MODIFIED DARCY LAW, TERZAGHI EFFECTIVE STRESS PRINCIPLE AND FICK LAW FOR SWELLING CLAY SOILS

Governing equations often used in soil mechanics and hydrology include the classical Darcy's law, Terzaghi's effective stress principle, and the classical Fick's first law, It is known that the classical forms of these relations apply only to non-swelling, granular materials. In this paper, we summarize recent generalizations of these results for s welling porous media obtained using hybrid mixture theory (HMT) by the authors, HMT is a methodical procedure for obtaining macroscopic cons titutive restrictions which are thermodynamically admissible by, explo iting the entropy inequality for spatially-averaged properties, HMT ap plied to the modeling of swelling clay particles, viewed as clusters o f adsorbed water and clay, minerals, produces additional terms necessa ry to account for the physico-chemical forces between the adsorbed wat er and clay minerals or, more generally,for swelling colloids, New dir ections for modeling consolidation of swelling clays are proposed base d on our view of clay particles as a two-phase system. (C) 1997 Elsevi er Science Ltd.