Smith, C.C. and Gilbert, M. (2013) Identification of rotational failure mechanisms in cohesive media using discontinuity layout optimization. Geotechnique: International Journal of Soil Mechanics, 63 (14). 1194 - 1208. ISSN 0016-8505
Abstract
Discontinuity layout optimisation (DLO) is a generally applicable numerical limit analysis procedure that can be used to identify critical plastic collapse mechanisms in geotechnical problems. Previous research has focused on using plane-strain DLO to identify mechanisms that are purely translational, or which involve rotations only along predefined boundaries. In this paper a more general formulation, capable of identifying mechanisms that can involve arbitrary rotations and/or translations in cohesive media, is presented. The formulation is then verified through investigation of the yield surface and evolution of the collapse mechanism associated with a footing under combined vertical and moment (V, M) loading, and through study of the well-known anchor uplift problem. It is shown that results of very high accuracy can be obtained, in terms of the collapse load and of the predicted failure mechanism. In the light of the new results, the Bransby design formula for combined vertical and moment loading has been modified to improve its accuracy. Additionally, the more general DLO formulation presented is shown to have several inherent advantages compared with existing numerical limit analysis approaches.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013 ICE. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | bearing capacity; plasticity; limit state design/analysis; numerical modelling |
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: | 07 May 2014 14:05 |
Last Modified: | 01 Jul 2014 11:01 |
Published Version: | http://dx.doi.org/10.1680/geot.12.P.082 |
Status: | Published |
Publisher: | ICE Publishing |
Refereed: | Yes |
Identification Number: | 10.1680/geot.12.P.082 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:78702 |