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

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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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 the cracks in the roof are not fully developed. High-level drilling cannot Play a role

However, in the early 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

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