Method for gas grading zoning extraction for goaf of working face of single mining thick coal seam

Abstract

The invention provides a method for gas grading zoning extraction for a goaf of a working face of a single mining thick coal seam, belongs to the technical field of gas extraction of the coal mine goaf, and can solve the problem of gas in a return air roadway, the working face and an upper corner is transfinite in the recovery process of the high-yield and high-gas working face of the single mining coal seam. According to method, according to different surge sources of goaf gas in the mining process of the working face, the formation process of the fracture space of a top plate of the goaf, ofthe working face and the gas gathering characteristics in the goaf range, three extraction systems are established, different extraction technology measures are extracted, and a formed technical system is integrated. Each extraction technology extracts gas pf the goaf during the stoping process of the working face according to the arrangement characteristics of the extraction technology, so thatthe gas extraction of the goaf is maximized.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in goafs of coal mines, and in particular relates to a method for gas drainage in goafs in stages and zones in a single mineable thick coal seam with high gas and high production working face. Background technique [0002] A high-yield and high-gas working face with a single mineable thick coal seam means that the thickness of the main mining coal seam of the mine is ≥3.5m, the output is ≥10,000t, and there are two or more roadways on the return air side of the working face. [0003] When the high-yield and high-gas working face of a single thick coal seam is recovered, the gas content of the coal seam has been extracted up to the standard, but the coal seam still contains desorbable gas, and the production of the working face is large. The rapid desorption during the recovery process leads to a large amount of gas emission in the high-production working face. The partial Y-shaped ventilatio...

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Problems solved by technology

[0004] Aiming at the problem of excessive gas in the air return lane, working face and upper corner in the recovery process of the high-yield and high-gas working face of a single mineable coal seam, the present invention provides a stage-by-stage method of goaf gas in the high-gas and high-yield working face of a single mineable thick coal seam. The zonal drainage method is formed by arranging different drainage technical measures in the top and bottom fissure spaces of the goaf according to the formation process of the roof and floor fissure space and the characteristics of gas sources at various stages of mining in a single thick coal seam working face. Technology Integration of Gas Drainage in Goaf

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