Abstract
This paper is concerned with the three-dimensional dynamics of group piles in layered soils with emphasis on the pile-soil-pile interaction. The analysis, based on the substructure technique, is made by the finite element method for piles and the Green function method for soils which makes use of the thin layer formulation. Points for investigation is placed on the pile head impedance function and their group effect. The engineering aspect is also addressed to compare the present solution with the current design formula with respect to the pile head spring constant.
