The tunnels
By Richard High11 June 2008
Length: 9.7 km of twin track railway tunnel
Seven shafts for tunnel ventilation and emergency egress
Short mined adits to the bored tunnel
TBM: Mitsubishi Earth Pressure Balance
Diameter: 9.59 m
Length of first drive: Union Square Station to Burjuman Station, 1456 m, including passing under the Creek, with about 10 to 13 m cover to Creek bed and 22 m below Creek sea level
Lining: pre-cast bolted segmental lining, 400 mm thick, with ring taper
Geology: marine sand, overlying cemented sand and Sandstones
Water table: typically 3 to 4 m below ground level
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