Long-wall fully-mechanized coal mining paste filling advancing type stoping method

Abstract

The invention relates to the field of coal mine filling mining, in particular to a long-wall fully-mechanized coal mining paste filling advancing type stoping method which comprises the steps that 1 # working face return air and a transportation crossheading are tunneled to a main roadway protection coal pillar line, and a coal mining channel is tunneled to be communicated with the return air and the transportation crossheading to arrange coal mining equipment; stoping and filling the 1 # working face in an advancing mode, retaining the gob-side entry of the return air and the transportation crossheading, and not filling the final coal mining channel; isolating a 1 # working face transportation crossheading from a transportation main roadway; the 1 # working face transportation gate road is used as a 2 # working face air return gate road; tunneling a 2 # working face transportation crossheading to a main roadway protection coal pillar line, tunneling a 2 # working face coal mining channel to communicate with return air and the transportation crossheading, and arranging coal mining equipment; the second working face is stoped and filled in an advancing mode, gob-side entry retaining is conducted on the transportation crossheading, and a coal mining channel of the second working face is not filled finally; and subsequent working faces sequentially refer to the previous working face to carry out advancing type stoping and filling. According to the method, the roadway tunneling rate can be reduced, and the defects of traditional advancing mining are overcome.

Description

Technical Field

[0001] The invention relates to the field of coal mine filling mining, in particular to a longwall fully mechanized mining paste filling forward mining method. Background Art

[0002] The amount of tunnel excavation in coal mines is large, which requires coal mining enterprises to invest a lot of manpower, material resources and time to excavate tunnels in preparation for working face mining, otherwise it will cause mining and excavation imbalance in the mine and affect coal production. When the working face adopts forward mining, the chute on both sides of the working face does not need to be excavated in advance, and the tunnel can be left along the goaf as the working face advances. Its advantages are that it can reduce the amount of tunnel excavation and improve the resource recovery rate, but it also has disadvantages such as the tunnel being easily affected by mine pressure, high maintenance cost and long time for moving and reversing. Secondly, since the chute on both sides of the working face is not excavated in advance, the interference between the tunnel excavation and coal mining is large. If the caving method is used for mining, the fresh air will pass through the goaf first during coal mining, resulting in large air leakage and poor fresh air quality. There are also hidden dangers of gas accumulation or spontaneous combustion of coal dust in the goaf. Summary of the invention

[0003] In view of the above technical problems, the present invention proposes a longwall fully mechanized mining paste filling forward mining method, comprising the following steps:

[0004] S1: Several working faces are arranged in sequence along the length of the main tunnel on one side of the main tunnel and numbered in sequence;

[0005] S2: Excavate the return air chute of the No. 1 working face and the transport chute of the No. 1 working face to the main roadway to protect the coal pillar line, excavate the coal mining channel of the No. 1 working face to connect the return air chute of the No. 1 working face and the transport chute of the No. 1 working face, and arrange the coal mining equipment;

[0006] S3: Use the forward method to mine and fill the No. 1 working face, and retain the gob-side lanes of the No. 1 working face return air chute and the No. 1 working face transport chute. The final No. 1 working face coal mining channel is not filled;

[0007] S4: disconnect the connection between the transport chute of the 1# working face and the transport main roadway; use the transport chute of the 1# working face as the return air chute of the 2# working face; excavate the transport chute of the 2# working face to the main roadway to protect the coal pillar line, excavate the coal mining channel of the 2# working face to connect the return air chute of the 2# working face and the transport chute of the 2# working face, and arrange the coal mining equipment;

[0008] S5: Use the forward method to mine and fill the 2# working face, and leave the gob for the 2# working face transport drift. The final 2# working face coal mining channel is not filled;

[0009] S6: Subsequent working faces carry out forward mining and filling in accordance with the mining and filling methods of the previous working face.

[0010] Preferably, in step S2, the return air chute of the No. 1 working face is excavated from the return air main tunnel to the main tunnel protective coal pillar line, the transport chute of the No. 1 working face is excavated from the transport main tunnel to the main tunnel protective coal pillar line, and then the No. 1 working face coal mining channel is excavated along the main tunnel protective coal pillar line.

[0011] Preferably, in step S2, the coal mining equipment includes a coal mining machine, a hydraulic support, and a scraper conveyor. The head of the scraper conveyor is located in the transport chute, and the head of the coal mining machine faces one end of the transport chute of the No. 1 working face. The hydraulic support adopts a split paste-filled hydraulic support.

[0012] Preferably, in step S2, a transfer machine is installed in the No. 1 working face transport chute, the tail of the transfer machine is overlapped with the head of the scraper conveyor, a unit bracket is installed in the No. 1 working face transport chute close to the side of the lane, and two pulling jacks are installed in the landing chute section at the tail of the transfer machine, which are respectively connected to the hydraulic support base box and the unit bracket base.

[0013] Preferably, in step S3, the coal mining machine cuts out the 1# working face return air chute and the 1# working face transport chute on both sides of the 1# working face while cutting coal; when the filling step distance is reached, a mold support is set on the 1# working face return air chute and the 1# working face transport chute, and then the paste filling material is filled into the goaf.

[0014] Preferably, in step S3, the fresh air passes through the No. 1 working face transport chute from the transport main lane to reach the No. 1 working face coal mining channel and becomes the exhausted air, and the exhausted air passes through the No. 1 working face return air chute to reach the return air main lane; the paste filling pipeline is arranged in the lane through which the exhausted air flows; the coal mined from the No. 1 working face coal mining channel is transported to the transport main lane via the No. 1 working face transport chute.

[0015] Preferably, in step S4, an isolation wall is constructed at the opening of the transport drift of the No. 1 working face and at the protective coal pillar line of the main tunnel.

[0016] Preferably, in step S4, the transport drift of the 2# working face is excavated from the transport main tunnel to the main tunnel protection coal pillar line, and then the 2# working face coal mining channel is excavated along the main tunnel protection coal pillar line.

[0017] Preferably, in step S4, the same coal mining machine, hydraulic support, scraper conveyor and transfer machine as those of the 1# working face are used, and the arrangement is the same.

[0018] Preferably, in step S5, the coal mining machine cuts out a 2# working face transport drift on one side of the working face while cutting coal; when the filling step is reached, a mold support is set up on the 2# working face transport drift, and then the paste filling material is filled into the goaf.

[0019] Preferably, in step S5, the fresh air passes through the 2# working face transport chute from the transport main lane to the 2# working face coal mining channel and becomes the exhausted air, and the exhausted air passes through the 2# working face return air chute, the 1# working face coal mining channel, and the 1# working face return air chute to reach the return air main lane; the paste filling pipeline is arranged in the lane through which the exhausted air flows; the coal mined from the 2# working face coal mining channel is transported to the transport main lane via the 2# working face transport chute.

[0020] The beneficial effect of the longwall fully mechanized paste filling forward mining method of the present invention is that the present invention can effectively solve the problems of air leakage in the goaf during conventional forward mining, the threat of spontaneous combustion on the working face, and the difficulty and high cost of controlling the surrounding rock of the goaf-retained lanes. Moreover, the working face of the present invention only needs to pre-dig the equipment installation channel, and the transportation drift and the return air drift are formed along the goaf-retained lanes during the mining process, which can greatly reduce the tunnel excavation rate, reduce the working face preparation time, and improve the applicability and comprehensive benefits of the filling mining process. The present invention provides a new option for filling mining in mining areas, making the mining of buried coal resources safer, more economical and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the preparation stage of forward mining of the No. 1 working face of longwall fully mechanized paste filling;

[0022] Figure 2 This is a schematic diagram of the end stage of forward mining of the No. 1 working face of longwall fully mechanized paste filling;

[0023] Figure 3 This is a schematic diagram of the forward mining advancement stage of the No. 2 working face of longwall fully mechanized paste filling;

[0024] Figure 4 This is a schematic diagram of the forward mining advancement stage of the 3# working face of longwall fully mechanized paste filling;

[0025] In the figure, 1-return air main tunnel; 2-transport main tunnel; 3-1# working face return air chute; 4-1# working face transport chute; 5-1# working face coal mining passage; 6-1# working face; 7-2# working face; 8-3# working face; 9-isolation wall; 10-2# working face return air chute; 11-2# working face transport chute; 12-2# working face coal mining passage; 13-3# working face return air chute; 14-3# working face coal mining passage; 15-3# working face transport chute. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1-4 As shown, the present invention proposes a longwall fully mechanized mining paste filling forward mining method, comprising the following steps:

[0028] S1: Figure 1 As shown, several working faces are arranged in sequence along the length direction of the main tunnel on one side of the main tunnel, and the working faces are numbered in sequence;

[0029] S2: Figure 1 As shown, the return air chute 3 of the 1# working face is excavated from the return air main tunnel 1 to the main tunnel protection coal pillar line, the transport chute 4 of the 1# working face is excavated from the transport main tunnel 2 to the main tunnel protection coal pillar line, and then the 1# working face coal mining channel 5 is excavated along the main tunnel protection coal pillar line to connect the return air chute 3 of the 1# working face and the transport chute 4 of the 1# working face, and the coal mining equipment is arranged in the 1# working face coal mining channel 5;

[0030] In this embodiment, the return air main tunnel 1 is close to the working face, the transport main tunnel 2 is relatively far away from the working face, and the transport chute 4 of the 1# working face passes through the return air main tunnel 1 from the lower part;

[0031] The coal mining equipment includes a coal mining machine, a hydraulic support, and a scraper conveyor; the head of the scraper conveyor is located at the No. 1 working face transport chute 4, and the tail is located at the No. 1 working face return air chute 3. The head of the coal mining machine faces one end of the No. 1 working face transport chute 4. The hydraulic support adopts a ZC6000 / 22 / 42D split paste filling hydraulic support to achieve parallel operation of coal cutting, support, isolation, and filling processes; a transfer machine is installed in the No. 1 working face transport chute 4, and the tail of the transfer machine is overlapped with the head of the scraper conveyor. Two ZQ4000 / 20 / 45 unit supports are installed in the No. 1 working face transport chute 4 near the side of the lane, and two pulling jacks are installed in the landing chute section of the tail of the transfer machine, which are respectively connected to the hydraulic support base box closest to the No. 1 working face transport chute 4 and one of the unit support bases to achieve the movement of the transfer machine;

[0032] Among them, the coal mining machine adopts the MG300 / 700-WD model; the coal mining machine adopts a simple head, a single motor is installed at the tail of the machine, the walking part of the coal mining machine can be towed to the position of the simple head, a 0.4m transition pad is installed on the side rocker arm of the coal mining machine head, and the coal mining machine drum cuts through the head unloading point more than 2.0m, so that the coal mining machine head position can cut out the transport chute of the working face, meeting the installation of unit brackets in the tunnel and the passage space of equipment such as transfer machines and crushers.

[0033] S3: Figure 2As shown, the 1# working face 6 is mined by the forward mining method, and the coal mining machine cuts out the 1# working face return air chute 3 and the 1# working face transport chute 4 on both sides of the working face while cutting coal; when the filling step is reached, a partition mold support is set on the 1# working face return air chute 3 and the 1# working face transport chute 4, and then the paste filling material is filled into the goaf to realize the 1# working face return air chute 3 and the 1# working face transport chute 4 leaving lanes along the goaf; the 1# working face 6 is continued to be mined, the goaf is filled, and the lanes are left along the goaf until the 1# working face 6 is mined and filled, but the final 1# working face coal mining channel 5 is not filled;

[0034] Among them, anchor net support is carried out on the return air chute 3 of the 1# working face and the transport chute 4 of the 1# working face. The partition formwork support is a MJ6000 / 24 / 39 type paste filling special lane isolation formwork. In the return air chute 3 of the 1# working face and the transport chute 4 of the 1# working face, a ZQ4000 / 20 / 45 type unit support is used behind the diaphragm support to strengthen the support;

[0035] like Figure 1-2 As shown, the pure arrow indicates the direction of movement of fresh air, the arrow tail plus S indicates exhaust air, and the arrow tail plus a solid circle indicates the direction of coal transportation; the fresh air passes through the No. 1 working face transport chute 4 from the transport main lane 2 to the No. 1 working face coal mining channel 5 to become exhaust air, and the exhaust air passes through the No. 1 working face return air chute 3 to the return air main lane 1; the paste filling pipeline is arranged in the lane through which the exhaust air flows, and the flow direction of the paste filling material is opposite to that of the exhaust air; the coal mined from the No. 1 working face coal mining channel 5 is transported to the transport main lane 2 through the No. 1 working face transport chute 4;

[0036] S4: Figure 2 As shown, a separation wall 9 is constructed at the opening of the No. 1 working face transport chute 4 (the end connected to the transport main lane 2) and at the main lane protection coal pillar line of the No. 1 working face transport chute 4 to block the connection between the No. 1 working face transport chute 4 and the transport main lane 2; the No. 1 working face transport chute 4 with the separation wall 9 is used as the No. 2 working face return air chute 10;

[0037] From the transport tunnel 2, the 2# working face transport chute 11 is excavated to the main tunnel protection coal pillar line, and then the 2# working face coal mining channel 12 is excavated along the main tunnel protection coal pillar line to connect the 2# working face return air chute 10 and the 2# working face transport chute 11, and the coal mining equipment is arranged in the 2# working face coal mining channel 12;

[0038] In this embodiment, the return air main tunnel 1 is close to the working face, the transport main tunnel 2 is relatively far away from the working face, and the 2# working face transport chute 11 passes through the return air main tunnel 1 from the lower part of the return air main tunnel 1;

[0039] The coal mining equipment adopts the same coal mining machine, hydraulic support, and scraper conveyor as those of the 1# working face 6, and the arrangement is the same; the same transfer machine as that of the 1# working face 6 is installed in the 2# working face transport chute 11, and the tail of the transfer machine is overlapped with the head of the scraper conveyor. Two ZQ4000 / 20 / 45 type unit supports are installed near the side of the roadway in the 2# working face transport chute 11, and two pulling jacks are installed in the landing chute section at the tail of the transfer machine, which are respectively connected to the hydraulic support base box closest to the 2# working face transport chute 11 and one of the unit support bases to realize the movement of the transfer machine;

[0040] S5: Figure 3 As shown, the 2# working face 7 is mined by the forward mining method, and the coal mining machine cuts out the 2# working face transport drift 11 on one side of the working face while cutting coal; when the filling step is reached, a mold support is set on the 2# working face transport drift 11, and then the paste filling material is filled into the goaf to realize the 2# working face transport drift 11 leaving a lane along the goaf; the 2# working face 7 is continued to be mined, the goaf is filled, and the lane is left along the goaf until the 2# working face 7 is mined and filled, but the final 2# working face coal mining channel 12 is not filled;

[0041] Among them, anchor net support is carried out on the transport drift 11 of the 2# working face, and the partition formwork support is a MJ6000 / 24 / 39 type paste filling special lane isolation formwork. In the transport drift 11 of the 2# working face, a ZQ4000 / 20 / 45 type unit support is used behind the diaphragm support to strengthen the support;

[0042] like Figure 3-4 As shown, the pure arrow indicates the direction of movement of fresh air, the arrow tail plus S indicates exhaust air, and the arrow tail plus a solid circle indicates the direction of coal transportation; the fresh air passes through the 2# working face transport chute 11 from the transport main lane 2 to the 2# working face coal mining channel 12 to become exhaust air, and the exhaust air passes through the 2# working face return air chute 10, the 1# working face coal mining channel 5, and the 1# working face return air chute 3 to the return air main lane 1; the paste filling pipeline is arranged in the lane through which the exhaust air flows, and the flow direction of the paste filling material is opposite to that of the exhaust air; the coal mined from the 2# working face coal mining channel 12 is transported to the transport main lane 2 via the 2# working face transport chute 11;

[0043] S6: The subsequent working faces carry out forward mining and filling in accordance with the mining and filling methods of the previous working face;

[0044] Take 3# working face 8 as an example. Figure 4As shown, refer to steps S4-S5 to perform longwall fully mechanized mining paste filling work; construct an isolation wall 9 at the opening of the 2# working face transport chute 11 (the end connected to the transport main lane 2) and at the main lane protection coal pillar line of the 2# working face transport chute 11 to block the connection between the 2# working face transport chute 11 and the transport main lane 2; use the 2# working face transport chute 11 with the isolation wall 9 as the 3# working face return air chute 13;

[0045] From the transport tunnel 2, the 3# working face transport chute 15 is excavated to the main tunnel protection coal pillar line, and then the 3# working face coal mining channel 14 is excavated along the main tunnel protection coal pillar line to connect the 3# working face return air chute 13 and the 3# working face transport chute 15, and the coal mining equipment is arranged in the 3# working face coal mining channel 14;

[0046] In this embodiment, the return air main tunnel 1 is close to the working face, the transport main tunnel 2 is relatively far away from the working face, and the 3# working face transport chute 15 passes through the return air main tunnel 1 from the lower part of the return air main tunnel 1;

[0047] The coal mining equipment adopts the same coal mining machine, hydraulic support, and scraper conveyor as those of the 2# working face 7, and the arrangement is the same; the same transfer machine as that of the 2# working face 7 is installed in the 3# working face transport chute 15, and the tail of the transfer machine is overlapped with the head of the scraper conveyor. Two ZQ4000 / 20 / 45 type unit supports are installed near the side of the roadway in the 3# working face transport chute 15, and two pulling jacks are installed in the landing chute section at the tail of the transfer machine, which are respectively connected to the hydraulic support base box closest to the 3# working face transport chute 15 and one of the unit support bases to realize the movement of the transfer machine;

[0048] The 3# working face 8 is mined by the forward mining method. The coal mining machine cuts out the 3# working face transport drift 15 on one side of the working face while cutting coal. When the filling step is reached, a mold support is set on the 3# working face transport drift 15, and then the paste filling material is filled into the goaf to realize the 3# working face transport drift 15 leaving lanes along the goaf. The 3# working face 8 is mined continuously, the goaf is filled, and the lanes are left along the goaf until the 3# working face 8 is mined and filled. However, the final 3# working face coal mining channel 14 is not filled.

[0049] Among them, anchor net support is carried out on the transport drift 15 of the 3# working face. The partition formwork support is a MJ6000 / 24 / 39 type paste filling special lane retention partition formwork. In the transport drift 15 of the 3# working face, a ZQ4000 / 20 / 45 type unit support is used behind the diaphragm support to strengthen the support;

[0050] like Figure 4As shown, the pure arrow indicates the direction of movement of fresh air, the arrow end plus S indicates exhaust air, and the arrow end plus a solid circle indicates the direction of coal transportation; the fresh air passes through the 3# working face transport chute 15 from the transport main tunnel 2 to the 3# working face coal mining channel 14 to become exhaust air, and the exhaust air passes through the 3# working face return air chute 13, the 2# working face coal mining channel 12, the 1# working face coal mining channel 5, and the 1# working face return air chute 3 to reach the return air main tunnel 1; the paste filling pipeline is arranged in the tunnel through which the exhaust air flows, and the flow direction of the paste filling material is opposite to that of the exhaust air; the coal mined from the 3# working face coal mining channel 14 is transported to the transport main tunnel 2 via the 3# working face transport chute 15.

[0051] Although the present invention has been described above with preferred embodiments, it is not intended to limit the present invention. A person skilled in the art of the present invention may make various modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the definition of the claims.

Claims

1. A longwall fully mechanized mining paste filling forward mining method, characterized in that: The steps include: S1: Several working faces are arranged in sequence along the length of the main tunnel on one side of the main tunnel and numbered in sequence; S2: Excavate the return air chute of the No. 1 working face and the transport chute of the No. 1 working face to the main roadway to protect the coal pillar line, excavate the coal mining channel of the No. 1 working face to connect the return air chute of the No. 1 working face and the transport chute of the No. 1 working face, and arrange the coal mining equipment; S3: Use the forward method to mine and fill the No. 1 working face, and retain the gob-side lanes of the No. 1 working face return air chute and the No. 1 working face transport chute. The final No. 1 working face coal mining channel is not filled; S4: disconnect the connection between the transport chute of the 1# working face and the transport main roadway; use the transport chute of the 1# working face as the return air chute of the 2# working face; excavate the transport chute of the 2# working face to the main roadway to protect the coal pillar line, excavate the coal mining channel of the 2# working face to connect the return air chute of the 2# working face and the transport chute of the 2# working face, and arrange the coal mining equipment; S5: Use the forward method to mine and fill the 2# working face, and leave the gob for the 2# working face transport drift. The final 2# working face coal mining channel is not filled; S6: Subsequent working faces carry out forward mining and filling in accordance with the mining and filling methods of the previous working face.

2. The longwall fully mechanized mining paste filling forward mining method according to claim 1 is characterized in that: In step S2, the return air chute of the No. 1 working face is excavated from the return air main tunnel to the main tunnel protective coal pillar line, the transport chute of the No. 1 working face is excavated from the transport main tunnel to the main tunnel protective coal pillar line, and then the No. 1 working face coal mining channel is excavated along the main tunnel protective coal pillar line.

3. The longwall fully mechanized mining paste filling forward mining method according to claim 1 or 2, characterized in that: In step S2, the coal mining equipment includes a coal mining machine, a hydraulic support, and a scraper conveyor. The head of the scraper conveyor is located in the transport chute, and the head of the coal mining machine faces one end of the transport chute of the 1# working face. The hydraulic support adopts a split paste-filled hydraulic support. A transfer machine is installed in the transport chute of the 1# working face. The tail of the transfer machine is overlapped with the head of the scraper conveyor. A unit support is installed in the transport chute of the 1# working face near the side of the lane. Two pulling jacks are installed in the landing chute section at the tail of the transfer machine, which are respectively connected to the hydraulic support base box and the unit support base.

4. The longwall fully mechanized mining paste filling forward mining method according to claim 3 is characterized in that: In step S3, the coal mining machine cuts out the 1# working face return air chute and the 1# working face transport chute on both sides of the 1# working face while cutting coal; when the filling step distance is reached, the mold support is set on the 1# working face return air chute and the 1# working face transport chute, and then the paste filling material is filled into the goaf.

5. The longwall fully mechanized mining paste filling forward mining method according to claim 4 is characterized in that: In step S3, the fresh air passes through the No. 1 working face transport chute from the transport main tunnel to reach the No. 1 working face coal mining channel and becomes exhaust air, and the exhaust air passes through the No. 1 working face return air chute to reach the return air main tunnel; the paste filling pipeline is laid in the tunnel through which the exhaust air flows; the coal mined from the No. 1 working face coal mining channel is transported to the transport main tunnel via the No. 1 working face transport chute.

6. The longwall fully mechanized mining paste filling forward mining method according to claim 5 is characterized in that: In step S4, isolation walls are constructed at the opening of the transport drift of the No. 1 working face and at the protective coal pillar line of the main tunnel.

7. The longwall fully mechanized mining paste filling forward mining method according to claim 6 is characterized in that: In step S4, the transport chute of the 2# working face is excavated from the transport main tunnel to the main tunnel protection coal pillar line, and then the 2# working face coal mining channel is excavated along the main tunnel protection coal pillar line.

8. The longwall fully mechanized mining paste filling forward mining method according to claim 7 is characterized in that: In step S4, the same coal mining machine, hydraulic support, scraper conveyor and transfer machine as those of the 1# working face are used, and the arrangement is the same.

9. The longwall fully mechanized mining paste filling forward mining method according to claim 8, characterized in that: In step S5, the coal mining machine cuts out a 2# working face transport drift on one side of the working face while cutting coal; when the filling step is reached, a mold support is set up on the 2# working face transport drift, and then the paste filling material is filled into the goaf.

10. The longwall fully mechanized mining paste filling forward mining method according to claim 9, characterized in that: In step S5, the fresh air passes through the 2# working face transport chute from the transport main tunnel to the 2# working face coal mining channel and becomes the exhausted air. The exhausted air passes through the 2# working face return air chute, the 1# working face coal mining channel and the 1# working face return air chute to reach the return air main tunnel. The paste filling pipeline is laid in the tunnel through which the exhausted air flows. The coal mined from the 2# working face coal mining channel is transported to the transport main tunnel via the 2# working face transport chute.

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