三车道大断面高速公路隧道稳定性数值模拟

Numerical Simulation for the Stability of Large Cross Section Expressway Tunnel With Three Lanes

随着我国高等级公路的发展,三车道大断面公路隧道将成为高等级公路隧道的重要组成部分,这同时也对高速公路隧道的设计和施工提出了更高的要求。文章以杭新景高速公路设岭隧道为例,结合该隧道的监控量测,分析了围岩变形过程并针对监测数据进行了动态反馈,同时检验了施工单位根据反馈情况采取措施后的效果。最后通过Plaxis有限元软件模拟了整个隧道围岩的变形过程,取得了良好的效果。由此可见,通过有效的监控动态反馈及有限元模拟,能有效的对隧道开挖过程中的围岩变形进行预测,从而大大降低隧道施工中的风险,保证隧道的施工安全。

With the development of the expressway, the large cross section expressway tunnel with three lanes will be an important part of the highway tunnels. So the stricter requirements for the design and construction of the expressway tunnels are required. In this paper, taking the Sheling tunnel in Zhejiang province as an example, the deformation rule of the rock is studied. In addition, the process of the rock is simulated by FEM based on the in - situ monitoring data. The results show that the deformation of the rock can be predicted by effective monitoring and finite element analysis, and the danger of the construction can be controlled effectively as well to assure the safety of the tunnel.