A method for arranging mining tunnels based on gas control

Abstract

The present application proposes a method for arranging mining tunnels based on gas control, comprising the following processes: arranging transport tunnels and auxiliary transport tunnels on both sides of the working face, and arranging a return air tunnel parallel to the auxiliary transport tunnel on one side of the auxiliary transport tunnel, leaving a section coal pillar between the auxiliary transport tunnel and the return air tunnel, arranging a plurality of connecting tunnels connected to the auxiliary transport tunnel and the return air tunnel along the arrangement direction of the auxiliary transport tunnel on the section coal pillar, and sealing the connecting tunnel; installing a self-moving rock-blocking support on one side of the mining side of the auxiliary transport tunnel extending a certain distance behind the working face, and opening the first connecting tunnel near the tail of the auxiliary transport tunnel flush with the initial cutting eye of the working face. During the mining process, the rock-blocking support moves forward with the working face, and the wall is constructed by a staged wall retention method, and double-tunnel excavation is used to improve the excavation efficiency.

Description

Technical Field

[0001] The present application relates to the field of coal mining technology, and in particular to a method for arranging mining tunnels based on gas control. Background Art

[0002] The technology of retaining lanes along the goaf is widely used in my country, especially in high-gas mines. After achieving Y-type ventilation, the problem of gas accumulation in the upper corner can be effectively solved, and the recovery rate of coal resources can be improved at the same time, with considerable safety and economic benefits. In order to achieve Y-type ventilation, the reserved lanes along the goaf must be connected to the return air lane. Generally, there are two layout methods: ① Pre-excavate the next adjacent working face cut-out and auxiliary transport lane, and the airflow passes through the working face transport lane and auxiliary transport lane (original return air lane) to enter the retaining lane area, and then flows into the return air lane of the mining area through the next working face cut-out and auxiliary transport lane. ② Arrange a boundary return air lane connected to the return air lane, and the airflow passes through the working face transport lane and auxiliary transport lane, and flows into the return air lane through the retaining lane area and the boundary return air lane. Both of the above layout methods can form a Y-type ventilation system, and the upper corner where gas is easily accumulated at the intersection of the original return air lane and the working face is eliminated, thereby fundamentally solving the problem of excessive gas in the upper corner. However, many mines are plagued by problems such as tight mining and excavation connections and low tunnel excavation efficiency. They are unable to arrange the next working face cutting eye and auxiliary transport tunnel or boundary return air tunnel in advance, and are unable to form a return air passage.

[0003] At the same time, the traditional method of retaining a lane along the goaf has high requirements on the strength of the laneside support. After the mining of the current working face is completed, the lane will still be used as the mining lane for the next working face. The surrounding rock of the lane is greatly deformed by the secondary mining, making maintenance difficult. The laneside support must have sufficient strength to cut off the roof on one side of the goaf and support the roof on the inner side of the lane to ensure the stability of the retained lane roof. Generally, flexible formwork concrete walls or concrete columns are used, and the filling materials are all concrete. This leads to high investment in the lane-retaining system along the goaf, complex construction system, large material transportation volume, long construction time, high lane-retaining cost, and other problems. In a short period of time, there is no better high-strength and low-cost material to replace concrete materials. Summary of the invention

[0004] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0005] To this end, the purpose of this application is to propose a method for arranging mining tunnels based on gas control, using double-lane excavation to improve excavation efficiency, using high-water material laneside support technology, and completing staged lane retention with the assistance of rock-blocking supports and unit supports. Double-lane excavation forms a connecting lane to achieve Y-shaped ventilation of the working face and solve the problem of excessive gas in the upper corner. At the same time, due to the use of a staged lane retention mode, and the regional fracturing and unloading treatment of the lateral roof in advance, and the coordinated control of the roof with rock-blocking supports and unit supports, the laneside support body can choose a low-strength high-water filling material, which has the advantages of small material consumption, simple filling process, and low cost, and can effectively reduce the pressure of auxiliary transportation and improve the efficiency of lane retention.

[0006] In order to achieve the above-mentioned purpose, the present application proposes a method for arranging mining tunnels based on gas control, which includes the following process:

[0007] A transport tunnel and an auxiliary transport tunnel are arranged on both sides of the working face, and a return air tunnel is arranged on one side of the auxiliary transport tunnel in parallel with the auxiliary transport tunnel. A section coal pillar is left between the auxiliary transport tunnel and the return air tunnel. A plurality of connecting tunnels connected with the auxiliary transport tunnel and the return air tunnel are arranged on the section coal pillar along the arrangement direction of the auxiliary transport tunnel, and the connecting tunnels are sealed and blocked;

[0008] A self-moving rock-blocking support is installed on one side of the mining wall at a certain distance extending from the auxiliary transport lane to the rear of the working face. The first connecting lane near the tail lane of the auxiliary transport lane is opened and flush with the initial cut of the working face. During the mining process, the rock-blocking support moves forward with the working face, and the wall is constructed in a staged wall-retaining manner. At the same time, a plurality of unit supports are arranged on the side of the wall in the auxiliary transport lane to assist the wall in supporting the lateral roof of the goaf. The lane where the unit support is located forms a staged lane, and as the working face advances, the tail unit support farthest from the working face is transported to the head position behind the end of the working face;

[0009] After the working face advances to a certain distance after entering the goaf through the second connecting tunnel, the second connecting tunnel is opened and the first connecting tunnel is closed. The fresh air flow from the transport tunnel passes through the working face and reaches the end. After merging with the fresh air flow from the auxiliary transport tunnel, it enters the stage retention tunnel, flows into the return air tunnel through the opened and sealed connecting tunnel, and finally merges into the return air tunnel of the mining area, and the mining operation is carried out in this way.

[0010] Furthermore, it also includes: before the working face is mined, workers use the roof gas extraction boreholes constructed by multiple gas drilling sites on one side of the auxiliary transport tunnel to perform regional fracturing, so as to cut off the connection between the auxiliary transport tunnel and the lateral roof of the goaf.

[0011] Furthermore, when the mining working face is formed and the mining equipment has not yet been installed, the specific process of extending the auxiliary transport lane a certain distance behind the working face and installing a self-moving rock-blocking support to the side of the mining wall is as follows: extend the auxiliary transport lane a certain distance behind the working face, and expand the lane by brushing the wall to the side of the mining wall, reserving an installation area for the rock-blocking support, install the rock-blocking support in the brushing area at the rear of the auxiliary transport lane, and then install the working face hydraulic support 6 to connect with the rock-blocking support.

[0012] Furthermore, it also includes: after the unit support is transported to the point where it is separated from the first connecting tunnel, a closed isolation section is arranged at the tail tunnel for isolation.

[0013] Furthermore, the sealed isolation section adopts a flexible isolation net with a double-layer metal net and a flame-retardant colored strip cloth sandwiched in the middle.

[0014] Furthermore, the specific arrangement method of the flexible isolation net is as follows: short anchor rods are used to fix the flexible isolation net on the top plate, the bottom plate and the two sides of the tunnel.

[0015] Furthermore, polyurethane high-toughness material is sprayed on the metal mesh.

[0016] Furthermore, the lane between the tail unit support and the connecting lane is ventilated by a local fan installed in the auxiliary transport lane.

[0017] Furthermore, when constructing the wall, the high-water material is transported to the wall retention position through the filling pipeline for filling.

[0018] Furthermore, the specific process of transporting high-water-content materials to the wall retention position for filling through the filling pipeline is as follows: the high-water-content material filling station is arranged at a certain position of the auxiliary transport tunnel working surface, the high-water-content material is transported to the filling station position through the auxiliary transportation system, and transported to the wall retention position through the filling pipeline by the mixing pumping system for filling.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is a plan view of the overall layout of the working surface system of the present invention.

[0022] Figure 2 The present invention Figure 1 AA cross-section diagram.

[0023] Figure 3 The present invention Figure 1 BB cross-section diagram.

[0024] Figure 4 The present invention Figure 1 CC cross-section diagram.

[0025] In the figure: 1. Auxiliary transport lane; 2. Transport lane; 3. Return air lane; 4. Communication lane; 5. Enclosed wall; 6. Hydraulic support of working face; 7. Stage reserved lane; 8. Goaf; 9. Filling station; 10. Local fan ventilator; 11. Filling pipeline; 12. Air duct; 13. Bar bracket; 14. Unit bracket; 15. Head unit bracket; 16. Tail unit bracket; 17. Wall; 19. Tail lane; 20. Sealed isolation section; 21. Tension anchor rod; 22. Short anchor rod; 23. Polyurethane high-toughness material; 24. Metal mesh; 25. Flame-retardant colored strip cloth. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0027] Reference Figure 1-4 , a method for arranging mining tunnels based on gas control, including the following processes:

[0028] Transport tunnel 2 and auxiliary transport tunnel 1 are arranged on both sides of the working face. At the same time, return air tunnel 3 is arranged on one side of the auxiliary transport tunnel 1 and is parallel to the auxiliary transport tunnel 1. The return air tunnel 3 can also be used as the transport tunnel of the next working face. A section coal pillar is left between the auxiliary transport tunnel 1 and the return air tunnel 3. A plurality of connecting tunnels 4 connected with the auxiliary transport tunnel 1 and the return air tunnel 3 are arranged on the section coal pillar along the layout direction of the auxiliary transport tunnel 1. The connecting tunnel 4 is sealed and blocked to form a closed wall 5. Double tunnel excavation is adopted to improve the excavation efficiency.

[0029] A self-moving rock-blocking support 13 is installed on one side of the mining wall at a certain distance extending from the auxiliary transport tunnel 1 to the rear of the working face. The first connecting tunnel near the tail tunnel 19 of the auxiliary transport tunnel 1 is opened and flush with the initial cutting eye of the working face. During the mining process, the rock-blocking support 13 moves forward with the working face, and the wall is constructed by a staged wall retention method. The wall is used to isolate the goaf. Since the wall relies on the unit support 16 to assist in top control, the wall strength does not need to be too high, and it is sufficient to reach the self-stabilizing level. Therefore, the wall is made of high-water material, and the water-cement ratio of the high-water material can be appropriately increased, which reduces the amount of wall filling material used and effectively relieves the pressure on the auxiliary transportation system. The high-water material wall material used has low cost. Compared with the flexible formwork concrete wall of the same volume, the cost is reduced by more than 40%, and the tunnel service cycle is short and the maintenance cost is low.

[0030] In addition, it should be noted that a wall 17 is used to isolate the goaf 8, and at the same time, a plurality of unit supports 14 are arranged on the side of the wall 17 in the auxiliary transport tunnel 1 to assist the wall 17 in supporting the lateral roof of the goaf 8. The tunnel where the unit supports 14 are located forms a staged tunnel 7. As the working face advances, the tail unit support 16 at the farthest end of the working face is transported to the head position behind the end of the working face to form a head unit support 15. The unit supports 14 are used to support the staged tunnel 7. The unit supports 14 have high support strength and good roof control effect. Moreover, the unit supports 14 are one-time supports. The unit supports 14 are transported from the row to the head of the row one by one by a unit support trolley, which avoids damage to the roof caused by repeated support and is more conducive to roof management. Moreover, the rock retaining support 13 can move by itself, and the unit supports 14 are transported by a support transporter. The degree of mechanization is high, and the process of manually erecting rock retaining pillars and removing individual pillars is eliminated, thereby saving labor costs and effectively improving support efficiency.

[0031] Specifically, the stage-retained lane 7 uses the rock retaining support 13 at the rear of the working face to isolate the goaf 8, builds a high-water material wall 17 within the empty top range of the rock retaining support 13, and uses the unit support 14 to assist in supporting the lateral roof of the goaf 8, thereby alleviating the degree of pressure deformation of the high-water material wall 17. The high-water material wall 17 reaches the initial setting state before leaving the rock retaining support 13, and has a certain bearing capacity. After entering the goaf 8, it mainly plays the role of isolating the goaf 8, and the pressure is relatively small. Therefore, the width of the wall 17 can be adjusted according to the height of the lane, and the aspect ratio of not less than 1:4 can meet the requirements. The unit support 14 is arranged on the inner side of the wall 17. As the working face advances, a special support transporter is used to transport the unit support 14 at the farthest end of the working face to the head position behind the end of the working face.

[0032] It should also be noted that after the working face advances to a certain distance after entering the goaf 8 at the second connecting tunnel, the second connecting tunnel is opened and the first connecting tunnel is closed. The fresh air flow from the transport tunnel 2 passes through the working face and reaches the end, and after merging with the fresh air flow from the auxiliary transport tunnel 1, it enters the stage retention tunnel 7, flows into the return air tunnel through the opened and sealed connecting tunnel 4, and finally merges into the return air tunnel of the mining area, and the mining operation is carried out in turn. The connecting tunnel 4 is connected with the stage retention tunnel 7 to form a two-in-one-return Y-shaped ventilation system, which can achieve the two-in-one-return Y-shaped ventilation requirements for high-gas working faces that cannot achieve Y-type ventilation due to tight mining and excavation continuity, effectively solve the problem of gas accumulation in the upper corner, and reduce the difficulty of gas management on the working face.

[0033] In some embodiments, it also includes: before the working face is mined, workers use the roof gas extraction boreholes constructed by multiple gas drilling sites on one side of the auxiliary transport tunnel 1 to perform regional fracturing to cut off the connection between the auxiliary transport tunnel 1 and the lateral roof of the goaf 8.

[0034] Specifically, before the working face is mined, the high-position gas extraction boreholes in the gas drilling site are used to perform regional fracturing on the lateral roof of the tunnel, thereby destroying the integrity of the lateral roof of the tunnel so that it collapses in time and fills the goaf 8 after entering the goaf 8, thereby reducing the stress level of the tunnel in the remaining tunnel area and ensuring the safety of the remaining tunnel. The high-position gas extraction boreholes are used to achieve pre-cracking of the lateral roof of the goaf 8, which reduces the stress of the tunnel without affecting the gas extraction purpose of the high-position boreholes. At the same time, regional fracturing is used to increase the expansion range of the roof cracks around the hole wall, which is beneficial to the improvement of the gas extraction effect.

[0035] In other words, the present application can effectively control the deformation of the tunnel within the scope of the stage retained tunnel 7, use regional pressure relief technology to cut off the lateral roof of the goaf to reduce the stress level of the tunnel, and at the same time cooperate with the strong support means of the unit support 14 to reduce the subsidence of the roof of the stage retained tunnel 7 area and the deformation of the high-water material wall 17, ensuring sufficient ventilation section.

[0036] In some embodiments, when the mining working face is formed and the mining equipment has not yet been installed, the specific process of extending the auxiliary transport tunnel 1 a certain distance behind the working face and installing a self-moving rock-blocking support 13 on the mining side is as follows: extend the auxiliary transport tunnel 1 a certain distance behind the working face, and expand the tunnel to the mining side by brushing the side, reserving an installation area for the rock-blocking support 13, install the rock-blocking support 13 in the brushing area at the rear of the auxiliary transport tunnel 1, and then install the working face hydraulic support 6 and connect it to the rock-blocking support 13.

[0037] In some embodiments, it also includes: after the unit support 14 is transported to the point where it leaves the first connecting tunnel, a closed isolation section 20 is arranged at the tail tunnel for isolation.

[0038] Specifically, the support range of the rock retaining support 13 shall not be less than 1.5 times the daily footage of the working face, ensuring that the high-water material wall 17 has a certain strength and deformation resistance when it is separated from the rock retaining support 13. The support range of the unit support 1 is the spacing of the connecting tunnels 4 + 30m, ensuring that there is at least one connecting tunnel 4 available for ventilation within the length of the stage reserved tunnel 7.

[0039] In some embodiments, the sealed isolation section 20 uses a flexible isolation net with a double-layer metal mesh 24 and a flame-retardant colored striped cloth 25 sandwiched in the middle.

[0040] In some embodiments, the specific arrangement method of the flexible isolation net is as follows: use short anchor rods 22 to fix the flexible isolation net on the top plate, bottom plate and both sides of the tunnel. The top plate, bottom plate and both sides are fixed with short anchor rods to prevent air leakage, and the tail tunnel at the rear of the stage tunnel 7 is sealed in time to prevent harmful gases such as gas from accumulating in the tail tunnel and entering the range of the stage tunnel 7.

[0041] In some embodiments, a polyurethane high-toughness material 23 is sprayed on the metal mesh 24 .

[0042] In some embodiments, the tunnel between the tail unit bracket 14 and the connecting tunnel 4 is ventilated by a local fan ventilator 10 installed in the auxiliary transport tunnel 1, that is, the outlet end of the wind tube 20 of the local ventilator 10 is extended straight to the tunnel between the tail unit bracket 14 and the connecting tunnel 4 to ensure that gas does not gather in this range.

[0043] Furthermore, when constructing the wall 17, the high-water material is transported to the wall position through the filling pipeline 11 for filling, such as Figure 1 As shown, in front of the wall 17 is a wall area 18 to be filled.

[0044] Furthermore, the specific process of transporting high-water-content materials to the wall retention position for filling through the filling pipeline 11 is as follows: the high-water-content material filling station 9 is arranged at a certain position of the working surface of the auxiliary transport tunnel 1, and the high-water-content materials are transported to the filling station position through the auxiliary transportation system, and transported to the wall retention position through the filling pipeline by the mixing pumping system for filling.

[0045] Specifically, the high-water-density material filling station is arranged 100m ahead of the working face of the auxiliary transport tunnel 1. The high-water-density material is transported to the filling station through the auxiliary transportation system, and then transported to the wall retention position through the filling pipeline by the mixing pumping system. The high-water-density material wall uses flame-retardant filling bags with tension anchor rods 21 inside to improve lateral deformation resistance.

[0046] The following is a detailed description of the method for arranging mining tunnels based on gas control in conjunction with specific embodiments.

[0047] The average thickness of the No. 3 coal seam in a high-gas mine is 4.4m. It is a medium-hard coal seam with a coal seam inclination of 2 to 5°. The roof is a relatively stable Class II roof. The fully mechanized one-time mining and full-height caving method is adopted, and the daily advancement speed of the working face is 8m. The auxiliary transport tunnel adopts double tunnel excavation of continuous mining machines. The tunnels are arranged along the roof, and the distance between the connecting tunnels is 50m. The height of the auxiliary transport tunnel is 3.8m and the width is 5.4m. The height of the connecting tunnel is 3.8m and the width is 5m. A new technology of staged Y-shaped tunnel layout with regional pressure relief + strong support top control + high-water material isolation of the goaf is adopted. The specific construction method is as follows:

[0048] (1) During the tunnel excavation, the auxiliary transport tunnel 1 and the return air tunnel 3 (the transport tunnel of the next working face) of the working face adopt the double tunnel excavation technology, and a connecting tunnel 4 is excavated every 50m. After the tunnel excavation is completed, except for the first connecting tunnel at the same level as the initial cutting eye, the other connecting tunnels 4 are sealed and blocked to form a two-in and one-return Y-shaped ventilation system. The auxiliary transport tunnel 1 extends 20m to the rear of the working face to arrange the installation tunnel of the bar support 13, and the installation tunnel expands 1.6m to the mining side of the working face, and the total width of the tunnel is 7m.

[0049] (2) A gas drilling site is excavated on one side of the mining wall every 400 m on the working face. Six high-position gas boreholes are constructed in each drilling site with a drilling depth of 450 m to 500 m. Regional fracturing is carried out using two boreholes with a horizontal distance of 5 m from the inner side of the mining wall. The vertical layers of the two boreholes are 20 m and 32 m respectively, which are used to cut off the connection between the auxiliary transport tunnel 1 and the lateral roof of the goaf 8 to achieve the purpose of pressure relief.

[0050] (3) Before the installation of the working face equipment, the self-moving rock retaining support is arranged in the tail tunnel expansion area in advance and connected to the working face hydraulic support 6 through the push cylinder. The rock retaining support 13 is a group of two, with a total length of 15m. The tail tunnel adopts the local fan 10 for air supply. A high-water material wall 17 is reserved close to the rock retaining support 13. The size of the wall 17 is width × height = 1m × 3.8m, and the reserved range is 10m from the initial cutting eye to the installation tunnel.

[0051] (4) The first connecting tunnel is flush with the initial cut of the working face and is connected to the transport tunnel 2 of the next working face to form a return air channel. During the initial mining of the working face, the gangue retaining support 13 moves forward with the working face. According to the advancement speed of the working face, a 1m wide high-water material wall 17 is left to ensure that the distance between the wall and the working face is no more than 5m. The unit support 14 is erected close to the filled high-water material wall, with a center distance of 3m, and is transported to the support location by the support transport vehicle through the auxiliary transport tunnel 1.

[0052] (5) When the working face advances 80m, the second connecting tunnel reaches 30m behind the working face, the second connecting tunnel is opened and sealed, and the first connecting tunnel is closed. When the support length of the unit support 14 reaches 80m, no more unit supports 14 are added. As the working face continues to advance, the unit supports 14 are moved from the end of the row farthest from the working face to the head of the row. According to the speed of the working face, 3 units are moved every day to ensure that the unit supports 14 are closely following the high-water material wall 17.

[0053] (6) When the stage reserved lane 7 (within the support range of the unit support 14) is separated from the first connecting lane, the tail lane behind the stage reserved lane 7 is promptly sealed and isolated, and a flexible isolation net composed of a double-layer metal mesh 24 with a layer of flame-retardant colored strip cloth 25 sandwiched in the middle is used. According to the remaining cross-sectional size of the lane, an appropriate area of ​​isolation net is processed in advance, and a 20% surplus is reserved. When installing the isolation net, first use a 0.5m short anchor rod 22 to fix the isolation net above the top plate, and then use the same method to fix the two sides and the bottom plate, with a short anchor rod spacing of 1.5m.

[0054] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0055] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for arranging mining tunnels based on gas control, characterized in that: The process includes the following: A transport tunnel and an auxiliary transport tunnel are arranged on both sides of the working face, and a return air tunnel is arranged on one side of the auxiliary transport tunnel in parallel with the auxiliary transport tunnel. A section coal pillar is left between the auxiliary transport tunnel and the return air tunnel. A plurality of connecting tunnels connected with the auxiliary transport tunnel and the return air tunnel are arranged on the section coal pillar along the arrangement direction of the auxiliary transport tunnel, and the connecting tunnels are sealed and blocked; A self-moving rock-blocking support is installed on one side of the mining wall at a certain distance extending from the auxiliary transport lane to the rear of the working face. The first connecting lane near the tail lane of the auxiliary transport lane is opened and flush with the initial cut of the working face. During the mining process, the rock-blocking support moves forward with the working face, and the wall is constructed in a staged wall-retaining manner. At the same time, a plurality of unit supports are arranged on the side of the wall in the auxiliary transport lane to assist the wall in supporting the lateral roof of the goaf. The lane where the unit support is located forms a staged lane, and as the working face advances, the tail unit support farthest from the working face is transported to the head position behind the end of the working face; The working face is advanced to a certain distance after the second connecting tunnel enters the goaf. The second connecting tunnel is opened and the first connecting tunnel is closed. The fresh air flow from the transport tunnel passes through the working face and reaches the end. After merging with the fresh air flow from the auxiliary transport tunnel, it enters the stage retention tunnel, flows into the return air tunnel through the opened and sealed connecting tunnel, and finally merges into the return air tunnel of the mining area. The mining operation is carried out in this way.

2. A method for arranging mining tunnels based on gas control as claimed in claim 1, characterized in that: Also includes: Before mining the working face, regional fracturing is carried out using the roof gas extraction boreholes constructed by multiple gas drilling sites on the side of the auxiliary transport tunnel to cut off the connection between the auxiliary transport tunnel and the lateral roof of the goaf.

3. A method for arranging mining tunnels based on gas control as claimed in claim 1, characterized in that: The specific process of extending the auxiliary transport tunnel a certain distance behind the working face and installing a self-moving rock-blocking support to the side of the mining wall is as follows: extend the auxiliary transport tunnel a certain distance behind the working face, and expand the tunnel to the side of the mining wall by brushing the wall, reserving an installation area for the rock-blocking support, install the rock-blocking support in the brushing area at the rear of the auxiliary transport tunnel, and then install the working face hydraulic support to connect with the rock-blocking support.

4. A method for arranging mining tunnels based on gas control as claimed in claim 1, characterized in that: Also includes: When the unit support is transported to a place away from the first connecting tunnel, a closed isolation section is arranged at the tail tunnel for isolation.

5. A method for arranging mining tunnels based on gas control as claimed in claim 4, characterized in that: The enclosed isolation section adopts a flexible isolation net with a double-layer metal net sandwiched between flame-retardant colored strips of cloth.

6. A method for arranging mining tunnels based on gas control as claimed in claim 5, characterized in that: The specific arrangement method of the flexible isolation net is as follows: short anchor rods are used to fix the flexible isolation net on the top plate, the bottom plate and the two sides of the tunnel.

7. A method for arranging mining tunnels based on gas control as claimed in claim 6, characterized in that: Polyurethane high-toughness material is sprayed on the metal mesh.

8. A method for arranging mining tunnels based on gas control as claimed in claim 1, characterized in that: The lane between the tail unit support and the connecting lane is ventilated by a local fan ventilator installed in the auxiliary transport lane.

9. A method for arranging mining tunnels based on gas control as claimed in claim 1, characterized in that: When constructing the wall, the high-water material is transported to the wall retention position through the filling pipeline for filling.

10. A method for arranging mining tunnels based on gas control as claimed in claim 9, characterized in that: The specific process of transporting high-water-content materials to the wall retention position for filling through the filling pipeline is as follows: the high-water-content material filling station is arranged at a certain position of the auxiliary transport tunnel working surface, the high-water-content material is transported to the filling station through the auxiliary transportation system, and transported to the wall retention position through the filling pipeline by the mixing pumping system for filling.

Images