Fully-mechanized coal mining face and fully-mechanized coal mining frame post-filling process

Abstract

The fully mechanized mining face provided by the embodiment of the invention adopts three-roadway arrangement to realize comprehensive mechanized segmented mining and filling, a filling working face is divided into two section working faces which are arranged at an interval, and filling pipelines and related filling equipment, such as filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports, filling hydraulic supports and filling hydraulic supports are respectively arranged on the filling working face. A forward coal mining technology is adopted, and automatic roadway forming is achieved. A middle roadway between the working faces of the two sections is a transportation roadway and is provided with a working face transportation crossheading, a belt and a continuous transportation system are arranged in the working face transportation crossheading, and coal mining is carried out on working face coal falling by adopting a digging and mining all-in-one machine matched with a continuous transportation belt. In the production process, the working faces of the two sections sequentially work at intervals, effective connection of the working procedures of coal mining, filling and hardening is achieved, a filling body has sufficient time to harden, normal production continuity of the working faces is guaranteed, working face idling is avoided, and therefore the production efficiency of the working faces is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mines, in particular to a fully mechanized mining working face and a fully mechanized mining frame back-filling process. Background Art

[0002] More than 90% of my country's coal mines are mined by underground caving method. The eastern and central regions are densely populated, and coal resources were developed early. There are a large number of buildings that are mainly used to compress coal. The average recovery rate of coal resources is only 30%-40%. More and more coal companies are facing the problem of "three down" mining. For this part of the "three down" compressed coal, the continuous mining and filling process or the full-mechanized mining frame back-filling method is currently used for backfilling mining. Due to its own characteristics, the continuous mining and filling process generally does not exceed 600,000 tons / year, and the production efficiency is low; and the full-mechanized mining frame back-filling, although the mining degree is high and the coal output is large, but due to the current technical equipment limitations, its maximum mining height generally does not exceed 4.5m, and there are problems such as the filling body is difficult to fully connect to the top, the surface subsidence control effect is poor, and the hardening speed of the filling body restricts the production efficiency. Therefore, in the application of coal mine backfilling mining, the above two processes have different forms of problems, which restricts the promotion and application of backfilling mining. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a fully mechanized mining face.

[0004] The embodiment of the present invention also provides a post-filling process for a fully mechanized mining frame.

[0005] The fully mechanized mining working face of the embodiment of the present invention comprises: a first section working face and a second section working face, wherein the first section working face and the second section working face are spaced apart in a first direction; a working face transport chute, wherein the working face transport chute is arranged in the interval between the first section working face and the second section working face, and the extension direction of the working face transport chute extends along the second direction, and the first direction is orthogonal to the second direction; a transport main lane, wherein the transport main lane is arranged on one side of the first section working face and the second section working face in the second direction, the transport lane extends along the first direction, and the working face transport chute is connected with the transport main lane; a mining machine, wherein the mining machine is arranged on the other side of the first section working face and the second section working face opposite to the transport main lane, and the mining machine is used for mining coal on the first section working face and the second section working face; a first filling pipeline and a second filling pipeline, wherein the terminal of the first filling pipeline is arranged on the mining side of the first section working face, and the terminal of the second filling pipeline is arranged on the mining side of the second section working face.

[0006] The fully mechanized mining face provided by the embodiment of the present invention adopts a three-lane layout to realize comprehensive mechanized segmented mining and filling. The filling face is divided into two section working faces arranged at intervals, and filling pipelines and related filling equipment, such as filling hydraulic supports, are arranged respectively. The forward coal mining process is adopted to automatically form a lane. The middle lane between the two section working faces is a transportation lane, which is provided with a working face transportation chute. The belt and continuous transportation system are arranged in the working face transportation chute. The coal falling of the working face adopts a continuous transportation belt equipped with a mining and excavation integrated machine for coal mining. During the production process, the two section working faces are operated in sequence at intervals to realize the effective connection of the "coal mining-filling-hardening" process, so that the filling body has sufficient time to harden, ensure the normal production of the working face, avoid idle work on the working face, thereby greatly improving the production efficiency of the working face, and the filling body is fully connected to the top, ensuring the surface settlement control effect. It has played a positive role in improving the technical level of "three-down" coal mining in my country, improving the recovery rate of coal resources and mining efficiency.

[0007] In addition, the technology of retaining lanes along the goaf is adopted in the filling production process, and the isolation coal pillars between the working faces are eliminated during the entire coal seam mining, which greatly improves the resource recovery rate while reducing a series of disasters such as mine pressure manifestation, impact ground pressure, and coal seam spontaneous combustion.

[0008] In some embodiments, a first filling pipeline tunnel is provided on the side of the first section working surface away from the second section working surface in the first direction, and the first filling pipeline passes through the first filling pipeline tunnel; a second filling pipeline tunnel is provided on the side of the second section working surface away from the first section working surface in the first direction, and the second filling pipeline passes through the second filling pipeline tunnel.

[0009] In some embodiments, the comprehensive mining working face also includes an auxiliary transport main tunnel, which is parallel to the transport main tunnel, the first filling pipeline tunnel and the second filling pipeline tunnel are both connected to the auxiliary transport main tunnel, and the first filling pipeline and the second filling pipeline both pass through the auxiliary transport main tunnel.

[0010] In some embodiments, a working face auxiliary transport chute is provided in the second filling pipeline tunnel, and the working face auxiliary transport chute is used for auxiliary transportation.

[0011] In some embodiments, the comprehensive mining working face also includes a return air main tunnel, which is parallel to the transport main tunnel, and the first filling pipeline tunnel is connected to the return air main tunnel, and the first filling pipeline tunnel serves as a return air chute for the working face to return air.

[0012] In some embodiments, the comprehensive mining working face also includes a continuous transportation system, which is arranged on the mining side of the first section working face and the second section working face, and the continuous transportation system is used to transport the coal blocks mined by the mining machine to the working face transportation chute.

[0013] In some embodiments, the mining machine mines the first section working face and the second section working face alternately.

[0014] In some embodiments, the comprehensive mining working face also includes a first retaining wall support and a second retaining wall support, the first retaining wall support is arranged on at least one side of the first section working face in the first direction, and the second retaining wall support is arranged on at least one side of the second section working face in the second direction.

[0015] Another embodiment of the present invention provides another post-filling process of a fully mechanized mining frame, characterized in that the post-filling process of the fully mechanized mining frame is performed on a fully mechanized mining working face, and the fully mechanized mining working face is the fully mechanized mining working face according to any one of the above embodiments, and the post-filling process of the fully mechanized mining frame includes:

[0016] The mining machine operates to mine coal on one of the first section working face and the second section working face;

[0017] The filling pipeline performs paste filling on one of the first section working face and the second section working face after coal mining;

[0018] While waiting for the filling paste of one of the first section working face and the second section working face to harden, coal mining is performed on the other of the first section working face and the second section working face.

[0019] In some embodiments, during the process of performing paste filling on one of the first section working face and the second section working face after coal mining, coal mining is started on the other of the first section working face and the second section working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a fully mechanized mining face provided in an embodiment of the present invention.

[0021] Reference numerals:

[0022] The first section working surface 1, the first filling body 11, the first filling pipeline tunnel 12, the first retaining wall support 13,

[0023] The second section working surface 2, the second filling body 21, the second filling pipeline tunnel 22, the second retaining wall support 23, the filling support 24,

[0024] Working face transport chute 3,

[0025] Transport main lane 4, belt 41,

[0026] Mining machine 5.

[0027] The first filling pipeline 6, the second filling pipeline 7,

[0028] Auxiliary transport lane 8, return air lane 9,

[0029] Continuous transport system10. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0031] In view of the problems existing in the paste filling process behind the fully mechanized mining frame, the embodiment of the present invention proposes a fully mechanized mining face and a fully mechanized mining frame back filling process. Figure 1 The fully mechanized mining working face provided by an embodiment of the present invention is described.

[0032] like Figure 1 As shown, the comprehensive mining working face includes a first section working face 1, a second section working face 2, a working face transport drift 3, a transport main tunnel 4, a mining machine 5, a first filling pipeline 6 and a second filling pipeline 7.

[0033] The first section working face 1 and the second section working face 2 are arranged at intervals in the first direction. The working face transport chute 3 is arranged in the interval between the first section working face 1 and the second section working face 2, and the extension direction of the working face transport chute 2 extends along the second direction, wherein the first direction is orthogonal to the second direction. The first section working face 1 and the second section working face 2 both have two opposite sides in the second direction, wherein the side for mining is the mining side. For example Figure 1 As shown, the right side of the first section working face 1 and the right side of the second section face 2 are mining sides.

[0034] The transport tunnel 4 is arranged on one side of the first section working surface 1 and the second section working surface 2 in the second direction ( Figure 1 The transport lane 4 extends in the first direction, and the working face transport chute 3 is connected with the transport lane 4. The working face transport groove is used to transport the coal blocks collected from the first section working face 1 and the second section working face 2. The coal blocks are transported to the transport lane 4 along the working face transport chute and transported to the transport lane 4 along the belt 41 in the transport lane 4 to the exit.

[0035] The excavator 5 is arranged on the other side of the first section working face 1 and the second section working face 2 opposite to the transport tunnel 4 ( Figure 1 The mining machine 5 is used to mine coal on the first section working face 1 and the second section working face 2. Figure 1 As shown, the right side of the first section working face 1 and the right side of the second section working face 2 are mining sides, and the mining machine 5 is located on the right side of the first section working face 1 when mining the first section working face 1, and is located on the right side of the second section working face 2 when mining the second section working face 2. The mining of the first section working face 1 and the second section working face 2 is carried out in a direction away from the main transport tunnel 4, that is, from left to right.

[0036] The first filling pipeline 6 and the second filling pipeline 7, the terminal of the first filling pipeline 6 is set on the mining side (right side) of the first section working face 1, and the terminal of the second filling pipeline 7 is set on the mining side (right side) of the second section working face 2. The first filling pipeline 6 is used to fill and reinforce the space after the mining of the first section working face 1, and the second filling pipeline 7 is used to fill and reinforce the space after the mining of the second section working face 1. Figure 1 As shown, the first section working face 1 forms a first filling body 11 after filling and hardening on the left side of the mining side, and the second section working face 2 forms a second filling body 21 after filling and hardening on the left side of the mining side.

[0037] The fully mechanized mining face provided by the embodiment of the present invention adopts a three-lane layout to realize comprehensive mechanized segmented mining and filling. The filling face is divided into two section working faces arranged at intervals, and filling pipelines and related filling equipment, such as filling hydraulic supports, are arranged respectively. The forward coal mining process is adopted to automatically form a lane. The middle lane between the two section working faces is a transport lane, which is provided with a working face transport chute. The belt and continuous transportation system are arranged in the working face transport chute. The coal falling of the working face adopts a continuous transportation belt equipped with a mining machine for coal mining. During the production process, the two section working faces are operated in sequence at intervals to realize the effective connection of the "coal mining-filling-hardening" process, so that the filling body has sufficient time to harden, ensure the normal production continuity of the working face, avoid idle work on the working face, thereby greatly improving the production efficiency of the working face, and the filling body is fully connected to the top, ensuring the surface settlement control effect. It has played a positive role in improving the technical level of "three-down" coal mining in my country, improving the recovery rate of coal resources and mining efficiency.

[0038] In addition, the technology of retaining lanes along the goaf is adopted in the filling production process, and the isolation coal pillars between the working faces are eliminated during the entire coal seam mining, which greatly improves the resource recovery rate while reducing a series of disasters such as mine pressure manifestation, impact ground pressure, and coal seam spontaneous combustion.

[0039] In some embodiments, Figure 1 As shown, the first section working surface 1 is on one side away from the second section working surface 2 in the first direction ( Figure 1 A first filling pipeline lane 12 is provided on the upper side of the filling pipeline lane 12, and the first filling pipeline lane 12 is arranged along the second direction ( Figure 1The first filling pipeline 6 passes through the first filling pipeline tunnel 12, that is, the first filling pipeline 6 is arranged in the first filling pipeline tunnel 12, and the terminal of the first filling pipeline 6 extends rightward into the mining side of the first section working face 1. The second section working face 2 is provided with a second filling pipeline tunnel 22 on the side away from the first section working face 1 in the first direction, and the second filling pipeline tunnel 222 extends along the second direction ( Figure 1 The second filling pipeline 7 extends in the left and right directions, and passes through the second filling pipeline tunnel 22, that is, the second filling pipeline 7 is arranged in the second filling pipeline tunnel 22, and the terminal end of the second filling pipeline 7 extends to the right into the mining side of the second section working face 2.

[0040] like Figure 1 As shown, the fully mechanized mining face also includes an auxiliary transportation tunnel 8, which is parallel to the transportation tunnel 4 and extends along the first direction. Figure 1 In the illustrated embodiment, the auxiliary transport lane 8 is located on the right side of the transport lane 4 and is used for auxiliary transport. The first filling pipeline lane 12 and the second filling pipeline lane 22 are both connected to the auxiliary transport lane 8, and the first filling pipeline 6 and the second filling pipeline 7 both pass through the auxiliary transport lane 8, that is, the first filling pipeline 6 passes through the first filling pipeline lane 12 and then leads out through the auxiliary transport lane 8, and the second filling pipeline 7 passes through the second filling pipeline lane 22 and then leads out through the auxiliary transport lane 8. For example, the first filling pipeline 6 and the second filling pipeline 7 are connected to the filling storage device after being led out through the auxiliary transport lane 8, and the filling is filled through the first filling pipeline 6 and the second filling pipeline 7.

[0041] The first filling pipeline tunnel 12, the second filling pipeline tunnel 22 and the working face transport chute 3 are parallel to each other. In some embodiments, a working face auxiliary transport chute is provided in the second filling pipeline tunnel 22, and the working face auxiliary transport chute is used for auxiliary transportation, and a belt and a continuous transportation system can be arranged in the working face auxiliary transport chute. When the working face auxiliary transport chute is working, the working face auxiliary transport chute can be used to transport coal blocks mined from the working face 2 of the second section, and the working face transport chute 3 can be used to transport coal blocks mined from the working face 1 of the first section.

[0042] The fully mechanized mining face also includes a return air tunnel 9, which is parallel to the transport tunnel 4. Figure 1 As shown, the return air main lane 9 is located on the left side of the transport main lane 4. The first filling pipeline lane 12 is connected to the return air main lane 9, and the first filling pipeline lane 12 is used as a return air chute for the working face to return air.

[0043] In some embodiments, the fully mechanized mining face includes a continuous transportation system 10, which is arranged on the mining side of the first section working face 1 and the second section working face 1 ( Figure 1The continuous transport system 10 is used to transport the coal blocks mined by the mining machine 5 to the working face transport chute 3.

[0044] When the mining machine 5 mines the first section working face 1, the continuous transportation system 10 is located on the mining side of the first section working face 1, and the mined coal blocks are transported to the working face transportation chute 3. When the mining machine 5 mines the second section working face 2, the continuous transportation system 10 is located on the mining side of the second section working face 2, and the mined coal blocks are transported to the working face transportation chute 3, or to the working face auxiliary transportation chute in the second filling pipeline tunnel 22.

[0045] The mining machine 5 mines the first section working face 1 and the second section working face 2 alternately, that is, the first section working face 1 and the second section working face 2 are operated in sequence, realizing the effective connection of the "coal mining-filling-hardening" process, so that the filling body has sufficient time to harden, ensuring the normal production continuation of the working face, avoiding idle work on the working face, and thus greatly improving the production efficiency of the working face.

[0046] The comprehensive mining working face further includes a first retaining wall support 13 and a second retaining wall support 23. The first retaining wall support 13 is arranged on at least one side of the first section working face 1 in the first direction, and the first retaining wall support 13 is used to support the filling area of ​​the first section working face 1. The second retaining wall support 23 is arranged on at least one side of the second section working face 2 in the second direction. The second retaining wall support 23 is used to support the filling area of ​​the second section working face 2.

[0047] like Figure 1 As shown, the second section working surface 2 is being filled, and a filling bracket 24 for support is provided on the filling side, and the second retaining wall bracket 23 is provided on two opposite sides of the second section working surface 2 in the first direction, and defines a filling space, and the filling space is filled by the second filling pipeline 7. During the hardening process, the first retaining wall bracket 13 and the second retaining wall bracket 23 also play a key supporting role.

[0048] Another embodiment of the present invention provides a post-filling process for a fully-mechanized mining frame, which is performed on a fully-mechanized mining working face, wherein the fully-mechanized mining working face is the fully-mechanized mining working face described in any one of the above embodiments. The post-filling process for a fully-mechanized mining frame includes:

[0049] The mining machine 5 operates to mine coal on one of the first section working face 1 and the second section working face 2;

[0050] The filling pipeline performs paste filling on one of the first section working face 1 and the second section working face 2 after coal mining, wherein the filling pipeline is the first filling pipeline 6 or the second filling pipeline 7, wherein the first filling pipeline 6 is used to fill the first section working face 1, and the second filling pipeline 7 is used to fill the second section working face 2;

[0051] While waiting for the filling paste of one of the first section working face 1 and the second section working face 2 to harden, coal mining is performed on the other of the first section working face 1 and the second section working face 2 .

[0052] In some embodiments, during the process of filling paste on one of the first section working face 1 and the second section working face 2 after coal mining, coal mining is started on the other of the first section working face 1 and the second section working face 2, so that the coal mining interval between the first section working face 1 and the second section working face 2 can be shortened as much as possible.

[0053] As an example, the mining machine 5 operates to mine coal on the first section working face 1;

[0054] The first filling pipeline 6 fills the first section working face 1 after coal mining with paste, while the mining machine 5 operates to mine coal on the second section working face 2;

[0055] While waiting for the filling paste of the first section working face 1 to harden, coal mining continues on the second section working face 2;

[0056] After the mining of the second section working face 2 is completed and the filling paste of the first section working face 1 is hardened, the mining machine 5 operates to mine coal on the first section working face 1, and the second filling pipeline 7 fills the second section working face 2, and the "coal mining-filling-hardening" process is effectively connected in this reciprocating manner.

[0057] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0061] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0062] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fully mechanized mining working face, characterized in that: include: A first section working surface and a second section working surface, wherein the first section working surface and the second section working surface are spaced apart in a first direction; A working face transport chute, wherein the working face transport chute is arranged in the interval between the working face of the first section and the working face of the second section, and the extending direction of the working face transport chute extends along the second direction, and the first direction is orthogonal to the second direction; A transport main lane, which is arranged on one side of the first section working face and the second section working face in the second direction, the transport lane extends along the first direction, and the working face transport chute is connected to the transport main lane; A mining machine, the mining machine is arranged on the other side of the first section working face and the second section working face opposite to the main transport tunnel, and the mining machine is used to mine coal on the first section working face and the second section working face; A first filling pipeline and a second filling pipeline, wherein the terminal of the first filling pipeline is arranged on the mining side of the working face of the first section, and the terminal of the second filling pipeline is arranged on the mining side of the working face of the second section.

2. The fully mechanized mining face according to claim 1, characterized in that: A first filling pipeline lane is provided on a side of the first section working surface away from the second section working surface in the first direction, and the first filling pipeline passes through the first filling pipeline lane; A second filling pipeline lane is provided on a side of the second section working surface away from the first section working surface in the first direction, and the second filling pipeline passes through the second filling pipeline lane.

3. The fully mechanized mining face according to claim 2 is characterized in that: It also includes an auxiliary transport main lane, which is parallel to the transport main lane, the first filling pipeline lane and the second filling pipeline lane are both connected to the auxiliary transport main lane, and the first filling pipeline and the second filling pipeline both pass through the auxiliary transport main lane.

4. The fully mechanized mining face according to claim 3 is characterized in that: A working face auxiliary transport chute is provided in the second filling pipeline tunnel, and the working face auxiliary transport chute is used for auxiliary transportation.

5. The fully mechanized mining face according to claim 2, characterized in that: It also includes a return air main lane, which is parallel to the transport main lane, and the first filling pipeline lane is connected to the return air main lane, and the first filling pipeline lane serves as a return air chute for the working face to return air.

6. The fully mechanized mining face according to claim 1, characterized in that: It also includes a continuous transportation system, which is arranged on the mining side of the first section working face and the second section working face, and is used to transport the coal blocks mined by the mining machine to the working face transportation chute.

7. The fully mechanized mining face according to claim 1, characterized in that: The mining machine mines the first section working face and the second section working face alternately.

8. The fully mechanized mining face according to claim 1, characterized in that: It also includes a first retaining wall bracket and a second retaining wall bracket, the first retaining wall bracket is arranged on at least one side of the working surface of the first section in the first direction, and the second retaining wall bracket is arranged on at least one side of the working surface of the second section in the second direction.

9. A post-filling process for a fully mechanized mining frame, characterized in that: The post-filling process of the fully mechanized mining frame is performed on a fully mechanized mining working face, and the fully mechanized mining working face is a fully mechanized mining working face according to any one of claims 1 to 8. The post-filling process of the fully mechanized mining frame includes: The mining machine operates to mine coal on one of the first section working face and the second section working face; The filling pipeline performs paste filling on one of the first section working face and the second section working face after coal mining; While waiting for the filling paste of one of the first section working face and the second section working face to harden, coal mining is performed on the other of the first section working face and the second section working face.

10. The post-filling process of the fully mechanized mining frame according to claim 9 is characterized in that: During the process of performing paste filling on one of the first section working face and the second section working face after coal mining, coal mining is started on the other of the first section working face and the second section working face.

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