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Presentation
Soft soil foundation improved by vacuum and surcharge preloading at Ballina bypass, Australia
Faculty of Engineering - Papers (Archive)
  • Buddhima Indraratna, University of Wollongong
  • Cholachat Rujikiatkamjorn, University of Wollongong
  • Richard Kelly, Coffey Geotechnics, Sydney, Australia
  • Henk Buys, Road and Traffic Authority, NSW, Australia
RIS ID
29988
Publication Date
1-1-2009
Publication Details

Indraratna, B, Rujikiatkamjorn, C, Kelly, R & Buys, H, Soft soil foundation improved by vacuum and surcharge preloading at Ballina bypass, Australia, In Leung, C, Chu, J & Shen, RF (eds), International Symposium on Ground Improvement Technologies and Case Histories, 2009, 95-105, Singapore: Research Publishing.

Abstract

The Pacific Highway is being upgraded to support the transportation demand between Sydney and Brisbane, Australia. To avoid the town of Ballina, the bypass route has to traverse on a floodplain consisting of very soft, highly compressible, saturated marine clays up to 40m deep. A vacuum assisted surcharge load scheme in conjunction with prefabricated vertical drains was selected to reduce the required time and consolidate the deeper subsoil layers. The design of the combined vacuum and surcharge fill system and the construction of the embankment is described. A comparison of the performance of the vacuum combined surcharge loading system with a standard surcharge fill highlights the benefits of vacuum consolidation. Field monitoring data is presented to demonstrate how the embankment performed during construction. Suitable design charts for vertical drains were developed considering both vertical and horizontal drainage. As a result, the conventional and often cumbersome trial and error methods to estimate the appropriate parameters could be avoided.

Disciplines
Citation Information
Buddhima Indraratna, Cholachat Rujikiatkamjorn, Richard Kelly and Henk Buys. "Soft soil foundation improved by vacuum and surcharge preloading at Ballina bypass, Australia" (2009) p. 95 - 105
Available at: http://works.bepress.com/crujikiatkamjorn/55/