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Preview: Geomechanics and Tunneling 4/2021

The design of three mined stations in Toronto as part of the Eglinton Crosstown Light Rail Project involved several intersections of large tunnels situated in the heterogenous, water-bearing glacial till deposits. The most challenging openings, 220 m2 each, were formed in the two sides of the Cross-Cut tunnels to allow the excavation of the 18 m wide Platform Caverns. A key objective for the design was the optimization of the tunnel shapes and the advanced simulation of the fiber reinforced shotcrete properties, to allow these openings in the initial tunnel linings to be achieved without conventional bar reinforcement or thickenings, thus simplifying and accelerating the construction, whilst reducing health and safety risks.