冻土与扩大台基相互作用的有限元分析  

A Finite Element Analysis of the Coaction between Frozen Ground and Spread Wall Foundation

作　　者：王正中[1,2] 张长庆[1,2] 沙际德[1,2] 

机构地区：[1]西北农业大学水利与建筑工程学院 [2]中国科学院冻土工程重点实验室

出　　处：《西北农业大学学报》1998年第5期9-14,共6页Journal of Northwest Sci-Tech University of Agriculture and Forestry（Natural Science Edition)

基　　金：中科院冻土工程重点基金

摘　　要：以冻土与扩大台基作为一个整体结构，将各向弹性模量及泊松比随温度、水分、应力变化的冻土视为正交各向异性的非线性材料；将冻土冻胀系数作为负线膨胀系数，按结构温度应力的计算方法，应用结构非线性分析的有限元法，对冻土与扩大台基之间的相互作用进行了数值计算，获得其应力场、位移场及冻土与扩大台基之间的各种作用力；理论分析结果与模型试验吻合，并提出了一种求解冻土与基础相互作用的通用数值分析方法。In this paper,frozen ground and spread wall foundation are regarded as a whole structure.The frozen ground, whose varions chord modulus and Pission's Ratio change with temperature,moisture and stress,is regarded as orthotropic nonlinear material.The heaving coefficient is regarded as negative linear expansion coefficient.According to the calculation procedure of structural thermalstress,the numerical calculation of the coaction between frozen ground and spread wall foundation is made by means of finite element mothod of constructional nonlinear analysis,and the stress field,displacement field of this system and other various acting forces between frozen ground and spread wall foundation are obtained.The theoretic analytic result conforms with the model experiment,hence a universal and accurate numerical analytic method to seek the coaction between frozen ground and wall foundation is put forward for reference and application in production and design.

关 键 词：冻土 扩大台基 非线性有限元法 结构分析 

分 类 号：TU445[建筑科学—岩土工程]