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雷公浦小净距隧道的出口段堆积有较厚的坍塌堆积围岩,结合该隧道的工程实际情况,选取K70+520断面采用Plaxis软件进行数值模拟研究。数值模拟结果表明:在坍塌堆积围岩条件下采用3台阶法进洞存在稳定性问题;两侧拱脚塑性点分布较多,土体容易出现破坏;最大位移出现在后行左洞顶部,而最大受力部位出现在先行右洞左拱腰处。对比分析后行左洞的应力及变形得,后行左洞拱顶的压力模拟值与实测值较为接近,但是拱顶沉降的模拟值却比实测值大出许多,主要是由开挖未能及时布点造成,类似工程应及时的布置测点进行监控。
In the outlet section of the small clear distance tunnel of LeiGuPu, there is a thicker accumulation of surrounding rock accumulated in the tunnel. Based on the actual engineering conditions of the tunnel, K70 + 520 section was selected for numerical simulation using Plaxis software. The numerical simulation results show that there are some stability problems when the three-step method is adopted in the condition of collapsed surrounding rock. The plastic points on both sides of the arch are more distributed and the soil is prone to damage. The maximum displacement appears at the top of the left- The largest part of the force appears in the first right hole arch left waist. After comparing and analyzing the stress and deformation of the left hole, the simulated pressure values of the left dome vault are close to the measured values, but the simulation values of the vault settlement are much larger than the measured values, mainly due to the failure of excavation Timely distribution caused by similar projects should be timely arrangement of measuring points for monitoring.