Lateral Resistance of a Full-Scale Pile Group in Liquefied Sand
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VIEW THE REPLYPublication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 131, Issue 1
Abstract
Lateral load test was performed on a full-scale pile group following blast-induced liquefaction to evaluate pile–soil–pile interaction effects. The pile group at 3.3 pile diameter spacing was driven into loose to medium dense sand. A single pile test was conducted for comparison. In contrast to preliquefaction tests, group interaction effects were insignificant after liquefaction. The lateral resistance of each pile in the group was similar and about the same as that for the single pile test. curves were developed based on the bending moment versus depth data for values of 95%. While the slope of curves for nonliquefied sand typically decreases with continued deflection, the slope of the backcalculated curves for liquefied sand increases with deflection. This phenomenon appears to be connected with load-induced dilation and a decrease in excess pore pressure locally around the pile. The curves stiffened with depth and as the excess pore pressure ratio decreased. Equations were developed for curves in liquefied sand which also account for the effect of variations in pile diameter.
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Acknowledgments
This project was supported by Departments of Transportation from the states of Alaska, California, Missouri, New York, Oregon, Utah, and Washington through a pooled-fund arrangement. Caltrans served as the lead agency with Tom Shantz as the Project Manager. This support is greatly appreciated. The views and recommendations expressed in this paper do not necessarily reflect the views of the sponsors. Foundation Constructors, Inc., and Condon–Johnson, Inc. donated foundation installation services and this support is gratefully acknowledged. Corporate contributions from URS Greiner Woodward Clyde provided support for analyses conducted by Dr. Gerber. The writers also thank the City of San Francisco and the U.S. Navy for allowing access to the site at Treasure Island.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 131 • Issue 1 • January 2005
Pages: 115 - 125
Copyright
© 2005 ASCE.
History
Received: Sep 17, 2003
Accepted: May 28, 2004
Published online: Jan 1, 2005
Published in print: Jan 2005
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