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Design and Construction of the City West Cable Tunnel, Sydney Australia


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Author J J Ashley


EnergyAustralia is a state-owned corporation in the
state of New South Wales, whose responsibility includes ownership and management
of an electricity distribution network. Expansion of the high voltage
distribution network in the Sydney central business district (CBD) includes the
requirement to run an additional five 132 kV feeders over 1.7 km from south of
the CBD to a new 132 kV substation in the northern section of the CBD. A driven
tunnel is currently being excavated in Sydney sandstone beneath Darling Harbour
to contain the new 132 kV feeders. Tunnel construction methods involve both
roadheader and tunnel boring machine (TBM) excavation. This paper describes the
design development of the cable tunnel, discusses the use of a geotechnical
baseline report as an integral part of the contract documentation and provides
an update of the current construction works.