Earthquake Stability of Cohesive Slopes

by W. D. Liam Finn,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1966, Vol. 92, Issue 1, Pg. 1-12

Document Type: Journal Paper

Abstract: The earthquake stability of a long cohesive slope is examined with regard to the effect of shear strain rate on shearing resistance. The slope is assumed to be underlain by an appreciably stiffer layer at a depth, h. The acceleration at which the slope begins to yield is shown to be a function of slope angle, soil strength and density, and the depth, h. When an acceleration greater than the yield acceleration acts on the slope, two distinct deformation patterns occur; a surface layer moves down the slope as a rigid body and between the surface layer and the stiff layer at depth, h, the soil undergoes plastic shearing deformation. Expressions are derived for the velocity and depth of the surface layer, and the velocity distribution in the plastic zone. Similar expressions are derived for slopes initially undergoing steady state creep. The meager experimental data available indicates the theoretical results are plausible.

Subject Headings: Shear resistance | Soil deformation | Velocity distribution | Earthquakes | Slope stability | Soil strength | Plastics

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