Gas and impact disaster treatment method based on comb-shaped drilling hydraulic fracturing and ventilation

Abstract

The present application belongs to the field of deep coal seam mining and disaster prevention and treatment, and particularly relates to a gas and impact disaster treatment method based on comb-shaped drilling hydraulic fracturing and ventilation. The present application constructs a track uphole and a transportation uphole along the inclination on one side of the mining area trend, constructs a return air uphole on the other side of the mining area trend, and realizes Y-shaped ventilation during working face mining by gob-side entry retaining. Before working face roadway excavation, comb-shaped drilling is constructed from the return air uphole to uniformly perform hydraulic fracturing pressure relief and gas pre-drainage on the coal seam at the working face roadway position. During working face roadway excavation, ventilation is performed from the excavated part to the excavation face, and the exhaust air is discharged to the return air uphole through the comb-shaped drilling and the hydraulic fracturing fracture network, thereby improving the gas disaster prevention and treatment level during working face roadway excavation. During working face mining, on the basis of Y-shaped ventilation, the comb-shaped drilling (and auxiliary drilling) is also utilized to make up for the limitation of Y-shaped ventilation on gas removal in the goaf, thereby solving the problem of blind area in gas removal in the goaf.

Description

Technical Field

[0001] This invention belongs to the field of deep coal seam mining and disaster prevention, specifically involving a method for handling gas and shock disasters based on comb-shaped borehole hydraulic fracturing and ventilation. Background Technology

[0002] Gas and rock bursts are common hazards in coal mining. Gas adsorbed in the coal seam is released during mining as the seam breaks up, potentially leading to gas poisoning and explosions. Rock bursts are the sudden release of energy accumulated in a coal seam under high ground pressure, posing a threat to life and property. Therefore, preventing gas and rock burst hazards is crucial for safe coal mining, especially in high-pressure environments of deeply buried coal seams.

[0003] Coal in the coal face is mined gradually according to the production plan. Theoretically, there is sufficient time for pre-treatment of gas and rockburst hazards. The real constraint on the overall coal mine production efficiency lies in the excavation of roadways from the coal face. Affected by gas and rockburst hazards, roadway excavation is slow, especially in deep, high-pressure environments where the coal's impact tendency and energy increase significantly; the coal's density also increases, leading to greater difficulty in gas desorption; coupled hazards of coal and gas outbursts are highly likely to occur during roadway excavation. Not only does the erupted coal cause impact damage, but the released gas also poses poisoning and explosion hazards. While traditional hydraulic fracturing can depressurize and pre-treat the coal seam in the roadway, it is prone to uneven depressurization and insufficient gas pre-treatment. Furthermore, pre-extraction of gas cannot completely remove gas from the coal seam; a large amount of gas will still be released during roadway excavation. Therefore, it is still necessary to improve gas hazard prevention during roadway excavation.

[0004] As mentioned earlier, pre-drainage cannot completely remove gas from the coal seam. During mining, gas is released from the coal seam within the working face. This gas is mainly concentrated in the mining area, thus requiring high-quality ventilation. Furthermore, residual coal in the goaf also releases gas, and some of the gas released from the coal seam during mining also enters the goaf, posing a gas safety hazard.

[0005] Therefore, improving the effects of hydraulic fracturing and gas pretreatment during working face roadway excavation, enhancing the level of gas disaster prevention and control during working face roadway excavation, improving the quality of gas ventilation during coal mining, and resolving gas safety hazards in goaf areas have become key aspects of high-quality coal seam mining. Summary of the Invention

[0006] To address the shortcomings of the existing technologies, this invention proposes a method for handling gas and shock hazards based on comb-shaped borehole hydraulic fracturing and ventilation, specifically including the following steps: S1: Constructing a track incline and a transport incline on one side of the mining area's strike; constructing a return air incline on the other side of the mining area's strike; sequentially arranging several working faces advancing along the strike along the dip direction; S2: First working face excavation and ventilation: Constructing comb-shaped boreholes from the return air incline towards the designed locations of the track roadway and transport roadway, respectively; performing hydraulic fracturing and gas pre-drainage on the coal seams at the locations of the track roadway and transport roadway based on the comb-shaped boreholes; excavating the track roadway from the track incline to the cut-out point in the coal seam, and from the transport incline... In the coal seam, the haulage roadway is excavated sequentially to the cut-in and return air incline. The air entering the excavation face is discharged to the return air incline through the comb-shaped borehole and its hydraulic fracturing network; the cut-in is opened; S3: First working face mining and ventilation: mining and leaving a roadway along the goaf in the haulage roadway; Y-shaped ventilation is used during mining; S4: Second working face excavation and ventilation: connecting the roadway along the goaf in the first working face with the track incline to form the track roadway for the second working face; construct the haulage roadway and open the cut-in according to step S2; S5: mining and ventilation of the second working face according to step S3; S6: excavation and mining of subsequent working faces in the mining area are carried out sequentially according to steps S4-S5.

[0007] Preferably, in step S1, the track uphill is connected to the auxiliary haulage roadway, the haulage uphill is connected to the haulage roadway, the return air uphill is connected to the return air roadway, and the return air uphill is constructed in the bottom stratum.

[0008] Preferably, in step S2, the main borehole of the comb-shaped borehole is parallel to the track roadway and the transport roadway, and is located in the bottom rock strata of the track roadway and the transport roadway. The branch boreholes of the comb-shaped borehole are located in the coal seam where the track roadway and the transport roadway are located, and extend along the axis of the track roadway and the transport roadway. The inclined section connects the main borehole and the branch borehole.

[0009] Preferably, in step S2, during the excavation of the track tunnel, fresh air is introduced from the track incline, flows into the track tunnel, and becomes exhaust air after reaching the excavation face. The exhaust air is discharged through the comb-shaped borehole and its hydraulic fracturing network to the return air incline. During the excavation of the transport tunnel, fresh air is introduced from the transport incline, flows into the transport tunnel, and becomes exhaust air after reaching the excavation face. The exhaust air is discharged through the comb-shaped borehole and its hydraulic fracturing network to the return air incline.

[0010] Preferably, in step S2, a hydraulic fracturing borehole is constructed at the designed cut-in position from the track roadway to the transport roadway. Based on the hydraulic fracturing borehole, the coal seam at the cut-in position is hydraulically fracturing and the gas is pre-extracted. Then, the cut-in is excavated from the track roadway to the transport roadway.

[0011] Preferably, in step S2, during the cutting-eye excavation process, fresh air is introduced from the track uphill section. The fresh air flows into the track tunnel and becomes exhaust air after reaching the excavation face of the cutting eye. The exhaust air is discharged through the transport tunnel to the return air uphill section.

[0012] Preferably, in step S3, fresh air is introduced into the transport roadway from the transport uphill section, and fresh air is introduced into the track roadway from the track uphill section; after the fresh air reaches the mining area, it becomes exhaust air; the exhaust air is discharged through the goaf roadway to the return air uphill section.

[0013] Preferably, in step S3, during the maintenance shift, a 2-4 hour period is selected to temporarily block the goaf roadway, allowing the exhaust air in the mining area to be discharged through the comb-shaped boreholes on the side of the track roadway to the return air uphill.

[0014] Preferably, in step S3, an auxiliary borehole is drilled from the return air incline towards the first working face, and the auxiliary borehole is drilled in the middle of the dip width direction of the first working face; during the maintenance shift, one hour is selected to temporarily block the goaf roadway so that the exhaust air in the mining area is discharged through the auxiliary borehole to the return air incline.

[0015] Preferably, in step S4, a sealing wall is constructed in the track roadway of the first working face, near the transport uphill or stop line.

[0016] Preferably, in step S4, the goaf roadway of the first working face is disconnected from the return air uphill by a construction sealing wall, and then disconnected from the transport uphill by filling with filling material.

[0017] The invention's key features and beneficial technical effects are as follows: This invention involves constructing an uphill roadway and transport roadway along the dip direction on one side of the mining area's strike, and constructing a return air uphill roadway on the other side of the strike. This achieves Y-shaped ventilation during working face mining by using goaf-side roadway retention. Before working face roadway excavation, comb-shaped boreholes are drilled from the return air uphill roadway to uniformly hydraulically fracture and depressurize the coal seam at the working face roadway location, and pre-extract gas. During working face roadway excavation, ventilation is provided to the excavated portion, while exhaust air is discharged through the comb-shaped boreholes and their hydraulic fracturing network to the return air uphill roadway, improving the level of gas disaster prevention during working face roadway excavation. During working face mining, in addition to Y-shaped ventilation, comb-shaped boreholes (and auxiliary boreholes) are used to compensate for the limitations of Y-shaped ventilation in goaf gas removal, solving the problem of blind spots in goaf gas removal. This invention improves the hydraulic fracturing and depressurization effect and gas pretreatment effect during working face roadway excavation, enhances the gas disaster prevention and control level during working face roadway excavation, improves the gas ventilation quality during coal mining, and solves the gas safety hazards in goaf areas. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the working face layout within the mining area in the gas and shock hazard treatment method of the present invention.

[0019] Figure 2 This is a schematic diagram of the tunneling of the first working face in the gas and shock disaster treatment method of the present invention.

[0020] Figure 3This is a schematic diagram of the first working face mining in the gas and shock disaster treatment method of the present invention.

[0021] Figure 4 This is a schematic diagram of the comb-shaped drilling construction of the second working face in the gas and shock disaster treatment method of the present invention.

[0022] Figure 5 This is a schematic diagram of the tunneling of the second working face in the gas and shock disaster treatment method of the present invention.

[0023] Figure 6 This is a schematic diagram of the second working face mining in the gas and shock disaster treatment method of the present invention.

[0024] In the diagram: 11-Track uphill; 12-Transport uphill; 13-Return air uphill; 14-Stop mining line; 15-Sealing wall; 21-Track roadway; 22-Transport roadway; 23-Cut-out; 24-Mining area; 25-Goaf; 26-Goaf roadway; 31-Main borehole; 32-Inclined section; 33-Branch borehole; 34-Auxiliary borehole. Detailed Implementation

[0025] The specific embodiments of the present invention will now be described in conjunction with the accompanying drawings.

[0026] like Figures 1-6 As shown, the present invention proposes a method for handling gas and shock disasters based on comb-shaped borehole hydraulic fracturing and ventilation, which includes the following steps.

[0027] S1: As Figure 1 As shown, on one side of the mining area strike, a track incline 11 and a transport incline 12 are constructed along the dip direction. The track incline 11 is connected to the auxiliary transport roadway, and the transport incline 12 is connected to the transport roadway. On the other side of the mining area strike, a return air incline 13 is constructed along the dip direction. The return air incline 13 is connected to the return air roadway, and the return air incline 13 is preferably constructed in the bottom strata. Several working faces advancing along the strike are arranged sequentially along the dip direction.

[0028] The diagram in this embodiment shows three working faces, namely the first working face, the second working face, and the third working face; the width of each working face is 210m, and the advancing length of each working face is 1050m.

[0029] In this invention, dip refers to the dip direction of the coal seam, and strike refers to the strike direction of the coal seam; in the diagram, strike is the left-right direction, and dip is the front-back direction; dip and strike are professional geological terms that express the direction of strata, and will not be elaborated further here.

[0030] S2: As Figures 1-2As shown, the first working face excavation and ventilation: From the return air incline 13, comb-shaped boreholes are constructed towards the designed positions of track roadway 21 and transport roadway 22. The main borehole 31 of the comb-shaped boreholes is parallel to track roadway 21 and transport roadway 22, and located in the bottom strata of track roadway 21 and transport roadway 22. The branch boreholes 33 of the comb-shaped boreholes are located in the coal seam at the locations of track roadway 21 and transport roadway 22, and extend along the axis of track roadway 21 and transport roadway 22. The inclined section 32 connects the main borehole 31 and the branch borehole 33. The diameter of the bare borehole of the comb-shaped boreholes is 96mm, 113mm, or 120mm, and the inclination angle between the inclined section 32 and the main borehole 31 is 15°. -25°, the inclination angle between branch hole 33 and inclination section 32 is 13-22°, the length of a single branch hole 33 is 60-100m, and the spacing between adjacent inclination sections 32 on the main borehole 31 is 60-100m; comb-shaped boreholes are a well-known technology in the field and will not be described in detail here; hydraulic fracturing and depressurization are carried out on the coal seams at the locations of track roadway 21 and transport roadway 22 based on comb-shaped boreholes, specifically based on the branch holes 33 of the comb-shaped boreholes to carry out hydraulic fracturing and depressurization on the coal seams at the locations of track roadway 21 and transport roadway 22, the hydraulic fracturing pressure is 20-30MPa, and the gas in the coal seams at the locations of track roadway 21 and transport roadway 22 is pre-extracted. Then, from the track incline 11, the track roadway 21 is excavated along the strike in the coal seam to the cut-in position 23. During the excavation, fresh air is introduced from the track incline 11, flows into the track roadway 21, and becomes exhaust air after reaching the excavation face. The exhaust air is discharged through the comb-shaped borehole and its hydraulic fracturing network to the return air incline 13. From the transport incline 12, the transport roadway 22 is excavated along the strike in the coal seam to the cut-in position 23, and then the excavation continues from the cut-in position 23 to the return air incline 13 and connects with it. During the excavation, fresh air is introduced from the transport incline 12, flows into the transport roadway 22, and becomes exhaust air after reaching the excavation face. The exhaust air is discharged through the comb-shaped borehole and its hydraulic fracturing network to the return air incline 13. Finally, a hydraulic fracturing borehole is constructed at the designed location of cut-in 23 from track roadway 21 to transport roadway 22. Based on the hydraulic fracturing borehole, hydraulic fracturing is performed on the coal seam at the location of cut-in 23 to relieve pressure. The hydraulic fracturing pressure is 20-30 MPa, and gas is pre-extracted. Then, cut-in 23 is excavated from track roadway 21 to transport roadway 22. During the excavation, fresh air is introduced from track incline 11. The fresh air flows into track roadway 21 and becomes exhaust air after reaching the excavation face of cut-in 23. The exhaust air is discharged through transport roadway 22 to return air incline 13.

[0031] S3: As Figure 3As shown, the first working face mining and ventilation: Mining begins from the cut-off point 23 towards the stop line 14, and a gob-side roadway 26 is formed by leaving a roadway along the gob in the transport roadway 22; Y-shaped ventilation is used during the mining process to improve the quality of gas ventilation during coal mining. Specifically: fresh air is introduced into the transport roadway 22 from the transport incline 12, and fresh air is introduced into the track roadway 21 from the track incline 11; the fresh air becomes exhaust air after reaching the stope 24; the exhaust air is discharged through the gob-side roadway 26 to the return air incline 13; at this time, the airflow of the Y-shaped ventilation will flow through the gob area 25, which has a clearing effect on the gas in the gob area 25, but the airflow of the Y-shaped ventilation will not cover the entire gob area 25, and its coverage range is shown in the figure. Figure 3 The area defined by the red circle is as follows: During the maintenance shift, a 2-4 hour period is selected for temporary sealing of the goaf roadway 26 using airbags, air doors, or air curtains. This allows the exhaust air in the mining area 24 to be discharged through the comb-shaped boreholes on the side of the track roadway 21 to the return air incline 13. The area of ​​the goaf 25 covered by this ventilation is shown in the image. Figure 3 The blue circle defines the range, compensating for the limitations of Y-shaped ventilation in removing gas within 25 minutes of the goaf.

[0032] Furthermore, auxiliary borehole 34 is constructed from the return air incline 13 towards the first working face. The auxiliary borehole 34 is constructed in the middle of the dip width direction of the first working face. During a one-hour shift in the maintenance work, airbags, air doors, or air curtains are used to temporarily seal the goaf roadway 26, allowing the exhaust air in the stope 24 to be discharged through the auxiliary borehole 34 to the return air incline 13, thus resolving the problem of blind spots in gas removal within the goaf area 25. Ventilation from the comb-shaped boreholes on the side of the track roadway 21 and the auxiliary borehole 34 can be carried out simultaneously.

[0033] S4: As Figures 4-5As shown, the second working face excavation and ventilation: In the track roadway 21 of the first working face, a sealing wall 15 is constructed near the transport uphill 12 or the stop line 14; the goaf roadway 26 of the first working face is connected to the track uphill 11, disconnected from the return air uphill 13 (constructing the sealing wall 15), and disconnected from the transport uphill 12 (filled with filling material) to serve as the track roadway 21 of the second working face. A comb-shaped borehole is constructed from the return air incline 13 towards the designed location of transport roadway 22. The main borehole 31 of the comb-shaped borehole is parallel to transport roadway 22 and located in the bottom strata of transport roadway 22. The branch borehole 33 of the comb-shaped borehole is located in the coal seam at the location of transport roadway 22 and extends along the axis of transport roadway 22. The directional drilling section 32 connects the main borehole 31 and the branch borehole 33. The diameter of the bare borehole of the comb-shaped borehole is 96mm, 113mm, or 120mm. The directional drilling angle between the directional drilling section 32 and the main borehole 31 is 15-25°. The branch borehole 33 is connected to the directional drilling section... The inclination angle between the two sections 32 is 13-22°, the length of a single branch hole 33 is 60-100m, and the spacing between adjacent inclination sections 32 on the main borehole 31 is 60-100m. The comb-shaped borehole is a well-known technology in the field and will not be described in detail here. Hydraulic fracturing and depressurization are performed on the coal seam at the location of transport roadway 22 based on the comb-shaped borehole. Specifically, hydraulic fracturing and depressurization are performed on the coal seam at the location of transport roadway 22 based on the branch holes 33 of the comb-shaped borehole. The hydraulic fracturing pressure is 20-30MPa, and the gas in the coal seam at the location of transport roadway 22 is pre-extracted. Then, from the transport incline 12, the transport roadway 22 is excavated along the strike in the coal seam to the cut-in 23, and then the excavation continues from the cut-in 23 to the return air incline 13 and connects with the return air incline 13; during the excavation process, fresh air is introduced from the transport incline 12, the fresh air flows into the transport roadway 22, and becomes exhaust air after reaching the excavation face. The exhaust air is discharged to the return air incline 13 through the comb-shaped borehole and its hydraulic fracturing fracture network. Finally, a hydraulic fracturing borehole is constructed at the designed location of cut-in 23 from track roadway 21 to transport roadway 22. Based on the hydraulic fracturing borehole, hydraulic fracturing is performed on the coal seam at the location of cut-in 23 to relieve pressure. The hydraulic fracturing pressure is 20-30 MPa, and gas is pre-extracted. Then, cut-in 23 is excavated from track roadway 21 to transport roadway 22. During the excavation, fresh air is introduced from track incline 11. The fresh air flows into track roadway 21 and becomes exhaust air after reaching the excavation face of cut-in 23. The exhaust air is discharged through transport roadway 22 to return air incline 13.

[0034] S5: As Figure 6As shown, referring to step S3, the second working face is mined and ventilated. Specifically: mining begins from the cut-off point 23 towards the stop line 14, and a goaf-side roadway 26 is formed by leaving a roadway along the goaf in the transport roadway 22. During the mining process, Y-shaped ventilation is used to improve the quality of gas ventilation during coal mining. Specifically: fresh air is introduced into the transport roadway 22 from the transport incline 12, and fresh air is introduced into the track roadway 21 from the track incline 11. After the fresh air reaches the stope 24, it becomes exhaust air. The exhaust air is discharged through the goaf-side roadway 26 to the return air incline 13. At this time, the airflow of the Y-shaped ventilation will flow through the goaf 25, which has a clearing effect on the gas in the goaf 25. However, the airflow of the Y-shaped ventilation will not cover the entire goaf 25. Its coverage range is shown in the figure. Figure 3 The area defined by the red circle is as follows: During the maintenance shift, a 2-4 hour period is selected for temporary sealing of the goaf roadway 26 using airbags, air doors, or air curtains. This allows the exhaust air in the mining area 24 to be discharged through the comb-shaped boreholes on the side of the track roadway 21 to the return air incline 13. The area of ​​the goaf 25 covered by this ventilation is shown in the image. Figure 3 The blue circle defines the range, compensating for the limitations of Y-shaped ventilation in removing gas within 25 minutes of the goaf.

[0035] Furthermore, auxiliary borehole 34 is constructed from the return air incline 13 towards the first working face. The auxiliary borehole 34 is constructed in the middle of the dip width direction of the first working face. During a one-hour shift in the maintenance work, airbags, air doors, or air curtains are used to temporarily seal the goaf roadway 26, allowing the exhaust air in the stope 24 to be discharged through the auxiliary borehole 34 to the return air incline 13, thus resolving the problem of blind spots in gas removal within the goaf area 25. Ventilation from the comb-shaped boreholes on the side of the track roadway 21 and the auxiliary borehole 34 can be carried out simultaneously.

[0036] S6: Refer to steps S4-S5 to excavate and mine the subsequent working faces in the mining area in sequence.

[0037] In this invention, before mining the working face, it is necessary to perform hydraulic fracturing to depressurize and pre-drain the gas in the coal in the working face. For example, hydraulic fracturing to depressurize and pre-drain the gas can be performed by drilling along the coal seam from track roadway 21 and transport roadway 22 into the working face. This is existing technology and is not the subject of this invention, so it will not be described in detail here.

[0038] This invention is not limited to the preferred embodiments described above. Anyone can derive other methods in various forms under the guidance of this invention. Any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A method for handling gas and shock hazards based on comb-shaped borehole hydraulic fracturing and ventilation, characterized in that, Includes the following steps: S1: Construct the track and transport uphill on one side of the mining area strike; construct the return air uphill on the other side of the mining area strike; arrange several working faces advancing along the strike in sequence along the dip; S2: First Working Face Excavation and Ventilation: From the return air incline, comb-shaped boreholes are constructed towards the designed locations of the track roadway and transport roadway. The main boreholes of the comb-shaped boreholes are parallel to the track roadway and transport roadway, located in the floor strata below them. The branch boreholes are located in the coal seams at the track roadway and transport roadway locations, extending along their axes, with each branch borehole being 60-100m long. Based on the comb-shaped boreholes, hydraulic fracturing and gas pre-drainage are performed on the coal seams at the track roadway and transport roadway locations. From the track incline... In the coal seam, the track roadway is excavated to the cut-in. From the haulage incline, the haulage roadway is excavated sequentially to the cut-in and return air incline. During the track roadway excavation, fresh air is introduced from the track incline. The fresh air flows into the track roadway, becomes exhaust air upon reaching the excavation face, and is discharged through comb-shaped boreholes and their hydraulic fracturing network to the return air incline. During the haulage roadway excavation, fresh air is introduced from the haulage incline. The fresh air flows into the haulage roadway, becomes exhaust air upon reaching the excavation face, and is discharged through comb-shaped boreholes and their hydraulic fracturing network to the return air incline. The cut-in is then opened. S3: First working face mining and ventilation: mining and leaving roadways along the goaf; Y-shaped ventilation is used during mining, fresh air is introduced from the haulage incline into the haulage roadway, and fresh air is introduced from the track incline into the track roadway; fresh air becomes exhaust air after reaching the mining area; exhaust air is discharged through the goaf roadway to the return air incline; during the maintenance shift, the goaf roadway is temporarily blocked for 2-4 hours, so that the exhaust air in the mining area is discharged through the comb-shaped boreholes on the side of the track roadway to the return air incline; Auxiliary drilling is carried out from the return air incline towards the first working face. The auxiliary drilling is carried out in the middle of the dip width direction of the first working face. During the maintenance shift, one hour is selected to temporarily block the goaf roadway so that the exhaust air in the mining area can be discharged through the auxiliary drilling to the return air incline. S4: Second working face excavation and ventilation: Connect the goaf roadway of the first working face with the track uphill section to form the track roadway of the second working face; refer to step S2 to construct the transport roadway and open the cut-in hole; S5: Refer to step S3 for the second working face mining and ventilation; S6: Refer to steps S4-S5 to excavate and mine the subsequent working faces in the mining area in sequence.

2. The method for handling gas and shock disasters according to claim 1, characterized in that, In step S1, the track uphill is connected to the auxiliary haulage roadway, the haulage uphill is connected to the haulage roadway, the return air uphill is connected to the return air roadway, and the return air uphill is constructed in the bottom rock stratum.

3. The method for handling gas and shock disasters according to claim 2, characterized in that, In step S2, the directional drilling section connects the main borehole and the branch hole.

4. The method for handling gas and shock hazards according to claim 3, characterized in that, In step S2, hydraulic fracturing boreholes are constructed along the bedding plane at the designed cut-in location from the track roadway to the transport roadway. Based on the hydraulic fracturing boreholes along the bedding plane, hydraulic fracturing is performed on the coal seam at the cut-in location, and gas is pre-extracted. Then, the cut-in is excavated from the track roadway to the transport roadway.

5. The method for handling gas and shock hazards according to claim 4, characterized in that, In step S2, during the cutting-eye excavation process, fresh air is introduced from the track uphill section. The fresh air flows into the track tunnel and becomes exhaust air after reaching the cutting-eye excavation face. The exhaust air is discharged through the transport tunnel to the return air uphill section.

6. The method for handling gas and shock hazards according to claim 1, characterized in that, In step S4, a sealing wall is constructed in the track roadway of the first working face, near the transport uphill or stop line; the goaf roadway of the first working face is disconnected from the return air uphill by constructing the sealing wall, and then disconnected from the transport uphill by filling with filling material.

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