GHD Geotechnics

Brisbane, Australia

GHD Geotechnics

Brisbane, Australia
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Leventhal A.,GHD Geotechnics | Hull T.,GHD Geotechnics | Steindler A.,GHD Geotechnics | Matheson J.,John Matheson and Associates | And 4 more authors.
International Journal of Geotechnical Engineering | Year: 2014

Longwall mining within the Bulli Seam has been conducted beneath the Main Southern Railway (Sydney-Melbourne). The railway track subsided 0.6 m during Longwall LW25, and the same again during LW26 (though at a different location). While limited mining has been permitted previously under Main Railway Lines, for the first time longwall mining (LW25) has been conducted beneath a Main Line without constraint to the rail traffic and without constraint upon the mining. This paper presents the response of a 4.6 m diameter inverted horseshoe-shaped brick arch culvert, supporting the line, during the undermining by LW25 and subsequently by the retreat of LW26. © 2014 W. S. Maney & Son Ltd.

Hu D.,GHD Geotechnics | Lo S.R.,University of New South Wales | Khalili N.,University of New South Wales | Kacavenda S.,GHD Geotechnics | Patel C.,GHD Geotechnics
Unsaturated Soils: Theoretical and Numerical Advances in Unsaturated Soil Mechanics - Proceedings of the 4th Asia Pacific Conference on Unsaturated Soils | Year: 2010

A successful study has been performed on measuring the volume change of an unsaturated soil specimen in cyclic triaxial shearing test. Aspecially designed radial calliper and an associated set of experimental methodology was developed to enable the monitoring of volume changes in cyclic triaxial tests on unsaturated soils. Special calibration tests were performed in order to verify of the volume change measurement A number of preliminary cyclic test results under different initial matric suction and net confining pressure were presented to illustrate its significance. © 2010 Taylor & Francis Group, London.

Surjadinata J.Q.,GHD Geotechnics | Hull T.S.,GHD Geotechnics | Carter J.P.,University of Newcastle
Geotechnical Aspects of Underground Construction in Soft Ground - Proceedings of the 7th International Symposium on Geotechnical Aspects of Underground Construction in Soft Ground | Year: 2012

In most tunnelling projects in urban areas, a preliminary assessment is often required of the impact of a tunnel excavation on foundations adjacent to the tunnel. Despite the significant recent advances in computer hardware and commercial software, a full 3-D analysis is still relatively costly, especially if it is to be employed as a preliminary assessment tool to ascertain the impact of tunnel excavation on existing foundations. This paper provides a convenient and cost-effective design tool, in the form of design charts, that will allow an economical preliminary assessment of the 3-D effects of tunnelling on a single pile. The method adopted to develop these design charts will be briefly described and their use in practice will be illustrated by application of the design charts to several published case histories. © 2012 Taylor & Francis Group.

Evans R.,GHD Geotechnics | Tran V.H.,GHD Geotechnics
Australian Geomechanics Journal | Year: 2013

The Port of Brisbane Motorway Upgrade project involves the construction of 6 km of new and duplicated motorway, delivered under a competitive double Early Contractor Involvement (dECI) model. The majority of the project is underlain by saturated soft soils up to 30 m deep, which presented various geotechnical challenges for performance of the road and interaction with fixed structures. A "tread lightly" observational risk based approach was adopted for the design and construction of embankments and ground improvement works. Initial settlement predictions were carried out using the Illicon procedure. Extensive instrumentation was installed, monitored and interpreted to provide improved post-construction settlement estimates.

Kotze G.,GHD Geotechnics
Australian Geomechanics Journal | Year: 2011

Shortland Esplanade at South Newcastle Beach traverses a stunning scenic location, at the base of an imposing coastal cliff line and defined by a sea wall that adjoins the Pacific Ocean. The cliff line and the sea wall comprise constraints that dictate the geometry, operation and management requirements of the esplanade alignment. The subject section of Shortland Esplanade has had a history of rockfall activity from the overlying coastal cliffs, one such episode of which prompted Newcastle City Council to close the esplanade to protect the public from ongoing rockfall hazards. GHD Geotechnics were subsequently engaged to provide the following services: • Identification of rockfall risk mitigation options • Quantification of rockfall risk (QRA) before and after mitigation • Design and supervision of Council's preferred mitigation strategy. These aspects of this notable case study are described herein.

Leventhal A.,GHD Geotechnics
Australian Geomechanics Journal | Year: 2011

A multi-unit prestige residential development with views over Pittwater has been developed upon a landform dominated by an ancient landslide. The Development Approval process was required to satisfy the Pittwater Council Geotechnical Policy. AGS (2000) formed an integral part of the Council's approval process under that policy, and was employed to demonstrate that the development could proceed with acceptable landslide risk levels in accordance with the regulators policy.

Stone P.C.,GHD Geotechnics
Australian Geomechanics Journal | Year: 2012

Major landslides occurred along a 25 km length of the railway connecting Sydney and Wollongong, on the south coast of NSW, as a result of significant and long duration rainfall during the El Nino event of the late 1980s. The impacts commenced with the tragic event at Coledale in April 1988, involving a major embankment failure with two fatalities, and culminated in over 100 individual sites being activated along the route. These sites were mainly embankment failures, but also included rock cutting instability, which were identified and treated progressively under a risk priority and safety management system. The repairs, which cost in excess of $70M, were implemented over a number of years, and included an intensive track closure (track possession) of the South Coast Railway during January 1990. The management system was developed, in close association with SRA personnel, with an over-riding early-warning system linked directly to the railway control co-ordinator in Wollongong. The paper presents an overview of the instability experienced on the South Coast Railway, and its remediation at the time, the links to antecedent rainfall, and the philosophy of the risk management system. A selection of case histories is given, with their associated monitoring, and a listing of back-analysed geotechnical parameters is provided for reference purposes. The paper serves to document a presentation given to the Sydney Chapter of the Australian Geomechanics Society in June, 1991 and is intended to be factual as at that time.

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