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A 2D DEM mono-pile model under combined loading condition

Duan, N; Cheng, YP; (2014) A 2D DEM mono-pile model under combined loading condition. In: Soga, K and Kumar, K and Biscontin, G and Kuo, M, (eds.) Geomechanics from Micro to Macro. (pp. pp. 577-582). CRC Press-Taylor & Francis Group: Cambridge, UK. Green open access

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Abstract

This paper presents a 2D-Discrete Element Method (DEM) model that is used to study situations when vertical, lateral and combined loads are applied to a rigid mono-pile. At present, mono-pile foundations are widely used to support tall and heavy wind turbines, which are subjected to significant wind and wave actions. A safe design must address issues such as rotations and changes in soil stiffness subject to these loading conditions. Design guidance on the issue is limited, as well as the availability of laboratory and field test data. The interpretation of these results in sand, such as the relation between loading and displacement, relies mainly on empirical correlations to pile properties. Regarding numerical models, only data from Finite Element Method (FEM) can be found. They are not comprehensive enough, and most of the FEM results are sensitive to input parameters. Micro scale behaviour, such as movement and densification of discrete particles near a pile could change the mechanism of the soil-structure interaction. A DEM model was used in this paper to study the combined loading behaviour. By explicitly considering the particulate nature of the granular sand around a model pile, the micro-mechanism governing the complex soil structure was investigated. Verification of the DEM model was carried out by comparing simulation data against a model pile. Analyses of the model pile under pure vertical, pure lateral and combined loads are presented. A discussion about the permanent accumulated pile displacements caused by the combined loads is presented, together with analyses on the sand micromechanics. They should offer insights on further research to optimise the design of mono-pile foundations to resist live loads in service.

Type: Proceedings paper
Title: A 2D DEM mono-pile model under combined loading condition
Event: International Symposium on Geomechanics from Micro and Macro (IS-Cambridge, UK, 1-3 September 2014)
Location: Univ Cambridge, Cambridge, ENGLAND
Dates: 01 September 2014 - 03 September 2014
ISBN-13: 9781138027077
Open access status: An open access version is available from UCL Discovery
DOI: 10.1201/b17395-103
Publisher version: http://dx.doi.org/10.1201/b17395-103
Language: English
Keywords: Science & technology, technology, physical sciences, engineering, geological, geosciences, multidisciplinary, engineering, geology, lateral response, vertical load.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1466180
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