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Urban Stormwater and Groundwater Management for Water Sensitive Urban Design Outcomes
Bill Till MIEAust CPEng.
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Lessons from a historical perspective: Part 2, Slope stabilization by depressurization
This Part 2 contains design aids that are newish, but in reality are extensions of Skempton’s work of 40 years ago that is presented in Part 1 (Pells, 2015). These are charts for depressurisation of landslides and pit slope faces. While they assume geological conditions that are effectively homogenous on the macro-scale, they can provide guidance for more complicated situations.
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Use of wireline logs to prescribe strata hydraulic conductivities at Ulan Underground Coal Mine
Impacts of mining on regional groundwater systems are commonly assessed using numerical groundwater flow models which require an understanding of the strata matrix hydraulic conductivities. A rapid, reasonably accurate and relatively low cost option for assessing the conductivity is laboratory testing of rock core obtained from exploration boreholes. Core measured hydraulic conductivities can also be correlated to wireline logs that are routinely run in exploration boreholes. Simple bi-variate correlation can provide a means of assessing the uniformity or otherwise, of the hydraulic conductivity distribution but multi-variate correlations using genetic algorithms can offer an alternative and possibly superior methodology for predicting hydraulic conductivities. Core tests undertaken at Ulan Coal Mine as part of a groundwater management program have been correlated to natural gamma, density and neutron logs using a genetic algorithm employing a backward propagation neural network. The procedure has been used to generate continuous vertical profiles of hydraulic conductivities in numerous exploration holes where coring was not undertaken.
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Shallow Replacement Of Expansive Or Swelling Soils
In the June 2020 issue of NZ Geomechanics News ‘The Shrink Swell Test: A Critical Analysis’, Rogers et al., 2020, was published. This article provided an overview around the use of the Shrink Swell Test and current design practice for foundation design in NZ’s expansive soils in accordance with AS 2870:2011 site soil class.
This paper provides an additional summary of the currently existing methods/ways for identification of expansive soils (defined herein as soils susceptible to both swelling and shrinkage) and presents a discussion on recently observed construction practice comprising shallow 500mm replacement of expansive soils with compacted granular fill as a ‘measure’ to reduce the deformation of the expansive soils and mitigate the risk of structural damage to a slab foundation.
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Ground Improvement Of Granville Harbour Wind Farm Foundations Using CMC
Granville Harbour Wind Farm is located on a remote site that is approximately 35 km northwest of Zeehan on Tasmania’s west coast. The project includes 31 wind turbines with the capacity to generate 112 MW of power when it is complete. Each giant turbine is 137 m from ground level to rotor hub and 200 m from ground level to blade tip. The site’s ground profile consists of extremely weathered to highly weathered volcaniclastic breccia overlain with stiff clays, silts and embedded basalt cobbles. At 27 turbine locations, the ground did not meet the project’s requirements and specific measures were required to improve the foundations’ behaviour. Whilst piling is commonly used for improving bearing and reducing ground settlements of foundations of highly sensitive structures, in an innovative first-time approach in Australia, an alternative foundation solution using Controlled Modulus Column (CMC) rigid inclusions was considered and developed to allow the safe operation of the turbines more affordably. During this process, foundation systems were designed for eight ground models. Approximately 44,000 m of CMC were installed to support the wind turbines. The longest and shortest columns were respectively 4.5 m and 22.8 m. Quality control and assurance included the installation of trial columns, concrete testing, integrity testing and static load testing of the columns.
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Mine Tailings Management: An overview
Dr. Behrooz Ghahreman-Nejad and Keith Seddon
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The 2010 Poulos Lecture : Modelling of Erosion
Prof. David Muir Wood, University of Dundee, Scotland