冲击载荷作用下巷道支护方案优化研究

摘要

针对老虎台矿深部开采矿震频繁的问题,对动静载耦合作用下的巷道支护方案进行优化.建立了动静载耦合作用下的数值模拟,分别对巷道在“无支护”、“锚杆+锚网支护”、“锚杆+锚网+U型棚复合支护”和“锚杆+锚网+O型棚复合支护”4种支护方案进行冲击载荷模拟,“锚杆+锚网+U型棚复合支护”方案巷道围岩的破坏深度为1～1.7 m,围岩受力均匀、破坏范围较小,对围岩控制的整体效果较好.对不同动载荷大小条件下的支护效果进行模拟,当动载荷大于70MPa时,巷道的围岩破坏范围超过了锚固区域,围岩的应力条件变差,巷道易发生失稳.该支护条件下动载的极限承载能力为70 MPa.%Aiming at the problem of deep mining and frequent mine earthquakes of Laohutai Coal Mine,the roadway support scheme under dynamic and static coupling was optimized.The numerical simulation of dynamic and static load coupling was carried out,and the numerical simulation was carried out on the roadway under the support conditions of "unsupported","bolt + anchor mesh support","bolt + anchor net + U shed support" and "bolt + anchor net + O shed support".The failure depth of surrounding rock of "bolt + anchor net + O shed support" scheme was 1 m to 1.7 m,and the stress of surrounding rock was lower,the overall effect on the surrounding rock control was better.The support effect under different dynamic load conditions was simulated.When the dynamic load was greater than 70 MPa,the failure range of the surrounding rock exceeds the anchorage area,the stress condition of the surrounding rock becomes worse and the roadway tends to be unstable.The ultimate load bearing capacity of the dynamic load was 70 MPa.