A case study of roadway embankment design near a retaining wall in Montreal

Laifa Cao, Scott Peaker

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: Transportation Geotechnics II - Roads A

ABSTRACT: This paper presents a case study of roadway embankment design near an existing cantilever retaining wall in Montreal, Canada. A 6 m high roadway embankment supported using mechanically stabilized earth (MSE) was proposed to replace the existing roadway viaduct. A relieving platform consisting of expanded polystyrene geofoam was proposed to replace the existing soils in the area between the proposed MSE wall and existing retaining wall to relieve the construction impact of the embankment and temporary roadway to the existing retaining wall. A soil-structure interaction analysis using a finite element program confirms that the construction impact on the existing retaining wall can be successfully mitigated by means of the relieving platform. The global stability of the existing retaining wall prior to and after the construction was analyzed to confirm that the construction will not reduce the global stability of the existing retaining wall.

RÉSUMÉ: Cet article présente une étude de cas de conception de remblai routier près d™un mur de soutènement existant en porte-à-faux à Montréal, Canada. Un remblai routier de 6 m de haut retenu par un mur de terre stabilisée mécaniquement (TSM) a été proposé pour remplacer le viaduc existant. Une couche de remblai léger est proposée pour remplacer les sols existants dans la zone située entre le mur TSM proposé et le mur de soutènement existant, pour réduire l™impact de la construction de la voie temporaire ainsi que la mise en place du remblai sur le mur de soutènement existant. Une analyse d™interaction sol-structure à l™aide d™un programme d™éléments finis bidimensionnel confirme que l™impact de la construction du talus et de la voie temporaire sur le mur de soutènement existant peut être atténué avec l™utilisation de la couche de remblai léger. Cette analyse confirme que la construction n™affectera pas la stabilité globale du mur de soutènement existant.

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Cite this article:
Laifa Cao; Scott Peaker (2017) A case study of roadway embankment design near a retaining wall in Montreal in GEO2017. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2017Paper168,author = Laifa Cao; Scott Peaker,title = A case study of roadway embankment design near a retaining wall in Montreal,year = 2017}