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Challenging Design of a Strutted Sheet Pile Shaft for the Highway 401 and 409 Rail Tunnels, Metrolinx Project

Prakash Nadesparan, Tyler Lahti, Mary Jane Ferraro

In the proceedings of: GeoVirtual 2020: 73rd Canadian Geotechnical Conference

ABSTRACT: A deep strutted sheet pile shaft (26m x 10m x 9.8m) was designed to facilitate the construction of support pipe canopy required for tunnel construction in the soft ground between the Highway 409 eastbound ramp and Highway 401 eastbound express lanes. The unbalanced loading on the shaft has been considered due to the grade difference between the Highway 409 ramp and Highway 401 eastbound lanes. The presence of the existing rail tunnel adjacent to the shaft excavation and existing skew of the rail tunnel relative to the Highway resulted in unique design challenges. This paper will provide a comprehensive overview of the challenges encountered during detailed design, analysis techniques adopted, and a summary of the settlement profile observed on the ground surface around the shaft.


RÉSUMÉ: Un puits de palplanche blindé (26 mx 10 mx 9,8 m) a été conçu pour faciliter la construction de toit-abris en tuyaux requis pour la construction de tunnels en sol meuble entre la bretelle en direction est de l'autoroute 409 et les voies express en direction est de l'autoroute 401. Les charges mal équilibrées sur le puits ont été prises en compte en raison de la différence de niveau entre la bretelle de l'autoroute 409 et les voies en direction est de l'autoroute 401. La présence du tunnel ferroviaire existant adjacent à l'excavation du puits et le biais existant du tunnel ferroviaire par rapport à l'autoroute ont entraîné des défis de conception uniques. Cet article fournira un aperçu complet des défis rencontrés lors de la conception détaillée, des techniques d'analyse adoptées et un résumé du profil de tassement observé à la surface du sol autour du puits.


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Please include this code when submitting a data update: GEO2020_253

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Cite this article:
Nadesparan, Prakash, Lahti, Tyler, Ferraro, Mary Jane (2020) Challenging Design of a Strutted Sheet Pile Shaft for the Highway 401 and 409 Rail Tunnels, Metrolinx Project in GEO2020. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Nadesparan_GEO2020_253, author = {Nadesparan, Prakash}, {Lahti, Tyler}, {Ferraro, Mary Jane},
title = Challenging Design of a Strutted Sheet Pile Shaft for the Highway 401 and 409 Rail Tunnels, Metrolinx Project ,
year = 2020
}