Excavations In The Brisbane CBD

Significant geological non-conformities (i.e. shear zones or contact zones) exist within the geological formations that underlie the Brisbane CBD. Where deep excavation is proposed geotechnical modelling of these excavations must be undertaken to fully understand the possible slope failure mechanisms and to design appropriate positive support requirements. Site specific geotechnical models must be verified by inspection and monitoring of the respective excavations.

This paper highlights the geological and geotechnical engineering aspects of some recently completed deep excavations in the Brisbane CBD.

The projects discussed include the Brisbane Casino Carpark, which comprised a 22m deep by 80m square excavation where full-time slope stability assessment and inclinometer monitoring were undertaken. The excavation was adjacent to heritage-listed buildings and the project won an ACEA ‘Award of Excellence’ for Douglas Partners Pty Ltd.