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2024 Australian Geomechanics Victoria Chapter Symposium Proceedings
The Victorian Chapter of AGS is pleased to announce the 2024 AGS Victoria Symposium on ‘Piling and Ground Improvement Applications’ to be held on 18 September 2024.
The symposium forms part of the continuing program of events organised by the Victorian Chapter of the AGS and is designed to showcase piling and ground improvement applications in the regional geological setting. This symposium will be held as a face-to-face event in Melbourne.
The construction industry has experienced a significant increase in piling and ground improvement works in recent years driven by development of major road and rail infrastructure projects under Victoria’s Big Build Scheme and construction of high-rise residential and commercial buildings in the CBD and suburban town centres. Fishermans Bend Development precinct, labelled as Australia’s largest urban renewal project and located within the Yarra Delta, will require significant piling and ground improvement works and is another example of such developments. In many cases these construction activities require piling and ground improvement works to be carried out in areas with space constraints, limits on ground vibration, noise and offsite impacts while ensuring the safety of workers and the durability and integrity of the foundation support system. Increasingly, these activities are occurring in dense urban environments and benefit from supporting instrumentation, monitoring and early warning systems.
The piling and ground improvement solutions can vary greatly depending on the geological setting, which in Melbourne, ranges from compressible soft soil in the Yarra Delta, reactive soil and high strength rock in the basalt plains and weak rock associated with the bedrock underlying Melbourne. Tailored ground engineering solutions in piling and ground improvement works are often required to achieve project objectives in these diverse geological settings.
Research work on piling and ground improvement has undergone considerable expansion in recent decades, driven by advancements in materials, design and construction techniques. This research is being propelled in part by the exploration of recycled materials, eco-friendly binders, innovative cementitious materials and emerging technologies aimed at improving piling and ground improvement methodologies.
The Symposium aims to provide a platform for geo-professionals to exchange insights and ideas on piling and ground improvement applications with a particular focus on addressing challenges in the local geological setting including Melbourne and regional Victoria.
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A practical application to Ramamurthy et al. Strength criterion based on lab data analysis of different rock types and coal
The Original Ramamurthy et al. (1985) criterion propose the estimation of rock strength under compression forces. This criterion includes two constants B and α, which account for properties of different rocks. The validity of the strength criterion depends on the number of the data used to extract these constants. In this paper a wide range of triaxial lab data corresponding to various rock types reported in the literature was used to determine constants B and α in Ramamurthy’s failure criterion. In addition these constants were determined for coal using cores taken at different angles with respect to its foliation planes: this allowed taking the isotropic transverse behaviour of coals into account. To fit the best curve to the data both linear conversion model (LCM) and nonlinear regression model (NRM) were applied. The results of the analyses and the proposed constants for different rock types and coals are presented.
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A Study Of Problem Complexity And Expertise In Making Judgement Decisions Fof Waste Cover And Tailings Dam Safety
Engineers, particularly geotechnical engineers, often rely on judgement to integrate various controlling factors during design. Engineers learn heuristics as they gain experience, however these have limitations and their application is dependent on problem complexity. This paper sought to investigate the role of problem complexity on judgement by carrying out a survey of geotechnical practitioners. Two questions about design safety were posed: one regarding a tailings dam and another on a waste cover. Respondents were randomly divided into two groups, and for each of the two questions, one group received slightly more information than the other. For the tailings dam question, for which several factors control safety, responses, regardless of experience, were unaffected by providing more information on one primary variable. In contrast, for the cover design question, where fewer factors control safety, experienced respondents were strongly influenced by providing more information about one primary variable. This illustrates how judgement decisions, regardless of experience, are difficult for problems with several controlling variables. Worryingly, some experienced respondents provided with quantitative strength data, made unconservative estimates of cover stability. This highlights that even for simple problems, judgement-based decisions should be carefully interrogated.
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Volume 36, Number 4 — Other
Table of contents, editorial and chairman’s column for Australian Geomechanics, Volume 36, Number 4.
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Practice Note guidelines for landslide risk management
Slope instability occurs in many parts of urban and rural Australia and often impacts on housing, roads, railways and other development. This has been recognised by many local government authorities, and others, and has led to the requirement by many local government councils for stability assessments prior to allowing building development.
In 2000, the Australian Geomechanics Society (AGS) published “Landslide Risk Management Concepts and Guidelines” (AGS 2000). Since then there have been many published papers and discussion which have progressed Landslide Risk Management (LRM) in particular and risk management in general. As a consequence, AGS considered it appropriate to develop more comprehensive guidelines for practitioners and regulators involved in LRM.
This Practice Note Guidelines for Landslide Risk Management (the Practice Note) and its Commentary (AGS 2007d) are one part of a series of three guidelines related to LRM that have been prepared by AGS with funding under the National Disaster Mitigation Programme (NDMP). That programme has been introduced by the Australian Government to fund disaster mitigation, addressing hazards such as flooding, bushfires and landslides.
The associated guidelines which should be read in conjunction with the Practice Note are:
- AGS (2007a) “Guideline for Landslide Susceptibility, Hazard and Risk Zoning for Land Use Planning”.
- AGS (2007e) “Australian GeoGuides for Slope Management and Maintenance”.
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Volume 37, Number 3 — Other
Table of contents, editorial and chairman’s column for Australian Geomechanics, Volume 37, Number 3.
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2023 Australian Geomechanics Victoria Chapter Symposium Proceedings
The Victorian Chapter of the Australian Geomechanics Society (AGS) is pleased to announce the 2023 AGS Victorian Symposium titled “Novel Solutions in Geotechnical Engineering” to be held on 25 October 2023.
The symposium forms part of the continuing program of events organised by the Victoria Chapter of the AGS. The event is designed to showcase recent novel solutions and innovations to address geotechnical challenges in practice. This symposium will be held as a face-to-face event in Melbourne.
For the past decade, Australia and particularly Victoria has seen an unprecedented boom in infrastructure investment involving mega-projects, transport and rail developments. These significant infrastructure developments have generated new geotechnical challenges due to complex geological condition, spatial variability of the ground and urban construction. Adding to these challenges are the need for higher efficiency, cost saving and consideration for sustainable developments. All these challenges and requirements have spurred novel and innovative solutions across all aspects of geotechnical engineering.
Fuelling the geotechnical creativity and innovations is the advancement in technology and knowledge, which allows novel solutions and tools to be developed to tackle these geotechnical challenges using a variety of approaches (e.g. advanced numerical modelling, physical testing, data-driven solutions, field instrumentation and monitoring).
This symposium seeks to bring together the local geotechnical community to share and discuss recent geotechnical advances, with a particular emphasis on tackling the geotechnical challenges in the Melbourne region and regional areas of Victoria. To promote engagement with young engineers, the Symposium also hosts an inaugural Young Geoprofessionals Poster Exhibition. In addition, a Heritage Time Capsule (HTC) session has been included to collect feedback from the geotechnical community regarding Geo-Education (current state, needs and challenges) in an Australian context. This valuable feedback will contribute towards the development of our next generation geotechnical workforce.
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Volume 38, Number 1 — Editorial, View from the Chair, and News
Table of contents, editorial and chairman’s column for Australian Geomechanics, Volume 38, Number 1.
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Volume 37, Number 5 — Other
Table of contents, editorial and chairman’s column for Australian Geomechanics, Volume 37, Number 5.
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Performance of footings in rock based on serviceability
Around the world, there is a demand for larger structures, tall buildings and large bridges. While good footing design is important for all structures, it is even more important in the case of large structures. Recent experience with footing design for tall buildings (e.g. Burj Al Alam development and Nakheel Tower in Dubai, the Gate of Kuwait in Kuwait, the City Centre Project in Bahrain and Eureka Tower and Freshwater Place in Melbourne) has shown the benefits of investing in footing planning, design and construction (Haberfield, 2011, Poulos and Bunce, 2007).
The footing systems for most of these projects include the use of deep bored piles or barrettes (piles of rectangular cross-section). Many use piled rafts where the piles, while acting to support the load, are primarily used to reduce settlements. A clear understanding of the factors controlling the behaviour of the footing system is needed to enable a good engineering design to be achieved. This starts with a sound understanding of the ground characteristics and individual pile performance, including adequate collection of data and testing. The best footing solution can then be found using recent improvements in data collection and analytical techniques, complex and highly capable computerbased models and the availability of high-speed computers.
This paper focuses on the axial performance of deep bored piles socketed into rock – both their individual performance and their performance as part of a larger footing system. Recent research and construction practice is discussed. In practically all cases, serviceability conditions control the behaviour of the footings. Methods of establishing the parameters for input into sophisticated computer programs are described. Application of the methods to case studies is included and it is shown that the behaviour of individual piles can be closely predicted. These developments lead to lower construction costs, better constructability and shortened construction time because of the better understanding of footing behaviour.