Dilatancy Relation for Overconsolidated Clay
Publication: International Journal of Geomechanics
Volume 17, Issue 5
Abstract
A distinct feature of overconsolidated (OC) clays is that their dilatancy behavior is dependent on the degree of overconsolidation. Typically, a heavily OC clay shows volume expansion, whereas a lightly OC clay exhibits volume contraction when subjected to shear. Proper characterization of the stress-dilatancy behavior proves to be important for constitutive modeling of OC clays. This paper presents a dilatancy relation in conjunction with a bounding surface or subloading surface model to simulate the behavior of OC clays. At the same stress ratio, the proposed relation can reasonably capture the relatively more dilative response for clay with a higher overconsolidation ratio (OCR). It may recover to the dilatancy relation of a modified Cam-clay (MCC) model when the soil becomes normally consolidated (NC). A demonstrative example is shown by integrating the dilatancy relation into a bounding surface model. With only three extra parameters in addition to those in the MCC model, the new model and the proposed dilatancy relation provide good predictions on the behavior of OC clay compared with experimental data.
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Acknowledgments
This work was supported by a Collaborative Research Fund (C6012-15G) of the Research Grants Council of Hong Kong. The first author would like to acknowledge the financial support from Innovate UK and QTS Group Ltd. through a Knowledge Transfer Project (Project No. KTP 9880). The third author would like to acknowledge the support from the Region Pays de la Loire of France (Project RI-ADAPTCLIM) and the European Project CREEP (PIAPP-GA-2011-286397).
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© 2016 American Society of Civil Engineers.
History
Received: Aug 21, 2014
Accepted: Jul 26, 2016
Published online: Oct 14, 2016
Discussion open until: Mar 14, 2017
Published in print: May 1, 2017
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