土与地下连续墙相互作用的非线性分析

本文采用有限元法对基坑开挖过程土与地下边疆墙相互作用进行非线性分析。分析时，对土体采用Ｄｕｎｃａｎ－Ｃｈａｎｇ双曲线应力－应变关系和Ｍｏｈｒ－Ｃｏｕｌｏｍｂ破坏准则，对土－混凝土墙体界面单元采用Ｃｌｏｕｇｈ－Ｄｕｎｃａｎ双曲线剪应力－剪切位移关系，参考有关试验确定计算参数，并模拟基坑的开挖程序和设置不同支撑构件的影响。分析结果与工程实测资料进行了比较，得出对设计和施工有价值的几点结论。

NON-LINEAR FINITE ELEMENT ANALYSIS FOR SOIL-DIAPHRAM WALLS INTERACTION

This paper has studied the interaction between soil and the diaphram walls in pit excavation by nonlinear finite element method. In the analysis,Duncan -- Chang 's hyperbolic stress -- strain relation and Mohr -- Coulomb failure criterion are adopted to soil. The calculation parameters are determined by the vertical extension or vertical compression axial symmetry test and plane strain is tested with triaxial apparatus. Clough -- Duncan's hyperbolic shear stress -- shear strain relation is adopted to the interface element between soil and concrete.The calculation parameters are determined by the direct shear test of the contact surface between soil and concrete. Simulant excavation procedure of foundation pit and installation of braces of anchors are taken into account. Analysis resultshave been compared with measured data of three engineering projects in Guangzhou. By integration with the calculation of other three engineering projects, we have got some conclusions which are useful in design and construction for diaphram walls.