The Eglinton Crosstown Light Rail Transit (ECLRT) Project involved the construction of 11 km of 6.3m excavated diameter twin tunnels beneath Eglinton Avenue in Toronto, in advance of shored excavations for future cut-and-cover station construction. Over 37,000 cubic meters of dense glacial and interglacial soils were improved by the jet grouting methods to depths of up to 43 meters below ground surface (mbgs). Jet grouting was performed at station headwalls and tunnel cross-passages to manage groundwater and improve soil stability. The paper discusses the implementation of the jet grouting work in a congested urban environment, the quality control methodology and the effectiveness of the jet grout blocks during tunneling.
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