软土地层中盾构法开挖三维有限元模拟

以某条软土地层中开挖的地铁隧道为例,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ADINA三维动态模拟地铁隧道开挖过程,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,隧道轴线正上方地表沉降最为明显。

3D Finite Element Simulation on tunnel construction with shield in soft soil

Considering the shield construction in soft soil which had caused ground subsidence and impact on the building around which are valued day by day.Taking a metro shield tunneling in soft soil as an example,using ADINA,a large non-linear FEM software to simulate a 3D-FEM model in the excavating process of the shield construction,then the curve of subsidence that caused by shield method construction had been calculated.The ground subsidence distributing characteristic had been revealed.The cross hydroseparator curve of subsidence that caused by the disturbance of soil was in accordance with normal distribution curve that induced by Peck.Ground subsidence had been the most evidence in the top of tunnel axes.