Static Instability and Liquefaction of Loose Fine Sandy Slopes
Publication: Journal of Geotechnical Engineering
Volume 118, Issue 1
Abstract
Soils that exhibit nonassociated flow may, according to stability postulates by Drucker and by Hill, become unstable when exposed to certain stress paths inside the failure surface. Series of conventional triaxial tests on fully saturated and on partly saturated specimens were performed under drained and undrained conditions to study the regions of stable and unstable behavior. For specimens that compress and have degrees of saturation higher than critical, undrained conditions lead to effective stress paths directed within the region of potential instability, and instability was observed provided the yield surface opens up in the outward direction of the hydrostatic axis. Thus, instability occurs inside the failure surface. Instability is not synonymous with failure, although both may lead to catastrophic events. The location of the instability line is discussed. Examples of a shallow submarine slope and a nearly fully saturated steeper slope representing a tailings dam, which both should remain stable according to conventional stability analyses, are presented to show that they could become unstable due to small disturbances and proceed to fail catastrophically.
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Information & Authors
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Published In
Journal of Geotechnical Engineering
Volume 118 • Issue 1 • January 1992
Pages: 51 - 71
Copyright
Copyright © 1992 ASCE.
History
Published online: Jan 1, 1992
Published in print: Jan 1992
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