Endochronic Modeling for Cyclic Behavior of Overconsolidated Clays

Abstract

ABSTRACT The constitutive relations based on the endochronic theory have been presented to describe the behavior of overconsolidated clay subjected to cyclic loading. The proposed constitutive law is capable of describing (a) strain softening and hardening, including a softening steady state which is eventually reached as the number of cycles increases; (b) densification and dilatancy; (c) effect of effective confining pressure; (d) effect of overconsolidation ratio OCR. The model is applied to describe the strain-controlled cyclic undrained triaxial test data on Shanghai clay carried out by the second author and strain-controlled undrained simple shear test data on Drammen clay (Andersen et al., 1980). The comparison between the theoretical prediction and the test data shows that the presently proposed model provides a reasonable description for the clay under consideration.