Elastic-Viscoplastic Model for Clays: Development, Validation, and Application
Publication: Journal of Engineering Mechanics
Volume 143, Issue 10
Abstract
This paper presents an elastic-viscoplastic (EVP) constitutive model in triaxial space and general stress space for isotropic clays. The EVP model is anchored in bounding surface theory along with the mapping rule and adopts a critical-state soil mechanics framework. It incorporates creep effects, and a nonlinear creep function is used in the model. The EVP deformation of clay is integrated considering a reference surface and loading surface. An image parameter is deduced to establish the image surface. The strain-rate tensor of the model contains an elastic-strain-rate tensor and viscoplastic-strain-rate tensor. The model formulation is capable of accounting for composite as well as single-surface ellipses. Parameters of the model can be extracted from conventional oedometer and triaxial tests. The model performance is validated by capturing the behaviors in creep tests, relaxation tests, strain-rate effect tests, and overconsolidation ratio effect tests on Kaolin clay, Hong Kong Marine Deposit clay, and Fukakusa clay. The model is also implemented in a finite-element (FE) code and used to predict the long-term performance of the Nerang Broadbeach Roadway embankment constructed in Australia. The long-term settlement prediction of this embankment is also compared with that obtained from the modified Cam clay (MCC) model. Pertinent details of the theoretical framework of the proposed EVP model along with its validation, FE implementation, and field application are discussed in this paper.
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Acknowledgments
The first author was supported by the Tuition Fee Scholarship (TFS) while conducting his Doctoral research at UNSW, Canberra, Australia. Also, the authors wish to express their gratitude to Dr. Rajibul Karim, former Ph.D. student, UNSW, Canberra, for his valuable comments and discussions.
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Mar 7, 2016
Accepted: May 1, 2017
Published online: Aug 4, 2017
Published in print: Oct 1, 2017
Discussion open until: Jan 4, 2018
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