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Tunnelling Competency brochure

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7 Aurecon Tunnelling Winner Gold Award 2011 ACENZ Innovate NZ Awards of Excellence Rosedale Wastewater Treatment Outfall New Zealand Client McConnell Dowell To protect and improve the quality of Auckland's beaches, a new tunnel and outfall was constructed which allows treated water to be discharged 2.7 km offshore, compared to the previous distance of 600 m. Aurecon delivered all of the detailed design for the tunnel, the marine outfall pipe and the 38 m deep cascade drop shaft, which was the first use of a cascade in New Zealand. The hydraulic design required an analysis of air entrainment, initial dilution, headloss and saltwater expulsion issues for the treated effluent discharge, and shear stress and flow characteristics. The transition riser was a critical asset and was designed to improve flushing and to facilitate maintenance operations using a 3D computational fluid dynamic model. South Island Line (East) Contract 901 Hong Kong Client Kier Laing O'Rourke Kaden Joint Venture Part of the 7km South Island Line (East) project on Hong Kong Island, Contract 901 involved complex tunnelling within an urban environment, further complicated by an interface with an existing operational railway. Aurecon provided geotechnical, civil and tunnel engineering for the South Island Line (East) where the new integrated Admiralty station will provide a convenient interchange between four rail lines. These works included design of temporary and permanent rock support for the 25 metre span station cavern, platform tunnels, overrun tunnels and adits. Aurecon also undertook the temporary support design for the Supplementary Emergency Entrance shaft, the design of the temporary acoustic building and the development of the Contractors Blasting Assessment Reports for the underground tunnels and station box. Carrapateena Exploration Declines Australia Client OZ Minerals OZ Minerals will construct mine declines to provide access to the Iron Oxide Copper- Gold deposit at Carapateena South Australia. Construction of the access declines will be driven by a Main Beam Rock Tunnel Boring Machine (TBM). The length of the declines is more than 5km and up to 1.7km below surface level. OZ Minerals engaged Aurecon to provide consultancy services for concept and detailed design of the exploration declines. Aurecon delivered site lay-out plans, box cut designs, geological models of the declines, geotechnical assessment and rock mass characterisation for tunnel support, along with preparation of a Geotechnical Baseline Report and assistance to OZ Minerals in development of the project contract documents.

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