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Highway 401 Crossing - Design

SEM tunnel design consisting of IFC drawings, specifications, 3D FE analysis and detailed design reports.
Estimated cost: Commencement:
November 01, 2017
Completion date:
January 01, 2019
97 Front Street West
Toronto, ON ON MJ5 1E6
Technical data:
Geology description:

Granular and cohesive embankment fill underlain by glacial till. Subsurface obstructions such as piles and boulders.

Geology types:
Bid cost: Final cost:
$117 million CAD
Service areas:
Construction methods:
Tunneling under:

The TTP are delivering a new two track rail tunnel of approximately 176m length crossing the Highway 401. The purpose of the tracks is to increase capacity along the Kitchener GO commuter rail corridor as well as to accommodate the new Union-Pearson (UO) Express service. The new rail tunnels are mined under the 401/409 Highway using the Sequential Excavation Method (SEM). Our role on this assignment was to provide tunnel design services addressing the challenging conditions (e.g., very low overburden, intercepting piles and maximum settlement allowance) as well as providing on site design representation.

3D Finite Element Model
Plan View