A multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement in space

Abstract

The present invention discloses a multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement. By respectively conducting advanced boreholes and long-distance boreholes at the working faces of two parallel tunneling roadways for forward geological exploration, and in order to improve the accuracy of exploration and increase the detection range, an excitation array is sent into the advanced boreholes of each roadway, and a measurement array is sent into each long-distance borehole. The excitation array in one roadway emits current outward, and the measurement array in the other roadway conducts measurement. The measurement device and the excitation device can move in the boreholes to obtain a large number of sets of forward geological data for long-distance and large-scale advanced detection.

Description

Technical Field

[0001] The present invention belongs to the field of coal mine intelligentization, and particularly relates to a multi-borehole coal mine tunneling advanced detection method with separated excitation and measurement spaces. Background Technique

[0002] Speeding up the construction of mining intelligentization has become the only way to achieve high-quality development in the industry. Geological guarantee technology is the foundation of coal intelligent safety guarantee and the prerequisite guarantee for the implementation of all key intelligent tunneling technologies.

[0003] Special geologies such as underground water-containing structures, faults, and fracture zones are prone to coal mine accidents such as water inrush, mud inrush, and collapse during tunneling operations, seriously endangering the lives of workers and causing significant economic losses. During the tunneling process of coal mine roadways and tunnels, advanced prediction of geological doubts is a better means to deal with adverse geological environments. Through advanced prediction and combined with borehole data, the geological structure in front of the tunnel heading can be comprehensively understood, providing a technical basis for the selection of the next tunneling means and potential geological disaster risks, and actually improving the tunneling speed and efficiency. The geophysical prospecting method is based on the physical property differences of the media in front of the tunnel, and infers whether there are abnormal structures in front by detecting the distribution of the geophysical field. The geophysical prospecting method, due to its high efficiency, low cost, and short construction period, solves the problems of high cost, troublesome drilling, and possible secondary hazards of horizontal drilling, and plays a key role in tunnel exploration.

[0004] The advanced drilling method is to place a horizontal drill in the tunnel for horizontal drilling to directly expose the properties, structures, groundwater (water volume, water pressure), and other geological bodies and related characteristics of the geological body in the heading direction of the tunnel. Its main disadvantage is that its lateral detection range is too small.

[0005] The geophysical prospecting method is based on the physical property differences of the media in front of the tunnel, and infers whether there are abnormal structures in front by detecting the distribution of the geophysical field. The geophysical prospecting method, due to its high efficiency, low cost, and short construction period, solves the problems of high cost, troublesome drilling, and possible secondary hazards of horizontal drilling, and plays a key role in tunnel exploration. That is: there is a need for a method combining geophysical prospecting and drilling to achieve a large detection range, and the characteristics of the detected abnormal bodies can be strengthened to meet the long-distance detection and long-time tunneling requirements of rapid tunnel excavation.

[0006] The invention with the publication number CN107589462A discloses a method for advanced detection of direct current in coal mines based on drill pipe power supply. Through drill pipe power supply, the drill pipe is regarded as an equipotential body, and there is no current along the direction of the drill pipe. The current uniformly flows into the coal seam in a direction perpendicular to the drill pipe. Through the transmission effect of the drill pipe, the excitation current is brought to a farther position in front of the heading face, enhancing the excitation of possible anomalies in the area to be explored ahead. When measuring the potential difference behind the heading face or in the borehole, the anomaly amplitude is enhanced, improving the reliability of the interpretation results. However, when the drilling distance of the drill pipe is relatively long, the abnormal response generated by the current excitation in the front may not affect the measured electric potential in the rear, thus unable to meet the measurement requirements for a large range.

[0007] The invention with the publication number CN114924327A discloses a mine borehole wireless electromagnetic wave penetration device and an electromagnetic wave penetration detection method, including: a borehole measurement probe, a transmitting waveform generation circuit, a transmitting signal protection circuit, a receiving signal amplification circuit, and a signal digital-to-analog conversion circuit; the borehole measurement probe transmits or receives electromagnetic wave signals in the borehole; the transmitting waveform generation circuit is connected to the transmitting signal protection circuit to control the transmission of electromagnetic wave signals by the borehole measurement probe; the receiving signal amplification circuit is connected to the signal digital-to-analog conversion circuit to control the reception of electromagnetic wave signals by the borehole measurement probe. This invention conducts penetration for two boreholes, and the penetration result can ensure obtaining geological information within the entire detection area, enabling spatial intersection and verification of information in the intermediate overlapping penetration area, reducing the influence of random interferences such as underground electromagnetic fields. However, this invention transmits and receives electromagnetic waves in the boreholes of two headings, and can obtain geological information between the two roadway boreholes, but cannot obtain geological information in front of the boreholes, that is, the geological information of the entire space, and its detection range is relatively small. Summary of the Invention

[0008] Technical problems to be solved: The present invention discloses a multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement spaces. By using geophysical exploration methods, it makes up for the defect of "seeing only one hole" caused by the too small radial detection range of drilling. By combining drilling and geophysical exploration, the two detection methods complement each other in terms of detection accuracy, detection range, etc., making the detection more accurate and effective, greatly increasing the detection range, thereby reducing the number of advanced detection construction operations, reducing the detection time, and improving the efficiency of underground tunneling.

[0009] Technical solution:

[0010] A multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement spaces, the multi-borehole advanced detection method for coal mine tunneling includes the following steps:

[0011] S1. On the exploration surface of the drilling well to be mined, set two parallel first driving headings and second driving headings; drill a first advanced borehole and a first long-distance borehole on the face of the first driving heading, and drill a second advanced borehole and a second long-distance borehole on the face of the second driving heading; the lengths of the first long-distance borehole and the second long-distance borehole are much greater than those of the first advanced borehole and the second advanced borehole; if the detection results from the drilling show no water inrush and mud inrush, then proceed to step S2; otherwise, record the positions of water inrush and mud inrush and end the process.

[0012] S2. Respectively set a first excitation array with m separately powered supply electrodes at the entrances of the first advanced borehole and the second advanced borehole, and set a first measurement array with n measurement electrodes for measuring electric potential at the entrances of the first long-distance borehole and the second long-distance borehole; the first measurement array measures the current emitted outward by the first excitation array, and the second measurement array measures the current emitted outward by the second excitation array; the m and n are positive integers greater than 1.

[0013] S3. Respectively make the first excitation array and the second excitation array continuously increase the number of powered supply electrodes starting from 1. Each time one more supply electrode is added, use the first measurement array and the second measurement array to measure a set of data respectively.

[0014] S4. Make the first measurement array and the second measurement array move forward at a first fixed interval x. Each time they move one first fixed interval, repeat step S3 until the first measurement array and the second measurement array reach the preset driving distance and then return to the initial position; the x is a positive number greater than 0.

[0015] S5. Make the first excitation array and the second excitation array move forward at a second fixed interval y. Each time they move one second fixed interval, repeat step S3 and step S4 until the first excitation array and the second excitation array reach the tops of the first advanced borehole and the second advanced borehole and then return to the initial position; the y is a positive number greater than 0.

[0016] S6. Respectively perform apparent resistivity analysis on all the measurement data of the first measurement array and the second measurement array to analyze whether there is an abnormal body in the front, and then qualitatively and quantitatively measure the abnormal body through an inversion imaging algorithm to obtain the position and size of the abnormal body.

[0017] Further, in step S1, the first driving heading and the second driving heading need to be driven according to the double-heading driving technology, that is, drive two headings simultaneously, and drive connecting headings to connect the two headings at regular intervals.

[0018] Further, in step S1, the diameters of the first advanced borehole, the second advanced borehole, the first long-distance borehole, and the second long-distance borehole are all 10 cm.

[0019] Further, the first excitation array and the second excitation array are polyhedral plastics with a hexagonal cross-section. The polyhedron matches the borehole so that the polyhedron can freely enter and exit the borehole and move within the borehole. The width of the polyhedron is 7 cm, the length is 12 cm, and the width is 3 cm. This allows the polyhedron to be easily placed into the borehole and ensures that the polyhedron can move within the borehole. Power supply electrodes are arranged on the other 5 vertices except the vertex near the heading face. Each power supply electrode is connected to the wire transfer and fixing device at the last vertex with a wire. A cable is connected after the wire transfer and fixing device. The structure of the measurement array makes the wire connection simple. The arrangement of the electrodes not only ensures the separation between the power supply electrodes to prevent interference between different power supply electrodes under common power supply, but also ensures that the distance between the power supply electrodes is not too far. In the case of single-electrode power supply or multi-electrode power supply, the measurement array can be regarded as a point source, which is convenient for the establishment of the forward numerical simulation model when analyzing data later.

[0020] Further, the first measurement array and the second measurement array are designed as cuboid plastics. A column of measurement electrodes is arranged at a preset interval on the rectangular surface. The measurement electrodes are connected to the wire transfer and fixing device behind the array with wires. A cable is connected after the wire transfer and fixing device; the preset interval between the measurement electrodes makes the measurement data have a difference, and the difference meets the requirement of the minimum difference threshold.

[0021] Further, a segmented plastic pipe is connected behind the first excitation array and the second excitation array, and the cable is placed into the plastic pipe and connected to the downhole server.

[0022] Further, in step S6, apparent resistivity analysis is performed on all the measurement data of the first measurement array and the second measurement array to obtain apparent resistivity curves. The influence of the roadway cavity on the curves is eliminated by the comparison method, and whether there are abnormal bodies in the front is analyzed; the non-structured adaptive grid finite element forward algorithm is used to accurately establish the propagation law of the underground space medium and its current. The Levenberg-Marquardt inversion imaging algorithm based on this forward algorithm is used to qualitatively and quantitatively measure the abnormal body, and information such as the position, size, and resistivity of the abnormal body is obtained. The abnormal body information of the first measurement array and the second measurement array forms sets {Q1} and {Q2} respectively. Then, the Kalman filter is used to fuse sets {Q1} and {Q2}, and the fusion result is marked as the final position and size of the abnormal body and stored in the downhole server.

[0023] The present invention discloses a multi - borehole coal mine tunneling advanced detection system with separated excitation and measurement spaces. The multi - borehole coal mine tunneling advanced detection system includes a first excitation array, a second excitation array, a first measurement array, a second measurement array, an underground server, a first data acquisition unit, a second data acquisition unit, a first DC power supply, and a second DC power supply;

[0024] The first excitation array and the second excitation array are respectively connected to the first DC power supply and the second DC power supply; the first measurement array and the second measurement array are respectively connected to the first data acquisition unit and the second data acquisition unit; the first data acquisition unit, the second data acquisition unit, the first DC power supply, and the second DC power supply are all connected to the underground server, and according to the control instructions of the underground server, the power supply states of the first DC power supply and the second DC power supply, as well as the acquisition states of the first data acquisition unit and the second data acquisition unit, are switched;

[0025] The underground server, according to the multi - borehole coal mine tunneling advanced detection method as described above, drives the first data acquisition unit and the second data acquisition unit to collect multiple groups of measurement data, performs noise reduction pre - processing on the collected multiple groups of measurement data, then performs apparent resistivity analysis on the pre - processed measurement data to analyze whether there are abnormal bodies in the front, and then qualitatively and quantitatively measures the abnormal bodies through an inversion imaging algorithm to obtain the position and size of the abnormal bodies.

[0026] Beneficial effects:

[0027] First, the multi - borehole coal mine tunneling advanced detection method with separated excitation and measurement spaces of the present invention uses geophysical exploration methods to make up for the defect of "seeing only one hole" caused by the too small radial detection range of drilling. By combining drilling and geophysical exploration, the two detection methods complement and integrate each other in terms of detection accuracy, detection range, etc., making the detection more accurate and effective.

[0028] Second, placing the measurement array and the excitation array into the front - facing boreholes makes them closer to the front - facing geology, greatly enhancing the characteristics of the measured abnormal bodies. By moving the measurement array over a long distance in the long - distance borehole, the detection range is increased. When the measurement array completes one measurement, the excitation array also moves forward a certain distance and then measures again, further increasing the detection range. At the same time, due to the above - mentioned moving measurement operation, a large amount of data is collected, and then more accurate geological conditions in the front can be obtained through the inversion operation.

[0029] Thirdly, in addition, by adopting double driving headings, two sets of measurement arrays and excitation arrays are arranged and measured simultaneously, which further increases the measurement range. Moreover, the measurement results of the two driving headings can be verified and integrated with each other, improving the detection accuracy. This method greatly increases the detection range, thereby reducing the number of advance detection operations and the detection time, and improving the tunneling efficiency underground.

[0030] Fourthly, when the double-heading tunneling technology is used to drive two parallel headings, the long-distance local ventilator air supply system for single-heading tunneling can be changed into a fully negative-pressure ventilation system with one driving heading for intake air and one driving heading for return air, and a local ventilation system with a normal distance for the tunneling face. This can effectively increase the air supply volume of the tunneling face and solve the ventilation problem for rapid tunneling in high-gas working faces. Brief Description of the Drawings

[0031] Figure 1 Schematic structural diagram of a multi-borehole coal mine tunneling advance detection system with separated excitation and measurement spaces according to an embodiment of the present invention;

[0032] Figure 2 Schematic structural diagram of the excitation array;

[0033] Figure 3 Schematic structural diagram of the measurement array. Detailed Embodiment

[0034] The following embodiments can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way.

[0035] This embodiment discloses a multi-borehole coal mine tunneling advance detection method with separated excitation and measurement spaces. The device relied on by this method is as Figure 1Multi-borehole advanced detection system for coal mine tunneling: Two parallel tunneling headings I and II; Advanced borehole I and long-distance borehole I are located at the face of tunneling heading I, and advanced borehole II and long-distance borehole II are located at the face of tunneling heading II; Movable excitation arrays I and II are respectively arranged in advanced boreholes I and II, and there are 5 power supply electrodes in excitation arrays I and II that can be independently powered; Movable measurement arrays I and II are respectively arranged in long-distance boreholes, and there are dozens of measurement electrodes for measuring electric potential in measurement arrays I and II; Excitation arrays I and II are respectively connected to DC power supplies I and II arranged in tunneling headings I and II, and the DC power supplies I and II need to be connected to return electrodes at the back; Measurement arrays I and II are respectively connected to data acquisition units I and II arranged in tunneling headings I and II; The DC power supplies I and II, and data acquisition units I and II are all connected to the underground server through Ethernet. The underground server controls the DC power supply of excitation array I to supply power, and at the same time measurement array I measures, processes the measured data through methods such as noise reduction, and stores and analyzes the processed data. Similarly, the underground server controls excitation array II and measurement array II in the same way.

[0036] The multi-borehole advanced detection method for coal mine tunneling includes the following steps:

[0037] S1: Drill advanced borehole I and long-distance borehole I in tunneling heading I, and similarly drill advanced borehole II and long-distance borehole II in tunneling heading II. If there is no water inrush and mud inrush in the detection results obtained by drilling, then put excitation arrays I and II into advanced boreholes I and II respectively, and put measurement arrays I and II into long-distance boreholes I and II respectively.

[0038] In step S1, it is necessary to drill advanced boreholes and long-distance boreholes at the faces of tunneling headings I and II. Assume that the diameters of the advanced boreholes and long-distance boreholes are both 10 cm, the length of the advanced borehole is 80 m - 100 m, and the length of the long-distance borehole is longer than that of the advanced borehole and can reach several hundred meters. Therefore, one construction of the long-distance borehole can meet the needs of multiple detections. After that, when conducting detections, only the construction of advanced boreholes needs to be carried out at the faces of tunneling headings I and II. Since drilling is the most direct advanced detection method to obtain geological information ahead, all four boreholes can play a role in detection. Its detection accuracy is high but its detection radius is small, and its detection radius is in the range of a few centimeters to dozens of centimeters with the well axis of the drilling well as the center and the radial radius. In step S1, tunneling heading I and tunneling heading II are tunneling simultaneously according to the double-heading tunneling technology, and a connecting roadway is excavated to connect the two roadways every certain distance (such as 100 m) of tunneling.

[0039] S2: Increase the number of powered supply electrodes of the excitation array I from 1 to 5 continuously, and measure a set of data for the measurement array I each time the number of powered supply electrodes is increased. Then, stop power supply to the excitation array I. Similarly, apply the same measures as above to the excitation array II and the measurement array II.

[0040] S3: The measurement arrays I and II move forward at intervals of a first preset interval (e.g., 20 m). Repeat step S2 for each interval moved. The moving distance is related to the drilling and tunneling distance. Assume that after moving 80 m in total, return to the initial position.

[0041] S4: When the above steps S1 - S3 are completed, the excitation arrays I and II move forward at intervals of a second preset interval (e.g., 15 m). Repeat steps S2 - S3 for each interval moved. The moving distance is related to the drilling. Assume that after moving 45 m in total, return to the initial position.

[0042] S5: Analyze the data measured by the measurement array I in the downhole server to obtain the position and size of the anomaly, and form a set {Q1}; similarly, analyze the data measured by the measurement array II in the downhole server to obtain the position and size of the anomaly, and form a set {Q2}. The sets {Q1} and {Q2} are fused using Kalman filtering in the downhole server, and the fusion result is marked as the position and size of the anomaly and stored in the downhole server.

[0043] In step S5, calculate the data measured by the measurement array I and the measurement array II in the downhole server according to the calculation formula of apparent resistivity to determine whether there is an anomaly ahead. Then, through the inversion imaging algorithm, qualitatively and quantitatively measure the anomaly ahead to determine the position and size of the anomaly. The calculation results of the measurement data of the measurement array I and the measurement array II can be mutually verified and fused, improving the detection accuracy.

[0044] S6: After completing the above steps and dealing with the abnormal bodies detected, the coal mine roadheader can advance forward. Specifically, apparent resistivity analysis is performed on all the measurement data of the first measurement array and the second measurement array to obtain apparent resistivity curves. The influence of the roadway cavity on the curves is eliminated through the comparison method, and whether there are abnormal bodies ahead is analyzed. The unstructured adaptive grid finite element forward algorithm is used to accurately establish the propagation law of the underground space medium and its current. Through the Levenberg-Marquardt inversion imaging algorithm based on this forward algorithm, qualitative and quantitative measurements are performed on the abnormal bodies to obtain information such as the position, size, and resistivity of the abnormal bodies. The abnormal body information of the first measurement array and the second measurement array respectively forms set {Q1} and set {Q2}. Then, the Kalman filter is used to fuse set {Q1} and set {Q2}, and the fusion result is marked as the final position and size of the abnormal body and stored in the underground server. Taking the example that the measurement array has moved 80 m before, the coal mine roadheader can advance 100 m forward this time. After that, steps S1-S5 will be repeated again, thereby reducing the number of advance detection construction times, reducing the detection time, and improving the efficiency of underground tunneling.

[0045] As one of the preferred examples, the first excitation array and the second excitation array are polyhedron plastics with a hexagonal cross-section. The polyhedron matches the borehole so that the polyhedron can freely enter and exit the borehole and move within the borehole. For example, the width of the polyhedron is 7 cm, the length is 12 cm, and the width is 3 cm. This enables the polyhedron to be easily placed into the borehole and ensures that the polyhedron can move within the borehole. Power supply electrodes are arranged at the other 5 vertices except the vertex near the heading face. Each power supply electrode is connected to the wire transfer and fixing device at the last vertex with wires. A cable is connected after the wire transfer and fixing device. The structure of the measurement array makes the wire connection simple. The arrangement of the electrodes not only ensures the separation between the power supply electrodes to prevent interference between different power supply electrodes under the condition of common power supply, but also makes the distance between the power supply electrodes not too far. In the case of single-electrode power supply or multi-electrode power supply, the measurement array can be regarded as a point source, which is convenient for the establishment of the forward numerical simulation model when analyzing data later. As Figure 2 shown, the excitation arrays I and II are polyhedron plastics with a hexagonal top view. Power supply electrodes are arranged at 5 vertices on the hexagonal surface of the plastic. Each power supply electrode is connected to the wire transfer and fixing device at the last vertex with wires. A cable is connected after the wire transfer and fixing device.

[0046] To ensure a certain interval between the measurement electrodes so that there is a certain difference between the measurement data, the first measurement array and the second measurement array are designed as cuboid plastics. For example, the cuboid has a length of 5 m, a width of 7 cm, and a height of 3 cm. A row of measurement electrodes is arranged at intervals of 50 cm on the rectangular surface. The measurement electrodes are connected to the wire transfer and fixing device at the rear of the array with wires, and a cable is connected after the wire transfer and fixing device. As Figure 3 shown, the measurement arrays I and II are cuboid plastics. A row of measurement electrodes is arranged on the rectangular surface. The measurement electrodes are connected to the wire transfer and fixing device at the rear of the array with wires, and a cable is connected after the wire transfer and fixing device. Since the excitation arrays I and II need to move in the hole, the main realization of the movement is that segmented plastic pipes are connected to the rear of each array. The cable is placed in this pipe. This segmented pipe has a certain flexibility, can adapt to the change of the drilling direction, and can also withstand tensile and compressive forces. By pulling and pushing the pipe, the movement of each array can be realized, and the movement distance of the array can be controlled.

[0047] The above are only the preferred embodiments of the present invention, and do not impose any formal restrictions on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention; any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement, characterized in that, the multi-borehole advanced detection method for coal mine tunneling includes the following steps: S1. Set two mutually parallel first tunneling headings and second tunneling headings on the exploration surface of the drilling well to be excavated; drill a first advanced borehole and a first long-distance borehole on the face of the first tunneling heading, and drill a second advanced borehole and a second long-distance borehole on the face of the second tunneling heading; the lengths of the first long-distance borehole and the second long-distance borehole are much greater than those of the first advanced borehole and the second advanced borehole; if the detection results obtained from the drilling show no water inrush and mud inrush, then proceed to step S2; otherwise, record the positions of water inrush and mud inrush and end the process; S2. Respectively set a first excitation array with m separately powered supply electrodes at the entrances of the first advanced borehole and the second advanced borehole, and set a first measurement array with n measurement electrodes for measuring electric potential at the entrances of the first long-distance borehole and the second long-distance borehole; the first measurement array measures the current emitted outward by the first excitation array, and the second measurement array measures the current emitted outward by the second excitation array; m and n are positive integers greater than 1; S3. Respectively make the first excitation array and the second excitation array continuously increase the number of powered supply electrodes starting from 1, and for each increase in one supply electrode, use the first measurement array and the second measurement array to measure a set of data respectively; S4. Make the first measurement array and the second measurement array move forward at a first fixed interval x, and repeat step S3 for each movement of one first fixed interval until the first measurement array and the second measurement array reach the preset tunneling distance and then return to the initial position; x is a positive number greater than 0; S5. Make the first excitation array and the second excitation array move forward at a second fixed interval y, and repeat step S3 and step S4 for each movement of one second fixed interval until the first excitation array and the second excitation array reach the tops of the first advanced borehole and the second advanced borehole and then return to the initial position; y is a positive number greater than 0; S6. Respectively perform apparent resistivity analysis on all the measurement data of the first measurement array and the second measurement array to analyze whether there is an abnormal body in the front, and then qualitatively and quantitatively measure the abnormal body through an inversion imaging algorithm to obtain the position and size of the abnormal body.

2. The multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement according to claim 1, characterized in that, in step S1, the first tunneling heading and the second tunneling heading are tunneled according to the double-heading tunneling technology, tunneling two headings simultaneously, and driving connecting roadways at regular intervals to connect the two headings.

3. The multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement according to claim 1, characterized in that, in step S1, the diameters of the first advanced borehole, the second advanced borehole, the first long-distance borehole and the second long-distance borehole are all 10 cm.

4. The multi-borehole advanced detection method for coal mine tunneling with separated excitation and measurement according to claim 1, characterized in that, The first excitation array and the second excitation array are polyhedral plastics with a hexagonal cross-section. The polyhedron matches the borehole so that the polyhedron can freely enter and exit the borehole and move within the borehole. Power supply electrodes are arranged at the other 5 vertices except the vertex near the heading face, and each power supply electrode is connected by a wire to a wire transfer and fixing device at the last vertex, and a cable is connected after the wire transfer and fixing device.

5. The multi-borehole coal mine tunneling advanced detection method with spatial separation of the excitation array and the measurement array according to claim 1, characterized in that, the first measurement array and the second measurement array are structurally designed as cuboid plastics. A column of measurement electrodes is arranged at a preset interval on the rectangular surface, and the measurement electrodes are connected by wires to a wire transfer and fixing device behind the array, and a cable is connected after the wire transfer and fixing device; the preset interval between the measurement electrodes enables the measurement data to have a difference and the difference meets the requirement of the minimum difference threshold.

6. The multi-borehole coal mine tunneling advanced detection method with spatial separation of excitation and measurement according to claim 3, characterized in that, a segmented plastic pipe is connected behind the first excitation array and the second excitation array, and the cable is placed in the plastic pipe and connected to the underground server.

7. The multi-borehole coal mine tunneling advanced detection method with spatial separation of excitation and measurement according to claim 1, characterized in that, in step S6, apparent resistivity analysis is respectively performed on all the measurement data of the first measurement array and the second measurement array to obtain apparent resistivity curves. The influence of the roadway cavity on the curves is eliminated by the comparison method, and whether there is an abnormal body in the front is analyzed; the non-structured adaptive grid finite element forward algorithm is used to accurately establish the propagation law of the underground space medium and its current, and the Levenberg-Marquardt inversion imaging algorithm based on this forward algorithm is used to qualitatively and quantitatively measure the abnormal body to obtain information such as the position, size and resistivity of the abnormal body. The abnormal body information of the first measurement array and the second measurement array respectively forms a set {Q1} and a set {Q2}, and then the Kalman filter is used to fuse the set {Q1} and the set {Q2}, and the fusion result is marked as the final position and size of the abnormal body and stored in the underground server.

8. A multi-borehole coal mine tunneling advanced detection system with spatial separation of excitation and measurement, characterized in that, the multi-borehole coal mine tunneling advanced detection system includes a first excitation array, a second excitation array, a first measurement array, a second measurement array, an underground server, a first data acquisition unit, a second data acquisition unit, a first DC power supply and a second DC power supply; the first excitation array and the second excitation array are respectively connected to the first DC power supply and the second DC power supply; the first measurement array and the second measurement array are respectively connected to the first data acquisition unit and the second data acquisition unit; the first data acquisition unit, the second data acquisition unit, the first DC power supply and the second DC power supply are all connected to the underground server, and the power supply states of the first DC power supply and the second DC power supply, and the acquisition states of the first data acquisition unit and the second data acquisition unit are switched according to the control instructions of the underground server; The downhole server drives the first data acquisition unit and the second data acquisition unit to collect multiple sets of measurement data according to the multi-borehole coal mine tunneling advanced detection method in any one of claims 1-6, performs noise reduction preprocessing on the collected multiple sets of measurement data, then performs apparent resistivity analysis on the preprocessed measurement data to analyze whether there is an abnormal body in the front, and then qualitatively and quantitatively measures the abnormal body through an inversion imaging algorithm to obtain the position and size of the abnormal body.

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