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Temperature significantly affects the mechanical properties of geomaterials, particularly the creep behavior of soft clayey soils. Thus, an appropriate constitutive model to describe the time-dependent stress-strain behavior of clayey soils at various temperatures is necessary. This study performed temperature-controlled oedometer tests on two clayey soils: the Hong Kong marine deposit (HKMD) and kaolinite clay. The thermally-induced strain and creep strain rates under different temperature paths were investigated and discussed. A novel onedimensional (1D) thermal elastic visco-plastic (TEVP) model was developed based on Yin and Graham's 1D elastic visco-plastic (EVP) model. In the proposed model, the visco-plastic strain rate of soils can be described using three state variables: effective stress, strain, and temperature.The proposed model can be implemented in creep analysis conveniently with the equivalent time concept. The prediction results of the TEVP model were consistent with the experimental data for HKMD and kaolin.

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