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A micromechanics-based constitutive law for saturated swelling clays: the role of the osmotic pressure

type de publication      communication internationale avec actes publiés
date de publication 2005
auteur(s) Dormieux Luc; Lemarchand Eric
conférence Third Biot Conference on Poromechanics
     dates de 24-05-2005 à 27-05-2005
     lieu University of Oklahoma, Norman, Oklahoma, USA
     nom des actes Poromechanics III, Proceedings of the 3rd Biot Conference on Poromechanics, Balkema Publishers
pages 773 – 779
ISBN / ISSN 04-1538-041-3
résumé The swelling phenomenon in saturated clays of the smectite group is due to repulsive forces of electrostatic origin between elementary clay platelets. The present communication proposes a micromechanical approach in order to relate the homogenized elastic properties to this electrostatic interaction. First, the case of parallel platelets is considered. The bulk and shear moduli of an isotropic distribution of macropores and clay particles made up of parallel platelets are then derived in the framework of a self-consistent approach. Analytical expressions of the latter are given as functions of the nano- and macroporosities, and of the swelling pressure.
mots clés swelling clays, osmotic pressure, self-consistent scheme
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