American Society of Civil Engineers


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


by Buddhima Indraratna, Ph.D., (corresponding author), F.ASCE, (Professor, Civil Engineering, Faculty of Engineering, Univ. of Wollongong, Wollongong City, New South Wales 2522, Australia. E-mail: indra@uow.edu.au), Cholachat Rujikiatkamjorn, Ph.D., (Senior Lecturer, Civil Engineering Div., Faculty of Engineering, Univ. of Wollongong, Wollongong City, New South Wales 2522, Australia.), Jay Ameratunga, Ph.D., (Senior Principal, Coffey Geotechnics, 47 Doggett St., Newstead, Queensland 4006, Australia.), and Peter Boyle, (Manager, Reclamation and Land Development, Port of Brisbane Corp., Port of Brisbane, Queensland 4178, Australia.)

Journal of Geotechnical and Geoenvironmental Engineering, Vol. 137, No. 11, November 2011, pp. 1009-1018, (doi:  http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0000519)

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


ASCE Subject Headings:
Soil consolidation
Soil stabilization
Preloading
Soft soils
Drainage
Vacuum
Australia
Harbors

Author Keywords:
Consolidation
Soil improvement
Vertical drains
Vacuum