en.Wedoany.com Reported - The Torrens to Darlington (T2D) Motorway Project in South Australia has reached a critical milestone, with the 300-tonne cutterhead for the first Tunnel Boring Machine (TBM) recently lifted and lowered into the 20-meter-deep launch shaft at Clovelly Park. As the largest infrastructure project in South Australia's history, with a total investment of A$15.4 billion, it aims to break through the north-south traffic bottleneck and is expected to be fully open to traffic by 2031.
To accommodate two TBMs operating in parallel, the project team has excavated 120,000 cubic meters of earth to construct a massive launch shaft measuring 120 meters long, 50 meters wide, and 20 meters deep. Currently, the first and second TBMs are being assembled simultaneously and will soon commence boring the 4.5-kilometer southern twin tunnels. All components for the third TBM, responsible for the 2.2-kilometer northern tunnel, have been delivered to the site. The three machines will enable simultaneous construction of the northern and southern tunnels.
These "underground giants" boast impressive specifications: each is approximately 100 meters long, 15 meters in diameter, weighs 3,500 tonnes, and is capable of advancing 8 to 10 meters per day once operational. South Australian Premier Peter Malinauskas stated, "The lifting of the cutterhead is a milestone for our state's infrastructure. The project will progress alongside South Road, which is used daily by residents. Upon completion, it will fully open the north-south corridor, allowing residents to bypass 21 sets of traffic lights and save several hours of commuting time each week."
According to the plan, tunnel boring is scheduled to commence in the second half of 2026. The project team is currently advancing equipment commissioning and supporting works to ensure the project timeline is met. Once completed, the T2D project will connect a 78-kilometer signal-free motorway from Gawler to Old Noarlunga, injecting strong momentum into the regional economy.
As a rare case in the Southern Hemisphere involving simultaneous construction of multiple tunnels, the T2D project validates the technical feasibility of large-scale TBM cluster operations. Its schedule management and efficiency model may serve as an important reference for future urban tunnel projects.
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