Drill hole installation method for microseismic electrical method coupling water inrush early warning and monitoring

Abstract

The invention belongs to the technical field of water inrush early warning and monitoring, and particularly relates to a drill hole mounting method for micro-seismic electrical method coupling water inrush early warning and monitoring, which comprises the following steps of: 1, strictly forming a first drill hole and a second drill hole in a roadway according to the design, measuring the inclination after the first drill hole and the second drill hole are drilled, 2, according to the actual situation of the working face, a first monitoring station and a second monitoring station are installed in a roadway, two YZD12-C mining intrinsic safety type micro-seismic electrical method parallel monitors are arranged in each of the first monitoring station and the second monitoring station, and the mining intrinsic safety type micro-seismic electrical method parallel monitors are monitored by means of grouting active disturbance; by means of the method, a comprehensive system of the rock mass and the underground water flow field is disturbed, micro-seismic events are induced, passive iso-seismic monitoring of a conventional method is converted into active seismic induction monitoring, the hidden water guiding structure can be accurately detected, and the accuracy of monitoring and early warning can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of water inrush early warning monitoring, and in particular relates to a drilling installation method for microseismic electrical method coupling water inrush early warning monitoring. Background Art

[0002] Among mining accidents, water disasters account for a large proportion. The three conditions that must be met for water disasters to occur in mines are water source, water volume and water conduction channels. Among these three conditions, the aquifer, which plays a decisive role in water source and water volume, has regional and planar distribution characteristics in its recharge and discharge conditions, so it is often easy to identify and predict and analyze. However, water conduction channels are extremely local and hidden. Therefore, most water inrush disasters have the characteristics of unpredictable water conduction channels, which are specifically manifested in: the unpredictability of primary water conduction channels; the unpredictability of newly formed water conduction channels affected by mining. The formation and occurrence of mine water disasters have a change process from pregnancy to occurrence. Different stages of this change process have corresponding precursors. Microseismic monitoring is to find the specific parameters of the water conduction channel, and according to the changes in water source, water volume, water temperature and other factors, combined with multidisciplinary theories such as mine pressure and hydrogeology, advance prediction and early warning of water inrush are carried out.

[0003] The traditional application of microseismic electromagnetic monitoring technology is to monitor passive seismic sources. However, in the process of studying water prevention and control, it is necessary to detect water channels before water inrush occurs in mines. However, water in a dynamic equilibrium state often cannot trigger microseismic events. In the process of passive isoseismic monitoring, it is difficult to monitor hidden water-conducting structures, and the laws of rock fracture and movement in a small area cannot be revealed.

[0004] In order to solve the above problems, the present application proposes a drilling installation method for microseismic electrical coupling water inrush early warning monitoring. Summary of the invention

[0005] The present invention provides a drilling installation method for microseismic electrical method coupling water inrush early warning monitoring, which can effectively solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a drilling installation method for microseismic electrical coupling water inrush early warning monitoring, comprising the following steps:

[0007] Step 1: Strictly according to the design, the first borehole and the second borehole are opened in the tunnel, and after the first borehole and the second borehole are drilled, the inclination is measured to obtain the trajectory parameters of the first borehole and the second borehole;

[0008] Step 2: According to the actual situation of the working face, install the first monitoring station and the second monitoring station in the tunnel, and arrange two YZD12-C mine-use intrinsically safe microseismic electrical parallel monitoring instruments in the first monitoring station and the second monitoring station respectively;

[0009] Step 3: Use the tunnel roof, the first borehole and the second borehole to arrange the survey lines on site, arrange the electrical survey lines and microseismic sensors in the first borehole and the second borehole respectively, and arrange two microseismic sensors on the tunnel roof at each water exploration and drainage hole to form a three-dimensional monitoring system for the working face roof;

[0010] Step 4: After the electrical measurement lines and microseismic sensors are arranged in the first borehole and the second borehole, the locking grouting mechanisms are installed at the ports of the first borehole and the second borehole respectively;

[0011] Step 5: After the lock-mouth grouting mechanism is installed, the drilling construction team will inject grout into the first and second boreholes to seal the holes. The grouting must be completed after the grouting returns. Finally, the mining company will be responsible for the daily maintenance of the boreholes.

[0012] As a preferred method of drilling installation for microseismic electrical coupling water inrush early warning monitoring of the present invention, the average inclination angle allowable error between the first borehole and the second borehole is -5° to 10°.

[0013] As a preferred drilling installation method for microseismic electrical coupling water inrush early warning monitoring of the present invention, eight groups of first boreholes are arranged, and the eight groups of first boreholes are facing the inside of the working face, and the eight groups of first boreholes are numbered H1-2, H3-2, H4-2, H6-1, J2-2, J4-3, J5-3, and J7-3, respectively.

[0014] As a preferred drilling installation method for microseismic electrical coupling water inrush early warning monitoring of the present invention, four groups of second boreholes are arranged, and the four groups of second boreholes face outside the working face, and the four groups of second boreholes are numbered H2-4, H5-5, J3-5, and J6-5, respectively.

[0015] As a preferred drilling installation method for microseismic electrical coupling water inrush early warning monitoring of the present invention, the first borehole and the second borehole are evenly arranged on both sides of the tunnel, and the depth of the first borehole and the depth of the second borehole are greater than 120m.

[0016] As a preferred method of drilling installation for microseismic electrical coupling water inrush early warning monitoring of the present invention, the microseismic sensors are installed equidistantly in the first borehole and the second borehole, and four microseismic sensors are arranged in each group of boreholes.

[0017] As a preferred drilling installation method for microseismic electrical coupling water inrush early warning monitoring of the present invention, the locking grouting mechanism includes an anchor rod, a locking sleeve, a locking plate, a UPVC pipe, a grouting pipe, a first valve, and a second valve. The anchor rod is axially equidistantly installed on the periphery of the first borehole and the second borehole, the locking sleeve is inserted into the first borehole and the second borehole, the locking plate is fixed to the end of the locking sleeve by the anchor rod, the UPVC pipe and the grouting pipe are both fixedly inserted on the locking plate, and the first valve and the second valve are respectively installed at one end of the UPVC pipe and one end of the grouting pipe.

[0018] As a preferred drilling installation method for microseismic electrical coupling water inrush early warning monitoring of the present invention, one end of the grouting pipe extends one meter into the borehole, the electrical measurement line is fixedly installed on the outside of the UPVC pipe, and the outer diameter of the locking sleeve matches the inner diameter of the borehole.

[0019] As a preferred drilling installation method for microseismic electrical coupling water inrush early warning monitoring of the present invention, the electrical measurement line is sent into the borehole by a UPVC pipe and coupled by grouting, an extension line socket is left at the borehole mouth, a microseismic sensor interface is set at one end of the extension line, and the microseismic sensor interface is connected to the borehole mouth extension line 40m away from the socket to transmit data to the first monitoring station, the first monitoring station is first arranged between borehole H3-2 and borehole H4-2, the measurement line arrangement of borehole H5-5 and borehole H4-2 is consistent with the measurement line arrangement of borehole H6-1, and the length of different borehole extension lines can be adjusted according to the length of the tunnel.

[0020] As a preferred drilling installation method for microseismic electrical coupling water inrush early warning monitoring of the present invention, the extension line is hung on the side of the tunnel, and is hung and protected strictly in accordance with the requirements of the mine, and the connection interface is connected using a corresponding explosion-proof junction box.

[0021] According to the project requirements and the actual situation of the working face, a total of 12 boreholes are designed and arranged. All 12 boreholes use existing water exploration and drainage boreholes. The specific drilling parameters are shown in the table below.

[0022] There are four groups of second drilling holes facing outside the working surface, which are numbered H2-4, H5-5, J3-5, and J6-5 respectively. There are eight groups of first drilling holes facing inside the working surface. The first drilling holes of the 13101 working surface are numbered H1-2, H3-2, H4-2, H6-1, J2-2, J4-3, J5-3, and J7-3 respectively. The specific drilling parameters are as follows.

[0023] Drilling parameters list

[0024]

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] Active grouting disturbance is used to disturb the integrated system of rock mass and groundwater flow field, inducing microseismic events, transforming the conventional "passive isoseismic" monitoring method into "active induced seismic" monitoring, which can accurately detect hidden water-bearing structures and effectively improve the accuracy of monitoring and early warning.

[0027] According to the actual situation of the working face, this microseismic electrical coupling monitoring system is designed with 2 monitoring stations. Each monitoring station is equipped with 2 YZD12-C mining intrinsically safe microseismic electrical parallel monitoring instruments. Electrical survey lines and microseismic sensors are arranged in 12 exploration and drainage boreholes in the tunnel respectively. At the same time, microseismic sensors are arranged on the top of each exploration and drainage hole to form a three-dimensional monitoring system for the roof of the working face. The monitoring area is the damage depth of the roof of the 13101 working face. The design strike length of the 13101 working face monitoring section is about 1000m and the width is 330m. The microseismic electrical coupling monitoring of half of the area within 500m of the cut-eye is completed in a one-time arrangement. After that, the observation system monitoring of the entire working face can be completed by rolling the survey line and monitoring base station once. The construction is convenient, the monitoring range is large, and the monitoring accuracy is high.

[0028] When the working face starts to be mined, microseismic electrical data are collected through the double lanes. When a certain distance is mined, the electrical survey line is damaged to a certain extent. At this time, only the extension line part is retained, and the original extension line connector is connected to the subsequent borehole. Taking the return air lane of the 13101 working face as an example, the survey line of the H6-1 borehole is damaged as it is mined. The extension line connected to the H6-1 borehole is moved to the position of the H4-2 borehole survey line. The H5-5 borehole survey line is damaged as it is mined. The extension line connected to H5-5 is moved to the position of the H2-4 borehole survey line. The H4-2 borehole survey line is damaged as it is mined. At this time, the first monitoring station needs to be moved to the monitoring position after the station is moved, and the extension line connected to H4-2 is moved to the position of the H1-2 borehole survey line. After the station is moved, the secondary monitoring and observation system for a single lane is arranged until the monitoring of the entire lane is completed. This is convenient for construction and has high monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 A plan view of the drilling layout of the present invention;

[0031] Figure 2 A plan view of the observation system layout of the present invention;

[0032] Figure 3 This is a schematic diagram of the first observation of a single lane of the present invention;

[0033] Figure 4 This is a layout diagram of the observation system after the station is moved according to the present invention;

[0034] Figure 5 It is a cross-sectional plan view of the locking grouting mechanism of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the locking grouting mechanism in the present invention;

[0036] Figure 7 It is a flow chart of drilling installation of the present invention.

[0037] In the figure:

[0038] 1. First drilling;

[0039] 2. Second drilling;

[0040] 3. The first monitoring station;

[0041] 4. Second monitoring station;

[0042] 5. Electrical survey line;

[0043] 6. Microseismic sensor;

[0044] 7. Locking grouting mechanism; 701. Anchor rod; 702. Locking sleeve; 703. Locking plate; 704. UPVC pipe; 705. Grouting pipe; 706. First valve; 707. Second valve. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Examples, such as Figure 1-7 As shown, a drilling installation method for microseismic electrical method coupling water inrush early warning monitoring includes the following steps:

[0047] Step 1: Strictly according to the design, the first borehole 1 and the second borehole 2 are opened in the tunnel, and after the drilling of the first borehole 1 and the second borehole 2 is completed, the inclination measurement is performed to obtain the trajectory parameters of the first borehole 1 and the second borehole 2;

[0048] Step 2: According to the actual situation of the working face, the first monitoring station 3 and the second monitoring station 4 are installed in the tunnel, and two YZD12-C mine-used intrinsically safe microseismic electrical method parallel monitoring instruments are arranged in the first monitoring station 3 and the second monitoring station 4 respectively;

[0049] Step 3: Use the tunnel roof, the first borehole 1 and the second borehole 2 to arrange the survey lines on site, arrange the electrical survey lines 5 and the microseismic sensors 6 in the first borehole 1 and the second borehole 2, and arrange two microseismic sensors 6 at the tunnel roof of each water exploration and drainage hole to form a three-dimensional monitoring system for the roof of the working face;

[0050] Step 4: After the electrical measurement line 5 and the microseismic sensor 6 are arranged in the first borehole 1 and the second borehole 2, the locking grouting mechanism 7 is installed at the end of the first borehole 1 and the end of the second borehole 2 respectively;

[0051] Step 5: After the lock grouting mechanism 7 is installed, the drilling construction team will inject grout into the first borehole 1 and the second borehole 2 to seal the holes. The grouting must be completed after the grouting returns. Finally, the mine owner is responsible for the daily maintenance of the boreholes.

[0052] refer to Figure 1 - Figure 7 As shown:

[0053] The allowable error of the average inclination angles of the first borehole 1 and the second borehole 2 is -5° to 10°.

[0054] There are eight groups of first drill holes 1, and the eight groups of first drill holes 1 face the inside of the working surface. The eight groups of first drill holes 1 are numbered H1-2, H3-2, H4-2, H6-1, J2-2, J4-3, J5-3, and J7-3, respectively.

[0055] Four groups of second bore holes 2 are provided, and the four groups of second bore holes 2 face outside the working surface. The four groups of second bore holes 2 are numbered H2-4, H5-5, J3-5, and J6-5, respectively.

[0056] The first borehole 1 and the second borehole 2 are evenly arranged on both sides of the tunnel, and the depth of the first borehole 1 and the depth of the second borehole 2 are greater than 120m.

[0057] The microseismic sensors 6 are installed in the first borehole 1 and the second borehole 2 at equal distances, and four microseismic sensors 6 are arranged in each group of boreholes.

[0058] The locking grouting mechanism 7 includes an anchor rod 701, a locking sleeve 702, a locking plate 703, a UPVC pipe 704, a grouting pipe 705, a first valve 706, and a second valve 707. The anchor rod 701 is axially equidistantly installed on the periphery of the first borehole 1 and the second borehole 2. The locking sleeve 702 is inserted in the first borehole 1 and the second borehole 2. The locking plate 703 is fixed to the end of the locking sleeve 702 through the anchor rod 701. The UPVC pipe 704 and the grouting pipe 705 are both fixedly inserted on the locking plate 703. The first valve 706 and the second valve 707 are respectively installed at one end of the UPVC pipe 704 and one end of the grouting pipe 705. During installation, the anchor rod 701 is first drilled around the borehole to install it. After the anchor rod 701 is installed, the locking sleeve 702 is inserted in the first borehole 1 and the second borehole 2. The UPVC pipe 704 and the grouting pipe 705 are inserted into the borehole 1 and the second borehole 2, and then the UPVC pipe 704 and the grouting pipe 705 are inserted into the borehole. When the UPVC pipe 704 is inserted into the borehole, the electrical method measuring line 5 can be brought into the borehole to complete the arrangement of the electrical method measuring line 5. After the UPVC pipe 704 is inserted into the specified depth, the locking sleeve 702 and the locking plate 703 are locked and fixed by the anchor rod 701 to complete the installation of the locking grouting mechanism 7. After the installation is completed, grouting can be performed into the borehole through the grouting pipe 705. The active disturbance means of grouting can disturb the integrated system of the rock mass and the groundwater flow field, induce microseismic events, and transform the conventional method of "passive isoseismic" monitoring into "active induced seismic" monitoring, which can accurately detect hidden conductive water-bearing structures and effectively improve the accuracy of monitoring and early warning.

[0059] One end of the grouting pipe 705 extends one meter into the borehole, the electrical measurement line 5 is fixedly installed on the outside of the UPVC pipe 704, and the outer diameter of the locking sleeve 702 matches the inner diameter of the borehole.

[0060] The electrical survey line 5 is sent into the borehole using a UPVC pipe and coupled by grouting. An extension line socket is left at the borehole mouth. A microseismic sensor interface is set at one end of the extension line. The microseismic sensor interface is connected to the borehole mouth extension line 40m away from the socket to transmit data to the first monitoring station 3. The first monitoring station 3 is first arranged between boreholes H3-2 and H4-2. The survey line arrangement of boreholes H5-5 and H4-2 is consistent with that of borehole H6-1. The length of different borehole extension lines can be adjusted according to the length of the tunnel.

[0061] The extension line is hung on the side of the tunnel and is suspended and protected strictly in accordance with the requirements of the mine, and the connection interface is connected using the corresponding explosion-proof junction box.

[0062] In this embodiment: after drilling holes on both sides of the tunnel, holes are drilled around the boreholes to install anchor rods 701. After the anchor rods 701 are installed, the locking sleeve 702 is inserted and installed in the first borehole 1 and the second borehole 2, and then the UPVC pipe 704 and the grouting pipe 705 are inserted into the boreholes. When the UPVC pipe 704 is inserted into the borehole, the electrical method measurement line 5 can be brought into the borehole to complete the arrangement of the electrical method measurement line 5. After the UPVC pipe 704 is inserted into the specified depth, the locking sleeve 702 and the locking plate 703 are locked and fixed by the anchor rod 701 to complete the installation of the locking grouting mechanism 7. After the installation is completed, grouting can be performed into the borehole through the grouting pipe 705. By using the active disturbance means of grouting, the integrated system of the rock mass and the groundwater flow field can be disturbed to induce microseismic events, and the conventional method of "passive isoseismic" monitoring is transformed into "active induced seismic" monitoring, which can accurately detect hidden conductive water-bearing structures;

[0063] Then, the first monitoring station 3 and the second monitoring station 4 are installed in the tunnel. After the installation of the first monitoring station 3 and the second monitoring station 4, two YZD12-C mine-use intrinsically safe microseismic electrical parallel monitoring instruments are arranged in each monitoring station. Then, electrical survey lines 5 and microseismic sensors 6 are arranged in the 12 exploration and drainage boreholes in the tunnel. At the same time, microseismic sensors 6 are arranged on the tunnel roof at each exploration and drainage hole to form a three-dimensional monitoring system for the roof of the working face. The monitoring area is the damage depth of the roof of the 13101 working face. The design strike length of the 13101 working face monitoring section is about 1000m and the face width is 330m. The microseismic electrical coupling monitoring of half of the area within 500m of the cut-eye is completed in a one-time arrangement. After rolling the survey line and the monitoring base station once, the observation system monitoring of the entire working face can be completed.

[0064] When the working face starts to be mined, microseismic electrical data are collected through the double lanes. When a certain distance is mined, the electrical survey line 5 is damaged to a certain extent. At this time, only the extension line part is retained, and the original extension line joint is connected to the subsequent borehole. Taking the return air lane of the 13101 working face as an example, the survey line of the H6-1 borehole is damaged as the mining is carried out. The extension line connected to the H6-1 borehole is moved to the position of the H4-2 borehole survey line. The H5-5 borehole survey line is damaged as the mining is carried out. The extension line connected to H5-5 is moved to the position of the H2-4 borehole survey line. The H4-2 borehole survey line is damaged as the mining is carried out. At this time, the first monitoring station needs to be moved to the monitoring position after the station is moved, and the extension line connected to H4-2 is moved to the position of the H1-2 borehole survey line. After the station is moved, the secondary monitoring and observation system of the single lane is arranged until the monitoring of the mining of the entire lane is completed.

[0065] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drilling installation method for microseismic electrical coupling water inrush early warning monitoring, characterized in that: The following steps are involved: Step 1: Strictly according to the design, a first borehole (1) and a second borehole (2) are opened in the tunnel, and after the first borehole (1) and the second borehole (2) are drilled, inclination measurement is performed to obtain trajectory parameters of the first borehole (1) and the second borehole (2); Step 2: According to the actual situation of the working face, a first monitoring station (3) and a second monitoring station (4) are installed in the tunnel, and two YZD12-C mining intrinsically safe microseismic electrical parallel monitoring instruments are arranged in the first monitoring station (3) and the second monitoring station (4); Step 3: Using the tunnel roof, the first borehole (1) and the second borehole (2) to arrange survey lines on site, respectively, arranging electrical survey lines (5) and microseismic sensors (6) in the first borehole (1) and the second borehole (2), respectively, and arranging two microseismic sensors (6) on the tunnel roof at each water exploration and drainage hole, thereby forming a three-dimensional monitoring system for the working face roof; Step 4: After the electrical measurement line (5) and the microseismic sensor (6) are arranged in the first borehole (1) and the second borehole (2), a locking grouting mechanism (7) is installed at the end of the first borehole (1) and the end of the second borehole (2); Step 5: After the locking grouting mechanism (7) is installed, the drilling construction team will inject grout into the first borehole (1) and the second borehole (2) to seal the holes. The grouting must be completed after the grouting returns. Finally, the mining company will be responsible for the daily maintenance of the boreholes.

2. A drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 1, characterized in that: The allowable error of the average inclination angles of the first borehole (1) and the second borehole (2) is -5° to 10°.

3. The drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 1 is characterized by: The first drill holes (1) are arranged in eight groups, and the eight groups of the first drill holes (1) face the inside of the working surface. The eight groups of the first drill holes (1) are numbered H1-2, H3-2, H4-2, H6-1, J2-2, J4-3, J5-3, and J7-3, respectively.

4. The drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 1 is characterized in that: Four groups of the second bore holes (2) are provided, and the four groups of the second bore holes (2) face outwards from the working surface. The four groups of the second bore holes (2) are numbered H2-4, H5-5, J3-5, and J6-5, respectively.

5. The drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 1 is characterized in that: The first borehole (1) and the second borehole (2) are evenly arranged on both sides of the tunnel, and the depth of the first borehole (1) and the depth of the second borehole (2) are greater than 120m.

6. The drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 1 is characterized by: The microseismic sensors (6) are installed in the first borehole (1) and the second borehole (2) at equal intervals, and four microseismic sensors (6) are arranged in each group of boreholes.

7. The drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 1 is characterized by: The locking grouting mechanism (7) comprises an anchor rod (701), a locking sleeve (702), a locking plate (703), a UPVC pipe (704), a grouting pipe (705), a first valve (706), and a second valve (707). The anchor rod (701) is axially equidistantly installed on the periphery of the first borehole (1) and the second borehole (2). The locking sleeve (702) is inserted into the first borehole (1) and the second borehole (2). The locking plate (703) is fixed to the end of the locking sleeve (702) through the anchor rod (701). The UPVC pipe (704) and the grouting pipe (705) are both fixedly inserted on the locking plate (703). The first valve (706) and the second valve (707) are respectively installed on one end of the UPVC pipe (704) and one end of the grouting pipe (705).

8. The drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 7 is characterized by: One end of the grouting pipe (705) extends one meter into the borehole, the electrical measurement line (5) is fixedly installed on the outside of the UPVC pipe (704), and the outer diameter of the locking sleeve (702) matches the inner diameter of the borehole.

9. The drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 1 is characterized by: The electrical survey line (5) is inserted into the borehole using a UPVC pipe and coupled by grouting. An extension line socket is left at the borehole mouth. A microseismic sensor interface is set at one end of the extension line. The microseismic sensor interface is connected to the borehole mouth extension line 40m away from the socket to transmit data to the first monitoring station (3). The first monitoring station (3) is first arranged between borehole H3-2 and borehole H4-2. The survey line arrangement of borehole H5-5 and borehole H4-2 is consistent with the survey line arrangement of borehole H6-1. The length of different borehole extension lines can be adjusted according to the length of the tunnel.

10. A drilling installation method for microseismic electrical coupling water inrush early warning monitoring according to claim 9, characterized in that: The extension line is hung on the side of the tunnel and is suspended and protected strictly in accordance with the requirements of the mine, and the connection interface is connected using the corresponding explosion-proof junction box.

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