高瓦斯综放面外错高抽巷及穿层钻孔合理层位研究

Reasonable Horizon Study of High Drainage Roadway and Perforation Drilling in High Gas Caving Face

针对高瓦斯综放工作面回采工程中上隅角瓦斯超限问题,以华彬煤业蒋家河煤矿203工作面为研究背景,提出顶板走向外错高抽巷配合穿层钻孔抽采采空区瓦斯技术。通过理论计算和数值模拟结果,确定了高抽巷合理层位布置,根据现场抽采参数及效果分析,外错高抽巷配合穿层钻孔抽采稳定后,高抽巷穿层钻孔抽采瓦斯平均浓度为26%,上隅角瓦斯浓度平均值稳定到0.45%左右,回风巷口瓦斯浓度平均值稳定到0.42%,解决了该矿井上隅角及回风巷口瓦斯超限难题,确保了矿井的安全生产。同时,为类似条件综放工作面采空区瓦斯治理具有一定的理论指导意义和实用参考价值。

Gas gap fxceeding limit in upper corner of high gas fully mechanized caving face, study on the working face of Jiangjiahe coal mine in Huabin coal industry, puts forward the technology of gas drainage in goaf with top drift and outside drift roadway. Through theoretical calculation and numerical simulation results, and determine the rational layout of the high pumping tunnel, according to the site drainage parameters and effects analysis, after the stable extraction by the combination of external staggered high extraction and through layer drilling, average concentration of through layer drilling and extraction 26%, the gas in the upper corner is stable at 0.45% on average, eturn air lane is stable at0.42%, and solved the gas overrun problem in the upper corner and the return airway of the mine, to ensure the safety of the mine production.At the same time, it has a certain theoretical significance and practical reference value for gas control in goaf of fully mechanized top coal caving face under similar conditions.