沉埋桩加固滑坡体模型试验的三维有限元模拟

Three dimensional FEM simulation of slope reinforcement by deeply-buried pile

为了研究沉埋桩加固滑坡的力学机制,兰州中铁西北研究院完成进行了5组沉埋桩的室内大型物理模型试验。在沉埋桩加固滑坡体的模型试验中,坡体不同部位的桩所受到的推力有显著差别,呈现明显的的空间效应,因此不能等同于平面应变问题。对多组模型试验进行了三维非线性有限元模拟,数值模拟结果与试验数据相近,证明有限元方法可以用于沉埋桩的设计。

In order to study the mechanism of how deeply-buried piles reinforce slope,five groups of large scale physical model tests were conducted in the lab of Chinese Northwest Railway Academic of Science. In the experiments,pressure endured by deeply-buried pile in different places is not the same,which indicates that the experiment can’t be simplified to plane strain problem. Finally,several groups of model tests are simulated by three-dimensional finite element of elastic-plasticity. The result is almost identical to the experimental data,this justifies the application of three-dimensional fem method to design deeply-buried pile.