Evolving Soil-Conductor Stiffness Due to Multiple-Episode Cyclic Loading

Research output: Chapter in Book/Conference paperConference paperpeer-review

Abstract

Offshore drilling operations typically involve a wellhead/casing system connected to a floating vessel, with metocean forcing on the vessel translating to lateral movement at the wellhead. The conductor is the outer-most casing and must be checked against fatigue due to repeated cycling, which can create ‘hot-spots’ of high accumulated damage. Assessing this involves soil-structure interaction analysis, in which the soil-conductor lateral behaviour is modelled as non-linear springs called p-y curves. Current industry practice often only accounts for stiffness degradation due to cyclic loading, excluding load history effects and/or potential regain in stiffness resulting from pore-pressure dissipation after cycling. This paper compares results from centrifuge testing of a rigid length of conductor installed in reconstituted samples of carbonate silt and kaolin clay, subject to sequences of cyclic lateral displacement. The main aspects studied are the effect of previous cycling (load history), the effect of consolidation between episodes of undrained loading, and the impact of one-way vs two-way loading.

Original languageEnglish
Title of host publicationProceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering - Sustainable Energy and Marine Planning
EditorsDat Vu Huynh, Anh Minh Tang, Dinh Hong Doan, Phil Watson
PublisherSpringer Science + Business Media
Pages278-285
Number of pages8
ISBN (Print)9789811677342
DOIs
Publication statusPublished - 2022
Event2nd Vietnam Symposium on Advances in Offshore Engineering, VSOE 2021 - 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, VSOE 2021
Country/TerritoryViet Nam
CityHo Chi Minh City
Period1/11/213/11/21

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