The WestConnex infrastructure project is one of the largest urban transport initiatives in Australia, designed to significantly improve connectivity between western and south-western Sydney and key economic hubs, including the CBD, Kingsford Smith Airport, and Port Botany. The project spans a total of 33 kilometres, comprising approximately 14 km of above-ground roads and 19 km of tunnels within the M4 and M5 corridors.
A critical component of this development is Stage 1B – the M4 East Extension, which involves the construction of underground tunnels from Homebush to Haberfield via Concord. This stage not only extends the M4 Motorway but also includes provisions for a future connection to the M4-M5 Link, further enhancing Sydney’s transport network.
The projects main objectives are to improve travel times, reduce congestion across Sydney roads, connect major commercial + freight precincts, deliver safer and more reliable roads for all users.
Witt played a pivotal role in the tunnelling works between Homebush and Haberfield via Concord, part of the broader infrastructure supporting future M4-M5 connectivity. This stage involved complex underground construction and the extensive use of both temporary and permanent geotechnical and structural systems. Throughout Stage 1B, Witt provided comprehensive geotechnical and structural engineering services, including both design and inspection, with a particular focus on temporary works, safety systems, and construction methodologies to ensure safe and efficient project delivery.
Our expertise contributed to the safe and efficient execution of complex tunnelling and structural works during Stage 1B. Focus on robust geotechnical design, structural safety, and detailed inspection ensured the project met engineering standards and progressed within critical timelines.
Witt Consulting provided comprehensive Geotechnical Design & Inspection Services, focusing on a range of critical infrastructure elements. This included the design and assessment of temporary retaining structures, slope stability evaluations, and the implementation of soil nail and reinforced soil walls. Additional expertise was applied to the construction of mass concrete walls and mechanically stabilised earth (MSE) walls, ensuring stability, safety, and performance across various site conditions.
Structural Design & Safety Engineering – This included the design and inspection of formwork and falsework systems, fall protection barriers and anchors, as well as elevated work platforms and walkways to ensure worker safety. Our engineers also provided crane and piling platform designs, developed temporary support systems, and conducted detailed reviews of lifting lugs and lifting plans to maintain compliance and minimise risk throughout construction operations.
Specialised Engineering Analysis – Design and analysis of under boring works with a comprehensive review and verification of lifting plans
