One-face multi-roadway gas control method for large-mining-height large-mining-length working face

Abstract

The invention relates to a one-face multi-roadway gas control method for a large-mining-height large-mining-length working face, and belongs to the field of gas development and utilization. The methodcomprises the steps that a bottom drainage roadway and a coal roadway are arranged, gas pre-drainage is conducted in manners of bottom drainage roadway cross-layer drilling and coal roadway bedding parallel drilling, and a one-face four-roadway pattern is formed; a middle bottom plate drainage roadway is additionally arranged, cross-layer drilling is executed, outburst elimination is conducted ona gas drainage blank zone in the middle of the working face, and a one-face five-roadway pattern is formed; a middle coal roadway is arranged, bedding drilling is conducted on two coal seams, and a one-face six-roadway pattern is formed; and high drainage roadways are arranged in the coal mining working face in a staggered manner, and finally a one-face seven-roadway pattern is formed. Accordingto the one-face multi-roadway gas control method for the large-mining-height large-mining-length working face, the middle drainage roadway and the middle coal roadway are additionally arranged on a traditional one-face four-roadway gas drainage pattern, the coal seam gas drainage blank zone is reduced, the drilling depth is decreased, and the gas control period can be greatly shortened.

Description

technical field [0001] The invention belongs to the field of gas development and utilization, and in particular relates to a gas control method with "multiple lanes on one side" working face with large mining height and large mining length. Background technique [0002] In the process of coal mining, the roof of the fully mechanized mining face with large mining height deforms, sinks, and collapses due to the impact of mining, forming a large goaf. into the goaf, resulting in the accumulation of a large amount of gas deep in the goaf. Under the influence of concentration difference and gas pressure, it gushes out to the goaf and working face. Affected by the air leakage and the ventilation mode of the working face, the gas in the upper corner exceeds the limit, which seriously restricts the safe production of coal mines. The traditional gas area control method with one side and four lanes has a large amount of peripheral engineering, small reserves of the working face, and ...

AI Technical Summary

Problems solved by technology

With the deepening of mining depth, the gas content is higher, and with the increase of mining height and working face length, the effect of gas control on super-long working faces is not good, and it is impossible to effectively drain the gas in the blank zone

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