Sydney Gateway is a project designed to provide a high-capacity connection from Sydney Airport to the new WestConnex St Peters Interchange. This large-scale project includes many challenges, such as working with and satisfying various Regulatory Bodies, to the demanding and unfavourable geology.
From a geotechnical perspective, the main challenges related to the shallow ground water and geology. The underlying near-surface material was made up of granular fill or natural loose sand, which required creative solutions to deliver many of the temporary work requirements. One of these solutions included constructing temporary piling platforms and crane pads to accommodate large piling rig and mobile crane loads.
Working with the JHSW (John Holland / Seymour Whyte) JV team, CMW Geosciences carried out various geotechnical activities, including identifying and resolving technical challenges, preparing effective temporary work designs and supporting with construction phase services (CPS). CPS included carrying out numerous site inspections to verify design assumptions for both temporary and permanent works.
What we achieved
On the Sydney Gateway project, CMW Geosciences has carried out the following to date:
- Designed more than 60 individual temporary work packages
- Observed more than 30 proof rolls
- Observed more than 100 bored piles
- Undertaken more than 100 Dynamic Cone Penetrometer (DCP) tests