Elastoplastic Constitutive Model Describing Dilatancy Behavior of Overconsolidated Clay
Publication: International Journal of Geomechanics
Volume 21, Issue 3
Abstract
Overconsolidated (OC) clay has a strong dilatancy property, which has a significant effect on ultimate strength and deformation. Compared with normal consolidated (NC) clay, OC clay tends to show a higher strength–stress ratio, lower shear shrinkage, and larger dilatancy, as well as strain hardening and softening. A unified hardening (UH) model is a simple and practical model to describe the stress–strain relationship of OC soil. However, the degree of overconsolidation has a direct effect on dilatancy, which is mainly demonstrated by: (1) the degree of overconsolidation is directly related to the phase transformation stress ratio (Mc) that corresponds to the occurrence of dilatancy. The greater the degree of overconsolidation, the smaller the Mc; and (2) the greater the degree of overconsolidation, the smaller the volume shrinkage strain and the larger the volume dilatancy strain. In a UH model, the stress ratio (η) of the phase transformation is a constant and its value is simplified to be equal to the stress ratio of the critical state (M). A UH model cannot be employed to reflect the fact that the Mc varies with the degree of overconsolidation. To overcome the previous problems, the Mc in the dilatancy equation will be expressed as a power function of the overconsolidation stress ratio parameter (R). To reflect the characteristics of large volume shear shrinkage of underconsolidated (UC) soil, the nonassociative flow rule will be adopted, and the shape of the yield surface modified by state parameters is a water drop surface and the plastic potential surface is an elliptic surface. The improved model could better reflect the double influence of the degree of overconsolidation on dilatancy characteristics.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China for young scholars (Grant No. 11402260). The department of housing and urban-rural development of science and technology plan projects under Grant No. 20151602420730018, and the Foundation of China Academy of Building Research under Grant Nos. 20141602336230036, 20141602330730038, and 20171602330710007.
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International Journal of Geomechanics
Volume 21 • Issue 3 • March 2021
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© 2021 American Society of Civil Engineers.
History
Received: Sep 26, 2019
Accepted: Oct 16, 2020
Published online: Jan 11, 2021
Published in print: Mar 1, 2021
Discussion open until: Jun 11, 2021
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