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Case Study-Railway Embankment Widening for CN Rail & GO Transit

Glenn Caverson, Doug Lowry

In the proceedings of: GEO2010 Calgary: 63rd Canadian Geotechnical Conference & 6th Canadian Permafrost Conference

Session: M1-A

ABSTRACT: GO Transit, The Greater Toronto Area's commuter rail/bus system is currently undergoing a dramatic expansion in service. A part of this expansion is an improvement in the limited rail service between Hamilton and Toronto, Ontario, some 65 km to the east. In some cases, in order to meet the increased commuter volume demands, it is necessary to add additional tracks to accommodate the existing and future rail traffic. This is certainly the case on the Lakeshore West Line where a third track was only the way to meet demand. In the Lorne Park area of Mississauga, existing conditions did not provide sufficient room for a number of rail embankments to be widened without the use of an earth retention system. Numerous retaining wall and over-steepened slope options were considered for the seven distinct locations. The ultimate solution was a prototype Mechanically Stabilized Earth (MSE) retaining wall that combined a steel fascia with geosynthetic reinforcement. This case study will examine the various aspects of this project from the initial stages of design, through the various solution options, to the development of the final solution. With a restricted time schedule and construction constraints, the paper will also detail how those major obstacles were successfully overcome in the completion of this project.

RÉSUMÉ: Le réseau GO, système de trains/autobus de banlieue de la région du Grand Toronto, connaît actuellement une formidable augmentation de service. Cette augmentation consiste notamment à améliorer le service ferroviaire limité entre Hamilton, en Ontario, et Toronto, à quelque 65 km à l'est. Dans certains cas, pour répondre à la demande accrue du nombre de banlieusards, il est nécessaire d'ajouter des voies pour faire face au trafic ferroviaire actuel et futur. C'est sûrement le cas du corridor Lakeshore Ouest où une troisième voie était le seul moyen de répondre à la demande. Dans la zone de Lorne Park, à Mississauga, les conditions existantes ne laissaient pas assez d'espace pour permettre d'élargir divers talus ferroviaires et de recevoir une troisième voie sans recourir à un système de rétention de sol. On a examiné diverses solutions de murs de retenue et de pentes très inclinées pour les sept endroits distincts. La solution finale a été un prototype de mur de retenue en terre stabilisée mécaniquement, qui combine une bordure en acier et un renforcement géosynthétique.

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Cite this article:
Glenn Caverson; Doug Lowry (2010) Case Study-Railway Embankment Widening for CN Rail & GO Transit in GEO2010. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO2010_006, author = Glenn Caverson; Doug Lowry,
title = Case Study-Railway Embankment Widening for CN Rail & GO Transit,
year = 2010
}