Cooperative treatment method for multi-element disasters in coal mine roadway tunneling period

Abstract

The invention discloses a multi-element disaster cooperative treatment method during coal mine roadway tunneling, which specifically comprises the following steps: drilling holes at a roadway coal seam along the tunneling direction to form a first drill hole, performing retrogressive staged fracturing in the first drill hole, and respectively drilling holes in roadway sides on two sides of a roadway to form a second drill hole; respectively drilling the final hole position of each drill hole to the position corresponding to the final hole position of the first drill hole along the direction parallel to the roadway to form a second drill hole and a third drill hole, respectively carrying out transient electromagnetic detection on the second drill hole and the third drill hole, respectively carrying out retreat type staged fracturing after the transient electromagnetic detection is completed, installing a gas extraction system on one roadway side of the roadway, and installing a gas extraction system on the other roadway side of the roadway. The second drill hole and the third drill hole are connected into a gas extraction system for gas extraction; cooperative treatment of multi-element disasters in the roadway can be achieved, the effect that each hole has multiple purposes is achieved, the repeated construction and disaster treatment time is shortened, and the roadway tunneling speed is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine disaster management methods, and relates to a method for collaborative management of multiple disasters during coal mine tunnel excavation. Background Art

[0002] For mines with high gas content, rock burst pressure, and complex hydrology, a large number of disaster management projects need to be carried out before and during tunnel excavation, such as construction of pressure relief drilling holes, gas pre-extraction holes, and advance exploration and drainage holes. Most of these projects are construction drilling holes, which are highly repetitive and involve a large amount of work. For mines with severe disasters, the construction of the above-mentioned projects not only leads to high disaster management costs, but also leads to long construction time for disaster management projects, which squeezes excavation time and causes a reduction in tunnel excavation speed. Summary of the invention

[0003] The purpose of the present invention is to provide a method for collaboratively managing multiple disasters during coal mine tunnel excavation, which solves the problems of large construction repetitiveness and long construction time in the collaborative management of multiple disasters during coal mine tunnel excavation in the prior art.

[0004] The technical solution adopted by the present invention is a method for collaboratively managing multiple disasters during coal mine tunneling, which specifically includes the following steps: Step 1: constructing a borehole in the coal seam of the roadway along the excavation direction to form a first borehole; Step 2: Performing backward staged fracturing in the first borehole; Step 3: drilling holes on the sides of the tunnel respectively, and drilling at the end hole position of each drill hole in a direction parallel to the tunnel to the relative position of the end hole position of the first drill hole, to form a second drill hole and a third drill hole; Step 4: Perform transient electromagnetic detection on the second borehole and the third borehole respectively, and after completion, perform backward staged fracturing respectively; Step 5: Install a gas extraction system on one of the tunnel walls, and connect the second borehole and the third borehole to the gas extraction system for gas extraction.

[0005] The present invention is also characterized in that In step 1, the first borehole is 600m-800m deep.

[0006] In step 2, the first borehole is divided into sections of 15 m to 25 m each, and a fracturing pump set is used for fracturing, and the fracturing time of each section is not less than 1 hour.

[0007] Step 3 specifically includes the following steps: Step 3.1, use a drilling rig to drill holes 10m-30m on both sides of the tunnel wall at a distance of 40m-60m from the tunnel coal seam in the opposite direction of the excavation direction; Step 3.2, constructing a drilling site at the final hole position of each borehole, and arranging a drilling rig and a fracturing pump group in each drilling site; Step 3.3, using a drilling machine to drill in a direction parallel to the tunnel to a position relative to the final hole position of the first borehole, to form a second borehole.

[0008] In step 4, the second borehole and the third borehole are divided into sections of 15m-25m each, and a fracturing pump set is used for fracturing, and the fracturing time of each section is not less than 1 hour.

[0009] The transient electromagnetic detection work in step 4 is: use transient electromagnetic detection equipment to detect the resistivity of water-rich abnormal areas and water-conducting structures in a radial range of 30m along the hole depth direction. If the resistivity of the rock formation changes in an orderly manner, and the contour lines on the apparent resistivity section diagram change steadily and are distributed in layers, then the formation is not affected by the water-rich area and water-conducting structures; if the resistivity value decreases, and the contour line distribution appears to be distorted, deformed, or densely packed, then there is a low-resistance water-rich area or a water-conducting structure. After the fracturing is completed in step 4, transient electromagnetic detection is performed again on the boreholes with low-resistance water-rich areas or water-conducting structures, and the microseismic monitoring system, geosound monitoring system, and coal body stress monitoring system are used to conduct a comprehensive evaluation of the fracturing effect. If the fracturing effect does not meet the evaluation requirements, the borehole is again subjected to backward staged fracturing, transient electromagnetic detection, and comprehensive evaluation, and the operation is repeated until the fracturing effect meets the evaluation requirements.

[0010] The beneficial effects of the present invention are: The present invention realizes the coordinated control of rock burst, gas and water hazards through fracturing and transient electromagnetic detection, achieves the effect of "multiple uses per hole", and reduces repeated construction; transient electromagnetic detection can quickly obtain the resistivity, electromagnetic conductivity, water content, and lithology information of underground media within a certain depth range, and determine the spatial distribution and characteristics of water, coal rock, underground structure, etc., which is convenient for finding ore bodies and eliminating blind spots and illusions in coal resource exploration; the use of drilling rigs for long-distance drilling reduces the amount of anti-burst pressure relief engineering and water exploration and release operations, reduces the time for disaster control, and improves the excavation speed of tunnels; fracturing and transient electromagnetic detection in drilling holes improve the permeability of coal seams and increase the amount of gas extraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a drilling arrangement diagram of the method for coordinating multiple disasters during coal mine tunnel excavation according to the present invention.

[0012] In the figure, 1. first borehole, 2. second borehole, 3. third borehole, 4. tunnel. DETAILED DESCRIPTION

[0013] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] Coordinated management method for multiple disasters during coal mine tunneling, refer to Figure 1 , specifically including the following steps: Step 1: Drill a hole in the coal seam of tunnel 4 along the excavation direction to form a first borehole 1 with a depth of 600m-800m; Step 2: Divide the first borehole 1 into sections of 15m-25m each, and use a fracturing pump set to perform backward staged fracturing in the first borehole 1, with the fracturing time of each section being not less than 1h; Step 3: Use a drilling rig to drill holes of 10m-30m on both sides of the roadway at a distance of 40m-60m from the coal seam of roadway 4 in the opposite direction of the excavation direction, respectively, and construct a drilling site at the end hole position of each borehole, respectively arrange a drilling rig and a fracturing pump group in each drilling site, and use the drilling rig to drill in a direction parallel to roadway 4 to a relative position of the end hole position of the first borehole, so as to form a second borehole 2; Step 4: Transient electromagnetic detection is performed on the second borehole 2 and the third borehole 3 respectively. The transient electromagnetic detection work is: use transient electromagnetic detection equipment to detect the resistivity of the water-rich abnormal area and the water-conducting structure in the radial range of 30m along the hole depth direction. If the resistivity of the rock formation changes in an orderly manner, the contour lines on the apparent resistivity section map change steadily and are distributed in layers, then the formation is not affected by the water-rich area and the water-conducting structure; if the resistivity value decreases, the contour line distribution is distorted, deformed or densely packed, then there is a low-resistance water-rich area or a water-conducting structure; after the transient electromagnetic detection is completed, the second borehole 2 is detected. The second borehole 2 and the third borehole 3 are divided into sections of 15m-25m each, and the fracturing pump group is used to perform backward staged fracturing on the second borehole 2 and the third borehole 3, and the fracturing time of each section is not less than 1h; after the fracturing is completed, the borehole with low-resistance water-rich areas or water-conducting structures is subjected to transient electromagnetic detection again, and the microseismic monitoring system, geoacoustic monitoring system, and coal body stress monitoring system are used to conduct a comprehensive evaluation of the fracturing effect. If the fracturing effect does not meet the evaluation requirements, the borehole is subjected to backward staged fracturing, transient electromagnetic detection, and comprehensive evaluation again, and the operation is repeated until the fracturing effect meets the evaluation requirements; Step 5: Install a gas extraction system on one of the sides of the tunnel 4, and connect the second borehole 2 and the third borehole 3 to the gas extraction system for gas extraction.

[0015] The working principle of the present invention is: By drilling and fracturing at the coal seam of tunnel 4, artificial fracturing cracks are generated or natural cracks are restarted to form a fracture network system. By destroying the integrity of the rock, it can collapse in time, thereby achieving the purpose of pressure relief and management; transient electromagnetic detection transmits electromagnetic waves through a coil to the underground, and then causes eddy currents and induced electric fields inside the ore body. The receiving coil is used to collect the phenomenon of underground electric field or magnetic field changes, so as to study the layer position, spatial distribution, morphology and physical parameters of various underground substances. The transient electromagnetic method can quickly obtain the physical parameter information of underground medium resistivity, electromagnetic conductivity, water content and lithology within a certain depth range through a non-contact measurement method, and determine the spatial distribution and characteristics of water, coal rock and underground structure, which is convenient for finding ore bodies and eliminating blind spots and illusions in coal resource exploration. By performing transient electromagnetic detection and fracturing work on the sides of tunnel 4, water pressure is released, thereby reducing the influence of water-rich areas and water-conducting structures on the stratum, and improving the permeability of the coal seam, increasing the gas extraction volume; gas prevention and control is achieved through the gas extraction system.

[0016] Embodiment 1: The method for coordinated management of multiple disasters during coal mine tunneling specifically includes the following steps: Step 1: Drill a hole in the coal seam of tunnel 4 along the excavation direction to form a first borehole 1 with a depth of 600m; Step 2: Divide the first borehole 1 into sections of 15 m each, and use a fracturing pump set to perform backward staged fracturing in the first borehole 1, with the fracturing time of each section being 1 hour; Step 3: Use a drilling rig to drill holes of 10 m on both sides of the roadway at a distance of 40 m from the coal seam of roadway 4 in the opposite direction of the excavation direction, construct a drilling site at the end hole position of each borehole, arrange a drilling rig and a fracturing pump group in each drilling site, and use the drilling rig to drill in a direction parallel to roadway 4 to the relative position of the end hole position of the first borehole to form a second borehole 2; Step 4: Transient electromagnetic detection is performed on the second borehole 2 and the third borehole 3 respectively. The transient electromagnetic detection work is: use transient electromagnetic detection equipment to detect the resistivity of the water-rich abnormal area and the water-conducting structure in the radial range of 30m along the hole depth direction. If the resistivity of the rock formation changes in an orderly manner, the contour lines on the apparent resistivity cross-section diagram change steadily and are distributed in layers, then the formation is not affected by the water-rich area and the water-conducting structure; if the resistivity value decreases, the contour line distribution is distorted, deformed or densely packed, then there is a low-resistance water-rich area or a water-conducting structure; after the transient electromagnetic detection is completed, the second Borehole 2 and the third borehole 3 are divided into sections of 15 m each. The second borehole 2 and the third borehole 3 are respectively subjected to backward staged fracturing using a fracturing pump set, and the fracturing time for each section is 1 hour. After the fracturing is completed, transient electromagnetic detection is performed again on the boreholes with low-resistance water-rich areas or water-conducting structures, and the fracturing effect is comprehensively evaluated using a microseismic monitoring system, a geoacoustic monitoring system, and a coal body stress monitoring system. If the fracturing effect does not meet the evaluation requirements, the borehole is subjected to backward staged fracturing, transient electromagnetic detection, and comprehensive evaluation again, and the operation is repeated until the fracturing effect meets the evaluation requirements. Step 5: Install a gas extraction system on one of the sides of the tunnel 4, and connect the second borehole 2 and the third borehole 3 to the gas extraction system for gas extraction.

[0017] Embodiment 2: The method for coordinated management of multiple disasters during coal mine tunneling specifically includes the following steps: Step 1: Drill holes along the excavation direction at the coal seam of tunnel 4 to form a first borehole 1 with a depth of 700m; Step 2: Divide the first borehole 1 into sections of 20 m each, and use a fracturing pump set to perform backward staged fracturing in the first borehole 1, with the fracturing time of each section being 1.5 h; Step 3: Use a drilling rig to drill holes 20 meters long on both sides of the roadway at a distance of 50 meters from the coal seam of roadway 4 in the opposite direction of the excavation direction, construct a drilling site at the end hole position of each borehole, arrange a drilling rig and a fracturing pump group in each drilling site, and use the drilling rig to drill in a direction parallel to roadway 4 to the relative position of the end hole position of the first borehole to form a second borehole 2; Step 4: Perform transient electromagnetic detection on the second borehole 2 and the third borehole 3 respectively. The transient electromagnetic detection work is: use transient electromagnetic detection equipment to detect the resistivity of the water-rich abnormal area and the water-conducting structure in the radial range of 30m along the hole depth direction. If the resistivity of the rock formation changes in an orderly manner, the contour lines on the apparent resistivity section map change steadily and are distributed in layers, then the formation is not affected by the water-rich area and the water-conducting structure; if the resistivity value decreases, the contour line distribution is distorted, deformed or densely packed, then there is a low-resistance water-rich area or a water-conducting structure; after the transient electromagnetic detection is completed, the second borehole 2 and the third borehole 3 are detected. The borehole 2 and the third borehole 3 are divided into sections of 20 m each. The second borehole 2 and the third borehole 3 are respectively subjected to backward staged fracturing using a fracturing pump set, and the fracturing time for each section is 1.5 h. After the fracturing is completed, transient electromagnetic detection is performed again on the boreholes with low-resistance water-rich areas or water-conducting structures, and the microseismic monitoring system, geoacoustic monitoring system, and coal body stress monitoring system are used to conduct a comprehensive evaluation of the fracturing effect. If the fracturing effect does not meet the evaluation requirements, the borehole is subjected to backward staged fracturing, transient electromagnetic detection, and comprehensive evaluation again, and the operation is repeated until the fracturing effect meets the evaluation requirements. Step 5: Install a gas extraction system on one of the sides of the tunnel 4, and connect the second borehole 2 and the third borehole 3 to the gas extraction system for gas extraction.

[0018] Embodiment 3: Step 1: Drill a hole in the coal seam of tunnel 4 along the excavation direction to form a first borehole 1 with a depth of 800m; Step 2: Divide the first borehole 1 into sections of 25 m each, and use a fracturing pump set to perform backward staged fracturing in the first borehole 1, with the fracturing time of each section being 2 h; Step 3: Use a drilling rig to drill holes 30 meters long on both sides of the roadway at a distance of 60 meters from the coal seam of roadway 4 in the opposite direction of the excavation direction, construct a drilling site at the end hole position of each borehole, arrange a drilling rig and a fracturing pump group in each drilling site, and use the drilling rig to drill in a direction parallel to roadway 4 to the relative position of the end hole position of the first borehole to form a second borehole 2; Step 4: Transient electromagnetic detection is performed on the second borehole 2 and the third borehole 3 respectively. The transient electromagnetic detection work is: use transient electromagnetic detection equipment to detect the resistivity of the water-rich abnormal area and the water-conducting structure in the radial range of 30m along the hole depth direction. If the resistivity of the rock formation changes in an orderly manner, the contour lines on the apparent resistivity cross-section diagram change steadily and are distributed in layers, then the formation is not affected by the water-rich area and the water-conducting structure; if the resistivity value decreases, the contour line distribution is distorted, deformed or densely packed, then there is a low-resistance water-rich area or a water-conducting structure; after the transient electromagnetic detection is completed, the second Borehole 2 and the third borehole 3 are divided into sections of 25 m each. The second borehole 2 and the third borehole 3 are respectively subjected to backward staged fracturing using a fracturing pump set, and the fracturing time for each section is 2 h. After the fracturing is completed, transient electromagnetic detection is performed again on the boreholes with low-resistance water-rich areas or water-conducting structures, and the fracturing effect is comprehensively evaluated using a microseismic monitoring system, a geoacoustic monitoring system, and a coal body stress monitoring system. If the fracturing effect does not meet the evaluation requirements, the borehole is subjected to backward staged fracturing, transient electromagnetic detection, and comprehensive evaluation again, and the operation is repeated until the fracturing effect meets the evaluation requirements. Step 5: Install a gas extraction system on one of the sides of the tunnel 4, and connect the second borehole 2 and the third borehole 3 to the gas extraction system for gas extraction.

Claims

1. A method for coordinating and managing multiple disasters during coal mine tunneling, characterized in that: The specific steps include: Step 1: drilling a hole in the coal seam of the tunnel (4) along the excavation direction to form a first borehole (1); Step 2: Performing backward staged fracturing in the first borehole (1); Step 3: drilling holes on the sides of the tunnel (4), and drilling at the end hole position of each drill hole in a direction parallel to the tunnel (4) to a position relative to the end hole position of the first drill hole (1), thereby forming a second drill hole (2) and a third drill hole (3); Step 4: Perform transient electromagnetic detection on the second borehole (2) and the third borehole (3), and after completion, perform backward staged fracturing on each of them; Step 5: Install a gas extraction system on one of the sidewalls of the tunnel (4), and connect the second borehole (2) and the third borehole (3) to the gas extraction system for gas extraction.

2. The method for coordinated management of multiple disasters during coal mine tunneling according to claim 1, characterized in that: In step 1, the first borehole (1) has a depth of 600m-800m.

3. The method for coordinated management of multiple disasters during coal mine tunneling according to claim 1, characterized in that: In step 2, the first borehole (1) is divided into sections of 15 m to 25 m each, and a fracturing pump set is used for fracturing, with the fracturing time of each section being not less than 1 hour.

4. The method for coordinated management of multiple disasters during coal mine tunneling according to claim 1, characterized in that: The step 3 specifically comprises the following steps: Step 3.1, using a drilling machine to drill holes 10m to 30m on both sides of the roadway at a distance of 40m to 60m from the coal seam of roadway (4) in the opposite direction of the excavation direction; Step 3.2, constructing a drilling site at the final hole position of each borehole, and arranging a drilling rig and a fracturing pump group in each drilling site; Step 3.3, using a drilling machine to drill in a direction parallel to the tunnel (4) to a position relative to the final hole position of the first borehole (1), thereby forming a second borehole (2).

5. The method for coordinated management of multiple disasters during coal mine tunneling according to claim 1, characterized in that: In step 4, the second borehole (2) and the third borehole (3) are divided into sections of 15 m to 25 m each, and are fractured using a fracturing pump set, with the fracturing time for each section being no less than 1 hour.

6. The method for coordinated management of multiple disasters during coal mine tunneling according to claim 1, characterized in that: The transient electromagnetic detection work in step 4 is: use transient electromagnetic detection equipment to perform resistivity detection of abnormal water-rich areas and water-conducting structures in a radial range of 30m along the hole depth direction. If the resistivity of the rock formation changes in an orderly manner, the contour lines on the apparent resistivity section diagram change steadily and are distributed in layers, then the formation is not affected by the water-rich area and the water-conducting structure; if the resistivity value decreases, the contour line distribution appears to be distorted, deformed or densely striped, then there is a low-resistance water-rich area or a water-conducting structure.

7. The method for coordinated management of multiple disasters during coal mine tunneling according to claim 6, characterized in that: After the fracturing in step 4 is completed, transient electromagnetic detection is performed again on the boreholes with low-resistance water-rich areas or water-conducting structures, and the fracturing effect is comprehensively evaluated using a microseismic monitoring system, a geoacoustic monitoring system, and a coal body stress monitoring system. If the fracturing effect does not meet the evaluation requirements, the borehole is again subjected to backward staged fracturing, transient electromagnetic detection, and comprehensive evaluation, and the operation is repeated until the fracturing effect meets the evaluation requirements.

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