STUDY ON DYNAMIC CHARACTERISTICS OF ALLUVIAL MEDIA BY USING THEORY OF AGGREGATE BODY : (Part 2) Influence of dynamical coupling effects of pore water on ground compliance of rectangular foundation due to vertical excitation

Abstract

This paper describes a theoretical study concerning soil-structure dynamic interaction problems on an alluvial medium. The dynamical characteristics of a poroelastic half space are investigated using an analytical model based on theory of aggregate body. There are some permeability ranges which are unable to be qualitatively explained explained by behaviors of both perfectly elastic body and Voigt-type viscoelastic one simulated by using the characteristics of the body waves traveling in the aggregate body. The value of imaginary part of Dynamical Ground Compliance corresponding to radiation energy through a sub-soil ground, is large in high permeability range, on the other hand, it becomes small in low permeability range, because the relative particle velocities between the porous elastic body and the pore water decreases in this range.