Shear Strength and Stability of Manmade Slopes

by Awtar Singh, (M.ASCE), Asst. Prof.; School of Engrg. and Appl. Sci., Univ. of Calfornia, Los Angeles, CA,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1970, Vol. 96, Issue 6, Pg. 1879-1892

Document Type: Journal Paper


A new method of graphically expressing slope stability analysis in which equal Factor of Safety contours are drawn for a given slope for all values of angle of internal friction and cohesion intercept of the slope material is presented herein. This greatly facilitates the study of the effect of soil strength variation on the stability of such slopes. Recognizing the variability in the values of shear strength parameters due to testing techniques, moisture content changes and the heterogeneity of the soil, it is shown that the choice of strength parameters overrides the choice of the method of slope stability computation. Procedures are outlined for optimum economical design of a slope and also for bedding plane failure analysis in multilayered system. Stability charts for balanced factor of safety for manmade slope with b horizontal to 1 vertical for b = 0.5, 0.75, 1.0, 1.5, 2.0, 2.5 and 3.0 are included for all practical value of shear strength parameters. The same charts can be used for cases when a relatively higher margin of safety is required in cohesion or in friction.

Subject Headings: Shear strength | Soil strength | Safety | Parameters (statistics) | Failure analysis | Slope stability | Friction | Soil stabilization

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