竖直荷载下群桩受力变形特性弹塑性分析

群桩作为桩基的一种主要形式 ,其受力变形特性的研究一直受到人们的重视。过去的研究主要是通过实验方法和理论分析来进行的。本文用有限元进行近域土和桩的分析 ,对远域土采用无限单元 ,在桩土接触面引入 Goodman接触面单元 ,从而用有限元——接触面单元——无限元的耦合方法将群桩和土体作为一个整体进行弹塑性分析。分析中用修正剑桥模型进行近域土体的模拟 ,对桩土接触面及远域土体进行非线性分析。分析结果表明 ,本文的分析与实测基本吻合 ,说明本文的耦合方法能对群桩的受力变形特性进行较好的模拟

Analysis of Elasto-plasticity of Bearing and Deforming Behavior of Group-Pile under Vertical Load

The subject of this paper is to study the bearing and deforming behavior of group pile. The FEM is used to simulate the piles and near field soil mass and the IEM is adopted to simulate the piles and distant field soil. In addition, the Goodman joint elements are introduced to the pile soil interface. The modified Cambridge model is employed in simulating the near field soil and the nonlinear analysis method is used in the pile soil interface and distant field soil. The analytical results are basically identical to the experimental ones. It is concluded that the coupled analytical method given in this paper can be used to analyze the bearing and deforming behavior of piles and soil.