论文部分内容阅读
研究缓慢卸载P波诱发岩体不连续断裂破坏的机制,并用相应的试验方法和数值模拟方法探究了其诱发岩体不连续断裂破坏的可能性。针对开挖区围岩,建立一个在缓慢卸载P波作用下含1%孔隙率岩体的数值计算模型,其缓慢卸载的P波由钢板撞击岩体来模拟产生。模拟结果表明,如果岩体中有缓慢卸载P波,且其强度在一定范围内,岩体不连续断裂破坏的现象就会发生,隧道周边就会出现分区破裂化现象;而快速卸载的矩形波不能诱发围岩分区破裂现象。
The mechanism of slowly unloading P waves induced by discontinuous fracture and failure of rock mass was studied. The possibility of discontinuous fracture induced by rock mass was probed by the corresponding experimental method and numerical simulation method. Aimed at the surrounding rock of excavation area, a numerical model of rock mass with 1% porosity under the action of P wave unloading slowly was established. The slowly unloaded P wave was simulated by impacting the rock mass against the rock mass. The simulation results show that if the P-wave is slowly unloaded in the rock mass and its intensity is within a certain range, the discontinuous fracture and failure of the rock mass will occur and the zone cracking will occur in the periphery of the tunnel; and the rapidly unloaded rectangular wave Can not induce rupture of rock partition.