1 PhD Eng., Faculty of Civil Engineering, Warsaw University of Technology, Warszawa, Poland, Department of Roads and Bridges/Institute of Geoengineering and Underground Structures, 00-637 Warszawa, al. Armii Ludowej 16
2 Prof. PhD Eng., Ecole Nationale des Travaux Publics de l’Etat, LGM/DGCB CNRS
This study deals with the behavior of composite blends constituted of rigid and impervious grains included in saturated clay paste of kaolin, considered as permeable and deformable. Permeability tests performed during standard oedometr tests (before each load step) highlight the key role of the original and actual state of the clay paste, and show the existence of a threshold of sand grain concentration above which a structuring effect influences its permeability. In the light of these experiments some usual homogenization methods (with simplifying assumptions to make the problem manageable) are considered in order to model the mixture permeability. Qualitative and quantitative comparisons with experimental data point out their respective domain of interest and limitations of such approaches
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