CN114934810A - Advanced fine detection method and equipment for gas geological abnormal body on excavation working face - Google Patents
Advanced fine detection method and equipment for gas geological abnormal body on excavation working face Download PDFInfo
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Abstract
The invention provides a method and equipment for advanced and fine detection of a gas geological abnormal body on a mining working face, which adopt an in-situ measurement method of relative dielectric constant of underground coal of a coal mine to accurately measure the propagation speed and the relative dielectric constant of electromagnetic wave of a coal body in front, select three drill holes which are not on the same plane to respectively carry out advanced detection work of a drilling radar, respectively detect the drilling tracks of the three drill holes by adopting a drilling track instrument, accurately identify the spatial position of a geological structure based on a time domain section and the spatial coordinates of the drilling tracks of a drilling radar detection result, and comprehensively identify key information such as the type, the scale, the accurate spatial position and the like of the geological structure in front of the mining working face by combining lithological change characteristic information in the drilling process. By the method, advanced fine detection and three-dimensional transparent representation of the hidden small-scale structure in front of the mining working face can be realized, and the outburst prevention requirement of the mining working face and the construction trend of the intelligent mine transparent working face are met.
Description
Technical Field
The invention relates to the technical field of coal mine detection, in particular to a method, a device, equipment and a storage medium for advanced fine detection of a gas geological abnormal body on a mining working face.
Background
Coal and gas outburst is taken as main coal rock gas dynamic disasters facing outburst mines, obviously restricts the mining intensity and the excavating speed of the mines, and mainly occurs at places with rapid changes of geological structure zones and coal beds. The advanced detection of underground geological structures of coal mines mainly adopts drilling and geophysical prospecting means, and the drilling technology has the characteristics of simple method and visual result, but also has the defects of large engineering quantity, long construction period, small detection range and the like; the geophysical prospecting technology mainly comprises methods such as a channel wave earthquake method, a direct current method, transient electromagnetism, infrared temperature measurement and a geological radar, and the application range and the use scene of the geophysical prospecting technology are different according to different principles. The prior advanced detection of the underground coal mine excavation working face mainly adopts a mine roadway earthquake advanced prediction technology, geological radar detection and a channel wave earthquake detection technology, has the advantages of nondestructive perception and high-efficiency detection, and has the defects of serious signal interference, low detection precision and the like. In recent years, drilling radar detection technology and equipment are effectively developed, some related applications are developed in the field of geotechnical engineering, good geological structure prediction effect is obtained, research in the field of coal mines is less, and reports are almost blank particularly in the aspect of prominent prevention and control of a mining working face.
The advanced detection of the gas geological abnormal body of the excavation working face of the outburst mine and the high gas mine at the present stage mainly adopts two methods of drilling and geophysical prospecting. The drilling method judges whether a geological structure exists in front of a mining working face according to the change of lithology of drill holes in the drilling process, the test result is accurate and visual, but the detection range of the drill holes is small, detection blind areas exist among the drill holes, and the characteristic information such as the range, the occurrence and the like of the geological structure is difficult to judge; the conventional geophysical prospecting means such as roadway earthquake, geological radar, channel wave earthquake and the like have poor detection result precision and low accuracy due to the interference of various mechanical equipment and vibration noise near a mining face; the drilling radar advanced detection has the advantages of small interference, high precision, large detection range and the like, the single-hole detection can identify key information such as the type, the buried depth, the radial distance from a drill hole and the like of a geological structure, but the drilling radar transmits pulse broadband electromagnetic wave signals to the periphery of the drill hole for 360 degrees, and the direction of the geological structure cannot be determined.
Disclosure of Invention
The invention provides a method, a device, equipment and a storage medium for advanced fine detection of a gas geological abnormal body on a mining working face, and aims to realize advanced fine detection and three-dimensional transparent representation of a hidden small-scale structure in front of the mining working face, and meet outburst prevention requirements of the mining working face and construction trends of an intelligent mine transparent working face.
Therefore, the first purpose of the invention is to provide a method for advanced and fine detection of gas geological abnormal bodies on a mining working face, which comprises the following steps:
drilling at least three drill holes which are not on the same plane on a mining working face, wherein the drill holes are arranged as follows: the drilling method comprises the following steps of (1) drilling a center hole in the axial direction of the roadway and side holes which face to the two sides of the roadway and form a preset angle with the axial direction of the roadway; measuring and calculating the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body based on the drilled drill hole;
aiming at the central drilling hole, using a drilling radar to perform advanced detection, acquiring a detection result and judging whether the time domain section of the detection result has abnormal reflection or not;
if abnormal reflection exists, carrying out advanced detection on the lateral drill holes on the two sides of the central drill hole in the same mode to obtain a time domain section of a detection result, and simultaneously obtaining drilling tracks of the three drill holes;
three-dimensional drawing of a detection result is carried out based on advanced detection time domain profiles and drilling track coordinate data of three drill holes, and the spatial position of a geological structure is accurately picked out;
based on the multi-hole detection result of the drilling radar, the drilling data of drilling construction is combined, the respective detection advantages of drilling and in-hole geophysical prospecting are integrated, mutual supplement and mutual verification are achieved, and the type, the scale and the spatial position of the geological structure in front of the mining working face are accurately identified.
In the drilling design stage, the technical requirements of geophysical prospecting and geological structure space positioning in the hole are considered, at least 3 drill holes are arranged and are not on the same plane, the drilling direction of the test drill hole of the excavation working face is required to be respectively along the axial direction of the roadway and the front of the two sides of the roadway, and the fine detection requirements of the front of the roadway and the ranges of 15m on the two sides of the roadway are met.
Wherein, the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body satisfy the following relations:
in the formula: c is the propagation velocity of electromagnetic wave in the atmosphere, and is 3X 10 8 m/s; epsilon is the relative dielectric constant of the coal body.
The average value of the parallel calculation of a plurality of groups of drill holes is taken as the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body, so that the accuracy of the relative dielectric constant test result of the coal body is improved.
Wherein, in the step of using the borehole radar for advanced detection, the method comprises the following steps:
the method comprises the following steps of adopting a 100MHz drilling radar to perform advanced detection, effectively detecting formation signals within a range of 10-20 meters around a drilling hole, setting the distance between adjacent detection points along the axial direction of the drilling hole to be 10-20 cm, and improving the space identification precision of detection data;
performing data processing on original detection data acquired by a radar host of the drilling radar to obtain a single-hole fine detection result; the data processing mode at least comprises drifting return to zero, bad track elimination, background filtering, digital filtering, amplitude normalization and automatic gain.
And judging according to the detection result that the time domain section in the central drilling detection result has no abnormal reflection and when drilling of all the drill holes has no abnormality, stopping detection and judging that no geological structure exists in front of the mining working face.
The method comprises the following steps of performing three-dimensional drawing of a detection result based on advanced detection time domain profile and drilling track coordinate data of three drill holes, and accurately picking out the spatial position of a geological structure, wherein the steps comprise:
according to the reflected signal time domain profile of advanced detection, determining the depth of a drill hole corresponding to the geological structure and the radial distance from the drill hole;
determining a drilling track coordinate corresponding to the drilling depth and a spatial circular curve of the geological structure by combining the drilling track curve;
the three-dimensional drawing of the detection result is realized by advanced detection of time domain profile and drilling track coordinate data of three drilling holes and by means of computer data processing, and the intersection point of the three circular curves is the spatial position of the geological structure.
The second objective of the present invention is to provide a device for advanced fine detection of gas geological anomalous body on a mining working face, comprising:
the drilling design module is used for drilling at least three drilling holes which are not on the same plane on the mining working face, and the drilling holes are arranged as follows: the drilling method comprises the following steps of (1) drilling a center hole in the axial direction of the roadway and side holes which face to the two sides of the roadway and form a preset angle with the axial direction of the roadway; measuring and calculating the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body based on the drilled drill hole;
the first detection module is used for carrying out advanced detection on the central drilling hole by using a drilling radar, acquiring a detection result and judging whether the time domain section of the detection result has abnormal reflection or not;
the second detection module is used for carrying out advanced detection on the lateral drill holes on the two sides of the central drill hole in the same mode when abnormal reflection exists in the detection result of the first detection module, obtaining a time domain section of the detection result and simultaneously obtaining drilling tracks of the three drill holes;
the three-dimensional drawing module is used for three-dimensionally drawing a detection result based on the advanced detection time domain profile and the coordinate data of the drilling track of the three drilling holes, and accurately picking out the spatial position of the geological structure;
and the drilling module is used for integrating respective detection advantages of drilling and in-hole geophysical prospecting based on a drilling radar multi-hole detection result and combined with drilling data of drilling construction, supplementing and mutually verifying each other, and accurately identifying the type, scale and spatial position of a geological structure in front of the mining working face.
A third object of the present invention is to provide an electronic apparatus, comprising: at least one processor; and a memory communicatively coupled 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 perform the steps of the method of the foregoing technical solution.
A fourth object of the present invention is to propose a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the steps of the method according to the aforementioned technical solution.
Different from the prior art, the advanced fine detection method for the gas geological abnormal body on the excavation working face provided by the invention, by means of regional prediction or extraction drill holes of construction of the excavation working face of a outburst mine and a high gas mine, a relative dielectric constant in-situ measurement method of coal mine underground coal is adopted, the propagation speed and the relative dielectric constant of electromagnetic waves of a coal body in front are accurately measured, three drill holes which are not on the same plane are selected to respectively carry out advanced detection work of a drilling radar, drilling tracks of the three drill holes are respectively detected by a drilling track instrument, the spatial position of a geological structure can be accurately identified based on a time domain section and a drilling track spatial coordinate of a drilling radar detection result, and key information such as the type, the scale, the accurate spatial position and the like of the geological structure in front of the excavation working face is comprehensively identified by combining lithological change characteristic information in a drilling process. By the method, advanced fine detection and three-dimensional transparent representation of the hidden small-scale structure in front of the mining working face can be realized, and the outburst prevention requirement of the mining working face and the construction trend of the intelligent mine transparent working face are met.
Drawings
The invention and/or additional aspects and advantages will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flow chart of a method for advanced fine detection of a gas geological abnormal body on a mining working face provided by the invention.
Fig. 2 is a schematic diagram of the arrangement of the drill holes in the advanced fine detection method for the gas geological abnormal body on the mining working face provided by the invention.
Fig. 3 is a schematic diagram of advanced detection in the advanced fine detection method for the gas geological abnormal body on the mining working face provided by the invention.
FIG. 4 is a schematic time-domain cross-sectional view of a detection result in the advanced fine detection method for the gas geological anomalous body of the mining working face provided by the invention.
FIG. 5 is a schematic diagram of solving the spatial position of a geological structure in the advanced fine detection method for the gas geological anomalous body of the excavation working face.
Fig. 6 is a schematic structural diagram of a device for advanced fine detection of a gas geological abnormal body on a mining working face provided by the invention.
Fig. 7 is a schematic structural diagram of a non-transitory computer-readable storage medium according to the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a diagram illustrating a method for advanced fine detection of a gas geological anomalous body on a mining face according to an embodiment of the present invention. The method comprises the following steps:
s101: drilling at least three drill holes which are not on the same plane on a mining working face, wherein the drill holes are arranged as follows: the drilling method comprises the following steps of (1) drilling a center hole in the axial direction of the roadway and side holes which face to the two sides of the roadway and form a preset angle with the axial direction of the roadway; and (4) calculating the in-situ electromagnetic wave propagation speed and the coal body relative dielectric constant based on the drilled drill hole.
In a coal and gas outburst mine or a high gas mine, drilling holes or coal bed gas pre-extraction drilling holes need to be predicted periodically in a construction area according to the outburst prevention requirement of an excavation working face, at least 3 drilling holes are not in the same plane in the drilling hole design stage according to the technical requirements of in-hole geophysical prospecting and geological structure space positioning, the drilling hole arrangement is specifically shown in figure 2, the drilling direction of the excavation working face is required to be respectively along the axial direction of a roadway and the front of two sides of the roadway, and the fine detection requirements of 15m ranges in the front of the roadway and two sides of the roadway are met.
Two drill holes which are constructed on the excavation working face are selected, the metal drill rod is inserted into one of the drill holes, radar detection is carried out in the other drill hole, the propagation speed and the relative dielectric constant of electromagnetic waves are measured and calculated according to the time domain section reflection characteristics of the detection result and the actual distance between the drill holes, and the two drill holes meet the formula (1). The average value of the coal body relative dielectric constant can be obtained through the test of a plurality of groups of drill holes, and the accuracy of the coal body relative dielectric constant test result is improved.
The in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body satisfy the following relation:
in the formula: c is the propagation velocity of electromagnetic wave in the atmosphere, and is 3X 10 8 m/s; epsilon is the relative dielectric constant of the coal body.
S102: and aiming at the central drilling hole, performing advanced detection by using a drilling radar, acquiring a detection result and judging whether the time domain section of the detection result has abnormal reflection.
The method comprises the steps of carrying out drilling radar advanced detection work of middle drilling (1 # drilling constructed by a driving face along the axial direction of a roadway), detecting by adopting a radar antenna of 100MHz, effectively detecting formation signals within the range of 10-20 meters around the drilling, setting the distance between adjacent detection points along the axial direction of the drilling to be 10-20 cm, improving the space identification precision of detection data, and carrying out post-processing operations such as drifting zeroing, bad track elimination, background filtering, digital filtering, amplitude normalization, automatic gain and the like on original detection data to obtain a single-hole fine detection result.
S103: if abnormal reflection exists, the advanced detection of the lateral drilling holes on the two sides of the central drilling hole is carried out in the same mode, a time domain section of a detection result is obtained, and the drilling tracks of the three drilling holes are obtained simultaneously.
And judging according to the detection result that the time domain section in the detection result of the central drilling hole has no abnormal reflection and when drilling of all the drilling holes has no abnormality, stopping detection and judging that no geological structure exists in front of the mining working face. On the contrary, the drilling radar advanced detection work of the other 2 lateral drilling holes (the 2# drilling hole and the 3# drilling hole which are constructed on the driving working face along the front of the two sides of the roadway) is continuously carried out, the advanced detection process is shown in fig. 3, and the time domain section schematic diagram of the detection result is shown in fig. 4.
S104: and (3) three-dimensional drawing of a detection result is carried out based on the advanced detection time domain profile and the coordinate data of the drilling track of the three drilling holes, and the spatial position of the geological structure is accurately picked out.
According to the reflected signal time domain section of advanced detection, the drilling depth corresponding to the geological structure and the radial distance from the drilling hole can be determined, the drilling track coordinate corresponding to the drilling depth and the spatial circular curve where the geological structure is located are determined by combining the drilling track curve, three-dimensional drawing of detection results is achieved through advanced detection time domain sections and the drilling track coordinate data of three drilling holes and data processing means such as a computer, the intersection point of the three circular curves is the spatial position of the geological structure, and a specific solving schematic diagram is shown in fig. 5.
S105: based on the multi-hole detection result of the drilling radar, the drilling data of drilling construction is combined, the respective detection advantages of drilling and in-hole geophysical prospecting are integrated, mutual supplement and mutual verification are achieved, and key information such as the type, scale, spatial position and the like of the geological structure in front of the mining working face is accurately identified.
In addition, as shown in fig. 6, the present invention provides a device for advanced fine detection of a gas geological anomalous body on a mining face, comprising:
a bore design module 310 for drilling at least three bores at the mining face that are not in the same plane, the bores configured to: the drilling method comprises the following steps of (1) drilling a center hole in the axial direction of the roadway and side holes which face to the two sides of the roadway and form a preset angle with the axial direction of the roadway; measuring and calculating the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body based on the drilled drill hole;
the first detection module 320 is configured to perform advanced detection on the central borehole by using a borehole radar, obtain a detection result, and determine whether an abnormal reflection exists in a time domain profile of the detection result;
the second detection module 330 is configured to perform advanced detection on the lateral boreholes on both sides of the central borehole in the same manner when the abnormal reflection exists in the detection result of the first detection module, obtain a time-domain profile of the detection result, and obtain drilling trajectories of the three boreholes at the same time;
the three-dimensional drawing module 340 is used for performing three-dimensional drawing on a detection result based on advanced detection time domain profiles and drilling track coordinate data of three drilling holes, and accurately picking out a spatial position of a geological structure;
and the drilling module 350 is used for integrating respective detection advantages of drilling and in-hole geophysical prospecting based on a drilling radar multi-hole detection result and combined with drilling data of drilling construction, supplementing and mutually verifying each other, and accurately identifying the type, scale and spatial position of a geological structure in front of the mining working face.
In order to implement the embodiments, the present invention further provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; 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 of the geological anomaly advanced fine detection method of the technical scheme.
As shown in fig. 7, the non-transitory computer readable storage medium includes a memory 810 of instructions executable by a processor 820 to perform a method, and an interface 830. Alternatively, 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, a magnetic tape, a floppy disk, an optical data storage device, and the like.
The invention provides a method for advanced fine detection of a gas geological abnormal body on a mining working face, which realizes advanced drilling of a geological structure by means of regional prediction drilling or pre-extraction drilling, realizes positioning conversion of the geological structure from point to surface by adopting single-hole detection of a drilling radar, and realizes three-dimensional positioning of the geological structure from surface to body by multi-hole detection of drilling holes on a non-same plane. In addition, the accurate measurement of the drilling track assists in improving the precision of the spatial positioning of the geological structure. The method provides reliable technical support for transparent geological construction of an intelligent mine excavation working face.
To achieve the embodiments, the present invention also proposes a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, enables advanced fine detection of geological anomalies according to embodiments of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the terms does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied 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, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means 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 would include the following: an electrical connection (electronic device) having one or more wires, 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 could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the described embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
One of ordinary skill in the art will appreciate that all or part of the steps carried by the method implementing the embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may also be stored in a computer-readable storage medium.
The mentioned storage medium may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the embodiments described herein without departing from the scope of the invention.
Claims (10)
1. A method for advanced fine detection of gas geological abnormal bodies on a mining working face is characterized by comprising the following steps:
at least three drill holes which are not on the same plane are drilled on the mining working face, and the drill holes are arranged as follows: the direction of the central drilling hole is along the axial direction of the roadway, and the lateral drilling holes face to the two sides of the roadway and form a preset angle with the axial direction of the roadway; measuring and calculating the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body based on the drilled drill hole;
carrying out advanced detection on the central drilling hole, acquiring a detection result and judging whether the time domain section of the detection result has abnormal reflection or not;
if abnormal reflection exists, carrying out advanced detection on the lateral drill holes on the two sides of the central drill hole in the same mode to obtain a time domain section of a detection result, and simultaneously obtaining drilling tracks of the three drill holes;
three-dimensional drawing of a detection result is carried out based on advanced detection time domain profiles and drilling track coordinate data of three drilling holes, and the spatial position of a geological structure is accurately picked out;
based on the multi-hole detection result of the drilling radar, the drilling data of drilling construction is combined, the respective detection advantages of drilling and in-hole geophysical prospecting are integrated, mutual supplement and mutual verification are carried out, and the type, scale and spatial position of the geological structure in front of the mining working face are accurately identified.
2. The advanced fine detection method for the gas geological abnormal body of the excavation working face according to claim 1, characterized in that in a drilling design stage, technical requirements of in-hole geophysical prospecting and geological structure space positioning are considered, at least 3 drill holes are arranged and are not on the same plane, and the drilling directions of the test drill holes of the excavation working face are respectively along the axial direction of the roadway and the front of two sides of the roadway, so that the fine detection requirements of 15m ranges in the front of the roadway and the two sides of the roadway are met.
3. The advanced fine detection method for the gas geological abnormal body of the mining working face according to claim 1, wherein the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body satisfy the following relation:
in the formula: c is the propagation velocity of electromagnetic wave in the atmosphere, and is 3X 10 8 m/s; and epsilon is the relative dielectric constant of the coal body.
4. The advanced fine detection method for the gas geological abnormal body of the mining working face according to claim 3, characterized in that the accuracy of the relative dielectric constant test result of the coal body is improved by taking the average value of a plurality of groups of drill holes as the in-situ electromagnetic wave propagation speed and the relative dielectric constant of the coal body through parallel calculation.
5. The method for advanced fine detection of gas geological anomalies on a mining face as claimed in claim 1, wherein the step of advanced detection of the center bore hole comprises:
the method comprises the following steps of adopting a 100MHz drilling radar to perform advanced detection, effectively detecting formation signals within a range of 10-20 meters around a drilling hole, setting the distance between adjacent detection points along the axial direction of the drilling hole to be 10-20 cm, and improving the space identification precision of detection data;
performing data processing on original detection data acquired by a radar host of the drilling radar to obtain a single-hole fine detection result; the data processing mode at least comprises drift zeroing, bad channel elimination, background filtering, digital filtering, amplitude normalization and automatic gain.
6. The advanced fine detection method for the gas geological abnormal body of the mining working face according to claim 1, characterized in that when the time domain section in the detection result of the central drilling is judged to have no abnormal reflection and all the drilling holes have no abnormality according to the detection result, the detection is stopped, and the geological structure in front of the mining working face is judged to be absent.
7. The advanced fine detection method for the gas geological abnormal body of the mining working face according to claim 1, wherein the step of accurately picking out the spatial position of the geological structure by three-dimensional drawing of the detection result based on the advanced detection time domain section and the coordinate data of the track of the three drill holes comprises the following steps:
according to the reflected signal time domain profile of advanced detection, determining the depth of a drill hole corresponding to the geological structure and the radial distance from the drill hole;
determining a drilling track coordinate corresponding to the drilling depth and a spatial circular curve of the geological structure by combining the drilling track curve;
the time domain section and the coordinate data of the drilling track are detected in advance through the three drilling holes, the three-dimensional drawing of the detection result is realized by means of computer data processing, and the intersection point of the three circular curves is the spatial position of the geological structure.
8. The utility model provides a mining working face gas geology anomalous body advanced fine detection device which characterized in that includes:
the drilling design module is used for drilling at least three drilling holes which are not on the same plane on the mining working face, and the drilling holes are arranged as follows: the direction of the central drilling hole is along the axial direction of the roadway, and the lateral drilling holes face to the two sides of the roadway and form a preset angle with the axial direction of the roadway; measuring and calculating the propagation speed of in-situ electromagnetic waves and the relative dielectric constant of the coal body based on the drilled drill hole;
the first detection module is used for carrying out advanced detection on the central drilling hole by using a drilling radar, acquiring a detection result and judging whether the time domain section of the detection result has abnormal reflection or not;
the second detection module is used for carrying out advanced detection on the lateral drill holes on the two sides of the central drill hole in the same mode when abnormal reflection exists in the detection result of the first detection module, obtaining a time domain section of the detection result and simultaneously obtaining drilling tracks of the three drill holes;
the three-dimensional drawing module is used for three-dimensionally drawing a detection result based on the advanced detection time domain profile and the coordinate data of the drilling track of the three drilling holes, and accurately picking out the spatial position of the geological structure;
and the drilling module is used for combining the drilling data of drilling construction based on the multi-hole detection result of the drilling radar, integrating the respective detection advantages of drilling and in-hole geophysical prospecting, supplementing and mutually verifying each other, and accurately identifying the type, scale and spatial position of the geological structure in front of the mining working face.
9. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the method of any one of claims 1-7.
10. A non-transitory computer readable storage medium having stored thereon computer instructions for causing the computer to perform the steps of the method according to any one of claims 1-7.
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