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Mechanical Characteristics of Monopile Foundation in Sand for Offshore Wind Turbine

Duan, N; (2016) Mechanical Characteristics of Monopile Foundation in Sand for Offshore Wind Turbine. Doctoral thesis , UCL (University College London). Green open access

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Abstract

The behaviour of monopile foundations for offshore wind turbines deviates from classical assumptions and accumulated experience mainly due to their large diameters and reduced slenderness. The offshore environment, which is characterised by a large number of load cycles from wind and waves, poses an additional challenge because cyclic loads may change the soil properties which in turn influence the pile’s responses to the loads. Both of these issues are still not well understood and not being properly incorporated in current design guidelines. In drained sands, the accumulating displacements can lead to foundation failure. In addition, the effects of long-term cyclic loading on the foundation’s deformation and especially on its serviceability must also be studied. The purpose of this work was to provide an insight into both aspects, by developing a reasonable numerical tool for the soil-pile interaction. In order to achieve these goals, the investigations were designed to firstly carry out a comprehensive literature review on related issues such as the p-y analysis, cyclic induced soil deformation and stiffness effects, and the simulation of soil foundation interaction by means of numerical model tests in a reduced scale using the Discrete Element Method (DEM). Several DEM models were developed in this research, including (1) a modified method of generating specimens for 2D DEM centrifuge model, (2) DEM analysis of rigid pile installation effects (3) a micromechanics study of rigid monopile under monotonic loading using DEM, (4) a discrete element method centrifuge model of rigid monopile under cyclic lateral loads, (5) a 2D DEM rigid monopile model under combined loading condition (appendix).

Type: Thesis (Doctoral)
Title: Mechanical Characteristics of Monopile Foundation in Sand for Offshore Wind Turbine
Event: University College London
Open access status: An open access version is available from UCL Discovery
Language: English
Keywords: Monopile, DEM, Micromechanics, Offshore wind turbine, Cyclic load, Sand
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
URI: http://discovery.ucl.ac.uk/id/eprint/1529635
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