非饱和土的热-水力-力学本构模型及数值模拟

Constitutive model and numerical simulation of thermo-hydro-mechanical behavior in unsaturated soils

在CAP模型的基础上提出了一个非饱和土的热 -水力 -力学本构模型 ,着重考虑了温度对于非饱和土的水力 -力学性质的影响。基于实验结果和前人的工作 ,在模型中重现了热软化现象 ,计及了温度升高导致土壤前固结压力的降低和非饱和土吸力增加屈服线 (SI)中临界吸力值的降低。应用该模型进行了数值模拟计算 ,通过模拟结果和实验结果的比较 ,验证了模型的适用性和可靠性。

A thermo hydro mechanical constitutive model for unsaturated soils is proposed based on the existing CAP model for unsaturated soils. The influences of temperature on the hydro mechanical behaviour of unsaturated soils are described in the model. Particularly, the thermal softening phenomenon, i.e. decreases in value of the pre consolidation pressure and in critical value of the suction of the SI (Suction Increasing) curve with heating process, are quantitatively modelled by using the experimental data and previous work.Comparisons of the results obtained from the numerical modeling of the constitutive behaviour with existing experimental results show that the present model can simulate the thermo hydro mechanical behaviour of unsaturated soils satisfactorily.The versatility and applicability of the present constitutive model are proved by the numerical results given in this paper.