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Seminars on Landslide Risk Management
Landslide Roadshow
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56th Rankine Lecture, Melbourne
Geotechnics and Energy
Professor Richard Jardine, Imperial College London
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Landslide risk management in National Parks: some case histories
Geotechnical hazards which pose risks to both property and the public, one of which is landsliding, often owing to mountainous and rugged terrain, are common within National Park areas. The Illawarra Escarpment State Conservation Area, managed by the NSW National Parks and Wildlife Service (NPWS) contains a coastal escarpment with a well documented history of landsliding. The escarpment stretches from Stanwell Park in the north to near Kiama in the south. Case histories of a landslide at Mt Keira and of rockfall hazards above the Sublime Point Walking Track, presented herein, have been assessed employing the methods within AGS (2000) and AGS (2007). Both case histories provide an insight into the assessment of landslide risk to NPWS infrastructure and the public together with the measures taken to manage such risks.
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Estimation of tunnelling induced ground movements in soft ground – Part 1: Methodology
Accurately estimating tunnelling-induced deformation is important in assessing the effects of tunnelling on nearby structures and facilities. The consequences of inaccurate estimates can also be costly. Any method that provides greater accuracy in the assessment of tunnelling-induced ground movements, thereby providing a design tool to mitigate potential risk to third party property, has the potential to reduce the number of unwarranted incidents and insurance claims. At present, there are no well-accepted methods available to tunnel designers to calculate tunnelling induced ground loss values and ground deformations from the first principles. Instead, designers are required to rely on empirical assumptions derived from past experience and the outcomes of similar projects. However, as no two tunnelling projects are the same, the complexity and risk estimations and the consequences of failure seem to increase with every new project. This paper describes a methodology to assess ground loss values and closed-form formulae for the prediction of tunnelling-induced ground movements.
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The Guildford Formation and its influence on residential construction
The Western Australian residential development industry has evolved practices for the preparation of subdivisional areas over Guildford Formation soils, which require Lot classifications to achieve an ‘A’ or an ‘S’ classification under AS2870-1996, and which require rainfall other than roof runoff, to be managed substantially within the individual Lots rather than by immediate discharge to Local Authority street drainage systems. This paper discusses the current procedures and notes that both issues (soil reactivity and the subsoil drainage necessary to ensure immediate surface runoff to street drainage does not occur) must be considered concurrently. The current practices were developed at an earlier time; with a maturing of the Western Australian engineering market and the development of smaller Lot sizes this paper proposes that it may be time to review the regulatory conditions that are driving current practices.
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A national landslide risk management framework for Australia
The Australian Geomechanics Society (AGS) is publishing a series of benchmark guidelines on Landslide Risk Management (LRM) and slope management and maintenance. This is a continued recognition by AGS of the benefits of risk based systems in managing landslide hazards. This paper provides an introduction to the LRM guidelines that have been developed under the National Disaster Funding Program (NDMP) – with the aim of managing the risk to occupants and property from landslide hazards. These guidelines are tools that can be introduced into the legislative framework of Australian governments at National, State and Local levels and to thereby promote appropriate use of land in recognition that it is a valuable resource which should be developed on its merit.