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Am Limit – Lockergesteinsvortriebe unter der Stadtautobahn von Toronto
Author(s) -
Urschitz Gerhard J.
Publication year - 2019
Publication title -
geomechanics and tunnelling
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.317
H-Index - 18
eISSN - 1865-7389
pISSN - 1865-7362
DOI - 10.1002/geot.201900026
Subject(s) - excavation , christian ministry , procurement , civil engineering , transport engineering , engineering , geotechnical engineering , business , law , marketing , political science
During the Design‐Build‐Finance procurement of the “RER Highway 401 Rail Tunnel” , the option with two single SEM tunnels was selected as preferred alternative. The challenges of this project lie not only in the conditions and requirements by the Ministry of Transportation of Ontario, the owner of the highway above and the existing tunnel beside the new tunnels, but also in construction beneath one of the busiest highways in North America. Pre‐support measures for tunnel excavation, which cannot involve any type of grouting directly beneath the roadway surface, were evaluated based on their risk exposure, resulting in the selection of a pipe jacked umbrella above the tunnel crowns. A sophisticated monitoring programme is implemented with online access at any time to allow for immediate response and implementation of pre‐determined mitigation measures as required.