Experimental Test of the validity of "Isotropic" Approximation for the Mechanical Behaviour of Clay
M. Hattab : LPMM/ISGMP,UMR 7554 CNRS, Université de Metz, île de Saulcy, 57045 METZ cedex 01, France, email@example.com
Abstract: Experimental data from axially symmetric compression test at constant mean pressure p=(s1+s2+s3)/3 on kaolinite clay are used to study the validity of an "isotropic" modelling as a function of the over-consolidation ratio (OCR).The isotropic assumption is found to be quite good for 2<OCR<3 and/or in the range of small deformation for OCR>4. For very large OCR (OCR >10), anisotropic response is observed at few percents axial deformation. Relation with anisotropic distribution of local force is made.