正交各向异性冻土与建筑物相互作用的非线性有限元分析  

NONLINEAR FINITE ELEMENT ANALYSIS OF INTERACTION OF ORTHOTROPIC FROZEN GROUND AND CONSTRUCTION

作　　者：王正中[1] 沙际德[1] 蒋允静 张长庆[2] 

机构地区：[1]西北农业大学 [2]中国科学院冻土工程重点实验室

出　　处：《土木工程学报》1999年第3期55-60,共6页China Civil Engineering Journal

基　　金：中科院冻土工程重点基金;杨陵农业科技专项基金

摘　　要：将冻土与扩大墙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，对冻土与扩大墙基之间的相互作用进行数值计算，获得其应力场、位移场及冻土与扩大墙基之间的各种作用力；理论分析结果与模型试验吻合，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，供生产设计参考应用。In this paper, frozen ground and spread wall foundation is regarded as a whole structure.The frozen ground, whose various elastic moduli and Poisson Ratios change with temperature, moisture and stress, is taken as orthotropic nonlinear material and its heaving coefficient is regarded as negative linear expansion coefficient. According to the calculation procedure of structural thermal stress, the interaction between frozen ground and spread wall foundation is computed by means of finite element method of structural nonlinear analysis, and the stress field, displacement field of this system and various acting forces between frozen ground and spread wall foundation are then obtained.The theoretical analysis result agrees well with the model experiment. Finally a general and accurate numerical analysis method for solving the interaction between frozen ground and wall foundation has been put forward, It can be used in design or for reference.

关 键 词：冻土 扩大墙基 非线性有限元法 结构分析 建筑物 

分 类 号：TU435[建筑科学—岩土工程]