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盾构施工会导致地层的沉降并会对周边的建筑产生影响,对其进行分析具有重要的工程价值。在综合考虑了现有的有限元模拟方法的基础上,结合济邵高速公路中开挖的隧道为例,根据非线性有限元法的基本原理,利用大型非线性有限元软件ANSYS三维动态模拟隧道开挖的过程,计算结果揭示了在盾构推进过程中地表沉降分布以及特点,得到盾构法开挖引起的地表沉降曲线,其形态与Peck计算得出的横向地表沉降槽正态分布曲线的形态基本一致。仿真结果揭示了隧道推进过程中的周围土体的移动规律、地表面水平位移及地面沉降规律、已建隧道管片应力变化规律。
Shield construction will lead to the formation of subsidence and the surrounding buildings will have an impact, its analysis has important engineering value. Based on the existing finite element simulation method and the tunnel excavation in Ji-Shao Expressway as an example, according to the basic principle of nonlinear finite element method, a large-scale nonlinear finite element software ANSYS 3D dynamic simulation tunnel Excavation process, the calculation results reveal the surface subsidence distribution and characteristics in the process of shield advancement, get the settlement curve of the earth surface caused by shield excavation, the shape and Peck calculated horizontal surface subsidence groove normal distribution curve Basically the same form. The simulation results reveal the movement of surrounding soil, the horizontal displacement of the ground surface and the land subsidence regularity of the tunnel during the tunnel propulsion, and the stress variation of the tunnel segments built.