饱水冻土水热力耦合分析

The numerical analysis of the phase-change field of temperature coupled with moisture, stress in saturated frozen soil

冻土在冻结、融化的过程中,伴随着土中水的冻结和融化,土的体积也随之发生变化。这种体积变化常常造成寒区建筑的破坏。为解决工程实践问题,本文提出了“三场”耦合分析的一般数学格式来模拟分析冻土冻结过程,并采用有限元思想导出相应的时空离散化方程,给出了非线性数值求解的迭代计算步骤。另外,文中给出具体的数值算例,以验证本文方法的可靠性、有效性和计算精度。

The volume of frozen soil will change because of the moisture freezing or thawing. This is one of the main factors that make the destruction of the constructions in low temperature region. In this paper, an analysis model is given to simulate the freezing process of the frozen soil. By the use of FEM, the detailed deduction of the computational equations is given as well the iterative calculation process. Also, an example is presented to testify the validity and precision of the model.