饱和颗粒土冻胀末透镜体演变数值模拟

Numerical Simulation of Final Ice Lens in Frost Heave of Saturated Soils

基于水热耦合分离冰冻胀模型对饱和颗粒土冻胀过程中形成的末透镜体进行数值计算研究。结果表明:常压条件下,饱和粉质黏土冻胀末透镜体厚度随时间呈抛物线增长,末透镜体平均分凝速率随上覆荷载增大而线性减小;高压条件下,饱和粉质黏土、黄黏土末透镜体厚度均随上覆荷载增大呈指数规律减小,当上覆荷载达到800kPa时,末透镜体厚度分别为0.26,0.17mm,无明显冻胀量产生。

In this paper, based on separated ice model coupled heat and mass transfer, we do some re search in numerical simulation on the final ice lens in frost heave of saturated soils. The results show that, in condition of low overburden pressure, final ice lens thickness of saturated silty clay increased parabolically with time, the average segregation rate decreased linearly with the increase of overburden pressure. In condition of high overburden pressure, final ice lens thickness of saturated soils decreased exponentially with the increase of overburden pressure. When overburden pressure reaches 800 kPa, final ice lens thickness are onl clay, in other words, no signi 0.26 mm and 0.17 mm respectively in saturated silty clay and yellow cant amount of frost heave