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Compacted expansive clays are often considered as a possible buffer materialin high-level deep radioactive waste disposals. After the installation of wastecanisters, the engineered clay barriers are subjected tothermo-hydro-mechanical actions in the form of water infiltration from thegeological barrier, heat dissipation from the radioactive waste canisters, andstresses generated by clay swelling under almost confined conditions. The aimof the present work is to develop a constitutive model that is able to describethe behaviour of compacted expansive clays under these coupledthermo-hydro-mechanical actions. The proposed model is based on two existingmodels: one for the hydro-mechanical behaviour of compacted expansive clays andanother for the thermo-mechanical behaviour of saturated clays. The elaboratedmodel has been validated using the thermo-hydro-mechanical test results on thecompacted MX80 bentonite. Comparison between the model prediction and theexperimental data show that this model is able to reproduce the main featuresof volume changes: heating at constant suction and pressure induces eitherexpansion or contraction; the mean yield stress changes with variations ofsuction or temperature.

Modelling the thermo-mechanical volume change behaviour of compacted expansive clays