无假顶下分层平巷布置技术研究

Lower Roadway Layout in No False Top Coal Mining

大柳塔活鸡兔井1-2煤采用分层开采的方法,但在上分层开采过程中没有铺设人工假顶,导致下分层开采时巷道布置困难。针对此问题,采用综合比较法最终选定外错式布置巷道。通过理论计算及数值模拟的方法得出上、下分层巷道合理的外错距应为4.2 m,据此结果布置下分层平巷。同时开采实践显示开采期间矿山压力不明显,无巷道变形现象,外错式布置方式比较合理。

Huojitu well in Daliuta colliery decided to use slice mining to mine 1-2 coal seam, but workers did not manufacture artificial roof in upper slice coal mining, resulting in the difficulties of roadway layout. In this sense, the mine determined to utilize outward staggered arrangement through the comparison of internal outward and vertical roadway layout. Then by theoretical consideration and numerical simulation , the mine determine the upper and lower roadway outward distance is 4.2 m. And the mining practice shows that ground pressure is low without distortion of roadway.