The Eglinton Crosstown Light Rail Transit Project (approximate contract value of 5.4 BCAD$) in Toronto includes the construction of three SEM (Sequential Excavation Method) huge mined caverns, six cut and cover and four top-down stations to be built in a tight 6-year schedule.This paper describes the innovative solutions implemented during the design and construction stages to overcome significant schedule and technical challenges expected in any urban project.Temporary support details as shotcrete with no need of steel arches or girders, a combined lining design approach and optimized sequencing with innovative strategies to enable mining and final lining activities overlaps are some of the key aspects described.
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