Unified anisotropic elastoplastic model for sand

Zhao, J. and Gao, Z. (2016) Unified anisotropic elastoplastic model for sand. Journal of Engineering Mechanics, 142(1), 04015056. (doi:10.1061/(ASCE)EM.1943-7889.0000962)

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Abstract

This paper presents a unified approach to model the influence of fabric anisotropy and its evolution on both the elastic and plastic responses of sand. A physically based fabric tensor is employed to characterize the anisotropic internal structure of sand. It is incorporated into the nonlinear elastic stiffness tensor to describe anisotropic elasticity, and is further included explicitly in the yield function, the dilatancy relation, and the flow rule to characterize the anisotropic plastic sand response. The physical change of fabric with loading is described by a fabric evolution law driven by plastic strain, which influences both the elastic and the plastic sand behavior. The proposed model furnishes a comprehensive consideration of both anisotropic elasticity and anisotropic plasticity, particularly the nonlinear change of elastic stiffness with the evolution of fabric during the plastic deformation of sand. It offers a natural and rational way to capture the noncoaxial behavior in sand caused by anisotropy. It also facilitates easy determination of the initial anisotropy in sand based on simple laboratory tests and avoids the various arbitrary assumptions on its value made by many previous studies. The model predictions on sand behavior compare well with test data.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gao, Dr Zhiwei
Authors: Zhao, J., and Gao, Z.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Journal of Engineering Mechanics
Publisher:American Society of Civil Engineers
ISSN:0733-9399
ISSN (Online):1943-7889
Copyright Holders:Copyright © 2015 ASCE
First Published:First published in Journal of Engineering Mechanics 2015
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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