Anomalies in Pseudostatic Seismic Stability Analysis
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VIEW THE REPLYAuthors: John T. Christian, Dist.M.ASCE [email protected], and Alfredo Urzúa, M.ASCE [email protected]Author Affiliations
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 5
Abstract
Slopes in soil and rock are often defined in terms of their static and pseudostatic factors of safety. For the case of sliding along a single plane, a simple equation relates the pseudostatic factor of safety to the static factor of safety, the slope of the failure plane, and the friction angle for the single plane model and gives remarkably accurate estimates for more complicated analyses. A further result is that the horizontal seismic coefficient necessary to bring the pseudostatic factor of safety to 1.0 increases as the slope of the failure plane increases. This result is counterintuitive, but it arises because of the complicated interactions among the parameters defining the factors of safety.
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References
Slope 7.0 [Computer software]. Rocscience, Inc., Toronto.
Taylor, D. W. (1937). “Stability of earth slopes.” J. Boston Soc. Civ. Eng., 24(3), 337–386.
Taylor, D. W. (1948). Fundamentals of soil mechanics, Wiley, New York, 459.
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©2017 American Society of Civil Engineers.
History
Received: Dec 6, 2015
Accepted: Oct 25, 2016
Published ahead of print: Jan 23, 2017
Published online: Jan 24, 2017
Published in print: May 1, 2017
Discussion open until: Jun 24, 2017
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Professor, Dept. of Civil and Environmental Engineering, Univ. of Massachusetts, Lowell, One University Ave., Lowell, MA 01854; Prototype Engineering, Inc., 57 Westland Ave., Winchester, MA 01890 (corresponding author). E-mail: [email protected]
Principal, Prototype Engineering, Inc., 57 Westland Ave., Winchester, MA 01890. E-mail: [email protected]
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