A method for mining a section coal pillar of a working face of a coal mine before mining

Abstract

The application provides a coal pillar recovery and filling method for a section of a working face before mining, and belongs to the technical field of coal mining and filling. The technical problems of coal pillar reservation, resource waste and safety hazards in traditional mining are solved. The technical scheme is as follows: a coal pillar recovery and filling method for a section of a working face before mining, comprising the following steps: S1, planning a to-be-mined working face one, a to-be-mined working face two and a working face section coal pillar, and sequentially dividing and combining the working face section coal pillar into areas; S2, recovering the coal resources in the combined area G1 and filling the coal pillar area with filling materials; S3, repeating the above step S2 to sequentially recover the coal resources in subsequent combined areas G2, G3,..., Gn and fill them. The beneficial effects of the application are as follows: the method cooperatively recovers the coal pillar and excavates the working face roadway, safely recovers the coal pillar, realizes coal-based solid waste resource disposal, has the advantages of safety, high efficiency, environmental protection and economy, and provides a sustainable mining solution for the mine.

Description

Technical Field

[0001] This invention relates to the field of coal mining and backfilling technology, and in particular to a method for backfilling coal pillars in pre-mining working faces of coal mines. Background Technology

[0002] Traditional coal mining methods often result in the creation of coal pillars, leading to a waste of coal resources. Because these pillars are located between goaf areas, they often accumulate significant stress, develop internal fissures, and have low stability. Reckless mining can easily cause sudden instability of the pillar, leading to roof collapse and even casualties.

[0003] Against the backdrop of the extensive development of coal resources, the efficient resource utilization of coal-based solid waste has become a challenge that the industry urgently needs to overcome. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems in the prior art and provide a method for backfilling coal pillars in the pre-mining working face of a coal mine. This device can not only safely and fully mine coal resources, but also effectively realize the resource utilization of coal-based solid waste.

[0005] To achieve the aforementioned objectives, the present invention employs the following technical solution: a method for backfilling and mining coal pillars in a pre-mining working face section of a coal mine, comprising the following steps:

[0006] S1: The coal seam area to be mined is planned into working face 1, working face 2, and working face section coal pillars. The working face section coal pillars are then divided into combined regions G1, G2, G3, ... Gn in sequence.

[0007] S2. Divide the combined area G1 into the section transport roadway area, the section return air roadway area, the connecting roadway area, and the coal pillar area. Then, divide the coal pillar area into T sections along the direction of the mining area transport roadway area. i There are 4 strips, where i≥4. The coal resources in the combined area G1 are mined using the continuous mining and filling process, and the coal pillar area is filled with filling material.

[0008] S3. Repeat step S2 above, and sequentially mine and backfill the coal resources of the subsequent combination areas G2, G3, ... Gn until the coal pillar mining of the working face section is completed and all coal pillar areas are backfilled.

[0009] Further, in step S2, i=4 is selected, that is, the coal pillar area is divided into four strips T1, T2, T3, and T4 along the direction of the mining area transport roadway. The specific mining and filling steps in the combined area G1 are as follows:

[0010] S2.1 First, mine strip T1, and excavate from one side of the mining area transport roadway to the other side of the connecting roadway. The mined coal is transported out by belt conveyors arranged in the mining area transport roadway until strip T1 is excavated.

[0011] S2.2 After strip T1 is excavated, the mining equipment is removed, and strip T3 is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T1 near the mining area transport roadway, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T1 to form a support structure.

[0012] S2.3 After the excavation of strip T3, the mining equipment is removed, and the section transport roadway area is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T3 near the side of the mining area transport roadway, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T3 to form a support structure.

[0013] S2.4 After the section transport roadway area is excavated, the mining equipment is removed, and the strip T4 is mined using the method in step S2.1;

[0014] S2.5 After strip T4 is excavated, the mining equipment is removed, and the section roadway area T2 is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T4 near the mining area transport roadway, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T4 to form a support structure.

[0015] S2.6 After strip T2 is excavated, the mining equipment is removed, and the return airway area 3 of the mining section is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T2 near the mining area transport roadway area, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T2 to form a support structure.

[0016] S2.7 After the section return airway area is excavated, the mining equipment is withdrawn, and the connecting roadway area is mined. The excavation proceeds from the section transport roadway area to the section return airway area. The mined coal is transported out by belt conveyors arranged in the section transport roadway area until the connecting roadway area is excavated.

[0017] Furthermore, in step S1, the length of the coal pillar in the working face section along the intended advancing direction of the working face is between 150 and 350 meters.

[0018] Furthermore, in step S2, the width of each strip is between 3 and 5 meters.

[0019] Further, in step S2, the mass ratio of the filling material is: 36-47% fly ash, 40-50% coal gangue, 12.5-16.5% quick-setting agent, and slurry concentration of 70-80%.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention provides a method for backfilling and mining coal pillars in pre-mining coal mine working faces. First, the coal seam is planned into a working face area and several combined areas along the working face advance direction, consisting of coal pillar areas and section roadway areas. Within each combined area, the coal pillar area is divided into multiple strips. Then, a continuous mining and backfilling process is used to backfill and fill the coal pillar areas within the combined areas in a specific sequence. The backfilling material is prepared using coal gangue and fly ash as core raw materials, achieving safe and full mining of coal resources and resource utilization of coal-based solid waste, bringing environmental and economic benefits to the mine.

[0022] 2. This invention is practical, simple to operate, and has high application value. It enables safe mining under stress-free conditions of coal pillars, improves the coal extraction rate while ensuring safety, and simultaneously completes the excavation of working face roadways, thereby improving coal mine production efficiency and bringing good economic benefits to the mine. The raw materials for the filling material are mainly coal-based solid waste materials such as fly ash and coal gangue, which can consume mine solid waste materials on-site, effectively solving the problem of solid waste resource disposal and bringing good economic and environmental benefits to the mine. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0024] Figure 1 This is a schematic diagram showing the division of coal pillar areas.

[0025] The attached diagram is labeled as follows: 1. Mining area transport roadway area; 2. Section transport roadway area; 3. Section return air roadway area; 4. Connecting roadway area; 5. Working face 1 to be mined; 6. Working face 2 to be mined; 7. Coal pillar area; 8. Working face section coal pillar. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] Example

[0028] like Figure 1As shown in the figure, this embodiment provides a method for backfilling and mining coal pillars in a pre-mining working face section of a coal mine, including the following steps:

[0029] S1: The coal seam area to be mined is planned into working face 1 (5), working face 2 (6), and coal pillar of working face section (8). The coal pillar of working face section (8) is then divided into combined areas G1, G2, G3, ... Gn.

[0030] S2. Divide the combined area G1 into section transport roadway area 2, section return air roadway area 3, connecting roadway area 4, and coal pillar area 7. Then, divide the coal pillar area 7 into four strips T1, T2, T3, and T4 along the direction of the mining area transport roadway area 1. The width of each strip is between 3 and 5 meters. Finally, coal mining and filling of coal pillar area 7 are carried out through continuous miners and conveying pipelines. The mass ratio of the filling material is as follows: fly ash 35-45%, coal gangue 40.5-50.5%, quick-setting agent 12.5-16.5%, and slurry concentration 70-80%. The specific mining and filling steps within the combined area are as follows:

[0031] S2.1 First, mine strip T1, and excavate from one side of the mining area transport roadway area 1 to the other side of the connecting roadway area 4. The mined coal is transported out by belt conveyor arranged in the mining area transport roadway area 1 until strip T1 is excavated.

[0032] S2.2 After strip T1 is excavated, the mining equipment is removed, and strip T3 is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T1 near the side of the mining area transport roadway 1, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T1 to form a support structure.

[0033] S2.3 After the strip T3 is excavated, the mining equipment is removed, and the section transport roadway area 2 is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T3 near the side of the mining area transport roadway area 1, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T3 to form a support structure.

[0034] S2.4 After the section transport roadway area 2 is excavated, the mining equipment is removed, and the strip T4 is mined using the method in step S2.1;

[0035] S2.5 After strip T4 is excavated, the mining equipment is removed, and the section roadway area T2 is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T4 near the side of the mining area transport roadway area 1, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T4 to form a support structure.

[0036] S2.6 After strip T2 is excavated, the mining equipment is removed, and the return airway area 3 of the mining section is mined using the method in step S2.1. At the same time, a sealed wall is constructed at the entrance of strip T2 near the mining area transport roadway area 1, and filling equipment and filling material conveying pipelines are arranged. Gangue cementing material is used to fill the excavated strip T2 to form a support structure.

[0037] S2.7 After the section return airway area 3 is excavated, the mining equipment is withdrawn, and the connecting roadway area 4 is mined. The mining is carried out from the side of the section transport roadway area 2 to the side of the section return airway area 3. The mined coal is transported out by the belt conveyor arranged in the section transport roadway area 2 until the connecting roadway area 4 is excavated.

[0038] S3. Repeat step S2 above, and sequentially mine and fill the coal resources of the subsequent combination areas G2, G3, ... Gn until the coal pillar 8 of the working face section is mined and all coal pillar areas 7 are filled.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for backfilling and mining coal pillars in a pre-mining working face section of a coal mine, characterized in that, Includes the following steps: S1: The coal seam area to be mined is planned into working face 1 (5), working face 2 (6) and working face section coal pillar (8), and the working face section coal pillar (8) is divided into combined areas G1, G2, G3, ... Gn in sequence; S2. Divide the combined area G1 into the section transport roadway area (2), the section return air roadway area (3), the connecting roadway area (4), and the coal pillar area (7). Then, divide the coal pillar area (7) into T sections along the direction of the mining area transport roadway area (1). i A strip, i=4, is used to mine the coal resources in the combined area G1 using the continuous mining and filling process and fill the coal pillar area (7) with filling material; S3. Repeat step S2 above, and mine and fill the coal resources of subsequent combination areas G2, G3, ... Gn in sequence until the coal pillar (8) of the working face section is mined and all coal pillar areas (7) are filled. In step S2, i=4 is selected, that is, the coal pillar area (7) is divided into four strips T1, T2, T3, and T4 along the direction of the mining area transport roadway area (1). The specific mining and filling steps in the combined area G1 are as follows: S2.1 First, mine strip T1, and excavate from one side of the mining area transport roadway (1) to the side of the connecting roadway (4). The mined coal is transported out by the belt conveyor arranged in the mining area transport roadway (1) until strip T1 is excavated. S2.2 After strip T1 is excavated, the mining equipment is removed, and strip T3 is mined using the method in step S2.

1. At the same time, a sealed wall is constructed on the side of the mining area transport roadway (1) near the entrance of strip T1, and filling equipment and filling material conveying pipeline are arranged. Gangue cementing material is used to fill the excavated strip T1 to form a support structure. S2.3 After the strip T3 is excavated, the mining equipment is removed, and the section transport roadway area (2) is mined using the method in step S2.

1. At the same time, a sealed wall is constructed on the side of the strip T3 entrance near the mining area transport roadway area (1), and filling equipment and filling material conveying pipeline are arranged. Gangue cementing material is used to fill the excavated strip T3 to form a support structure. S2.4 After the section transport roadway area (2) is excavated, the mining equipment is removed, and the strip T4 is mined using the method in step S2.1; S2.5 After the strip T4 is excavated, the mining equipment is removed, and the section roadway area T2 is mined using the method in step S2.

1. At the same time, a sealed wall is constructed at the entrance of strip T4 near the mining area transport roadway area (1), and filling equipment and filling material conveying pipeline are arranged. Gangue cementing material is used to fill the excavated strip T4 to form a support structure. S2.6 After the strip T2 is excavated, the mining equipment is removed and the return airway area (3) of the mining section is mined using the method in step S2.

1. At the same time, a sealed wall is constructed on the side of the strip T2 entrance near the mining area transport roadway area (1) and filling equipment and filling material conveying pipeline are arranged. Gangue cementing material is used to fill the excavated strip T2 to form a support structure. S2.7 After the section return airway area (3) is excavated, the mining equipment is removed and the connecting roadway area (4) is mined. The mining is carried out from the side of the section transport roadway area (2) to the side of the section return airway area (3). The mined coal is transported out by the belt conveyor arranged in the section transport roadway area (2) until the connecting roadway area (4) is excavated.

2. The method for backfilling and mining coal pillars in a pre-mining working face section of a coal mine according to claim 1, characterized in that, In step S1, the length of the coal pillar (8) in the working face section along the proposed advancing direction of the working face is between 150 and 350 meters.

3. The method for backfilling and mining coal pillars in a pre-mining working face section of a coal mine according to claim 1, characterized in that, In step S2, the width of each strip is between 3 and 5 meters.

4. A method for backfilling and mining coal pillars in a pre-mining working face of a coal mine according to claim 1, characterized in that, In step S2, the mass ratio of the filling material is: 36-47% fly ash, 40-50% coal gangue, 12.5-16.5% quick-setting agent, and slurry concentration of 70-80%.

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