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Qualifications:
BEng (Civil), Monash University (Clayton), 2000
Affiliations:
The Institution of Engineers Australia, Member (MIEAust)
Australian Geomechanics Society (AGS), Member
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Research:
PhD Research Topic
Ground improvement using geogrid encased stone columns
Date Commenced: 15th November 2005
Stone columns are typically used as a ground improvement technique for soft cohesive soil deposits. Stone column treated ground is generally characterised by improved bearing capacity and load-settlement behaviour when compared to untreated ground. However, for very soft soils where cohesion is less than about 5 kPa, the lateral confining pressure provided by the soil is generally insufficient to prevent bulging and slumping of the column during installation and loading, causing failure. In recent years, a geotextile sock has been developed to encase granular columns, providing the necessary confinement. The innovative technique has been used on numerous projects in Europe and South America in soils with extremely low strengths. This study investigates the use of an alternative material, geogrid, to encase stone columns. Geogrid encasement is likely to provide a more robust alternative to geotextile and may therefore be used with gravel and crushed rock (rather than sand). It may also provide a stiffer foundation solution. The study will use small-scale laboratory modelling, finite element modelling and medium-scale testing of columns to provide further insight into geogrid encased stone column behaviour.
Supervisor:
Associate Professor Abdelmalek Bouazza
Dr. Chris Haberfield
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Publications:
Gniel, J. & Bouazza, A. (2007). Methods used for the design of conventional and geosynthetic reinforced stone columns. Proceedings of 10th Australian New Zealand Conference on Geomechanics, Brisbane, Australia. Vol. 2, pp. 72-77.
Gniel, J. & Bouazza, A. (2008a). Model tests on geogrid encased stone columns. Proceedings of 4th European Geosynthetics Conference, Edinburgh, Scotland.
Gniel, J. & Bouazza, A. (2008b). Numerical modelling of small-scale geogrid encased tests. Proceedings of 2nd International Workshop on Geotechnics of Soft Soils, Glasgow, Scotland, pp. 143-149.
Gniel, J & Bouazza, A (2008c). Predicted site behaviour of geogrid encased stone columns. In Proceedings of 8th Young Geotechnical Professionals Conference, Wellington, New Zealand. pp. 79-84.
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Short Resume:
2005 - Present:
PhD, Monash University, Clayton
2004 - 2005:
Geotechnical Engineer, Golder Associates Pty Ltd, Melbourne, Australia
2003:
Geo-Environmental Engineer, WSP Environmental Pty Ltd, Basingstoke, United Kingdom
2000 - 2003:
Geotechnical engineer, Golder Associates Pty Ltd, Melbourne, Australia
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