Centrifuge Study on Volume Changes and Dynamic Stability of Earth Dams
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Volume 119, Issue 11
Abstract
A simplified method of analysis for determining the permanent displacement of a clay core in a heterogeneous earth dam subjected to dynamic excitation is discussed. Centrifuge studies on three identical models were used to determine the deformation characteristics of earth dams subjected to earthquakes large enough to produce flow slides. These studies suggest that the failure mode is considerably influenced by the reduction in shear strength caused by the void‐ratio increase and the subsequent decrease in effective stress at the sand‐clay interface. Conventional sliding block analysis does not consider this phenomenon. A simplified method using the concepts of critical‐state soil mechanics is presented that may be used to estimate both the reduced shear strength and the redistributed void‐ratio at the interface. Values predicted using this method were found to agree well with those observed in the centrifuge experiments. By integrating these quantities into Newmark's sliding block analysis, a better estimate of the permanent displacement of an earth dam may be obtained.
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Published In
Journal of Geotechnical Engineering
Volume 119 • Issue 11 • November 1993
Pages: 1717 - 1731
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jun 18, 1990
Published online: Nov 1, 1993
Published in print: Nov 1993
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