Evening Talk on Landfill Engineering: Waste/Barrier Interaction
Venue:
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Wisma IEM, 01- Auditorium Tan Sri Prof. Chin Fung Kee, 3rd Floor
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Date & Time:
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02 Jul 2015 (5:30 PM - 7:00 PM)
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CPD: |
2 |
Closing Date Before: |
29-Jun-2015 (Subject to change based on availability of seat) |
Organised By |
Technical Division - Geotechnical Engineering |
SYNOPSIS
Design of landfills must consider stability both within and between elements of the lining system including geosynthetic materials, within the waste and involving the sub-grade. However, the design must also consider the integrity of the lining system. Stresses, and hence deformations, in both mineral and geosynthetic lining materials must be controlled to ensure preferential flow paths for leachate and gas are not formed during the life of the landfill facility. An assessment of integrity requires knowledge of the interaction between components of the lining system and the waste body as it compresses and degrades. Quantification is required of the relative shear displacements within the lining system and the tensile strains in the geosynthetic components. Various researchers have demonstrated through numerical analysis the complex behaviour of interface-waste interaction and the mechanism of stress transfer in a landfill lining system. However, these have traditionally treated the lining system as a single interface using deterministic analyses. This talk will present field measurements that illustrate aspects of waste/barrier interaction. It will consider the use of numerical modelling techniques to assess integrity of lining components, including uncertainties in the significant input parameters through the use of probabilistic analysis. The need to instrument lining systems in order to validate numerical analyses will be highlighted.
PROFILE OF SPEAKER
Dr. Neil Dixon is Professor of Geotechnical Engineering, Loughborough University. He has been a university academic for over 25 years and has 30 years of experience in geotechnical engineering research and practice. He has worked on funded projects and published over 150 refereed publications in the areas of slope failure mechanisms, pore-water pressure regimes in slopes, in situ measurement of soil/waste properties, slope stability assessment, instrumentation development, slope process modelling, landfill barrier design guidance and impacts of climate change studies. Professor Dixon leads the research to develop acoustic emission landslide monitoring using the Slope ALARMS sensors; he also leads the EPSRC funded UK Climate Impact Forecasting For Slopes (CLIFFS) Network and is part of the Future Resilient Transport Networks (FUTURENET) and Infrastructure Slopes: Sustainable Management and Resilience Assessment (iSMART) UK research consortia. Professor Dixon has played a leading role in the development of UK practice in waste containment system design through co-authoring the Environment Agency (England and Wales) reports on landfill stability. This is used as the basis for the current stability risk assessment permitting procedure. He was an elected Council Member of the International Geosynthetics Society for eight years and is a past Chairman of the International Geosynthetics Society, UK Chapter.
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