Parametric Study of Global Stability of Benched Earth Slopes

Hossein Ghiassian, Pedram Saffari, Fathi M. O. Mohamed

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Landslides and Geohazards III

ABSTRACT: One of the available approaches for improving the stability of earth slopes is slope benching. Slope benching is often applied in construction of slopes associated with highway and railways projects as it decreases the overall slope steepness and consequently increases the mass stability leading to a higher factor of safety against global instability. In this paper, a parametric study of the global stability of a number of selected benched earth slope configurations was carried out using Slope/W Program. The limit equilibrium analysis approach using the well-Stability charts for various benched slopes were developed based on the obtained results from this study. Charts were prepared for slopes as functions of bench-width ratio, bench count, steepness, soil parameters and pore water pressure ratio parameters. The obtained charts are considered practical and could reasonably be used as a tool in preliminary slope benching design.

RÉSUMÉ: Le terrassement en gradins est l'une des approches disponibles pour améliorer la stabilité des pentes en créant des talus chemins de fersol. Un tel aménagement augmente le facteur de sécurité contre l'instabilité globale. Dans cet article, une étude paramétrique de la stabilité globale de certaines configurations de talus préalablement sélectionnés a été réalisée à l'aide du le programme Slope/Wdifférents talus en gradins, des diagrammes de stabilité ont été développés à partir des résultats obtenus à partir de cette étude. Des abaques ont été préparés pour les talus en fonction du rapport entre la largeur des bancs, le nombre de talus, l'inclinaison, les paramètres du sol et ceux du rapport de la pression interstitielle. Les abaques obtenus sont considérés comme pratiques et pourraient raisonnablement être utilisés comme outil dans la conception préliminaire des talus.

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Cite this article:
Hossein Ghiassian; Pedram Saffari; Fathi M. O. Mohamed (2018) Parametric Study of Global Stability of Benched Earth Slopes in GEO2018. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2018Paper302,author = Hossein Ghiassian; Pedram Saffari; Fathi M. O. Mohamed ,title = Parametric Study of Global Stability of Benched Earth Slopes ,year = 2018}