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Numerical algorithms for large deformation analysis in geomechanics
Majid Nazem, Discipline of Civil, Surveying and Environmental Engineering, The University of Newcastle
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Powering Pile Design through Parametrics
Parametric design skills are increasingly in demand within the engineering consulting industry due to ever-pressing time and budget constraints on medium- to large-scale infrastructure projects. The structural engineering team at Arup examined obstacles and manual processes encountered by the team during the design of a piled noise wall and endeavoured to automate, or at-least streamline, many of them. This resulted in a 94% saving in pile cross- sectional analysis computation time compared to manually inputting pile cross-section and design actions into analysis software and designing the pile using spreadsheets. The teamβs skills in parametric design in Grasshopper, a parametric modelling tool, and basic scripting were leveraged and developed throughout the process, providing an essential way of designing. The pile design process was selected to demonstrate the benefits of the parametric design due to it being a common design task on major infrastructure projects, such as pile wall design. The tool was developed with the intent of it being modular, employing a plug-and-play approach that connected the key stages of the design process with outputs, such as embodied carbon calculations and engineering drawings. McNeel Rhino, a 3D visualisation software, and Grasshopper were chosen for the tool development as they provided a user-friendly, visual programming interface and many plug-ins to existing automation workflows. Thus, enabling the engineer to interrogate the output of each stage of the design process both visually and numerically. The modular approach also enabled engineers to substitute ALP in place of Bromβs calculation, as the design progresses.
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Geotechnical Issues In Construction Of A Large Diameter Raise-Bore Shaft
Major issues were encountered during drilling of a large diameter raise-bored shaft, constructed as part of an underground mine ventilation network. The raise-bored shaft was developed through generally competent, high strength metamorphosed basalt in a high stress environment at depths of +1500 m below ground. Back-reaming was delayed due to blocky ground conditions, leading to ten cutter changes and associated increased costs.
This paper presents details of a geotechnical review of this shaft construction. Analysis of acoustic televiewer (ATV) structural data and seismic data was used to establish the presence of a thin shear causing localized blocky ground as the source of the difficult drilling conditions. Analysis of seismic data collected during drilling is presented as a means to predict difficult back-remaining conditions.
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Foundation Design and Installation for Ichthys Structures
Carl Erbrich and Ian Finnie, Fugro AG
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In-Situ Groundwater Remediation Technology
Professor Liming Hu, Tsinghua University, China
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Coastal rockfall hazard identification, Barwon Heads, Victoria
An investigation of rockfalls at The Bluff, Barwon Heads, Victoria was undertaken as the initial component of a larger Risk Management study. Recent rockfalls are a concern for the management of The Bluff, which is a natural heritage asset and popular tourist destination. Subaerial erosion was found to be the predominant slope forming process with variations in slope morphology dependant on the presence of erosion resistant calcrete capping. Spatial variation of rockfall types is controlled by the orientation of bedding in relation to the slope face, and the development or presence of overhangs. Eight distinct modes of failure were identified. Significant changes in the morphology of the rock mass and sixty-three rockfall events were identified through the analysis of historical photographs, indicating active erosion at The Bluff over the past 100 years. Recent rockfall events have coincided with periods of high rainfall, which has been identified as a major trigger. Rock strength parameters and mechanical properties were determined by laboratory testing and the test results were used to investigate the failure mechanics. Back analysis of failed blocks has shown that that failure is influenced by larger scale rock mass features, rather than rock property strength.
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Case study: Assessment of the shaft capacity of a driven pile in sand using CPT based methods
A number of CPT-based pile capacity prediction methods have recently been presented that claim to take friction fatigue into account. These methods were used to assess the shaft capacity of a 1.54m diameter steel tubular pile, driven to 40m depth, which showed substantial friction fatigue during driving. All of the methods over-predicted the shaft capacity at the end of drive. After a 34 day period to allow the pile to set-up, the NGI and UWA methods were found to most closely predict the shaft capacity inferred from a dynamic restrike test. The ICP method also produced similar results when an exponent of -0.5 for driven piles was used on the h/D ratio instead of -0.38.