P. Evesque: Lab MSSM, UMR 8579 CNRS, Ecole Centrale Paris, 92295 Ch‚tenay-Malabry, France ,


Abstract:Amodelassumingincrementalplasticisotropicresponsehasbeenrecently proposedtomodelthe deformationofisotropicpackingofgrains,inthesmall-strainrange.Itisusedhereonover-consolidated remouldclay,tointerpretthesmall-strainrangebehaviourobtainedin[1,2]on Bangkokclay.The data published in [1,2] at constant volume are also used here to measure the size of the domain of validity in the (q/(Míp),p/po) plane, where po is the over-consolidation isotropic pressure, p=(s1+ s2+ s3)/3 is the mean stress and q the deviatoric stress, q= s1- s3 . So, it is shown that the model works also for clay. This enlarges the application domain of model [3,4] to soft clay with OCR larger than 1.2 to 1.5.

Pacs # : 45.70.-n ; 62.20.Fe ; 83.80.Fg, 83.80.Hj

poudres & grains 14 (1), 4-7 (janvier 2004)