Pseudostatic Coefficient for Use in Simplified Seismic Slope Stability Evaluation
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 9
Abstract
Pseudostatic slope stability procedures are commonly used in engineering practice. However, the selection of the seismic coefficient employed in the analysis is often based on precedence without due consideration of the amount of seismic displacement that constitutes satisfactory performance for each particular project and without incorporating the vastly different seismic exposure for sites around the world. In this Note, a rational basis for selecting the seismic coefficient is presented. The proposed procedure requires that the engineer establishes the project-specific allowable level of seismic displacement. The seismic response characteristics of the slope are represented by the fundamental period of the potential sliding mass, and the site-dependent seismic demand is characterized by the 5% damped elastic design spectral acceleration at the degraded period of the potential sliding mass. The level of uncertainty in the estimates of the seismic demand and displacement can be handled through the use of different percentile estimates of these values. With the proposed equations, the engineer can properly incorporate the amount of seismic displacement judged to be allowable and the seismic hazard at the site in the selection of the seismic coefficient.
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Acknowledgments
Support for this work was provided by the Earthquake Engineering Research Centers Program of the National Science Foundation under Award No. NSFEEC-2162000 through the Pacific Earthquake Engineering Research Center (PEER) under Award Nos. UNSPECIFIEDNC5216 and UNSPECIFIEDNC7236.
References
Abrahamson, N., et al. (2008). “Comparisons of the NGA ground-motion relations.” Earthquake Spectra, 24(1), 45–66.
Bray, J. D. (2007). “Chapter 14: Simplified seismic slope displacement procedures.” Proc., Earthquake Geotechnical Engineering, 4th Int. Conf. on Earthquake Geotechnical Engineering—Invited Lectures,K. D. Pitilakis, ed., Vol. 6, Springer, New York, 327–353.
Bray, J. D., and Rathje, E. R. (1998). “Earthquake-induced displacements of solid-waste landfills.” J. Geotech. Geoenviron. Eng., 124(3), 242–253.
Bray, J. D., and Travasarou, T. (2007). “Simplified procedure for estimating earthquake-induced deviatoric slope displacements.” J. Geotech. Geoenviron. Eng., 133(4), 381–392.
Hynes-Griffin, M. E., and Franklin, A. G. (1984). “Rationalizing the seismic coefficient method.” Rep. No. GL-84–13, U.S. Army Engineers Waterways Experiment Station, Vicksburg, Miss.
Newmark, N. M. (1965). “Effects of earthquakes on dams and embankments.” Geotechnique, 15(2), 139–160.
Seed, H. B. (1979). “Considerations in the earthquake-resistant design of earth and rockfill dams.” Geotechnique, 29(3), 215–263.
Stewart, J. P., Blake, T. F., and Hollingsworth, R. A. (2003). “A screen analysis procedure for seismic slope stability.” Earthquake Spectra, 19(3), 697–712.
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© 2009 ASCE.
History
Received: Jun 17, 2008
Accepted: Dec 31, 2008
Published online: Aug 14, 2009
Published in print: Sep 2009
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