Edmonton LRT, a tunnelling laboratory for North America

CASE STUDY 1992: Construction of Edmonton’s light rail transit system saw the first application of NATM in soft ground and the first use of bentonite slurry TBM excavation in North America. The organisation and management of the project, as well as the contractual arrangements for the execution of TBM and SEM observational excavation methods, marked the Edmonton experience as a test case from which other urban metro authorities learned a great deal.