Performance and Prediction of Vacuum Combined Surcharge Consolidation at Port of Brisbane



Publication Details

Indraratna, B., Rujikiatkamjorn, C., Ameratunga, J. Boyle, P. (2011). Performance and Prediction of Vacuum Combined Surcharge Consolidation at Port of Brisbane. Journal of Geotechnical and Geoenvironmental Engineering, 137 (11), 1009-1018. >


During the past decade, the application of vacuum preloading for stabilizing soft coastal clay and other low-lying estuarine soilshas become popular in Australia. The cost-effectiveness is a major factor in most projects in view of the significantly reduced time forachieving a relatively high degree of consolidation. Resulting from an increase in trade activities at the Port of Brisbane, new facilitieson Fisherman Islands at the mouth of the Brisbane River will be constructed on the new outer area (235 ha) adjacent to the existing portfacilities through land reclamation. A vacuum-assisted surcharge load and conventional surcharge scheme in conjunction with prefabricatedvertical drains was selected to reduce the required consolidation time through the deeper subsoil layers. The design of the combined vacuumand surcharge fill system and the construction of the embankment are described in this paper. A comparison of the performance of the vacuumcombined surcharge loading system with a standard surcharge fill highlights the clear benefits of vacuum consolidation. Field monitoring dataare presented to demonstrate how the embankment performed during construction. An analytical solution for radial consolidation consideringboth time-dependent surcharge loading and vacuum pressure is proposed to predict the settlements and associated excess pore pressures of thesoft Holocene clay deposits.>

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