框架锚杆支护边坡三维弹塑性有限元分析

Three-dimensional Elastc-Plastic Finite Element Analysis of the Slope Protected by the Frame with Anchors

应用弹塑性有限元方法,研究了框架锚杆支护边坡受力机理。考虑土体与支护结构相互作用及其协同工作建立三维有限元模型。应用了非线性静力性能的弹塑性模型模拟土体;采用了可以描述锚杆在进入塑性阶段强化性质的双线形弹塑性模型模拟锚杆;土与结构的相互作用由接触单元模拟。研究内容包括支护结构的内力、坡后土体水平位移、坡后土体的地表沉降、土压力以及土压力的空间性,得到了一些对边坡工程设计和施工有工程实际意义的结论。

Using elasto-plastic finite element method, on the base of work together and interaction between loess and flexible retaining wall, 3-D nonlinear FEM （ADINA） is used to analyze the performance of slope protected by the frame with anchors. A model that is capable of simulating the nonlinear static elastic-plastic behavior of soil is used to model the soil, and a bilinear elastic-plastic model that has hardening behavior is used to model the anchor. Friction-element is employed to describe the soil-structure interaction behavior. The study is focused on the horizontal and vertical deformations of the slope, the internal forces of retaining structures as well as the earth pressure and space earth pressure. Some significant conclusions are remarked.