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Load carrying geosynthetics reinforced bridge abutments
Online Webinar, via Zoom
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Building 3D models of rock strength using geophysical logs
Professor Peter Hatherly
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Use of recycled materials in road pavements
Colin Leek, Project Engineer, City of Canning
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Medium density residential development upon an ancient landslide in Pittwater LGA
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.
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Harbour deepening at Fremantle port
Fremantle Harbour, as with many established harbours around the world, is aiming to keep pace with worldwide shipping trends by catering for larger, wider and deeper-draught container vessels. It will be necessary to dredge the Inner Harbour at Fremantle to cope with these larger vessels.
A study of the impacts of proposed dredging of the Inner Harbour with regards to berth stability and deformation was undertaken. The requirement to undertake the study came about through recognition that the proposed harbour deepening has the potential to reduce the stability of the under-berth batters which form the sides of the harbour, and thus potentially affect the quay structures and port operations.
This paper describes part of the investigation into the berth stability issues at Fremantle Port which could arise as a consequence of ongoing dredging and increasingly heavily loaded wharf structures. Topics covered include the first approaches to the problem and increasing refinements, including finite element modelling, that were undertaken in an attempt to understand the potential failure mechanisms associated with ongoing dredging and the solutions recommended to allow the development to take place.
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Slope Failure In A Complex Volcanic Terrain, Opito Bay, Kuaotunu, Coromandel Peninsula
The Ohinau Drive slope failure has occurred at the northern base of the volcanic Tahanga Hill, Opito Bay. The failure has affected a recent subdivision on Ohinau Drive situated immediately adjacent to the hill. The slide is a complex, variable depth failure encompassing several differing geological units. It extends a distance of 170 m from headscarp to toe with an estimated maximum width of 130 m. It comprises both shallow-seated and deep-seated failure mechanisms to a maximum depth of approximately 20 m. In the winter of 1996 slope instability was recognised following development of a headscarp and ongoing disturbance to kerbing and manholes.
Investigations undertaken revealed complex geological conditions generally comprising hydrothermally altered andesite partially overlain by basaltic debris and weathered basalt lava. Artesian water pressures were encountered within the andesite. The investigation results indicate that both a deep-seated failure through the underlying andesite and a shallow-seated movement involving the basalt debris were recently active. A geotechnical model was constructed along two cross sections with computer aided stability analyses undertaken. Target groundwater levels were determined to achieve a satisfactory Factor of Safety to allow future subdivision development. Drainage installation and monitoring is yet to be established following liaison with Council.