New Stress Reduction Coefficient Relationship for Liquefaction Triggering Analyses
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 11
Abstract
Since its inception in the early 1970s, the stress-based simplified procedure has become the standard of practice worldwide for evaluating liquefaction triggering potential. Central to this procedure is the stress reduction coefficient, , which allows the estimation of the seismically induced stresses at depth in a soil profile without the need to perform a numerical site response analysis. Proposed herein is a new relationship that was developed from equivalent-linear site response analyses performed on soil profiles representative of those in the liquefaction case history databases. The input motions used in the analyses are representative of those from shallow crustal earthquakes. Two variants of the relationship are presented that allow it to be used when the profile’s shear-wave velocities are either known or unknown, with the former yielding values having less uncertainty. Additionally, calibration coefficients are provided for both active and stable continental tectonic regimes. In comparison with other relationships that are commonly used, the relationship proposed herein should yield values that have less bias and uncertainty.
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Acknowledgments
This study is based on work supported by the U.S. National Science Foundation (NSF) grants CMMI-1030564 and CMMI-1435494, and U.S. Army Engineer Research and Development Center (ERDC) grant W912HZ-13-C-0035. The authors gratefully acknowledge this funding. However, any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of NSF or ERDC.
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Information & Authors
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 142 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jun 6, 2015
Accepted: Mar 1, 2016
Published online: Jun 17, 2016
Published in print: Nov 1, 2016
Discussion open until: Nov 17, 2016
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