Dilatancy relation for overconsolidated clay

Gao, Z. , Zhao, J. and Yin, Z.-Y. (2017) Dilatancy relation for overconsolidated clay. International Journal of Geomechanics, 17(5), (doi:10.1061/(ASCE)GM.1943-5622.0000793)

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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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gao, Dr Zhiwei
Authors: Gao, Z., Zhao, J., and Yin, Z.-Y.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:International Journal of Geomechanics
Publisher:American Society of Civil Engineers
ISSN:1532-3641
ISSN (Online):1943-5622
Published Online:14 October 2016
Copyright Holders:Copyright © 2016 American Society of Civil Engineers
First Published:First published in International Journal of Geomechanics 2016
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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