基坑支护中土钉墙的仿真数值计算

Simulated Calculation on Soil Nailed Wall in Support of Foundation Ditch

给出了一种可同时模拟基坑开挖和土钉加固过程的等效面力法——剪力法。对开挖过程中实测与计算的位移场差值，采用荷载转移法对其进行动态修正，并采用中点增量法，编制了邓肯－张大型三维非线性有限元程序。最后，对某一具体基坑工程中的分级开挖和加钉同时进行了仿真模拟计算，取得了较满意的结果。

A mathematic model using equivalent surface shear force method for simultaneously simulating excavation and soil nail reinforcing process is proposed in the paper. The differences between calculated and measured values of displacement field are dynamically modified by a load transfer method. And the Duncan Zhang's 3 D nonlinear finite element program is worked out by using the middle increment method. At last, some simulating calculations for an engineering excavation by phases as well as simultaneously nailing are conducted, and the results obtained are satisfactory.