The new 11 storey Ei8ht Apartment building on South Esplanade on the Glenelg Foreshore created a unique engineering problem for the project team.
The building, which includes a two-level basement car park, had to be constructed on extremely soft ground comprising loose dune sand of assumed CBR 2%. To be able to undertake piling for the project, a working platform suitable for the maximum proposed piling loads of 340kPa was required. By utilising Tensar SS geogrids the platform depth could be reduced without compromising on performance and strength.
The final design included a 400 mm deep pavement over Tensar SS40 geogrid on top of existing dune sand. The Tensar SS40 layer provides stabilisation of the platform that would otherwise have only been achieved with a deeper pavement, providing the project team with significant cost savings.