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A new practical modification to the pressure plate extractor for measuring the wetting portion of SWCC
Soil Water Characteristics Curve (SWCC) is a graphical representation of the soil’s ability to retain water. To fully understand the soil behaviour of retaining water, a complete cycle of drying and wetting of SWCC should be measured. In common practice, SWCC measurement is limited to the drying phase only, as all the SWCC apparatuses can measure it, unlike the wetting phase which needs special attachments, modification or even certain apparatus. The pressure plate extractor in its ordinary configuration can only measure the drying phase of SWCC. This paper presents a practical modification on the pressure plate extractor (PPE) so that it is able to measure the wetting phase as well. For the purpose of verification, SWCCs from the modified apparatus and the double-walled triaxial test were measured and compared. The results from both apparatuses have shown very good agreement.
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Ok Tedi Crusher Replacement Project: The Geotechnical Challenges Of Constructing Infrastructure On Top Of Soft Tailings In Remote PNG
The Ok Tedi mine in Papua New Guinea needed to relocate their crusher infrastructure prior to an open pit cutback, and several project requirements and constraints including steep terrain and difficult time frames drove it to be built over the top of mine processing waste (tailings) up to 30 m in thickness. Consequently, geotechnical aspects of the project were a significant part of the design process and governed many of the construction decisions. This paper focuses on the consolidation and shear strength parameters of the tailings, and how the model evolved from an early concept, into one informed by targeted site investigations. Ultimately, loading trials on site with careful monitoring of settlement and pore pressures allowed the geotechnical model to be verified and refined based on actual field performance. It also presented a good opportunity to reflect on the influence and benefit each site investigation had on the geotechnical model and the resulting design decisions. The final part of this paper reflects on the overall design process, construction outcomes and lessons learnt.
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West Australian Geotechnics and Geology
AGS WA 2020 Symposium
Russell Clayton, Prof. Barry Lehane, Eric Hudson-Smith and Alison Jennings
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Debris Flow Hazard In Tasmania, Australia
Debris flow hazard in Tasmania has been largely under-appreciated until recently, and accordingly, emergency management plans are in the early stage of formulation. In this study the geological, historical, and contemporary evidence for debris flow processes in Tasmania is reviewed. From a landslide inventory, a geomorphic process rate with a derived magnitude-frequency power-law relationship was calculated in order to estimate event volumes, which are then used to derive input for numerical simulations. Specialised debris flow runout software was employed to predict at-risk areas in a similar fashion to standard design-event flood modelling practice. The rheological parameters chosen for each model were based on calibration with a limited number of past events. However, this small calibration dataset revealed contrasting properties, and our simulations represent a ‘worst case scenario’ within a spectrum of possible flow behaviours. Finally, the communications processes being used to share these results with Tasmania’s emergency management community is discussed.
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WA Symposium 2021
Geotechnics in Mining & Infrastructure
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Australia and New Zealand Geotechnical Design Challenge
Conservatism in Geotechnical Practice
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The Queensland Geotechnical Database
The Queensland Geotechnical Database (QGD; qgd.org.au) was launched in October 2017 with the aim of consolidating primarily tax and toll-payer subsidised geotechnical investigation logs into an open platform. The QGD was influenced by public geotechnical databases in the United Kingdom and New Zealand, and the work of Robert Leggett in Canada as summarised in ‘Cities and Geology’ (1973). As of October 2023, the QGD includes over 3100 geotechnical investigation logs authored by over 10 public and private entities, dating back to 1966. It also includes national geological mapping and links to over 400 technical papers related to sites in Australia.
This paper summarises the formation of the QGD, which emerged from the Queensland Chapter of the Australian Geomechanics Society (AGS) and originated from a personal database converted to an open format with hosting support from The Open Data Institute Australia. The QGD was later transferred to The University of Queensland and continues there in support of their Sustainable Infrastructure Research Hub (UQ SIRH). The paper explores the evolution of its formation, the legal framework in Australia regarding investigation log ownership, and the licensing scheme adopted for the database. It outlines the technical features and intended practicality of the database, and its alignment with the objectives of the UQ SIRH. The paper concludes with an outline of opportunities for conversion to a nationalised Australian Geotechnical Database and its usage for educational purposes.
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Earthworks For Waterside Green, Penrith, NSW, Australia
A residential and commercial subdivision, known as Waterside Green Development, in Penrith NSW, is situated in low- lying land affected by high groundwater table and the presence of saline and sodic soils. The subdivision comprises a commercial area, a residential area, internal roads and several lakes and laterals. The Development Control Plan (Penrith City Council, 2004) states that the drainage and stormwater management system across the site should be improved and future dwellings and roads should be constructed on ground higher than the 1 in 100 year flood level, without the necessity to import fill material. Therefore, earthworks for the subdivision comprised excavation of a series of lakes and laterals to improve drainage and stormwater management systems and use the materials gained from the excavations to construct fill platforms in order to raise ground levels above the 1 in 100 year flood level. This paper presents earthworks specifications and procedures for construction of fill platforms and clay liner.