ABSTRACT
The Canada Line is a rapid transit system recently completed in Vancouver for the 2010 Winter Olympics. The bored tunnel section consists of 2.45 km of twin bored tunnels and 3 stations. The tunnels were driven with a 6 m diameter Earth Pressure Balance Tunnel Boring Machine (EPBM) and lined with 250 mm thick, 5.3 m diameter, 1.4m length precast concrete segments. Unforeseen difficulties occurred while boring the 750 m stretch through glacial and interglacial deposits of sand, silt, and clay with granitic boulders.
