Single Hardening Elasto-Plastic Model for Kaolin Clay with Loading-History-Dependent Plastic Potential Function
Publication: International Journal of Geomechanics
Volume 6, Issue 1
Abstract
The effect of principal stress rotation on the mechanical behavior of Kaolin clay is investigated using combined axial-torsional tests on hollow cylindrical specimens. The yielding behavior and failure criteria are found to be strongly dependent on the principal stress rotation angle and plastic work. A unique plastic potential function determined solely by the current stress state is not sufficient to model the plastic flow observed in these experiments. Therefore, a single hardening elasto-plastic model that includes a loading-history-dependent plastic potential function is proposed for normally consolidated Kaolin clay subjected to principal stress rotation. A general methodology for incorporating history dependency in modeling complex elasto-plastic behavior of cohesive soils is presented along with comparisons of model predictions with experimental data.
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Acknowledgments
Financial support from the National Science Foundation (NSF) through Grant Nos. NSFCMS 9872618 and NSFCMS-0296111 is gratefully acknowledged. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of NSF.
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© 2006 ASCE.
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Received: Nov 20, 2003
Accepted: Mar 11, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
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