Observations during suction bucket installation in sand

Research output: Contribution to journalArticle

84 Downloads (Pure)

Abstract

Abstract
Suction buckets represent a viable solution as foundations for offshore wind turbines. Installation in sand is relatively straightforward, albeit with limited understanding of the resulting changes in soil state. This paper describes an experimental methodology that allows for visualisation and quantification of changes in soil state during suction bucket installation, validated in sand. Insights obtained from particle image velocimetry (PIV) analyses, performed on images of a half-bucket installing against a Perspex window taken in a geotechnical centrifuge are discussed. Compared with the initial self-weight penetration, the deformation mechanism governing the suction-assisted phase shows a preference for the soil below the skirt tips to move inwards and upwards inside the bucket. The installation process is responsible for changes in relative density and permeability within the bucket. In these experiments, the majority of the soil plug heave can be attributed to the soil displaced inwards by the advancing skirts, with a minor contribution caused by dilation. The confidence in the experimental methodology provided through the results of suction bucket installation in sand discussed herein now enables suction bucket installation in more complex seabeds to be investigated.
Original languageEnglish
JournalInternational Journal of Physical Modelling in Geotechnics
DOIs
Publication statusE-pub ahead of print - 21 Jan 2019

Fingerprint

suction
Sand
Soils
sand
soil
Offshore wind turbines
heave
methodology
wind turbine
deformation mechanism
dilation
Centrifuges
centrifuge
Velocity measurement
visualization
penetration
Visualization
permeability
experiment
Experiments

Cite this

@article{6d7021a5d8374044838de334bd9d7a7a,
title = "Observations during suction bucket installation in sand",
abstract = "AbstractSuction buckets represent a viable solution as foundations for offshore wind turbines. Installation in sand is relatively straightforward, albeit with limited understanding of the resulting changes in soil state. This paper describes an experimental methodology that allows for visualisation and quantification of changes in soil state during suction bucket installation, validated in sand. Insights obtained from particle image velocimetry (PIV) analyses, performed on images of a half-bucket installing against a Perspex window taken in a geotechnical centrifuge are discussed. Compared with the initial self-weight penetration, the deformation mechanism governing the suction-assisted phase shows a preference for the soil below the skirt tips to move inwards and upwards inside the bucket. The installation process is responsible for changes in relative density and permeability within the bucket. In these experiments, the majority of the soil plug heave can be attributed to the soil displaced inwards by the advancing skirts, with a minor contribution caused by dilation. The confidence in the experimental methodology provided through the results of suction bucket installation in sand discussed herein now enables suction bucket installation in more complex seabeds to be investigated.",
author = "Raffaele Ragni and Britta Bienen and Sam Stanier and Conleth O'Loughlin and Mark Cassidy",
year = "2019",
month = "1",
day = "21",
doi = "10.1680/jphmg.18.00071",
language = "English",
journal = "The International Journal of Physical Modelling in Geotechnics",
issn = "1346-213X",
publisher = "ICE Publishing Ltd.",

}

TY - JOUR

T1 - Observations during suction bucket installation in sand

AU - Ragni, Raffaele

AU - Bienen, Britta

AU - Stanier, Sam

AU - O'Loughlin, Conleth

AU - Cassidy, Mark

PY - 2019/1/21

Y1 - 2019/1/21

N2 - AbstractSuction buckets represent a viable solution as foundations for offshore wind turbines. Installation in sand is relatively straightforward, albeit with limited understanding of the resulting changes in soil state. This paper describes an experimental methodology that allows for visualisation and quantification of changes in soil state during suction bucket installation, validated in sand. Insights obtained from particle image velocimetry (PIV) analyses, performed on images of a half-bucket installing against a Perspex window taken in a geotechnical centrifuge are discussed. Compared with the initial self-weight penetration, the deformation mechanism governing the suction-assisted phase shows a preference for the soil below the skirt tips to move inwards and upwards inside the bucket. The installation process is responsible for changes in relative density and permeability within the bucket. In these experiments, the majority of the soil plug heave can be attributed to the soil displaced inwards by the advancing skirts, with a minor contribution caused by dilation. The confidence in the experimental methodology provided through the results of suction bucket installation in sand discussed herein now enables suction bucket installation in more complex seabeds to be investigated.

AB - AbstractSuction buckets represent a viable solution as foundations for offshore wind turbines. Installation in sand is relatively straightforward, albeit with limited understanding of the resulting changes in soil state. This paper describes an experimental methodology that allows for visualisation and quantification of changes in soil state during suction bucket installation, validated in sand. Insights obtained from particle image velocimetry (PIV) analyses, performed on images of a half-bucket installing against a Perspex window taken in a geotechnical centrifuge are discussed. Compared with the initial self-weight penetration, the deformation mechanism governing the suction-assisted phase shows a preference for the soil below the skirt tips to move inwards and upwards inside the bucket. The installation process is responsible for changes in relative density and permeability within the bucket. In these experiments, the majority of the soil plug heave can be attributed to the soil displaced inwards by the advancing skirts, with a minor contribution caused by dilation. The confidence in the experimental methodology provided through the results of suction bucket installation in sand discussed herein now enables suction bucket installation in more complex seabeds to be investigated.

U2 - 10.1680/jphmg.18.00071

DO - 10.1680/jphmg.18.00071

M3 - Article

JO - The International Journal of Physical Modelling in Geotechnics

JF - The International Journal of Physical Modelling in Geotechnics

SN - 1346-213X

ER -