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Updating the landslide hazard assessment system within the City of the Gold Coast
The City of Gold Coast has a population of over 520,000 people and an area of 1400 square kilometres. The city has variable geology and geomorphology which includes significant amounts of sloping terrain. The project involved a review, revaluation and update of the city wide unstable soils and slope instability susceptibility zoning system and the detailed assessment of the existing planning scheme relating to the development on sloping sites of a medium or higher susceptibility of slope instability. The zoning was based on geology, landforms, climate and history of the project area using a GIS platform. The project incorporated current best practice guidelines for the assessment of slope instability risk and also included updating city wide susceptibility mapping showing numerous landslips that have occurred or been mapped since the original zoning was undertaken in 1999 by SMEC.
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A risk based approach to stabilisation of rock batters
This paper provides a summary of a recent slope stabilisation project for steep rock and soil slopes above an existing road in steep terrain. The necessity for stabilisation was determined by visual risk assessment of sections of the road, using the RTA NSW risk assessment system. Sections of road which were determined to have an unacceptable risk for road users were treated to reduce the risk to an acceptable level. The stabilisation measures adopted included rockbolts, fibre reinforced shotcrete, buttresses, rockfall protection mesh. The uses of these treatments are described in the paper. Also adopted for this project were proprietary rockfall catch fences to retain rockfalls above roads. This is the first application of these particular fences in Australia.
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Site characterisation along the Shipwreck Coast – two case studies using multiple geotechnical investigation techniques
Arup carried out geotechnical investigations at two sites along the cliffs of the ‘Shipwreck Coast’ in 2018. Proposed project works include a cantilevered steel box truss lookout at the existing 12 Apostles Castle Rock lookout (The Saddle Lookout), and a viewing platform spanning the cavern to the north-east of the Blowhole at Loch Ard Gorge (The Blowhole Lookout).
The geotechnical site investigations comprised borehole drilling and imaging, geophysics, and RPAS LiDAR and photogrammetry scans.
The sites are located in the Port Campbell Limestone region, with sub-vertical limestone cliffs up to 60m high. The cliffs are actively receding due to physical and chemical weathering. Erosion of the limestone cliffs has created the Blowhole at Loch Ard Gorge, and the steep cliffs and rock stacks at the Castle Rock Lookout and 12 Apostles area.
Careful characterisation of the structure and lithological units was required to input to a probabilistic assessment of future rockfall events impacting the proposed structures. This paper will present the methodology for characterisation, including site investigation and three dimensional modelling techniques. The paper will focus on how site investigation data was manipulated to inform the risk assessment and foundation design. A summary of the geological characterisation of the two sites is also presented.
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2009 E.H. Davis Lecture: Recent Advances in the Application of Vertical Drains and Vacuum Preloading in Soft Soil Stabilization
Buddhima Indraratna, PhD, FIEAust, FASCE, FGS, CEng, CPEng.
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Short course: Finite Elements in Geotechnical Engineering
Professor D. Vaughan Griffiths