大直径高位钻孔代替高抽巷抽采瓦斯的研究

Study on Gas Drainage with Large Diameter High Level Borehole to Replace High Level Gas Drainage Gateway

针对高抽巷施工工程量大、投入大的问题,在沙曲矿24207综采工作面进行了大直径高位钻孔替代高抽巷的试验,对二者的抽采效果进行了对比分析。高位钻孔抽采瓦斯效果达到了高抽巷抽采瓦斯的效果,且高位钻孔呈扇形布置,能扩大抽采范围,延长瓦斯抽采服务时间,提高瓦斯抽采率,将工作面回风瓦斯体积分数控制在0.33%左右。应用结果表明用大直径高位钻孔代替高抽巷进行瓦斯抽采是可行的。

According to the high engineering and high investment problems in a construction of high level gas drainage gateway, an exper- iment of large diameter high level borehole to replace a high level gas drainage gateway was conducted in No. 24207 fully mechanized coal mining face in Shaqu Mine and a comparison and analysis on the gas drainage effects of the two methods was conducted. The gas drainage effect with high level borehole was reached the gas drainage effect with high level gateway. The high level boreholes with a layout of fan could expand the gas drainage scope, could extend the gas drainage service time and could improve the gas drainage rate. The gas volume fraction of the air returning gateway in the coal mining face could be controlled around 0. 33%. The application results showed that the large diameter high level borehole was feasible to replace the high level gas drainage gateway for gas drainage.