某软弱围岩公路隧道开挖工法数值模拟与监测数据对比分析

Comparative Analysis of Numerical Simulation and Monitoring Data for Excavation Method of a Soft Surrounding Rock Road Tunnel

目前在软弱围岩隧道开挖中经常出现塌方及隧道大变形等问题,而合适的施工方法可以不同程度地降低这些风险。本文以某公路隧道为对象,通过对二台阶预留核心土法、三台阶预留核心土法、单侧壁导坑法三种施工工法进行数值模拟,经对比分析得到这三种不同施工工法下围岩的变形规律、应力特性以及此三种工法的不同适应情况;并结合现场监控量测数据对比分析,选出最适合该隧道的施工方式,以确保施工安全及施工进度,为软弱围岩下修建隧道的设计与施工提供一些依据和参考。

At present,problems such as landslides and large deformation of tunnels often occur in the excavation of soft surrounding rock tunnels,and suitable construction methods can reduce these risks to varying degrees.In this paper,taking one road tunnel as an object,with numerical simulation on two steps reserved core soil method、three steps reserved core soil method and the one-side pilot drifting method,we can get the surrouding rock deformation law,stress characteristics and different adaptation of the three tunnel methods by comparison.And combined with monitoring data,the best method is selected for the tunnel in order to ensure the construction safety and construction schedule,and provide some basis and reference for design and construction of soft rock tunnel.