圆形基坑地下连续墙分析方法研究  

Analytic method of diaphragm walls of circular foundation pits

作　　者：沈健[1] 王卫东[1] 翁其平[1] 

机构地区：[1]华东建筑设计研究院有限公司,上海200002

出　　处：《岩土工程学报》2008年第S1期280-285,共6页Chinese Journal of Geotechnical Engineering

基　　金：上海市科技攻关项目(052112010);上海市优秀学科带头人计划(07XD14206)

摘　　要：上海世博500kV地下变电站基坑开挖深度34m,圆形地下连续墙直径130m。采用3种计算方法对地下连续墙变形及内力进行对比分析。平面弹性地基梁法忽略了圆形围护结构的拱效应,不利于对圆形地下连续墙受力的全面认识与设计安全。三维弹性地基板法计算原理基于平面弹性地基梁法,且计算模型可以反映圆形围护结构的空间效应。三维连续介质有限元法考虑围护结构与土体的共同作用,得到的地墙变形与内力相比三维弹性地基板法均更小。与监测数据的比较表明,地墙的实际变形介于三维弹性地基板法与三维连续介质有限元法分析结果之间,且更接近于三维弹性地基板法。圆形基坑地下连续墙应采用三维弹性地基板法进行设计计算。The excavation depth of the Shanghai 500 kV World Expo Underground Transmission Substation is 34 meters and the diameter of the circular diaphragm walls is 130 meters.Three calculation methods were used to analyze the deformation and inner forces of diaphragm walls.2D method of beams on elastic foundation ignored the arch effect of circular structures.It was not good for estimating the inner forces of circular diaphragm walls.The principles of 3D spring-slab approach were based on the 2D method of beams on elastic foundation.The model could reflect the space effect of circular structures.The 3D continuum FEM considered the interaction between the retaining structures and soil.The analytic results were smaller than those of the 3D spring-slab approach.According to the measured data,the actual deformation of the diaphragm walls was between the analytic results of the 3D continuum FEM and the results of the 3D spring-slab approach.Meanwhile,it was closer to the latter.It was suggested that the 3D spring-slab approach should be used to design the circular diaphragm walls.

关 键 词：圆形基坑 地下连续墙 平面弹性地基梁法 三维弹性地基板法 三维连续介质有限元法 

分 类 号：TU476.3[建筑科学—结构工程]