Managing subsurface risk for Toronto-York Spadina Subway extension project

D.L. Walters, A. Mian, S. Palmer, J. Westland, H. Bidhendi

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Transportation Geotechnics

ABSTRACT: The project management team studied design and construction strategy to manage subsurface risks on the Toronto-York Spadina Subway Extension (TYSSE) project. The adopted strategy is similar to the Subsurface Risk Management Strategy implemented for the Sheppard Subway Project in the 1990s. Measures include a firisk sharingfl approach to construction contracts, a commitment to comprehensive pre-construction site investigation, appointment of a Principal Geo-Engineering Consultant, preparation of Geotechnical Baseline Reports and the appointment of a Disputes Resolution Board for each major civil works contract. The level of site investigation effort for the major tunnelling and stations contracts is related to construction risks, such as change orders, to assess the optimum level of investigative effort.

RÉSUMÉ: L'équipe de gestion de projet a étudié une stratégie de conception et de construction pour gérer les risques souterrains dans le cadre du projet de métro « Toronto-York Spadina Subway Extension » (TYSSE). La stratégie adoptée est similaire à la stratégie de gestion de risques souterrains mise en œuvre dans le cadre du projet « Sheppard Subway Project » dans les années 1990. Les mesures comprennent une approche de répartition du risque envers les contrats de construction, un engagement à des études de site exhaustives avant le début de la construction, la nomination d™un consultant principal en géo-ingénierie, la préparation de rapports géotechniques de référence et la nomination d'un « Disputes Resolution Board » pour chaque contrat majeur de travaux de génie civil. Le degré d'effort à investir dans les études de site pour les contrats majeurs de creusement de tunnels et de stations est lié aux risques de construction, tels que les ordres de modification, afin d'évaluer le degré d™étude optimal.

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Cite this article:
D.L. Walters; A. Mian; S. Palmer; J. Westland; H. Bidhendi (2011) Managing subsurface risk for Toronto-York Spadina Subway extension project in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper903,author = D.L. Walters; A. Mian; S. Palmer; J. Westland; H. Bidhendi ,title = Managing subsurface risk for Toronto-York Spadina Subway extension project,year = 2011}