Slope Stability Evaluation Based on Shear Strength Reduction Method

Shanzhi Shu, Samuel D. Palmer, Les C. Banas

In the proceedings of: GeoManitoba 2012: 65th Canadian Geotechnical Conference

Session: T2B - Slope Stability

ABSTRACT: Shear strength reduction is a relatively new slope stability analysis procedure, based on numerical methods, that provides significant advantages over conventional limit equilibrium slope stability analyses. To investigate application of the procedure, example analyses were carried out for a river valley slope that could support a highway bridge crossing. The results of the shear strength reduction analyses were compared to a conventional limit equilibrium analysis previously conducted to demonstrate its applicability. The results of this work illustrated that the previous limit equilibrium analysis of the slope did not identify the most critical slip surface, which led to a higher factor of safety, and a lower back-analyzed strength of a critical weak layer in the slope subsurface profile.

RÉSUMÉ: réduction de la résistance du sol. n pont sur le North Saskatchewan River à Edmonton, Alberta, est analysé en utilisant la méthode de réduction de la résistance du sol. Cette pente a déjà été analysée avec des méthodes conventionnelles. La nouvelle analyse a permit de trouver une nouvelle surface de glissement. A « back analysis » avec cette surface a donné lieu une plus grande résistance pour le

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