Legacy Way Tunnel

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GHD was engaged by the Transcity Joint Venture to provide all geotechnical and geological requirements for design and construction support for the Legacy Way Tunnel in Brisbane, Queensland.

The project consists of two 4.2 km Tunnel Boring Machine (TBM) tunnels with 46 connecting passages that extend between two cut and cover tunnel portals. In addition a 550 m long purpose built conveyor tunnel was constructed by conventional tunnelling methods to transport the TBM spoil to a working quarry.

Our team undertook the geological analysis, geotechnical design, construction supervision and support including geological mapping of excavations, TBM face inspections and allocation of temporary underground rock support over a four-year period.

Engineering geology activities underground during construction included geological mapping of the TBM face, the tunnel walls/face during drill and blast or conventional excavation of cross passages, substation and low point sump. GHD was responsible for assigning rock support of all drill and blast and conventional excavation works, using NATM, Q and RMR evaluation with analysis of ground conditions with respect to design requirements and supervising installation.

Geological assessment and forward geology projection advice was provided to the tunnel superintendent for TBM and Cross Passage excavation based upon the geological model, which was updated throughout excavations as tunnelling progressed.



GHD's Geology team applies geological principles to the civil engineering, and mining and resources development industries. We work with our clients to deliver tailored solutions that optimise the negotiation of prevailing geological conditions, with the aim of minimising project cost and risk.

Our geological services are fully integrated with the diverse skills base across the GHD network. As an international professional services provider, we deliver the following geology services:

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Drawing on our depth of international and Australian experience, GHD is well positioned to provide routine design as well as expert services for all phases of tunnel and underground space projects.

Our people have worked on some of the most iconic tunnel projects in Australia and around the world. We continue to push technical boundaries and have achieved key milestones and optimum outcomes in soft soil to hard rock environments. Our experience has grown through the delivery of award winning technical solutions to both contractors and client organisations in Australia and internationally.

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