近距离煤层同时开采巷道布置优化研究

Study on Optimal Roadways Layout of Contiguous Seams by Simultaneous Mining

为确定某煤矿3和4号近距离煤层同采时下煤层回采巷道布置方式,结合煤层地质条件,采用理论分析确定下煤层巷道采用外错式布置方式,运用FLAC3D数值模拟软件确定下煤层回采巷道的合理外错距离为20 m,通过现场对4号煤层3409工作面材料巷顶底板及两帮变形进行观测分析,巷道在距工作面60 m以内顶板最大位移为150 mm,两帮最大位移为120 mm,超前工作面60 m以外,巷道变形量趋于稳定,结果表明,2层煤同时开采,工作面巷道外错20 m,在加固条件及合理的锚杆锚网支护作用下,巷道稳定性良好,巷道围岩变形得到了有效控制,能够满足工作面正常推进的要求。

In order to determine No. 3 and No. 4 coal seam roadway layout of one mine during simultaneous mining,combining with the geo-logical condition of coal seam,firstly,by the theoretical analysis,the roadways of the mining face mined simultaneously were arranged out-ward staggered.Then the numerical simulation FLAC3D was adopted to optimize the distance between roadways of contiguous seams by min-ing simultaneously,and the rational separation distance of roadways was 20 m. Finally,through the coal mine practice,the roof-to-floor convergence was 150 mm,and the convergence of two side walls was 120 mm in the lower roadway of No.3409 working face.The influence scope was limited in the range of 60 m in front of working face.The layout of roadways in contiguous seams by simultaneous mining was ra-tional and the deformation of the surrounding rock of roadways was controlled effectively.