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Perth City Rail Tunnel Project – Overview, Geotechnical Conditions and Building Protection

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Author E Hudson-Smith and M Grinceri
ID P200803005

Description

The New MetroRail City Project was completed in 2007 in
Perth, Western Australia. The project included construction of two underground
stations, twin bored rail tunnels of 1.4 km combined length and cut-and- cover
tunnels and dive structures of about 1 km total length. It is the first major
underground construction project within the Perth central business district
(CBD). This paper provides an introduction to the project and describes the
geology and hydrogeology of the area. Ground conditions varied significantly
along the alignment from soft estuarine muds in an area of reclamation to very
dense cemented sands and very stiff to hard clays. Deep foundations for the
project extend down into the bedrock below the CBD, a Tertiary
siltstone/sandstone. Key geotechnical hazards encountered during the project are
discussed. The building protection methodology on the project is described,
including damage assessment, condition surveys, monitoring and protection of key
structures.