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Geotechnical investigations for the penstock plug of the Anthony Underground Power Station, Tasmania
From a reservoir on the Anthony River water flows through a headrace tunnel and a short power tunnel to the Anthony Power Station. The last section of the power tunnel into the underground power station chamber is lined with a concrete backfilled steel penstock. This backfilled steel penstock forms a plug to prevent high pressure water in the unlined power tunnel from penetrating into the power station. This paper describes the investigations that were carried out to determine the length of penstock required and to confirm the water tightness of the finally adopted design for the penstock plug.
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Rock strength and the coring interface
Boreholes in rock usually involve drilling to practical tungsten carbide bit refusal and then changing the drilling technique to rock coring. Often this change is used as an indication of a change in rock weathering or strength. Before the commencement of rock coring the SPT result would typically be to refusal. After obtaining the rock core, point load index tests are used to classify the rock strength. This paper examines the validity of the usual assumption of a change in rock property at this drilling interface. The results show that a drilling interface does not necessarily translate into a geological interface or change in rock properties. The current definition of SPT refusal level in rock is shown to be inadequate, and the strength interpretation of such tests in rock is dependent on the rock type and defects of the rock.
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Landslides in the Wianamatta Group, Baulkham Hills Shire, Sydney
This paper describes the geometrical, geotechnical and hydro-geological characteristics of landslides in the Wianamatta Group in the Baulkham Hills Shire, Sydney.
It proposes a strategy for managing the geotechnical risk posed by the landslides on proposed urban development, and suggests remedial works which would allow development with a low risk to property and loss of life.
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Soft Soils Of The Tamar Basin
A brief account is given of the geomorphological history of the Tamar Basin at Launceston in Tasmania, showing how the deep sediments of that Basin have accumulated in the past and continue to accumulate at the present time. The nature of those sediments is described, with particular reference to the problems they pose for flood protection of developed suburbs, for engineering works and building construction on the flood plain, for riverside developments, and for sediment removal (dredging) and the disposal or reuse thereof. It summarises more than 65 years of the author’s accumulated experience on and about this river.
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Lake Tewa – Modular Liner System Using GCLS
For the construction of a man made lake in 2008 at Jack’s Point in New Zealand a unique modular future proof lining system was developed using bentonite GCL as the main liner elements. The main feature of the lake lining system is that provisions were made during design and construction that allowed the further expansion of a 5 ha sized lake (currently completed) by using a modular design. A key benefit is that future expansion can occur without the need to lower the lake water level or adversely affect the recreational water quality. These were some of the requirements made by the client. The lining system was developed as there were no other options available within the project scope and budget that offered the same flexibility, innovation, future proofing and long term project security as the chosen solution. This paper provides details of the modular lake lining system. Design considerations and construction details are presented in detail and potential uses of this modular lining system shown for other uses in civil and environmental engineering.