Under the mountain – City Rail Link, tunnel portal temporary retaining structure design and construction challenges
S.A.B. Farquhar & Y.F. ThorpTonkin & Taylor Ltd, New Zealand ABSTRACTThe City Rail Link (CRL) is the largest transport infrastructure project ever to be undertaken in New Zealand. It comprises a 3.45 km twin-tunnel underground rail link up to 42 m below the city centre….