Improved subloading thermo-viscoplastic model for soil under strictly isotropic conditions

This paper presents a thermo-viscoplastic subloading soil model with a mobile centre of homothety. The model is formulated to describe the influence of non-isothermal conditions on the stress-strain-time behaviour of soils and is restricted to isotropic stress and strain conditions. Numerical simulations of three isotropic drained heating tests, two of which followed by a cooling stage, at constant isotropic effective stress for different overconsolidation ratios were performed. The model was able to accurately reproduce the experimental results, including the cooling behaviour, mainly due to the introduction of a direct influence of temperature on the mobile centre of homothety hardening law and also rate dependency.