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An Introduction to the Geology of Geelong and Surrounds
Evening Presentation and Geology Field Trip
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Young Geotechnical Professionals’ Seminar & The 20th Dr Baden Clegg Award
Rachel Cheung, Eduardo Bittar Marin and Max Kulessa
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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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An Investigation Of Seasonal Effects On In Situ Test Parameters In Perth Sand
This paper presents the results of a study into the effect of the seasonal nature of rainfall in Perth on the measurements obtained from CPT tests in unsaturated sands at a site in Perth. The site is located in the Spearwood dune system, which extends in a North-South trend through the central part of the Perth metropolitan region. Rainfall in Perth is concentrated in a wet winter season (June to September), with very little rainfall occurring between about the end of November and the middle of May. The study involved carrying out CPT qc measurements and seismic CPT tests (to determine the initial tangent shear stiffness Go) at the end of the wet season and the end of the dry season at the site. Tests were carried out in ‘open areas’ and in areas with native trees. The results show that there is a very significant seasonal effect on qc and Go values, but that this occurs only the treed areas; in ‘open areas’, there is no seasonal effect. This effect is therefore most likely to be due to the suctions induced by the water uptake by trees.
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The establishment of a field site for reactive soil and tree monitoring in Melbourne
Trees have long been known to cause damage to pavements and residential buildings as a result of soil desiccation by tree roots. As part of a long term study of the effects of trees on the performance of residential structures, a field site was established in early 2011 in Melbourne. This paper details the site selection, establishment and instrumentation, and provides some of the preliminary results.
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AGS NSW Research Award 2018
for Research in Geotechnical Engineering or Engineering Geology PresentationsDongli Zhu, Liet Dang, Ruoshi Xu, Subhani Samarakoon Jayasekara Mudiyanse and Xinyu Ye
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The design and construction of the 16 hectare basement at Marina Bay Sands, Singapore
Jack Pappin, Arup Fellow
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A Stabilised Finite Element Method For Modelling Fluid Flow And Contaminant Migration In Geosynthetics
A stabilised Petrov-Galerkin Laplace finite element method (SLFEM) for the modelling of flow and contaminant transport in multi-layered containment systems comprising a geosynthetic clay liner (GCL) is developed. The method determines the hydraulic regime as well as the time-dependent transport of contaminants in the system. It can accurately represent the sudden jump in Darcy velocities close to leaks in the geomembrane. It is implemented in the computer software, Soil Pollution Analysis System (SPAS) with an easy-to-use graphic interface. The coupled equations of flow and transport are first presented, as well as the SLFEM formulation. The main features of SPAS are described and a case study of the transport of trichloroethene in a single composite liner is analysed. Finally, the usefulness of SPAS and more generally concentration-based assessments of geosynthetic liners in 2D space is discussed.
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Performance of Industrial Concrete Slab on Ground in Particular Edge Effects
The design of warehouse slabs on grade is often controlled by deformation requirements and in particular, floor tilts and curvatures. These deformations can be experienced by the slab either due to the imposed loads and/or reactive soil movements.
In this paper, the authors discuss measures around the building edges typically adopted to control shrink-swell movements and present some field survey data showing the shrink-swell movements on the warehouse slabs internally. The ability of rigid pavements (e.g., concrete pavements) and flexible pavements (e.g., bituminous pavements) to act as effective seals to mitigate the shrink-swell effect on the edge of these warehouse slabs is discussed. Further the paper shows examples where failure to provide an effective seal can result in slab performance outside the typically required range, especially in more sophisticated racking systems such as the Automated Storage and Racking System (ASRS). The paper also discusses the importance of maintenance of the external pavement of a building (e.g., sealant and joints) throughout the life of the building to limit water ingress to the subgrade and to achieve an effective “seal” to mitigate the shrink-swell effect on the edge of these warehouse slabs.