Settlement analysis of eastern reclamation area: Port of Townsville

Jaditager, M., Lovisa, J., and Sivakugan, N. (2015) Settlement analysis of eastern reclamation area: Port of Townsville. In: Proceedings of the 12th Australia New Zealand Conference on Geomechanics, pp. 1131-1135. From: ANZ 2015: 12th Australia New Zealand Conference on Geomechanics, 22 - 25 February 2015, Wellington, New Zealand.

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Abstract

The Port of Townsville's successive maintenance and capital dredging campaigns for the last two decades have resulted in the deposition of over two million cubic metres of soft dredged material into the port's eastern reclamation area. The dredged mud slurry is hydraulically placed into containment ponds and left to settle and self-weight consolidate, thereby forming 50 hectares of reclaimed land. In addition to challenges of low bearing capacity and high compressibility, land reclaimed with compressible dredged material would take decades to complete the consolidation process by natural means. Ground improvement techniques are usually applied to enhance strength and compressibility characteristics, to expedite the lengthy consolidation duration, and allow early land utilization. To ascertain geotechnical properties of the dredged fill material and subsurface soil of its eastern reclamation area, the Port of Townsville in collaboration with its geotechnical consultants, has conducted a series of field investigations and laboratory testing. Using soil parameters obtained from geotechnical investigations, the Port of Townsville has carried out ground settlement analysis on its eastern reclamation area under a range of applied loadings to evaluate the anticipated ground settlement. The estimated settlement values were utilized to refine the established consolidation lead times guidelines, ground improvement methods selection, and to appreciate likely performance of the treated ground. This paper discusses the Port of Townsville’s eastern reclamation area site description, geology, geotechnical investigations, site categorization, assumptions made to allow a rational ground settlement analysis, settlement assessment method used, obtained results and observations.

Item ID: 40903
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: compressibility, consolidation, dredged material, land reclamation, sedimentation, settlement
Date Deposited: 05 Apr 2016 02:02
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090501 Civil Geotechnical Engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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