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Aspects of the Design and Construction of the Chong Ming Tunnel Shanghai

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Author F Ng, R Frew and E Wong and G Ferguson
ID P200803035

Description

The Chang Jiang Tunnel and Bridge Project, when completed, will provide a
fixed link between Shanghai's rapidly developing Pudong District and Chong Ming
Island, situated in the Yangtze River delta. The link includes 7.5 km of bored
tunnel from the Pudong to the intermediate Changxing Island from where the link
comprises viaduct and a cable stayed bridge.


The bored section comprises twin 13.7 m internal diameter segmentally lined
three-lane highway tunnels. At its deepest point the tunnel will be 55 m below
the river. Cross passages will link the two bores for passenger evacuation.
Tunnel boring commenced in October 2006 and is scheduled for completion in
mid-2009.


The paper describes the key features of the design and construction of the
bored tunnel by two 14.53 m diameter slurry TBMs and eight cross passages using
ground freezing techniques in alluvial sediments.


A decision to include light rail below the road deck was taken after the
completion of the detailed design. This posed a number of design challenges
including passenger evacuation to the road deck, and the redesign of the low
point sumps. The various options considered are discussed together with those
adopted for construction.