Dragados - SNC Lavalin - Ellis Don
Tender design, preliminary and full detailed design including execution drawings for three mined station caverns, adits and shafts. Additionally, construction support services on site were provided.
The confederation Line in Ottawa encompasses 15 stations and stops; its centre piece is a 2.5km long tunnel with three underground stations underneath downtown Ottawa. The mined construction method for the stations was chosen in order to minimize the impacts to the surface. The underground stations are located directly adjacent to existing, sensitive and sometimes historic buildings requiring detailed studies of risks during construction and risk mitigation measures.
The geology varies from strong limestone to competent and fractured shale. A soft ground section includes highly disturbed glacial sand/silt/clay deposits with a high water table.