Abstract
Abstract The paper presents a relatively simple analysis of the performance of a pile in a layered system consisting of an upper layer of fill, a middle layer of sand, which may itself be layered, and a competent base layer which may or may not be permeable. At the elevation corresponding to the base of the loose sand layer the system is subjected to a seismic type excitation similar to what might be experienced in an earthquake. In fact the excitation used is this paper is the N-S component of the Loma Prieta 1989 earthquake as measured in the Diamond Heights recording station. The constitutive model used to analyze the middle sand layer(s) is the CANAsand model incorporating both concepts of Critical and Compact States.
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