Melbourne Main Sewer

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The $220 million MMSR Project will replace the existing Melbourne Main Sewer between the north bank of the Yarra River and the Hobsons Bay Main Sewer in Port Melbourne. This new infrastructure will consist of 2,088 m of driven, segmentally lined sewer tunnel. The new sewer, known as the Melbourne Main Reliever (MMR), will provide increased hydraulic capacity for anticipated future population growth of the city of Melbourne and the Docklands precinct.

GHD has developed innovative solutions to the challenges that arise from tunnelling in the difficult geology of the Yarra Delta.  The tunnel horizon consists of Sandy Clays, Silts and Sands with small regions of Basalts and Gravels, and several aquifer units.

The optimised pipeline alignment required a crossing of the Yarra River.  GHD developed an innovative solution to this challenge in order to minimise disruption to the river.  The GRP pipeline will be grouted within a steel pipe that will be situated in the silts of the river.  The pipeline will be support by concrete headstocks which each sit on two driven steel piles founded in the Werribee Foundation layer up to 28 meters below the river level.

Tunnelling

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GHD’s technical tunnelling solutions are characterised by innovation and a focus on our clients’ needs.

GHD’s skilled tunnel engineers are equipped to provide input during all stages of a tunnelling project from planning and design through to project management. Our experience has been enhanced through the delivery of award winning technical solutions to both contractors and client organisations throughout Australia and internationally.

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