A Case Study of Embankment Retaining Wall in Ontario

Laifa Cao

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: FOUNDATION DESIGN - I Retaining Walls & Spread Footings

ABSTRACT: This paper presents a case study of an embankment retaining wall. The retaining wall was designed to be up to 6m in height comprising six layers of rock-filled gabion baskets with base width of up to 4m founded on a very stiff to hard silty clay to clayey silt till. Three years after wall construction, vertical settlement of up to 138mm and lateral movement of up to 413mm were recorded at the face of the retaining wall. The significant lateral movement induced cracking in the road pavement structure. The wall stability and bearing capacity were reviewed. It was found that the wall was underdesigned for overturning, sliding and global stabilities; and soil bearing capacity was overestimated. The settlement was found mainly due to the consolidation and overstressing of the founding soils, whereas wall rotation and sliding as well as compaction and expansion of the stone baskets contributed to the significant lateral movement. Improvements for such retaining wall design are recommended.

RÉSUMÉ: Cet article présente une étude atteindre 6 m de hauteur formée de six couches de gabions remplis de roches avec largeur de base jusqu'à 4 m, fondée usqu'à. Trois ans après la construction du mur, règlement vertical jusqu'à 138 mm et un mouvement latéral de 413mm ont été enregistrés à la face du mur de soutènement. Le mouvement latéral significatif induite par fissuration dans la structure de chaussée routière. La stabilité du mur et portance ont été examinées. Il a été constaté que le mur a été underdesigned pour des stabilités renversement, coulissantes et mondiales; et sol capacité portante a été surestimé. La colonie est trouvé principalement en raison de la consolidation et sursollicitation de soutènement sont recommandées.

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