近距离煤层采空区下裂隙发育顶板巷道支护技术研究

Research on support technology for roadway with fractured roof in close coal seams

针对近距离煤层采空区下裂隙发育顶板巷道变形难以控制的问题,以巷道位置选择、裂隙发育顶板结构分析为出发点,采用小孔径围岩结构窥视、数值计算的方式研究了上、下部煤层顶板岩层结构和应力分布特征。研究结果表明,同向内错布置可避开上部煤层残留煤柱集中应力传递和扩散对下部煤层的影响,解放了下部煤层开采部署;近距离煤层层间距小,夹层裂隙发育,必须严格控制岩层的进一步扩容变形,控制裂隙扩展。针对近距离煤层采空区下裂隙发育顶板提出了采用高预应力全长锚固锚杆支护系统,下部煤层巷道变形得到了有效控制,取得了良好的效果。

Aiming at the difficulty in controlling the deformation of roadway with fractured roof in close coal seams, taking the location of the roadway and the fractured roof structure as the starting points, The structure and stress distribution characteristics of the rock strata in the upper and lower coal seam roof were studied by using the method of peeping of the small aperture and numerical calculation.The results indicated that the inward layout can avoid the influence of the concentrated coal pillar stress delivery of the upper coal seam on the lower coal seam and liberating the mining arrangement of the lower coal seam; the interval between adjacent coal seams was small, and the interlayer was developed.It was necessary to strictly control the further expansion and deformation of the rock and control the expansion of the fracture.A high-pretension full-anchor bolt support system was proposed for the roadway with fractured roof in close coal seam, and the deformation of the lower coal seam roadway was effectively controlled and good results were obtained.