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FE Modelling of Polymeric Geogrids for Stabilising Soil
Presented by Dr Andrew Lees (Tensar International)
Conventional methods of modelling geogrid as tensile membrane elements in FEA models does not capture well the stabilising effect of multi-axial Tensar geogrid on granular soils, leading to significant under-prediction of performance at serviceable strain levels. This has been overcome by taking a new approach to characterising geogrid-stabilised soil. This involves both testing and modelling the soil and geogrid together as one material, thereby simulating the effect of Tensar geogrid on soil rather than the geogrid itself. The development of this novel approach will be presented along with examples of the significantly improved predictions obtained with the new method compared with conventional methods.
Dr Andrew Lees is a geotechnical engineer with specialist knowledge and 18 years’ experience of the practical application of numerical analysis tools in geotechnical design and has published extensively in this field. He graduated with a B.Eng. in Civil Engineering at the University of Southampton in 1996, where he also obtained a PhD in the field of centrifuge modelling and FEA of soil-structure interaction in 2000. He was then a geotechnical engineer at Mouchel International until 2004 when he took up a lectureship at Frederick University, Cyprus where he taught geotechnical engineering until 2015. In 2007, he also set up and continues to run the successful consultancy Geofem specialising in geotechnical FEA. In 2016, he was also appointed Senior Application Technology Manager at Tensar International where one of his tasks is to improve techniques of modelling geogrid-stabilised soils by FEA. He is particularly active in the development of new techniques and guidance in geotechnical numerical analysis through his participation in the redrafting of Eurocode 7 and his role as scientific coordinator of the European COGAN Project on competency and training in geotechnical numerical analysis. He authored the textbook Geotechnical Finite Element Analysis published by the ICE in 2016 as well as the NAFEMS guidebook Obtaining Parameters for Geotechnical Analysis. He is a Chartered Engineer and member of the ICE and BGA
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