引入三维接触单元模拟冻土与桩共同工作  

Adopting 3D contact element to simulate pile-frozen soil interaction

作　　者：唐丽云[1] 奚家米[1] 杨更社[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《西安科技大学学报》2007年第3期337-340,351,共5页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(40372119);陕西省自然科学基金项目(2003D05)

摘　　要：运用虚位移原理推导出三维非线性接触单元的等效单元刚度一约束矩阵;通过建立冻土地基的热弹塑性-蠕变增量应力应变关系及几何方程得出冻土地基的热弹塑性-蠕变单元平衡方程。根据桩土共同作用的工作特性,通过引入非线性接触单元将冻土地基的热弹塑性蠕变非线性有限元计算模式与混凝土桩联系起来,建立了冻土区桩土共同作用的热弹塑性蠕变非线性有限元计算模型,通过模型计算结果与实测比较表明,该计算模型能较好地体现桩冻土共同工作性能。Applying the principle of virtual displacement, derivates the equivalent element stiffness-restricted matrix of 3D nonlinear contact element; Establishing incremental stress-strain relationaship and geometric equation, get the Thermo-Elastic-Plastic Creep element equilibruim equation of the frozen foundation. Based on the working characteristics of the pile-soil interaction, using 3D nonlinear contact element, connects the Thermo-Elastic-Plastic Creep nonlinear finite element calculation of the frozen foundation with concrete pile, which sets up the Thermo-Elastic-Plastic Creep nonlinear finite element calculation model of the pile-soil interaction in frozen soil. Comparison of computing result and test in situation, it shows that the model is suited to simulating the working function of pile and frozen soil interaction.

关 键 词：冻土桩基 热弹塑性-蠕变 有限元分析 三维非线性接触单元 

分 类 号：O343.3[理学—固体力学]