Three-Dimensional Effects for Supported Excavations in Clay
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 1
Abstract
This paper presents the results of 150 finite-element simulations conducted to define the effects of excavation geometry, i.e., length, width, and depth of excavation, wall system stiffness, and factor of safety against basal heave on the three-dimensional ground movements caused by excavation through clays. The results of the analyses are represented by the plane strain ratio (PSR), defined as the maximum movement in the center of an excavation wall computed by three-dimensional analyses normalized by that computed by a plane strain simulation. A simple equation for PSR is presented based on excavation geometry, wall system stiffness, and factor of safety against basal heave. This PSR equation reasonably represents trends in results of the 150 simulations as well as those simulations reported in literature. When the excavated length normalized by the excavated depth of an excavation wall is greater than 6, results of plane strain simulations yield the same displacements in the center of that wall as those computed by a three-dimensional simulation.
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Acknowledgments
Financial support for this work was provided by National Science Foundation Grant No. NSFCMS-0219123 and the Infrastructure Technology Institute (ITI) of Northwestern University. The support of Dr. Richard Fragaszy, program director at NSF, and Mr. David Schulz, ITI’s director, is greatly appreciated.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 133 • Issue 1 • January 2007
Pages: 30 - 36
Copyright
© 2007 ASCE.
History
Received: Feb 28, 2006
Accepted: Jul 28, 2006
Published online: Jan 1, 2007
Published in print: Jan 2007
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