A constitutive thermomechanical model for saturated clays

摘要: Abstract The structural deformation in clays results from microscopic phenomena involving the mechanical contact-stress change, physico-chemical variation of repulsive forces expansive clays, and thermal dilatancy macropores. These textural strains are associated to three plastic mechanisms represented by respectively yield surfaces f Tm , R-A T . Under a cycle, sizes interlamellar spaces between clay platelets not modified, hence temperature cycle is expected have no effect on thus second mechanism affected changes. This paper suggests formulation model thermo-elasto-plastic behaviour non-expansive saturated characterised two mechanisms. surface based modified cam-clay model; softening plane separating domains. In normally consolidated conditions, resulting response an increase compressive. However, highly overconsolidated small irreversible dilative volumetric strain observed when above threshold value. intermediate material starts with expansion tends compression. constitutive combines thermo-mechanical hardening, predominant states (NCS) absent (OCS) where occurs. characterisation requires information about rheological parameters obtained oedometric triaxial paths. Lastly, some numerical simulations tests remoulded Boom, ‘Bassin Parisien’ Pontida presented, which show satisfactory agreement experiments predictions.