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。

This paper presents an elastoplastic constitutive model unifying thermo-hydro-mechanical modeling for unsaturated soils. It is based on existing hydro-mechanical models of unsaturated soils and experimental evidence of temperature effects on soils. The average soil skeleton stress, modified suction and temperature are selected as stress variables, while the soil skeleton strain, saturation and entropy are selected as strain variables. LY and TY yield surfaces and the hardening laws are adopted for simulating temperature effects on volume change. The predictions are performed on the test results in literature including the isotropic compression tests and triaxial shear tests under different net stresses, suctions and temperatures. The comparisons between measured and predicted results indicate that the proposed model can quantitatively predict the volume change behaviour of unsaturated soils under thermo-hydro-mechanical coupling conditions.