Reduction of angle of internal friction with increasing stress level of sandy soil is widely recognized and noticed by many researchers. There are limited studies on the effect of this reduction on bearing capacity of piles. This book presents a study of the effect of this reduction on axially loaded bored piles embedded in dense and medium sand by using finite element approach. The soil modeled using a hyperbolic soil model with an empirical equation to account for the reduction of angle of internal friction with increasing stress level while the concrete bored pile modeled as a linear...