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ABSTRACT
Research interest in the thermo-mechanical behaviour of soils is growing as a result of an increasing number of geomechanical problems involving thermal effects. It is, therefore, necessary to understand thermally induced effects on soils and then to use the appropriate constitutive models for the numerical simulation of such phenomena. This paper addresses various issues concerning the thermo-mechanical behaviour of soils. Starting from experimental evidence of non-linearity and hardening that heating causes in soils, thermodynamic considerations are then introduced for the derivation and the discussion of the general form of the constitutive equations. After that, constitutive modelling is presented and treated in the context of elasto-plasticity based on the LTVP model, which includes the evolution of yield surfaces with temperature. Numerical simulations support the theoretical aspects of the paper by showing performances of this constitutive law, especially for undrained and cyclic paths.