A method for pillar-less mining of high-gas coal seams and gas control

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

Active Publication Date: 2021-07-30
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.

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  • A method for pillar-less mining of high-gas coal seams and gas control
  • A method for pillar-less mining of high-gas coal seams and gas control
  • A method for pillar-less mining of high-gas coal seams and gas control

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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 method for mining high-gas coal seams without coal pillars and controlling gas, which is suitable for underground use in coal mines. First excavate the mining roadways on both sides of the working face A and the transportation roadway of the working face B. During the excavation, drill holes along the side of the roadway to pre-extract coal seam gas, and continue to excavate the cut holes of the two working faces and penetrate them; at this time Working face A belongs to the "Y+L" type ventilation system, and the ventilation volume of the working face is large, which is conducive to diluting and discharging the gas at the upper corner and overcoming the problem of gas accumulation in the upper corner. During the mining of working face A, the air inlet roadway of working face A is kept in the way of gob-side entry, and the air return roadway of working face B is arranged in the way of facing the mining roadway. The laying face sequence replaces the "Y+L" type fully mechanized caving face. During the recovery of the B working face, the coal pillars between the two working faces are recovered by belt mining, which realizes coal pillar-free mining and effectively improves the mine recovery rate. It solves the problem of gas control in the upper corner of the high gas working face.

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 Patents(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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