Installation Effects on Axial Performance of Monopiles in Chalk for Offshore Renewables

Matteo O. Ciantia (Lead / Corresponding author)

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Chalk is present in a large area of the East and South coast of the UK where renewables are now being installed. In most cases they are founded on displacement piles, whose design uses empirical methods or partial (wished-in-place) simulations. Installation effects such as grain crushing and pore pressure generation are conservatively estimated (if considered at all), as the change of chalk properties around the pile due to pile installation cannot be easily quantified. In this paper it is shown how advanced numerical modelling can be used to guide the design of the foundations in these complex soils. The coupled hydromechanical effects developing during pile installation in chalk are investigated numerically using a robust and mesh-independent implementation of an elastoplastic constitutive model at large strains. The model, implemented into an open source Particle Finite Element (PFEM) code, is able to capture the damage of the rock until the formation of a chalk putty layer around the shaft of a small diameter pile. Installation effects are highlighted by comparing the axial performance between wished in place piles and piles which considered the full installation process. The numerical results are then used to critically address the limitation of current design specifications of displacement piles in chalk.
Original languageEnglish
Title of host publicationProceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering
Subtitle of host publicationSustainable Energy and Marine Planning
EditorsDat Vu Khoa Huynh, Anh Minh Tang, Dinh Hong Doan, Phil Watson
PublisherSpringer
Pages424-432
Number of pages9
ISBN (Electronic)9789811677359
ISBN (Print)9789811677342 (hbk), 9789811677373 (pbk)
DOIs
Publication statusPublished - 2022
Event2nd Vietnam Symposium on Advances in Offshore Engineering - Ho Chi Minh City, Viet Nam
Duration: 1 Nov 20213 Nov 2021

Publication series

NameLecture Notes in Civil Engineering
Volume208
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

Conference2nd Vietnam Symposium on Advances in Offshore Engineering
Country/TerritoryViet Nam
CityHo Chi Minh City
Period1/11/213/11/21

Keywords

  • Numerical modelling
  • Chalk
  • Monopiles
  • Installation effects
  • Offshore wind
  • PFEM
  • Hydro-mechanical coupling

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