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Ottawa Light Rail Transit - Design

Tender design, preliminary and full detailed design including execution drawings for the mined twin track running tunnel, three mined station caverns and access shafts.
Estimated cost: Commencement:
March 01, 2012
Completion date:
529 Albert St
Ottawa, ON K1R 7Z0
Technical data:
Geology description:

The geology varied between competent limestone and fractured shale. A soft ground section included highly variable glacial till deposits comprising sand, silt and clay layers and a groundwater table close to ground surface.

Geology types:
Bid cost: Final cost:
$2.1 billion CAD
Service areas:
Construction methods:
Tunneling under:
Tunnel length:

Ottawa's Confederation Line runs from Tunney's Pasture station in the west to Blair station in the east, is 12.5 km long and includes 15 stations. The central piece is a 2.5 km long tunnel, running under the central business district of the city and including three underground stations. The twin track running tunnel and the three underground stations were constructed using the mined construction method in order to minimise surface disruption. The underground stations are located directly adjacent to existing, sensitive and sometimes historic buildings and required detailed studies of risks and risk mitigation measures during design and construction.

Downtown station located between high-rise buildings
Downtown station construction sequencing
Cavern construction under way
Mined Caverns directly adjacent to existing basements
Special Excavation Sequences incorporating pre-tensioning
Large-Scale 3D Numerical Modelling incorporating the surroundings