含损伤的冻土本构模型及耦合问题数值分析

从复合材料的细观力学机理出发，建立了含损伤的冻土弹性本构模型. 对于在不同冰体积 含量和不同温度下的冻结砂土，由该损伤本构模型计算的结果与实测的应力-应变曲线比较 吻合. 利用自主开发的程序，分别对渠道冻结和冻土路基的水分场、温度场、应力场3场耦 合进行数值模拟，得到了比较准确、详尽的符合实际的温度场与应力场、位移场、应变场耦 合的计算结果，与前人的计算及实测结果相符合，规律一致. 表明该程序能够计算冻土材料 的相关物理量，并能很好地描述这些相关物理量之间的关系.

CONSTITUTIVE MODEL OF FROZEN SOIL WITH DAMAGE AND NUMERICAL SIMULATION OF THE COUPLED PROBLEM

On the basis of the microscopic mechanics of composite material, an elastic constitutive model for frozen soil containing damage is presented. For the frozen sand soil with different ice contents and under different temperature conditions, the result calculated by the constitutive model agrees with the actually measured stress- strain curve. After numerically simulating the coupled problem of water, temperature and stress fields of channel frozen and frozen soil foundation by means of a program, a more accurate and practical temperature field is obtained, which is consistent with the prediction and tests in literature. It is shown that related physical properties of frozen soil and a quantitative relationship between them can be obtained.