沿空掘巷锚网梁索联合支护技术

Technical of combined supporting with bolt mesh and cable in driving roadway along goaf

本文结合沿空掘巷支护特点,通过数值模拟分析确定了山脚树矿21128回风巷合理煤柱的留设宽度为7 m.采用钻孔岩层结构探测技术手段对巷道围岩松动情况进行探测,确定了巷道松动圈影响范围一般在2.2 m左右,为支护方式的确定和支护参数优化提供了实际依据,提出了锚网梁索支护方案.通过FLAC3D有限差分软件分析和工程监测结果表明,巷道围岩变形在安全生产允许范围内,顶板离层较小,巷道围岩得到了有效控制.

Based on the characteristics of supporting design of road driving along next goaf,the reasonable design of coal pillar width of returning air lane 21128 in the Bottom Tree Mine was 7 m.The drilling strata structure detection technology was adopted to detect the surrounding rock loose condition,the influence circle of roadway loose was determined around 2.2 m,which it provided the practical basis of determination of supporting method and parameters optimization of support,and proposed the beam and metal net supporting scheme as well. The results show that the deformation of roadway surrounding rock in the range of allowable safety production, roof abscission layer of is small,and roadway surrounding rock is effectively controlled.