Kelly, P. and Black, J.A. (2015) Physical modelling of soil structure interaction in stone column foundations. In: Winter, M.G., Smith, D.M., Eldred, P.J.L. and Toll, D.G., (eds.) Proceedings of the XVI ECSMGE. XVI European Conference on Soil Mechanics and Geotechnical Engineering, 13-17 Sep 2015, Edinburgh. Geotechnical Engineering for Infrastructure and Development , 7 . ICE Publishing , pp. 4129-4134. ISBN 9780727760678
Abstract
The development of transparent synthetic soil has enabled non-intrusive measurement of internal soil displacement and detection of pre-failure strains using laser aided imaging and Particle Image Velocimetry. The work described in this paper applies this novel methodology to evaluate the deformation and failure behaviour of stone column foundations in reduced scale physical models. Four tests have been conducted on 18mm diameter isolated columns of area replacement ratios (Ar) equal to 5, 3.3 2.5 and 1, installed in a 220mm test bed. Visualisation of real-time internal displacement has indicated that an isolated stone column fails mostly through a combination of compression and bulging with a negligible amount of end bearing failure. At all levels of foundation displacement, it was seen that the geometry of the footings interacted with the geometry of the individual columns in protecting the upper column from bulging and producing an eventual failure mechanism for the composite foundation, therefore governing the ultimate bearing capacity of the foundation too. Increasing footing size and correspondingly increasing Ar from 1 to 2.5, to 3.3 and then 5 was seen to increase load capacity by 21%, 54% and 108% respectively. These findings have important implications for design as current design practice is based on cylindrical cavity expansion theory whereby the size of the foundation itself is not considered.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Editors: |
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Copyright, Publisher and Additional Information: | © The authors and ICE Publishing 2015. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 18 Jan 2018 10:05 |
Last Modified: | 18 Jan 2018 10:05 |
Published Version: | https://www.icevirtuallibrary.com/doi/abs/10.1680/... |
Status: | Published |
Publisher: | ICE Publishing |
Series Name: | Geotechnical Engineering for Infrastructure and Development |
Refereed: | Yes |
Identification Number: | 10.1680/ecsmge.60678 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:125642 |