Comparison study of constitutive models for overconsolidated clays

Wan, Z., Yao, Y. and Gao, Z. (2020) Comparison study of constitutive models for overconsolidated clays. Acta Mechanica Solida Sinica, 33, pp. 98-120. (doi: 10.1007/s10338-019-00110-w)

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Widely distributed in natural deposits, the overconsolidated (OC) clays have attracted extensive experimental investigations on their mechanical behaviors, especially in the 1960s and 1970s. Based on these results, numerous constitutive models have also been established. These models generally fall into two categories: one based on the classical plasticity theory and the other the bounding surface (BS) plasticity theory, with the latter being more popular and successful. The BS concept and the subloading surface (SS) concept are the two major BS plasticity theories. The features of these two concepts and the representative models based on them are introduced, respectively. The unified hardening (UH) model for OC clays is also based on the BS plasticity theory but distinguishes itself from other models by the integration of the reference yield surface, unified hardening parameter, potential failure stress ratio, and transformed stress tensor. Modification is made to the Hvorslev envelop employed in the UH model to improve its capability of describing the behaviors of clays with extremely high overconsolidation ratio in this paper. The comparison among the BS model, SS model, and UH model is performed. Evidence shows that all these three models can characterize the fundamental behaviors of OC clays, such as the stress dilatancy, strain softening and attainment of the critical state. The UH model with the revised Hvorslev envelop has the fewest parameters which are identical to those of the modified Cam-Clay model.

Item Type:Articles
Additional Information:This study was supported by the National Natural Science Foundation of China for young scholars (Grant No. 11402260).
Keywords:Clay, Overconsolidation, Critical state, Bounding surface, Subloading surface, Unified hardening model
Glasgow Author(s) Enlighten ID:Gao, Dr Zhiwei
Authors: Wan, Z., Yao, Y., and Gao, Z.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Acta Mechanica Solida Sinica
ISSN (Online):1860-2134
Published Online:02 July 2019
Copyright Holders:Copyright © The Chinese Society of Theoretical and Applied Mechanics 2019
First Published:First published in Acta Mechanica Solida Sinica 33:98-120
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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