Model Prediction of Static Liquefaction: Influence of the Initial State on Potential Instabilities
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 3
Abstract
This paper examines the influence of the initial state of sands on the potential for undrained instability. The main goal is to illustrate how advanced constitutive modeling of sand behavior can be used to evaluate the susceptibility for static liquefaction. The methodology is based on the concept of latent instability, in which the potential for collapse is contingent on particular boundary conditions. A generalized effective stress soil model, MIT-S1, is used to support the analysis and is combined with a theoretical approach for identifying loss of control owing to undrained shear perturbations. The theory is evaluated using experimental evidence available for Toyoura sand to point out the key role of void ratio and consolidation history and to provide experimental validation for the theory. Model predictions are then used to disclose the subtle role of drained preloading paths in promoting liquefaction instabilities. The ability of the constitutive model to reproduce the interplay between undrained kinematic constraints and material failure is fundamental in predicting potential instabilities arising from changes in drainage conditions. The examples shed light on the mechanics of static liquefaction and set a framework for applying the principles of material stability to the triggering analysis of flow slides induced by undrained shear perturbations.
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Acknowledgments
The first author gratefully acknowledges the Rocca Fellowship program, which provided support for his research studies at MIT. The authors are also grateful to Professor Roberto Nova for useful suggestions during the editing of the paper and to anonymous reviewers for their thoughtful comments.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 139 • Issue 3 • March 2013
Pages: 420 - 432
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 18, 2011
Accepted: May 17, 2012
Published online: Feb 15, 2013
Published in print: Mar 1, 2013
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