Instability of Slopes with Nonassociated Flow

by Poul V. Lade, Univ of California, Los Angeles, United States,

Document Type: Proceeding Paper

Part of: Engineering Mechanics


Experimental investigations of the conditions for instability have shown that granular materials may become unstable inside the failure surface. For states of stress below the failure surface and above the instability line, loose granular soils may exhibit 'spontaneous' instability in response to transition from drained to undrained conditions. An example of a submarine slope, which should have remained stable according to conventional stability analyses, is presented to show that it could become unstable due to small disturbances and proceed to fail catastrophically.

Subject Headings: Slopes | Granular soils | Fluid flow | Material failures | Soil stress | Soil classification | Forensic engineering | Surface drainage

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