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Optimising Precast Cantilever Walls Founded In Sydney Sandstone
Linear Infrastructure projects requiring grade separations have historically used a multitude of retaining wall systems, such as gravity, piled and reinforced soil structures (RSS), depending on ground conditions. L-shaped cantilever cast in- situ walls have been used extensively in road projects in the Sydney region. These walls are costly as they use a significant amount of concrete and steel, while achieving an aesthetically pleasing finish is difficult. Such walls may not take full advantage of rock foundations prevalent in the Sydney Basin. This paper presents an updated concept for optimising retaining walls under appropriate conditions, combining precast and cast in-situ elements while increasing the effectiveness of the load transfer mechanism to the ground.
In essence, this system is a retaining solution comprising full-height precast wall facing units secured to a cast-in-situ footing forming a monolithic cantilever concrete wall. The facing units are each precast with a set of counterforts on the rear side to transfer load to the footing. This paper discusses and investigates both the design of this precast solution, focussing on counterforts and footing, and the adequacy of the solution from a geotechnical point of view, as it relates to the prevalence of rock foundations in the Sydney Basin.
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Geotechnical Site Exploration and GeoEngineering Education in 2013 and Beyond
Dr Paul Mayne, Distinguished Speaker
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Managing slope instability hazards affecting local roads within the city of Wollongong
Wollongong has a spectacular setting on a narrow coastal plain between the Tasman Sea and the Illawarra Escarpment. Its temperate maritime climate in combination with this landscape periodically produces both short term intense rainfall and prolonged periods of high rainfall. A consequence of these rainfall events is that Wollongong is prone to most forms of slope instability but especially rockfalls, landslides and debris flows. Some form of slope instability has been recorded in almost every suburb of the city. The vast majority of these locations are within developed parts of the city. Their management is therefore of vital importance to all stakeholders. This paper discusses the role of Wollongong City Council in its management of slope instability as it affects its road assets.
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Yeager Airport Failure
Stability and Stress-Deformation Analyses of Reinforced Slope Failure at Yeager Airport and Lessons learnt from forensic investigations and modelling
Dr. Jim Collin and Ryan R. Berg