Strength Loss and Localization at Silt Interlayers in Slopes of Liquefied Sand
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 130, Issue 11
Abstract
The role of void redistribution in the liquefaction behavior of saturated sand slopes with and without silt interlayers was investigated using a series of dynamic centrifuge model tests. Twelve centrifuge model tests are described that represent four different simple slope configurations, a range of initial relative densities , and three different input motions with different sequences of application. These experimental results demonstrate that the potential for void redistribution induced shear localizations and slope instability depends on the sand’s initial , slope geometry (silt layer shape, sand layer thickness), and shaking characteristics (duration, intensity, and history). The archived experimental data set provides a good basis for assessing the ability of numerical modeling methods to distinguish between conditions leading to localization or not. Apparent residual shear strengths mobilized in the models were backcalculated using techniques common to practice. The experimental and analytical results demonstrate that the apparent residual shear strength is unlikely to correlate closely to pre-earthquake penetration resistance alone, but rather is a function of the initial shear stresses and numerous factors affecting the process of void redistribution and localization.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 130 • Issue 11 • November 2004
Pages: 1192 - 1202
Copyright
Copyright © 2004 ASCE.
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Published online: Oct 15, 2004
Published in print: Nov 2004
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