INTERNATIONAL SOCIETY FOR SOIL MECHANICS AND GEOTECHNICAL ENGINEERING This paper was downloaded from the Online Library of the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE). The library is available here: https://www.issmge.org/publications/online-library This is an open-access database that archives thousands of papers published under the Auspices of the ISSMGE and maintained by the Innovation and Development Committee of ISSMGE. The paper was published in the proceedings of the 11th Australia New Zealand Conference on Geomechanics and was edited by Prof. Guillermo Narsilio, Prof. Arul Arulrajah and Prof. Jayantha Kodikara. The conference was held in Melbourne, Australia, 15-18 July 2012. Victoria Park Tunnel – Drawdown and Settlement in the Auckland Central Business District S. J. France1, G. Newby2 and A. L. Williams3 1Beca Infrastructure Ltd, P.O. Box 6345, Auckland 1141, New Zealand; PH (64) 300-9000; FAX (64) 300-9300; email:
[email protected]. 2Beca Infrastructure Ltd, P.O. Box 6345, Auckland 1141, New Zealand; PH (64) 300-9172; FAX (64) 300-9300; email:
[email protected]. 3Beca Infrastructure Ltd, P.O. Box 6345, Auckland 1141, New Zealand; PH (64) 300-9140; FAX (64) 300-9300; email:
[email protected]. ABSTRACT Construction of the Victoria Park Tunnel (VPT) project required the excavation of a 450 m long, 3 lane road tunnel through Auckland’s CBD in close proximity to the Waitemata Harbour. The tunnel, constructed using cut and cover techniques, had a maximum excavation depth of 11 m bgl (some 9 m below the groundwater table) through contaminated fill, compressible alluvium and sedimentary rock.