地下连续墙的有限元数值计算简化模型  

Simplified numerical model of diaphragm walls

作　　者：姜忻良[1] 徐炳伟[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《岩土工程学报》2008年第S1期16-20,共5页Chinese Journal of Geotechnical Engineering

摘　　要：选取地下连续墙槽段的宽度作为其计算宽度,结合施工过程,通过分析地下连续墙的接头方式以及所在位置来确定其边界条件,并且考虑土的分层分布,基于ANSYS软件及其二次开发,采用双曲线非线性弹簧元模拟土的弹塑性,建立了地下连续墙的有限元数值计算简化模型。通过计算得到开挖过程中地下连续墙变形、内力、支撑内力、墙侧土压力变化及分布情况。工程实例表明,该模型计算结果与工程实际吻合较好,可以有效模拟基坑开挖整个过程,指导地下连续墙设计和施工。Considering the distribution of soil strata,the finite element method simplified model of the concrete diaphragm walls under construction was established by secondary development in ANSYS.The hyperbolic nonlinear spring elements were adopted to simulate the elasto-plastic interaction between the wall and the foundation soil.The boundary conditions were determined according to the joint modes of diaphragm wall segments,and the slot width was taken as the calculation width. Through this model,the deformation,internal forces of the diaphragm walls,the distribution of lateral soil pressure and the internal forces of the strut could be obtained.It's proved by the engineering cases that the calculated results agree quite well with the in-situ measurements,and can effectively simulate the whole excavation process and provide guidance to the practical design and construction of concrete diaphragm walls.

关 键 词：地下连续墙 双曲线非线性弹簧元 有限元 数值计算 

分 类 号：TU476.3[建筑科学—结构工程]