DYNAMIC BEHAVIOR OF PILE FOUNDATIONS IN HOMOGENEOUS AND NONHOMOGENEOUS MEDIA

A three-dimensional formulation based on Green's functions of cylindri cal loads in layered semi-infinite media is employed to investigate th e dynamic behaviour of piles in homogeneous and non-homogeneous half s paces. The pile-soil-pile interaction taking place in pile groups is i ncorporated in the model. The results presented in this paper include the dynamic stiffnesses and dampings of single piles as well as those of representative 2 x 2 and 4 x 4 square pile groups in the soil media considered in this study. In addition, the distribution of forces app lied on the pile cap among the individual piles in a group is investig ated.