Disturbed State Concept-Based Constitutive Model for Lignosulfonate-Treated Silty Sand
Publication: International Journal of Geomechanics
Volume 15, Issue 6
Abstract
In this paper, a new behavioral (plasticity) model for lignosulfonate (LS)–treated silty sand based on the disturbed state concept is proposed. Here, the relative intact (RI) responses for both the LS-treated and untreated soils are simulated using the version of the hierarchical single-surface plasticity models. The nonassociativeness is incorporated through the disturbance function, which shows the amount of deviation of the actual response from the reference states. In the analysis, the fully adjusted (FA) response of the untreated soil was considered similar to the shear behavior at 20% of the shear strain. Also, for the LS-treated behavior, the FA response was taken as the response of the LS bonds. In this study, the bond response was modeled separately using a linear elastic RI response and zero strength condition as the relative states. A series of laboratory direct shear tests were carried out at low effective normal stresses to determine the model parameters. The proposed model has been validated using an independent set of shear test results. The model predictions are in good agreement with the laboratory test data.
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Acknowledgments
The authors wish to express their gratitude to the Australian Research Council (ARC), to the Queensland Department of Transport and Main Roads (Brisbane), and to Robert Armstrong (Chemstab Consulting Pvt. Ltd., Wollongong) for providing financial support for this research. Professor Chandrakant Desai’s encouragement and his comments during the preparation of the manuscript through this ARC project are appreciated. The assistance with laboratory experiments given by the technical staff at University of Wollongong is gratefully acknowledged.
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International Journal of Geomechanics
Volume 15 • Issue 6 • December 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 22, 2014
Accepted: Nov 13, 2014
Published online: Mar 17, 2015
Discussion open until: Aug 17, 2015
Published in print: Dec 1, 2015
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