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Large Earthquake Recurrence In New South Wales: Implications For Earthquake Hazard
The Australian continent is actively deforming at a range of scales in response to far-field stresses associated with plate margins and buoyancy forces associated with mantle dynamics. On the smallest scale (101 km), faultrelated deformation associated with far-field stress partitioning has modified surface topography at rates of up to ~100 m per million years. This deformation is evidenced in both the record of historical earthquakes and in the pre-historic record in the landscape. Palaeoseismological studies indicate that few places in Australia have experienced a maximum magnitude earthquake since European settlement because there are faults in most areas capable of hosting potentially catastrophic earthquakes with magnitudes in excess of 7.0. New South Wales is well represented in terms of its pre-historic earthquake record. Seismogenic faulting in the last 5-10 million years is thought to be responsible for locally generating up to 200 m of the contemporary topographic relief of the Eastern Highlands. Faults west of Sydney belonging to the Lapstone Structural Complex, and faults beneath the greater Sydney region, are associated with infrequent damaging earthquakes. Therefore, decisions relating to the siting and construction of the built environment should be informed using knowledge of local neotectonics.
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Letter to the editor, Re: Clark, P, (2021) Improvements to the Observational Method in New South Wales Road Tunnel Construction, Australian Geomechanics Society, Sydney Chapter Symposium, November 2021, pp 89-98
In his paper at the Australian Geomechanics Society Sydney Chapter 2021 Symposium, Clark (2021) suggests improvements in applying the Observation Method (OM) to tunnelling in Sydney. The authors would like to thank Mr Clark for raising a number of clearly very important issues in his publication which warrant further examination. Whilst views and opinions amongst professionals will sometimes differ, it is acknowledged that no process is ever perfect and as representatives of various design organisations, we want to respond to some of the discussion points raised. An investigation into the improvements of the observational method for Road Tunnel Construction is an important matter and we value the opportunity to share further discussion points on this topic.
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Prediction Of Force Exerted On Stabilizing Sheet Piles In The Sliding Slope
This paper attempts to investigate the concept of forces acting on sheet pile installed in sliding slope. A new analytical formulation is proposed to reinforce the sliding slope. The equilibrium equation is formulated, and a new relationship is proposed to calculate the force exerted on the sheet pile. When the slope is stable the minimum force and moment are exerted on the sheet pile; however, when the slope starts to move the moment and force exerted on the sheet pile are increased. A reduction of 5 kPa in cohesion increases the force exerted on the sheet pile by about 180 kN/m. By reducing the friction angle by 5 degrees, the force exerted on the sheet pile is increased by about 50 kN/m. The proposed analytical formulation is shown good agreement with numerical analysis.
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The Magic of Sands
Prof David Muir Wood
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YGP Jack Morgan Award Presentation
Pablo Toro, Rick Walsh, & Jared Fetherston
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Tailings Dam Failures
What can we learn and how can we better operate tailings dams?
Sean Sullivan, Dr Bruce Brown, Wade Ludlow and Prof David Williams
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Slope design process in a mining context
William Sarunic