Conjugate Stress Approach for Rankine Seismic Active Earth Pressure in Cohesionless Soils
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 7
Abstract
The Rankine classic earth pressure solution has been expanded for the calculation of seismic earth pressure on rigid retaining walls supporting cohesionless backfill. The expanded solution is based on the conjugate stress concept, without employing any additional assumptions. A single formulation is used for static and pseudostatic seismic analyses of active conditions. The equation accounts for sloping backfill, as well as wall inclination, and can readily accommodate layered soil profiles and the presence of groundwater, which require tedious analysis in commonly used methods. A closed-form expression, as opposed to the constant value commonly used in practice, has been derived for the soil-wall friction angle as a function of the inertial forces and problem geometry for a given pseudostatic acceleration. Seismic lateral pressure increases with depth, and the point of application of the resultant is calculated based on stratigraphy. Comparison of the formulation with the widely used Mononobe-Okabe solution revealed a perfect match for the proposed predictions, provided the same soil-wall friction angle is used in both formulations.
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Acknowledgments
The authors gratefully acknowledge the support of the Defense Threat Reduction Agency, Grant No. HDTRA1-10-1-0049, and the National Science Foundation, Grant DGE 0741714.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 139 • Issue 7 • July 2013
Pages: 1205 - 1210
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 11, 2011
Accepted: Sep 6, 2012
Published online: Sep 8, 2012
Published in print: Jul 1, 2013
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