifying each other, and accurately identifying the type, scale and spatial position of the geological structure in front of the mining face; the borehole design module is further used for calculating the propagation speed of in-situ electromagnetic waves and the relative dielectric constant of the coal body according to the reflection characteristics of the time domain profile of the detection results and in combination with the actual distance between the boreholes.

9. An electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the steps in the method according to any one of claims 1-7.

10. A non-transitory computer-readable storage medium storing computer instructions, wherein, The computer instructions are used to cause the computer to execute each step in the method according to any one of claims 1-7.

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