BASIC FORMULATION OF STATIC AND DYNAMIC BEHAVIOURS OF SOIL AND OTHER POROUS MEDIA

This paper treats the soil and rock or concrete as a two-phasemedium composed of a solid skeleton and an interstitial fluid.Un-der the unsaturated condition of interstitial fluid,the thirdphase is taken into consideration. In this paper. we consider theconstitutive relation,dynamic and kinematic relations,and also va-rious approximations with their limits of validity.including thoseof most practical engineering situations such as the consolidationproblem and the undrained behaviour. The finite element discreti-zation and the time dependent solution of various classes of soilproblem are also discussed.