大倾角厚煤顶开切眼高预应力锚杆索支护技术实践

本文针对＋708—＋750 m大倾角厚煤顶开切眼支护难题,提出了采用高预应力锚杆索支护技术。通过现场观测,切眼两帮移近在13 d之后趋于平稳,最大移近量为185 mm,平均移近量为14.2 mm/d;顶板下沉量在10 d后趋于稳定,最大下沉量为127 mm,平均下沉量为12.7 mm/d。该支护技术有效控制了切眼围岩变形,为后面支架及综放设备的运输与安装提供了保障。

Large Dip Angle Thick Coal Opening Cut Eye High Pretension Bolt Anchor Supporting Technology practice

Based on the support problem of ＋708～＋750 m large inclination cut with thick coal roof, high pretension bolt anchor supporting technology was put forward. Field measurement result showed that the both sides deformation tended steady after 13 d, the maximum deformation was 185mm and the average deformation was 14.2 ram/d; the roof subsidence tended steady after 10 d, the maximum subsidence was 127mm and the average subsidence was 12.7 mm/d. The supporting technology controlled the deformation of cut and provided protection for supporting transportation and installation.