抄録
The ground that supports the structures is generally composed of complex soil structures, such as a fluid saturated soil layer, a pile reinforced ground, a laminated soil medium and a granular medium. It is of necessity to express real soil structures as the ground in detail in order to understand the presice ground behavior under strong earthquake motions. In this paper, such a complex ground is assumed to consist of two phase medium, for which the mixture theory is applied. The ground is idealized as two mono-phase medium which the ground composed and coupling phase between them by the mixture theory. It simply describes the complexity of the ground structure, interaction of two phase medium and micro-macro behavior, compared with earlier previous theories.
