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Coal-pillar-free mining and gas treatment method for high-gas coal seam

A technology without coal pillars and gas, which is applied in gas discharge, ground mining, mining equipment, etc.

Active Publication Date: 2020-08-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for high-gas coal seam mining without coal pillars and gas control with simple steps and good mining effect.

Method used

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  • Coal-pillar-free mining and gas treatment method for high-gas coal seam
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  • Coal-pillar-free mining and gas treatment method for high-gas coal seam

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Embodiment Construction

[0020] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Such as Figure 1 to Figure 5 Shown, a kind of high gas coal seam non-pillar mining of the present invention and the method for gas control are characterized in that concrete steps are as follows:

[0022] a First excavate the coal lanes on both sides of the working face A as the transport lane, the coal lane as the air inlet lane and the rock lane in the roof as the high extraction lane, and simultaneously excavate the coal lanes on the working face B as the transport lane, each coal lane During the excavation, use the drilling rig to drill bedding holes into the pre-mined coal body at the side of the roadway following the excavation face, and pre-extract the gas in the unmined coal body of the two working faces through the bedding holes to reduce the gas content of the mined coal seam ;

[0023] b After the above-mentioned roadway layout is co...

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Abstract

The invention discloses a coal-pillar-free mining and gas treatment method for a high-gas coal seam. The method is suitable for being used in an underground coal mine. Firstly, mining roadways on thetwo sides of a working face A and a transportation roadway of a working face B are excavated, bedding drill holes are formed in the side portions of the roadways in the excavation period to pre-extract coal seam gas, and open-off cuts of the two working faces are continuously excavated and communicate. At the moment, the working face A belongs to a Y + L type ventilation system, the ventilation amount of the working face is large, gas at the upper corner can be diluted and discharged easily, and the problem of gas accumulation at the upper corner is solved. During stoping of the working face A, an air inlet roadway of the working face A is reserved in a gob-side entry retaining mode, an air return roadway of the working face B is arranged in a head-on entry driving mode, stoping of the working face B is performed after stoping of the working face A, and a W type fully mechanized caving face sequentially replaces a Y + L type fully mechanized caving face. Roadway protection coal pillarsbetween the two working faces are recovered through strip mining during the stoping of the working face B, coal-pillar-free mining is achieved, the mining rate of the mine is effectively increased, and the problem of upper-corner gas treatment in the high-gas working face is solved.

Description

technical field [0001] The invention relates to a method for mining high-gas coal seams without coal pillars and controlling gas, and belongs to the technical field of coal mining. Background technique [0002] Lu'an mining area is rich in coal resource reserves. At present, the 3# coal seam is mainly mined. The average thickness of this coal seam is 5-7m. 3 / t, the permeability is generally less than 0.5×10 -15 m 2 , is a thick coal seam with low permeability and high gas. At present, the 3# coal seam is mainly mined by fully mechanized top-coal caving technology, but it faces the following problems: (1) The absolute gas emission of the coal seam is relatively large during the tunneling, and the tunneling speed is slow due to the influence of the ventilation mode of the single-headed roadway; (2) The working face has high output, fast advancing speed, high mining intensity, and the continuous tension of the working face; (3) A roadway coal pillar with a width of 30-50m i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21F7/00
CPCE21C41/18E21F7/00
Inventor 袁永朱成陈忠顺王文苗陈大广张村王沉朱德福李波王圣志钟慧伟
Owner CHINA UNIV OF MINING & TECH
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