Tunnelling at Forrestfield, the site that hosts the infrastructure vital to tunnel boring machine (TBM) operations, began in August (TBM Grace) and October (TBM Sandy) 2017. The site is operating 24 hours a day to support tunnelling activities, including processing excavated soil and treating water for re-use in the tunnelling process.
In a bid to unite the divided construction site at Forrestfield (dive structure, stowage area construction and station works to the west – TBM operations to the east), a section of Dundas Road has been realigned and is now open. The road changes allow backfilling of the station retaining wall to continue. View a map of the changes to Dundas Road.
The 300m long retaining wall for Forrestfield Station is almost completed, with 89 of the 93 panels in place. The remaining four panels will be installed once the multi-service vehicles no longer require access to the tunnels. More than 100 counterforts are being used to keep the 8.2m high wall securely in place. The counterforts support the 18 tonne wall panels, as well as the backfilling which is required to raise the ground level at the station by up to 6m.
Forrestfield Station is starting to take shape with the construction of the station’s platform foundations now in progress. The island platform will be 150m long, 11.5m wide and will help move an estimated 9800 passengers to and from the new station daily. At the station concourse level installation of hydraulic services is nearing completion and installation of power and communication services has commenced.
The stowage area, at the southern end of the site, is also coming along nicely with the stowage building concrete slab scheduled to be poured before the end of the year to enable brickworks for the building to start.
A recent sinkhole at the project's first tunnel-to-tunnel cross passage is requiring ongoing assessment and repair. Jet grout was injected into the ground late last year in preparation for the cross passage to be constructed. In this instance, a leak occurred during construction allowing groundwater and fines to flow into the cross passage and one of the tunnels. As a result, a sinkhole formed at the surface above the cross passage, about 200m north of the Forrestfield Station site where the tunnels follow the alignment of Dundas Road. The leak has been stopped and efforts have shifted to repairing damage caused by the leak, including the reinstatement of Dundas Road.
Until further notice traffic is diverted from Dundas Road to Sorensen Road, Newburn Road, Butcher Road, Maida Vale Road, then back to Dundas Road. View a map of the traffic changes.
We apologise for the inconvenience and ask motorists to continue to be mindful of changes in the volume of traffic and types of vehicles (i.e. heavy vehicles) using local roads.
Access remains open to local businesses.
Updates, including a detailed timeline of works, will be published as they become available.