Static Shear and Liquefaction Potential

by Yoginder P. Vaid, Univ. of British Columbia, Vancouver, British Columbia, Cananda; formerly, Assoc. Prof. of Civ. Engrg. and Engrg. Mechanics, Hamilton, Ontario, Canada,
W. D. Liam Finn, (M.ASCE), Prof. of Civ. Engrg.; Univ. of British Columbia, Vancouver, B.C., Canada,

Serial Information: Journal of the Geotechnical Engineering Division, 1979, Vol. 105, Issue 10, Pg. 1233-1246

Document Type: Journal Paper


The influence of initial static shear on undrained cyclic loading behavior of saturated Ottawa sand has been studied using the new constant volume simple shear test together with improved sample preparation techniques. The generally held belief that increasing the level of static shear stress on horizontal planes progressively increases the resistance of sand to straining or liquefaction, as measured by the amplitude of cyclic stress, was not always found to be applicable. This resistance was found to increase, decrease or remain unaltered with increase in static shear stress depending on factors such as relative density, shear strain level of interest and the magnitude of static shear stress. However, if the cyclic loading resistance was measured in terms of the amplitude of the maximum shear stress during cyclic loading, an increase in resistance with increasing static shear stress was always noted, irrespective of the relative density or shear strain level of interest.

Subject Headings: Shear stress | Shear resistance | Shear tests | Load and resistance factor design | Cyclic loads | Load tests | Statics (mechanics) | Soil liquefaction

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