Abstract
A thermomechanical constitutive model for unsaturated clays is presented in this paper based on an existing model for saturated clays originally proposed by the authors. The saturated clay model was formulated in the framework of critical state soil mechanics and modified Cam-clay. The existing model has been generalised to simulate the experimentally observed behaviour of unsaturated clays by introducing Bishop’s stress and suction as independent stress parameters and modifying the hardening rule and yield criterion to take into account the role of suction. The number of modelling parameters was kept to a minimum, and they all have clear physical interpretations, to facilitate the usefulness of model for practical applications. A step‐by‐step procedure for parameter calibration is also described. The model was finally evaluated using a comprehensive set of experimental data for the thermomechanical behaviour of unsaturated soils. Based on the results, the model is able to simulate the principle aspects of thermomechanical behaviour of unsaturated clays in a good manner.
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