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Liquefaction analysis of soil plugs within large diameter monopiles using numerical modelling

Published version
Peer-reviewed

Repository DOI


Type

Article

Change log

Authors

Español-Espinel, Carlos  ORCID logo  https://orcid.org/0000-0002-1582-3742
Madabhushi, Gopal SP  ORCID logo  https://orcid.org/0000-0003-4031-8761

Abstract

jats:titleAbstract</jats:title>jats:pSoil plug formation in open-ended piles due to pile driving is a widely studied phenomenon in onshore applications. The narrow diameters of traditional onshore piles ranging from 0.5 to 1.5 m facilitate plug generation during installation and transfer of enhanced confining stresses across the whole body of the soil plug. Offshore wind monopiles with larger diameters and smaller aspect ratios may not enhance confining stress within the soil plug as effectively as their onshore counterparts. Monopiles are currently the most widespread foundation in the offshore wind sector including in seismic areas. Earthquake shaking can lead to accumulation of excess pore pressure and subsequent liquefaction of the soil retained inside the plug. This research investigates the influence of monopile diameter and confining stress on the development of earthquake-induced excess pore pressure within the soil plug using fully coupled time domain Finite Element Analysis. The results presented in this paper reveal lower accumulation of earthquake-induced excess pore pressure in soil plugs subjected to confining stress. However, the influence of additional horizontal stress caused by monopile driving on the generation of excess pore pressure within the soil plug diminishes as the monopile diameter is progressively increased.</jats:p>

Description

Keywords

Soil plug, Monopiles, Earthquakes, Liquefaction, Confining stress

Journal Title

Bulletin of Earthquake Engineering

Conference Name

Journal ISSN

1570-761X
1573-1456

Volume Title

Publisher

Springer
Sponsorship
EPSRC (2481978)