Drill hole layout method for gas extraction during primary mining and stoping of large mining height fully-mechanized face

A technology for fully mechanized mining face and gas drainage, which is used in gas discharge, safety devices, mining equipment, etc., and can solve the problem of high drilling failure, pressure relief gas flow, and large gas flow in goafs, etc. problems, to achieve the effect of improving the extraction volume and utilization rate, reducing the amount of gas gushing, and ensuring production safety.

Active Publication Date: 2016-01-13
SHANXI JINMEI GRP TECH RESEACH INST +1
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Problems solved by technology

[0002] Gas drainage technology in goafs with high-level drilling is widely used as an effective method to control gas in goafs. However, in the initial stage of mining in fully mechanized mining working faces with large mining heights, the old roof of the coal seam has not been crossed, and

Method used

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  • Drill hole layout method for gas extraction during primary mining and stoping of large mining height fully-mechanized face
  • Drill hole layout method for gas extraction during primary mining and stoping of large mining height fully-mechanized face
  • Drill hole layout method for gas extraction during primary mining and stoping of large mining height fully-mechanized face

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[0031] The roadway layout of fully mechanized mining face with large mining height is as follows: figure 1 As shown, it is generally arranged as a "three-inlet and two-return" ventilation system. The entire coal mining area is composed of five roadways, gas return airways, and cutouts.

[0032] The specific implementation of the low-level drilling: the low-level drilling is relatively short, and ordinary drilling rigs are used to drill holes from the special gas return airway to the roof of the cutout. 6±1m, 30±2m in length, and 10~20m between adjacent low-level drill holes. Such as figure 2 and image 3 shown.

[0033] The specific implementation method of the middle drilling: use the 1000-meter directional drilling machine to construct the middle drilling at the appropriate position in the roadway on the return air side. The hole layers are arranged within the range of 6~25m from the coal seam roof (directly above the roof, below the old roof), and in the lateral direct...

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Abstract

The invention relates to a drill hole layout method for gas extraction during primary mining and stoping of a large mining height fully-mechanized face and mainly aims at solving the problem of transfinite gas during primary mining and stoping of the large mining height fully-mechanized face. A technical scheme of the drill hole layout method is as follows: low-position drill holes are formed in a gas special return airway of the fully-mechanized face mainly for extracting residual coal gas of a primary mining section; aiming at a problem that high-position drill holes do not function during primary mining, medium-position drill holes are formed for extracting goaf gas; aiming at a problem that the gas of adjacent coal seams rushes into the working face during primary mining and stoping of the working face, low adjacent layer gas stopping drill holes are formed and high-position drill holes are formed for extracting the goaf gas during normal stoping of the working face; the goaf gas is extracted orderly and continuously through the low-position holes, the medium-position holes and the high-position holes and the lower adjacent layer decompression gas is extracted through bottom-plate stopping holes; as a result, the gas extraction amount and the utilization rate of the gas are increased; moreover, a gas emission rate of the goaf is reduced; a windblown gas pressure is reduced; an advancing speed of the working face is increased and a coal yield is increased.

Description

technical field [0001] The invention relates to an underground gas drainage drilling technology, in particular to a gas drainage drilling arrangement method during initial mining and normal recovery of a fully mechanized mining face with a large mining height. Background technique [0002] Gas drainage technology in goafs with high-level drilling is widely used as an effective method to control gas in goafs. However, in the initial stage of mining in fully mechanized mining working faces with large mining heights, the old roof of the coal seam has not been crossed, and the cracks in the roof are not fully developed. High-level drilling cannot Play a role. However, in the initial stage of mining, due to the production process and other factors, the amount of coal left in the goaf is large, and the gas emission in the goaf is relatively large. area phenomenon. For the gas control during the initial mining of the fully mechanized mining face with large mining height, it is ma...

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Application Information

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IPC IPC(8): E21F7/00
CPCE21F7/00
Inventor 张国亮刘立州赵学良申晋伟尚玮炜吴晋军罗华贵陈备王宁
Owner SHANXI JINMEI GRP TECH RESEACH INST
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