Thermomechanical behaviour of Boom clay

Special attention has been recently paid on temperature effects on the beha vior of deep saturated clays, in relation with nuclear deep waste storage. However, few experimental data are presently available, and existing consti tutive models need to be completed. This note is aimed at completing, both experimentally and theoretically, the understanding of the effects of the o verconsolidation ratio on the thermal volume changes of Boom clay (Belgium) . The experimental data obtained here are in a good agreement with existing data. As a complement to existing data, they are used to develop a new ela stoplastic model. The adoption of a second coupled plastic mechanism provid es good simulations on a complex thermo-mechanical path. (C) 2000 Academie des sciences/Editions scientifiques et medicales Elsevier SAS.