Time-Dependent Unified Hardening Model: Three-Dimensional Elastoviscoplastic Constitutive Model for Clays
Publication: Journal of Engineering Mechanics
Volume 141, Issue 6
Abstract
A new three-dimensional (3D) elastoviscoplastic (EVP) constitutive model for both normally consolidated and overconsolidated clays is presented. In developing the new model, first the time effects on clays were connected with the change of overconsolidation degree according to the concepts of aging time and the instant normal compression line. This made it convenient to combine a logarithmic creep function with the reloading function of the unified hardening (UH) model (a model for overconsolidated clays), and, thus, an isotropic EVP relationship was built. Second, a time variable derived from the isotropic EVP relationship was embedded into the current yield function of the UH model, and, thereby, a time-dependent current yield function is proposed. Based on the time-dependent current yield function and the flow rule, an EVP model for triaxial compression stress states was built. The EVP model for triaxial compression stress states then was extended to a 3D EVP model for general stress states through the transformed stress method. The proposed 3D EVP model can describe time-dependent behaviors, such as creep, relaxation, and loading rate effect, for both normally consolidated and overconsolidated clays, with two additional parameters compared with the modified Cam-clay model. Finally, numerous experimental results in the literature (such as the results of triaxial undrained creep tests, triaxial undrained compression and extension tests at the constant strain rate, and triaxial undrained tests at the stage-changed strain rate) were used to validate the new model.
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Acknowledgments
This study was supported by the National Program on Key Basic Research Project of China (973 Program, Grant 2014CB047001), the National Natural Science Foundation of China (Grants 11272031 and 51179003), the Beijing Natural Science Foundation (Grant 8132042), the Innovation Foundation of Beihang University for Ph.D. Graduates, the Australian Research Council (DE130101342 and DP140101547), and the Royal Melbourne Institute of Technology (RMIT) Foundation (IERF 2013).
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Published In
Journal of Engineering Mechanics
Volume 141 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 13, 2014
Accepted: Sep 29, 2014
Published online: Oct 23, 2014
Published in print: Jun 1, 2015
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