Abstract
The settlement behavior of both single piles and pile groups in clayey soil due to vertical loadings and ground settlements are studied theoretically. And the applicability of the theory to site phenomena and model experiments is discussed in thisreport and will be discussed in latter serial reports. The analytical method in this paper is one of the stress methods basically shown by D'apporonia and Romualdi (March 1963 A.S.C.E.) and authors generarized this method to more realized theory. Considering the "supernonlinerity" of stress-strain characteristics of soils, equations are developed using incremental quantities of pile forces and other variables. Assumptions used in introducing the fundamental equations are as follows. 1) Piles are usually considered elastically compressible but inelastic compressibility can be considered when it is necessary. 2) The constitutive relations of soils are based on the rheorogical model (Fig.3) proposed by authors. 3) Mindlin's 1st solutions are used as influence factors for true elastic behavior of the ground. But authors considered the existence of pile shaft and corrected the influence factors by solving the problem of half infinite elastic body having a bored hole the same as pile shaft by Finite Element Method. 4) Fundamental equations are not positive functions of time as the stationaly conditions are treated. The theoretical calculation results are in good agreement with observed data including small and large settlements by short or long term loading and their repetition, negative skin friction phenomena and so on.
