Method for stoping and filling coal pillars in working face section before mining of coal mine

Abstract

The invention provides a coal mine pre-mining working face section coal pillar stoping and filling method, and belongs to the technical field of coal mining and filling. The technical problems of coal pillar leaving, resource waste and potential safety hazards in traditional mining are solved. According to the technical scheme, the working face section coal pillar stoping and filling method before coal mine mining comprises the following steps that S1, a first to-be-mined working face, a second to-be-mined working face and working face section coal pillars are planned, and the working face section coal pillars are divided into combination areas in sequence; s2, coal resources in the combined area G1 are subjected to stoping, and the coal pillar area is filled with a filling material; and S3, the step S2 is repeated, and coal resources of the follow-up combination areas G2, G3,..., Gn are sequentially recovered and filled. The method has the beneficial effects that coal pillar recovery and working face roadway tunneling are cooperatively carried out, coal-based solid waste resource treatment is achieved while coal pillars are safely recovered, the method has the advantages of being safe, efficient, environmentally friendly and economical, and a sustainable mining solution is provided for a mine.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mining and filling, and in particular to a method for recovering and filling coal pillars in a working face section before coal mining. Background Art

[0002] Traditional coal mining methods can leave behind coal pillars, leading to a waste of coal resources. Because these pillars are flanked by goaf, they often accumulate significant stress, develop internal fissures, and have low strength. Ruthless mining can easily lead to sudden instability of the pillars, resulting in roof collapse and even casualties.

[0003] Against the backdrop of highly developed coal resources, 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 the present invention is to overcome the problems in the background technology and provide a method for recovering and filling coal pillars in the working face section before coal mining. The device can not only safely and fully mine coal resources, but also effectively realize the resource utilization of coal-based solid waste.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts a technical solution specifically as follows: a method for recovering and filling coal pillars in a working face section before coal mining, comprising the following steps:

[0006] S1: Plan the coal seam area to be mined into the first working face to be mined, the second working face to be mined, and the working face section coal pillars, and divide the working face section coal pillars into combined areas G1, G2, G3, ..., Gn in sequence;

[0007] S2, divide the combined area G1 into the section transport lane area, the section return air lane area, the connecting lane area and the coal pillar area, and then divide the coal pillar area into T along the direction of the mining area transport lane area. i strips, where i≥4, the coal resources in the combined area G1 are mined using continuous mining and filling technology and the coal pillar area is filled with filling materials;

[0008] S3. Repeat the above step S2 to mine and fill the coal resources of the subsequent combined areas G2, G3, ... Gn in sequence until the coal pillar mining of the working face section is completed and all coal pillar areas are filled.

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

[0010] S2.1. First, strip T1 is mined. Excavation is carried out from the transport tunnel area to the connecting tunnel area. The mined coal is transported out via a belt conveyor located in the transport tunnel area 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 described in step S2.1. Simultaneously, a closed wall is constructed near the entrance of strip T1, near the transport tunnel in the mining area, and filling equipment and a filling material delivery pipeline are arranged. Gangue cementing material is used to fill the excavated strip T1 to form a support structure.

[0012] S2.3. After strip T3 is excavated, the mining equipment is withdrawn and the section transport tunnel area is mined using the method described in step S2.1. Simultaneously, a closed wall is constructed near the entrance of strip T3, near the mining section transport tunnel area, and filling equipment and filling material delivery 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 tunnel area is excavated, the mining equipment is withdrawn and strip T4 is mined using the method in step S2.1;

[0014] S2.5. After strip T4 is excavated, withdraw the mining equipment and mine the section roadway area T2 using the method described in step S2.1. Simultaneously, construct a closed wall near the entrance of strip T4, close to the mining area's transport tunnel, and arrange filling equipment and filling material delivery pipelines. Use waste rock cementing material to fill the excavated strip T4 to form a support structure.

[0015] S2.6. After strip T2 is excavated, withdraw the mining equipment and mine the section return airway area 3 using the method described in step S2.1. Simultaneously, construct a closed wall near the entrance of strip T2, close to the mining area's transport tunnel, and arrange filling equipment and filling material delivery pipelines. Use waste rock cementing material to fill the excavated strip T2 to form a support structure.

[0016] S2.7. After the section return air tunnel area is excavated, the mining equipment is withdrawn and the connecting tunnel area is mined. Excavation is carried out from the section transport tunnel area to the section return air tunnel area. The mined coal is transported out through the belt conveyor arranged in the section transport tunnel area until it is excavated out of the connecting tunnel area.

[0017] Furthermore, in step S1, the length of the coal pillar in the working face section along the planned 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] Furthermore, in step S2, the mass ratio of the filling materials is: fly ash is 36-47%, coal gangue is 40-50%, accelerating agent is 12.5-16.5% and slurry concentration is 70-80%.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a method for recovering and filling coal pillars in a working face section before coal mining. First, the mined coal seam is planned to include a working face area and several combined areas consisting of coal pillar areas and section roadway areas along the working face advancement direction. The coal pillar areas in each combined area are divided into multiple strips. Then, a continuous mining and continuous filling process is adopted to recover and fill the coal pillar areas in the combined area in a specific order. The filling material is prepared with coal gangue and fly ash as core raw materials, thereby realizing 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. The present invention is practical, simple to operate, and has high value for promotion and application. It realizes safe mining under conditions of no stress concentration in the coal pillar, improves the recovery rate of coal resources on the basis of ensuring safety, and at the same time completes the excavation of the working face tunnel, improves the production efficiency of the coal mine, and brings good economic benefits to the mine; the raw materials of 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, can effectively solve the problem of solid waste resource disposal, and bring good economic and environmental benefits to the mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0024] Figure 1 Schematic diagram of coal pillar area division.

[0025] Among them, the accompanying drawings are marked as: 1. Mining area transport tunnel area; 2. Section transport tunnel area; 3. Section return air tunnel area; 4. Connecting tunnel area; 5. Working face to be mined one; 6. Working face to be mined two; 7. Coal pillar area; 8. Working face section coal pillar. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Example

[0028] like Figure 1As shown, this embodiment provides a method for recovering and filling coal pillars in a working face section before coal mining, comprising the following steps:

[0029] S1: Plan the coal seam area to be mined into the first working face 5 to be mined, the second working face 6 to be mined and the working face section coal pillar 8, and divide the working face section coal pillar 8 into combination areas G1, G2, G3, ... Gn in sequence.

[0030] S2. Divide the combined area G1 into the section transport tunnel area 2, the section return air tunnel area 3, the connecting tunnel area 4, and the coal pillar area 7. Then, divide the coal pillar area 7 into four strips T1, T2, T3, and T4 in the direction of the mining area transport tunnel area 1. The width of each strip is between 3 and 5 meters. Finally, coal is mined and filled in the coal pillar area 7 using a continuous miner and a conveying pipeline. The mass ratio of the filling material is in the range of: fly ash is 35-45%, coal gangue is 40.5-50.5%, and accelerator is 12.5-16.5%. The slurry concentration is 70-80%. The specific mining and filling steps in the combined area are as follows:

[0031] S2.1. First, mine strip T1. Tunneling is carried out from the side of the transport tunnel area 1 in the mining area toward the side of the connecting tunnel area 4. The mined coal is transported out via the belt conveyor arranged in the transport tunnel area 1 in the mining area 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 described in step S2.1. Simultaneously, a closed wall is constructed at the entrance of strip T1, near the side of the mining area's transport tunnel area 1. Filling equipment and a filling material delivery pipeline are arranged, and the excavated strip T1 is filled with waste rock cementing material to form a support structure.

[0033] S2.3. After strip T3 is excavated, the mining equipment is withdrawn and the section transport tunnel area 2 is mined using the method described in step S2.1. Simultaneously, a closed wall is constructed near the entrance of strip T3, near the side of the mining section transport tunnel area 1, and filling equipment and filling material delivery 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 tunnel area 2 is excavated, the mining equipment is withdrawn and strip T4 is mined using the method in step S2.1;

[0035] S2.5. After strip T4 is excavated, withdraw the mining equipment and mine the section tunnel area T2 using the method described in step S2.1. Simultaneously, construct a closed wall at the entrance of strip T4 near the side of the mining area transport tunnel area 1, arrange filling equipment and filling material delivery pipelines, and fill the excavated strip T4 with waste rock cementing material to form a support structure.

[0036] S2.6. After strip T2 is excavated, withdraw the mining equipment and mine the section return air lane area 3 using the method described in step S2.1. Simultaneously, construct a closed wall at the entrance of strip T2 near the side of the mining area transport lane area 1, arrange filling equipment and filling material delivery pipelines, and fill the excavated strip T2 with waste rock cementing material to form a support structure.

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

[0038] S3. Repeat the above step S2, and sequentially mine and fill the coal resources of the subsequent combined areas G2, G3, ... Gn, until the mining of the coal pillar 8 in the working face section is completed and all the 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 in the scope of protection of the present invention.

Claims

1. A method for recovering and filling coal pillars in a working face section before coal mining, characterized in that: The steps include: S1: Plan the coal seam area to be mined into the first working face to be mined (5), the second working face to be mined (6) and the working face section coal pillar (8), and divide the working face section coal pillar (8) into combination areas G1, G2, G3, ... Gn in sequence; S2, the combined area G1 is divided into the section transport lane area (2), the section return air lane area (3), the connecting lane area (4) and the coal pillar area (7), and then the coal pillar area (7) is divided into T along the direction of the mining area transport lane area (1) i strips, where i≥4, using continuous mining and continuous filling technology to recover the coal resources in the combined area G1 and fill the coal pillar area (7) with filling materials; S3. Repeat the above step S2, and sequentially mine and fill the coal resources of the subsequent combined areas G2, G3, ... Gn, until the mining of the coal pillar (8) in the working face section is completed and all coal pillar areas (7) are filled.

2. A method for recovering and filling coal pillars in a coal mine working face section before mining according to claim 1, characterized in that: In step S2, i=4 is selected, that is, the coal pillar area (7) is divided into four strips T1, T2, T3, and T4 in sequence along the direction of the mining area transportation tunnel area (1). The specific mining and filling steps in the combined area G1 are: S2.

1. First, strip T1 is mined, and excavation is carried out from the side of the mining area transport tunnel area (1) to the side of the connecting tunnel area (4). The mined coal is transported out through the belt conveyor arranged in the mining area transport tunnel area (1) until strip T1 is excavated out; S2.

2. After strip T1 is excavated, the mining equipment is withdrawn and strip T3 is mined using the method in step S2.

1. At the same time, a closed wall is constructed at the entrance of strip T1 near the mining area transport tunnel area (1), and filling equipment and filling material delivery pipelines are arranged. Gangue cementing material is used to fill the excavated strip T1 to form a support structure; S2.

3. After strip T3 is excavated, the mining equipment is withdrawn and the section transport tunnel area (2) is mined using the method in step S2.

1. At the same time, a closed wall is constructed at the entrance of strip T3 near the side of the mining section transport tunnel area (1), and filling equipment and filling material delivery pipelines are arranged. Gangue cementing material is used to fill the excavated strip T3 to form a support structure. S2.

4. After the section transport tunnel area (2) is excavated, the mining equipment is withdrawn and strip T4 is mined using the method in step S2.1; S2.

5. After strip T4 is excavated, the mining equipment is withdrawn and the section roadway area T2 is mined using the method in step S2.

1. At the same time, a closed 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 delivery pipelines are arranged. Gangue cementing material is used to fill the excavated strip T4 to form a support structure. S2.

6. After strip T2 is excavated, the mining equipment is withdrawn and the section return air lane area (3) is mined using the method in step S2.

1. At the same time, a closed wall is constructed near the mining area transport lane area (1) at the entrance of strip T2 and filling equipment and filling material delivery pipelines are arranged. Gangue cementing material is used to fill the excavated strip T2 to form a support structure. S2.

7. After the section return air tunnel area (3) is excavated, the mining equipment is withdrawn and the connecting tunnel area (4) is mined. Excavation is carried out from the section transport tunnel area (2) to the section return air tunnel area (3). The mined coal is transported out by the belt conveyor arranged in the section transport tunnel area (2) until the connecting tunnel area (4) is excavated.

3. A method for recovering and filling coal pillars in a coal mine working face section before mining according to claim 1, characterized in that: In step S1, the length of the coal pillar (8) in the working face section along the intended advancing direction of the working face is between 150 and 350 meters.

4. A method for recovering and filling coal pillars in a coal mine working face section before mining according to claim 1, characterized in that: In step S2, the width of each strip is between 3 and 5 meters.

5. A method for recovering and filling coal pillars in a working face section before coal mining according to claim 1, characterized in that: In step S2, the mass ratio of the filling materials is: fly ash is 36-47%, coal gangue is 40-50%, accelerating agent is 12.5-16.5% and slurry concentration is 70-80%.

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