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Breaking new ground for Geotechnics in Infrastructure Delivery
Technology has had a significant impact on the information available to us in all aspects of our lives. This has allowed us to do things that were previously not possible. Both in our personal lives and in our professional lives.
In the Engineering and Construction sector, technology has allowed for new ways to design and collaborate. Working in a BIM/Digital Engineering based environment changes the way information can be shared and connected. This way of working is mature in the vertical infrastructure (buildings) space and is now also becoming standard practice on civil linear infrastructure projects.
This paper will explore how the technology has changed and what this means for the Geotechnics profession. It will outline how geotechnical engineers take advantage of the information that is being produced. Conversely, how they can utilise similar technology in the way they analyse and communicate their own technical information. It will highlight how technology will allow for improved collaboration between Design, Construction and Geotechnics.
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Geotechnical design and construction aspects of the M80 bridges across Moonee Ponds Creek in Melbourne
This paper describes the design of embankments and piled foundations for new bridges across Moonee Ponds Creek as part of the Melbourne M80 Upgrade Project. The bridges are part of the eastbound duplication and consist of 7 spans (main carriageway) and 8 spans (auxiliary exit). The maximum approach embankment height relative to the existing ground surface levels is 17 m, which is up to 6.5 m higher than the adjacent embankment. Moonee Ponds Creek transects the Newer Volcanics and Melbourne Mudstone forming an incised valley (Moonee Ponds Creek Valley) filled with Quaternary alluvial deposits. Significant settlement was experienced during the construction of the original embankments in the early 1990s. The specification for the new bridges imposed tight settlement requirements. This challenge was compounded by restricted space between assets and a tight construction time frame.
Details of the construction methodology together with the results of settlement monitoring and the monitoring of vibration due to impact rolling and pile driving are presented.
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Introduction to Special Issue: Selected papers from the 12th ANZ conference on Geomechanics, Wellington 2015
The 12th Australia New Zealand Conference (ANZ 2015) on Geomechanics was held in the beautiful city of Wellington, New Zealand from 22 to 25 February 2015. The Australia New Zealand Conference on Geomechanics is held every 4 years, with the first conference held in 1971 in Melbourne.
The New Zealand Geotechnical Society hosted a fantastic conference under the leadership of conference chair Guy Cassidy and editor Graham Ramsay. There were 362 delegates from 19 different countries in attendance.
The conference theme was ‘The Changing Face of the Earth: Geomechanics & Human Influence’ and a series of keynote lectures were delivered around this theme, including lectures from Professor George Gazetas on avoiding over-conservatism in seismic geotechnical design, Dr Fred Baynes on deconstructing geological materials and Professor Jonathan Bray on learning from extreme geotechnical events.
The pre-eminent honorary lectures of the Australian Geomechanics Society and New Zealand Geotechnical Society were delivered at the conference, with Professor John Carter delivering the John Jaeger award lecture on predicting the mechanical behaviour of structured soils and John Wood presenting the NZGS Geomechanics Lecture on geotechnical issues in displacement based design of highway bridges and walls.
This edition of Australian Geomechanics presents a selection of the best papers presented at ANZ 2015. Special mention goes to three award winning papers presented in this edition:
The paper by Hunter, Ballegooy, Leeves and Donnelly, on the development of horizontal soil mixed beams as a shallow ground improvement method beneath existing houses was awarded the Joint Societies award as the best paper at the conference. This paper presents an innovative method of ground improvement successfully used in New Zealand to mitigate against ground liquefaction risk for existing structures.
The paper by Seidel presenting an overview of the role of testing and monitoring in the verification of driven pile foundations was runner up for the Joint Societies award. This paper presents a discussion on the state of the art in pile load testing and how pile testing can be best applied to reduce the overall foundation risk.
The paper by Pathirage and Indraratna (presented by Dr Udeshini Pathirage) on reducing the risk of acidic groundwater through modelling the performance of a permeable reactive barrier in Shoalhaven Floodplain was awarded the Young Professionals award for Australia. This paper discusses an innovative approach to
mitigating risks associated with groundwater generated from acid sulphate soil using reactive barriers comprised of recycled concrete.I trust that you find this selection of papers valuable and we look forward to you joining us for the 13th ANZ conference in Perth, 2019.
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Wharf bulkhead wall geotechnical and structural capacity assessment
The paper presents the outcomes of existing conflicting views between the structural and geotechnical engineers about the approach to assessing an existing wharf retaining structure at Flinders Port, Adelaide. It demonstrates that working together is the only way to obtain a ‘best for client’ engineering solution. The paper summarises geotechnical analysis outputs for structural capacity assessment. Analysis indicates that new crane loads will have a negligible effect on the current Factor of Safety (FOS) for the overall geotechnical stability of the berth. Additional vertical crane loads only affect the vertical load on sheet piles and have little influence on geotechnical and structural capacity against rotational or translation movement.