许疃煤矿大采高综放工作面瓦斯治理技术

Gas Control Technology at Fully Mechanized Caving Face with Large Mining Height in Xutuan Colliery

许疃煤矿针对大采高综放工作面瓦斯治理问题,采用了工作面顺层钻孔预抽本煤层瓦斯、顶板高位上向穿层钻孔抽采大采高工作面上邻近层瓦斯、顶板高位走向钻孔抽采本煤层同时拦截抽采上邻近层卸压瓦斯的综合瓦斯抽采技术。针对大采高综放工作面顶板高位走向钻孔布置层位的选择,通过相似模拟试验、关键层理论分析和UDEC软件模拟研究许疃煤矿大采高工作面顶板冒落规律,寻找大采高采场上覆岩层中裂隙位置和顶板瓦斯富集区;以此确定顶板高位钻孔的相关抽放工艺参数,为大采高工作面采空区高位瓦斯抽放钻孔的设计提供了理论依据。同时为大采高工作面上邻近层卸压瓦斯抽采钻孔的设计提供了理论指导。

For the problem of gas control at fully mechanized caving face with large mining height in Xutuan Colliery,the comprehensive gas suction technology is proposed with seam gas pre-drainage at working face by bedding drilling,gas suction in upper adjacent seams at working face with large mining height by high-level roof upward crossing drilling,seam gas suction and interception suction of reliving gas from upper adjacent seams by high-level roof strike drilling.As to the selection of the horizon layout of high-level strike boreholes at fully mechanized caving face with large mining height,the author makes a study on the laws of roof fall for the fracture position in overlying strata and the roof gas accumulation area to determine the drainage technological parameters of high-level roof borehole,which provides theoretical basis for the design of high-level gas suction borehole in goaf and reliving gas suction borehole in upper adjacent seams in fully mechanized caving face.