接头形式对框格式地下连续墙应力变形影响的有限元分析

Influence of Joints on Stress and Displacement of Sash-shaped Diaphragm Wall by FEM Analysis

在水电工程中采用地下连续墙处理复杂地质条件的地基时,在施工过程中不可避免地产生施工接头,接头的存在对地下连续墙的整体受力性能存在一定的影响,成为困扰工程界的一个难题。根据桐子林水电站末段框格式地下连续墙地质条件,在连续墙上分别设置刚性接头、铰接头及半自由接头,模拟地下连续墙在工程上常采用的各种接头形式,建立了不同接头形式的3组框格式地下连续墙槽段有限元模型。基于ABAQUS软件对框格式地下连续墙在不同接头形式下的施工过程进行了非线性有限元数值模拟,详细分析比较了3种接头形式的地下连续墙在最危险施工工况下的应力与变形,得到了不同的施工接头对框格式地下连续墙应力变形的影响情况,研究成果可为类似工程提供借鉴。

Construction joint,which is resulted from underground diaphragm wall construction to deal with complex geological foundation for hydropower project,is a difficulty in engineering because it affects the overall mechanical properties of the underground diaphragm wall. According to the real geological conditions under the last part of diaphragm wall of Tongzilin hydropower project,we established finite element models of sash-shaped underground diaphragm wall with three different kinds of joints( rigid joints,hinged joints and semi-free joints). The stress and deformation of the wall respectively with these three kinds of joints were analyzed and compared under the most adverse working condition in ABAQUS non-linear simulation. The influence of joint on the stress and deformation of underground diaphragm wall was obtained. The result is a reference for similar projects.