Ground station building roadway-along wall filling coal pillar recovery method

Abstract

The invention provides a method for recovering a filling coal pillar of a roadway-along wall built by building a station on the ground. Comprising the steps of 1, forming a filling system; 2, a first tunneling roadway (4) is tunneled; 3, sealing and filling the boundary air guide way (3); 4, building a wall between the first tunneling roadway (4) and the second tunneling roadway (5), and filling the boundary air guide roadway (3); 5, the first tunneling roadway (4) is sealed and filled; and step 6, repeating the steps 2-5 in the same way, tunneling the third tunneling roadway (6), and filling the first tunneling roadway (4) until all coal is mined. According to the method, double-roadway tunneling is adopted, two emergency exits are provided for personnel during tunneling and filling, gaps of the goaf can be reduced through the slurry filling body, the possibility of gas accumulation is reduced, and therefore the risk of gas explosion is reduced; the single props and the flexible film hanging bags are used for supporting the top plate between the two roadways, the supporting engineering amount is reduced, and the labor intensity of workers and the engineering cost are reduced.

Description

Technical Field

[0001] The invention relates to the field of coal pillar recovery methods, and in particular to a method for recovering coal pillars for wall filling along tunnels during ground station construction. Background Art

[0002] As the mining time of mines is prolonged, the mining depth is increasing, the difficulty of mine mining layout is increasing, the recoverable resource reserves are also decreasing, and the contradiction between the rapidly developing domestic economic energy demand and the gradual depletion of coal resource reserves is becoming increasingly prominent. The low coal output rate has aggravated this problem. In the face of this situation, the method usually adopted is to further mine deeper coal seams or recover the coal pillars left during the construction of the mine or during the mining process. Under the current mining technology conditions, the main factors affecting the mining rate of coal are protective coal pillars, coal seams that are difficult to mine under subsidence pillars, faults, and water bodies, especially the protective coal pillars between tunnels have great recovery value. The reason for leaving coal pillars is usually to protect production and tunnel construction. This project wastes a lot of coal resources and seriously shortens the service life of existing mines. Therefore, if the coal pillars are recovered, it will not only help to improve the recovery rate of coal resources but also help to increase the economic benefits of mines.

[0003] At present, paste filling is one of the ways to recover various types of protective coal pillars in mines. Paste filling can provide safety protection and prevent environmental problems such as surface collapse, soil erosion, and mining area environmental pollution caused by coal pillar recovery and collapse of overlying rock strata in goafs. Therefore, a method for recovering coal pillars by building walls along the roadway is a new coal pillar recovery method that can not only achieve coal pillar recovery, but also effectively control rock strata movement. Summary of the invention

[0004] The purpose of the present invention is to provide a method for recovering coal pillars filled in a tunnel along a wall when building a ground station.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention relates to a method for recovering coal pillars filled in a tunnel along a roadway by building a wall for a ground station, comprising the following steps:

[0007] Step 1: Excavate to form the working face air intake tunnel 2, the boundary air guide tunnel 3, and the working face return air tunnel 1, and form a filling system. At the same time, the grouting pipe 8 laid in the boundary air guide tunnel 3 is also laid;

[0008] Step 2: excavating the first excavation tunnel 4 along the boundary air guide tunnel 3, and at the same time, building a wall between the first excavation tunnel 4 and the boundary air guide tunnel 3 using single pillars 9 and soft film hanging bags 10;

[0009] Step 3: When the excavation of the first excavation tunnel 4 is completed, the grouting pipe 8 laid in the first excavation tunnel 4 is also laid, the boundary air guide tunnel 3 is closed, and the boundary air guide tunnel 3 is prepared to be filled with a paste filling body 7;

[0010] Step 4: Start excavating the second excavation tunnel 5, build a wall between the first excavation tunnel 4 and the second excavation tunnel 5 using single pillars 9 and soft film hanging bags 10, and fill the closed boundary air guide tunnel 3 with a paste filling body 7;

[0011] Step 5: When the excavation of the second excavation tunnel 5 is completed, the grouting pipe 8 laid in the second excavation tunnel 5 is also laid, the first excavation tunnel 4 is closed, and the first excavation tunnel 4 is ready to be filled with the paste filling body 7;

[0012] Step 6: Similarly, repeat steps 2 to 5, start excavating the third heading tunnel 6, and use the paste filling body 7 to fill the first heading tunnel 4 until all the coal is mined.

[0013] The working principle of the present invention is: a method for recovering coal pillars by building walls along the roadway while building a station on the ground, comprising the following steps:

[0014] (1) Excavate the air intake tunnel, return air tunnel and boundary air guide tunnel to form a complete underground mining system;

[0015] (2) Excavating the first excavation tunnel on the side of the boundary air guide tunnel, and building a wall between the boundary air guide tunnel and the first excavation tunnel as the excavation progresses;

[0016] (3) When the excavation of the first driving tunnel is completed, the boundary ventilation tunnel is closed;

[0017] (4) Start excavating the second excavation tunnel, build a wall between the two tunnels, and fill the side ventilation tunnel with paste;

[0018] (5) When the excavation of the second excavation tunnel is completed, the first excavation tunnel is closed;

[0019] (6) Similarly, the third tunneling tunnel is excavated and the first tunneling tunnel is backfilled until all the coal is mined.

[0020] The present invention has the following advantages:

[0021] (1) The present invention adopts double-tunnel excavation, which can not only solve the problem of poor stability of total negative pressure ventilation in the mine caused by local ventilation, but also provide two escape tunnels on the excavation working face; during the double-tunnel excavation process, the precast concrete blocks and filling bodies between the two tunnels support the roof, which not only improves the resource recovery rate but also enhances the mining safety.

[0022] (2) The present invention does not require the retention of coal pillars. Instead, the roof is supported by single pillars and flexible film hanging bags, which can achieve rapid and efficient recovery of coal pillars. The use of double-lane excavation can also solve the problem of only one escape lane in single-lane excavation, greatly improving safety in the face of emergencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a plan view of the present invention;

[0024] Figure 2 This is the cross-section of the tunnel;

[0025] Figure 3 The diagram of the air guide boundary tunnel and filling system formed when excavating the first mining face;

[0026] Figure 4 Wall plan for single pillars and flexible film hanging bags;

[0027] Figure 5 It is the closed plan of the boundary wind tunnel;

[0028] Figure 6 It is the plan of the second driving tunnel excavation and the filling of the boundary ventilation tunnel;

[0029] Figure 7 Complete the plan for the second heading tunnel excavation and the boundary ventilation tunnel filling;

[0030] Figure 8 This is the plan of the third driving tunnel excavation and the filling of the boundary ventilation tunnel;

[0031] Figure numerals: 1. Working face return air lane; 2. Working face air inlet lane; 3. Boundary air guide lane; 4. First excavation lane; 5. Second excavation lane; 6. Third excavation lane; 7. Paste filling body; 8. Grouting pipe; 9. Single pillar; 10. Soft film hanging bag; 11. Anchor rod; 12. Anchor cable. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. It should be noted that the following embodiments are only further descriptions of the present invention, but the protection scope of the present invention is not limited to the following embodiments.

[0033] Example

[0034] This embodiment relates to a method for recovering coal pillars filled along the tunnel wall when building a station on the ground. Figure 1 As shown, the following steps are included:

[0035] See Figure 2As shown in the tunnel cross-section diagram, 11 is an anchor rod; 12 is an anchor cable; the spacing between each anchor rod is 500mm; the size of the threaded steel anchor rod of the anchor cable is φ20*2000mm, and the row spacing arranged in the center line of the tunnel is 3000mm; the tunnel width is 4000mm, and the tunnel height is 2100mm.

[0036] Step 1: Excavate to form the working face air intake tunnel 2, the boundary air guide tunnel 3, the working face return air tunnel 1, and form a filling system. At the same time, the grouting pipe 8 laid in the boundary air guide tunnel 3 is also completed; see Figure 3 As shown;

[0037] Step 2: Dig the first excavation tunnel 4 along the boundary air guide tunnel 3, and at the same time, use the single support 9 and the soft film hanging bag 10 to build a wall between the first excavation tunnel 4 and the boundary air guide tunnel 3. Figure 4 As shown;

[0038] Step 3: When the excavation of the first tunnel 4 is completed, the grouting pipe 8 laid in the first tunnel 4 is also completed, and the boundary air guide tunnel 3 is closed. Figure 5 As shown, the boundary air guide tunnel 3 is prepared to be filled with a paste filling body 7;

[0039] Step 4: Start the excavation of the second excavation tunnel 5, and at the same time, use the single pillar 9 and the soft film hanging bag 10 to build a wall between the first excavation tunnel 4 and the second excavation tunnel 5, and at the same time, fill the closed boundary air guide tunnel 3 with the paste filling body 7; Figure 6 , 7 As shown;

[0040] Step 5: When the excavation of the second excavation tunnel 5 is completed, the grouting pipe 8 laid in the second excavation tunnel 5 is also laid, the first excavation tunnel 4 is closed, and the first excavation tunnel 4 is ready to be filled with the paste filling body 7;

[0041] Step 6: Repeat steps 2 to 5 and start excavating the third tunnel 6. Use the paste filling body 7 to fill the first tunnel 4 until all the coal is mined. Figure 8 shown.

[0042] The filling tunnels of the present invention are connected in sequence, which is convenient for the transfer of equipment and personnel, and can realize the full mining of coal, realize the mining without coal pillars, and improve the resource recovery rate of coal; the present invention uses a single pillar, a soft film hanging bag and a slurry filling body to support the roof, effectively control the settlement of the overburden rock, thereby reducing the risk of surface settlement and collapse, and protecting the surface ecological environment; the filling material used in the present invention includes gangue, which reduces the impact of gangue stacking on the environment; the present invention adopts double-lane excavation, and there are two safe exits for personnel during excavation and filling. The slurry filling body can reduce the gap in the goaf and reduce the possibility of gas accumulation, thereby reducing the risk of gas explosion. The present invention uses a single pillar plus a soft film hanging bag to support the roof between the two lanes, which can reduce the amount of support engineering, reduce the labor intensity of personnel, and reduce engineering costs.

[0043] The present invention aims at the problems that the prior art is single-lane excavation, and there is a problem of poor stability of the total negative pressure ventilation of the mine caused by local ventilation, and there is only one escape tunnel, which is insufficient to cope with emergencies and has weak safety; and although the prior art finally recovers all coal pillars, there are still coal pillars left in the coal seam mining process, resulting in low efficiency of coal pillar recovery; and in the prior art, the two working faces are far apart, and it takes a long time to move from the first working face to the second working face; the present invention is to solve the problems of poor stability of the total negative pressure ventilation of the mine caused by local ventilation in single-lane excavation in the prior art, there is only one escape exit, coal pillars are left in the working face mining process, and the two working faces are far apart, resulting in a long moving time.

[0044] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various modifications or variations within the scope of the claims, which will not affect the essence of the present invention.

Claims

1. A method for recovering coal pillars by building walls along the roadway for ground station construction, characterized in that: The following steps are involved: Step 1: Excavate the working face air intake tunnel (2), the boundary air guide tunnel (3), and the working face return air tunnel (1) respectively, and form a filling system; Step 2: excavating a first excavation tunnel (4) along the boundary air guide tunnel (3), and building a wall between the first excavation tunnel (4) and the boundary air guide tunnel (3) using single pillars (9) and soft film hanging bags (10); Step 3: When the excavation of the first excavation tunnel (4) is completed, the boundary air guide tunnel (3) is closed and the boundary air guide tunnel (3) is prepared to be filled with a paste filling body (7); Step 4: Start excavating the second excavation tunnel (5), build a wall between the first excavation tunnel (4) and the second excavation tunnel (5) using single pillars (9) and soft film hanging bags (10), and fill the closed boundary air guide tunnel (3) with a paste filling body (7); Step 5: When the excavation of the second excavation tunnel (5) is completed, the first excavation tunnel (4) is closed and the first excavation tunnel (4) is prepared to be filled with a paste filling body (7); Step 6: Similarly, repeat steps 2 to 5, start excavating the third heading tunnel (6), and use the paste filling body (7) to fill the first heading tunnel (4) until all the coal is mined.

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