冻土地区水渠的温度场和应力场数值分析

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-应变曲线相吻合.利用自行开发的程序进行数值模拟,通过对渠道冻结水分场、温度场、应力场三场的数值计算结果分析,得到了比较准确且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,与前人计算结果相符合,规律一致.算例表明,此程序能够计算冻土材料的相关物理量,且能很好地描述它们之间的关系,可为工程设计和施工提供必要的参考.

Numerical Analyses of the Temperature and Stress Fields of Channel in Frozen Soil Regions

In this paper,an elasticity constitutive model of damaged frozen soil is established.A calculation is made for frozen sand soil under different ice content and temperature conditions,using damage constitutive model,which agrees with the curves of measured stress-strain.Numerical computations are done by using the procedure developed in this study,and the computation results of moisture,temperature and stress fields of the channel are analyzed.It is found that the results are more exact and agree with actual temperature field,stress field,moisture field and strain field,and is consistent with the results of predecessors and the test results.The procedure developed in this study could calculate the related physical properties of frozen soil.In addition,it could describe the relation between the related physical quantities well,and provide a necessary reference for engineering design and construction.