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以曲江煤矿为例,针对煤矿深部大巷围岩大变形的支护难题,通过理论分析、实验室实验、数值计算、现场调查及监测等方法,对大巷围岩破坏机理及合理的锚索二次支护时间进行研究.研究表明,高应力作用下巷道围岩蠕变、支护方式的不合理等因素是造成大巷围岩大变形的主要原因,但通过顶底角锚杆、锚索的作用可以在很大程度上改善围岩的应力状态,特别是减少两帮对底板的应力传递作用;巷道开挖进行锚网喷支护1个月后进行锚索等二次支护较为适宜.
Taking Qujiang Coal Mine as an example, aiming at the problem of large deformation of surrounding rock in deep laneways in coal mines, this paper analyzes the failure mechanism of surrounding rock and the reasonable anchors by theoretical analysis, laboratory experiments, numerical calculation, field investigation and monitoring. The research shows that the factors of creep and the irrational support of roadway surrounding rock under high stress are the main reasons for the large deformation of surrounding rock in the roadway.But through the top and bottom anchor, The role of the anchor cable can greatly improve the stress state of the surrounding rock, in particular, to reduce the two to the floor of the stress transfer role; tunnel excavation anchor net spray support 1 month after the anchor cable secondary support More appropriate.