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

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。

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

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.