Meriton Apartments, Dee Why
How do you build a hole the size of 14 Olympic size swimming pools on Sydney’s northern beaches? With the support of geotechnical solutions by Keller.
Working closely with our customer, Meriton, Keller Ground Engineering have collaborated with sister company Keller Foundations combining our specialist products with our piling capability to provide a low permeability wall over 30m deep, retaining up to 11m of soil and over 500m in length. Mother nature provides the principal challenge with a paleochannel filled with interbedded layers of very soft clays, loose sands and peats. Choosing the right retention system required deep knowledge of construction methods and experience of the soil conditions.
Keller are constructing a CFA contiguous piled wall to depth of 6m below bulk excavation with jet grout infills, then jet grout lameas to rock in places over 30m deep on the site.
Vertical loads applied to the top of the walls have to be taken to the Sandstone bedrock, meaning that some of the piles in the wall are 36m deep. CFA piles to these depths and more are a Keller Foundations speciality.
The soft soil conditions are known to present challenging conditions for ground anchors installation however using the KGE expertise in complex anchoring techniques we confidently designed the system with efficient anchor loads to optimise the pile design.
Our final design challenge was provided by the location of a neighbouring basement meaning that it was impossible to install ground anchors. A combination of ground improvement and large diameter CFA piles have been designed to provide a cantilever piled wall with the added benefit of a faster build program for our client in this area.
All in all one of the most challenging sites that we have been involved in but at Keller it’s a challenge we accept. We look forward to talking with you about your next geotechnical challenge.