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以贺西煤矿2406工作面为工程背景,结合采场围岩控制理论,分析了2406工作面采空区上覆岩层移动及裂隙发育特征。根据2406工作面瓦斯涌出来源分析,来自上邻近层及上覆煤层采空区的瓦斯涌入引起回风巷及上隅角瓦斯浓度偏高,采用顶板长钻孔瓦斯抽采技术对工作面进行瓦斯抽采,提高了工作面瓦斯抽采率,有效降低了回采工作面回风巷及上隅角瓦斯浓度,为治理回采工作面上隅角超限提供了新的思路,对离柳矿区瓦斯治理工作具有一定指导意义。
Taking the 2406 working face of Hexi Coal Mine as the engineering background and combining with the surrounding rock control theory of stope, the characteristics of overlying strata movement and fissure development in the gob of 2406 face are analyzed. According to the analysis of gas emission from 2406 working face, the gas influx from the upper adjacent coal mines and the overlying coal seam goaf caused the concentration of gas in the return airways and the upper corner gas to be too high. Using the technology of gas drainage with long holes in the roof, Gas extraction, raising the rate of gas drainage in the working face, effectively reducing the return airway in the working face and the gas concentration in the upper corner, providing a new idea for overriding the upper corner of the mining face, Gas management has some guiding significance.