Owner
Metrolinx and Infrastructure Ontario
Client
CTSC: SNC-Lavalin, Dragados, Aecon, EllisDon JV
Cost
$8.25 billion CAD
Timeframe
May 2015
— January 2021
Services performed
Detailed 24/7 supervision and engineering support for three SEM stations in soft ground; namely Laird, Avenue and Oakwood.
Description
The Crosstown is a light rail transit line, which is part of the regional transportation plan for the Greater Toronto and Hamilton Area. The project will provide a 19km corridor across Eglinton Avenue, connecting ten stops and 15 underground stations with a 10km twin-bored tunnel. Dr. G. Sauer & Partners provided detailed design for Oakwood, Avenue, and Laird stations. A combination of Cut-and-Cover construction for the shafts and mined techniques (SEM) for the tunnels was utilised. The 24/7 supervision services provided engineering support and detailed inspection and documentation of experts for each of the three stations.
Geology
Glacial depositional systems created a complex distribution of heavily overconsolidated till layers, separated by interstadial stratified deposits of glaciolacustrine clay, silt, and sand.
Location
Toronto, Canada
Highlights
- Difficult geological and hydrological ground conditions using pipe arch as pre-support
- Shallow tunnelling underneath roads and buildings
- Large tunnel geometry in soft ground utilising double side-wall drift
Route map (www.thecrosstown.ca)
Laird Station Excavation