圆形地下连续墙水平位移影响因素的敏感性分析

Sensitivity Analysis of Factors Affecting Horizontal Displacement of Circular Diaphragm Wall

设计作为支护结构的圆形地下连续墙需要对基坑开挖过程中的墙体水平位移作出有效的估算。文章为探究影响墙体水平位移的控制性参数,结合平南三桥北岸拱座基础的圆形地下连续墙工程背景,采用考虑环向效应及施工过程的弹性地基梁法,建立结构有限元模型,以结构几何条件作为分析参数进行敏感性分析。结果表明:地下连续墙墙厚和外径是影响墙身水平位移的主要因素。研究结果可为圆形地下连续墙设计、优化提供参考。

Designing a circular diaphragm wall as the supporting structure requires an effective estimation for the horizontal displacement of the wall during excavation.In order to explore the control parameters affecting the horizontal displacement of the wall,combined with the circular diaphragm wall at the north-bank abutment foundation of Pingnan Third Bridge,this article establishes the structural finite element model by using the elastic foundation beam method considering the hoop effect and the construction process,and performs the sensitivity analysis with the structural geometry as the analytical parameter.The results show that the thickness and outer diameter of diaphragm wall are the main factors affecting the horizontal displacement of the wall.The research results can provide the reference for the design and optimization of circular diaphragm wall.