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在已有的非饱和土水-力耦合模型基础上,耦合考虑温度影响,建立了一个热-水-力耦合作用下非饱和土弹塑性本构模型。该模型以土骨架平均应力、修正吸力和温度为应力状态变量,以土骨架应变、饱和度和熵为应变状态变量。通过引入与温度相关的屈服面(LY、TY)以及相应的硬化规律来考虑温度对土体变形的影响。利用建立的模型,对文献中不同吸力和温度条件下的等向压缩和三轴排水剪切试验进行预测,预测结果表明,该模型能够较好地定量描述热-水-力耦合作用下非饱和土的变形特性。
Based on the existing water-soil coupling model of unsaturated soil, a coupled elasto-plastic constitutive model of unsaturated soil under coupled thermo-hydro-mechanical coupling is established considering coupling of temperature. The model takes the average soil frame stress, the modified suction and the temperature as the stress state variables, and takes the soil frame strain, saturation and entropy as the strain state variables. The effect of temperature on soil deformation is taken into account by introducing the temperature-dependent yield surface (LY, TY) and the corresponding hardening law. The established model is used to predict isotropic compression and triaxial drainage shear tests under different suction and temperature conditions in the literature. The prediction results show that the model can be used to quantitatively describe the non-saturation of thermo-hydro-mechanical coupling Soil deformation characteristics.