Evolution of riser-soil stiffness in a soil crust layer

Research output: Chapter in Book/Conference paperConference paper

2 Citations (Scopus)

Abstract

Site investigation data have shown that a crust layer may occur at the surface of many seabeds, with the crust exhibiting undrained strengths up to an order of magnitude higher than that of underlying normally consolidated sediments. This may affect the fatigue life assessment of steel catenary riser (SCR) as a result of riser-soil interaction. The paper presents data from centrifuge model tests, investigating the changes in riser-soil stiffness during cyclic motion of a rigid model pipe (simulating a riser element) within a model crust layer. The paper reports data from a cyclic test with 2000 cycles at a cyclic amplitude of 0.01D. The soil stiffness decreased initially for the first 300 cycles, but increased thereafter, indicating the importance of quantifying the long-term stiffness changes in this type of soil layer. The results are discussed in relation to current guidelines for estimating suitable values of seabed stiffness for SCR fatigue design.

Original languageEnglish
Title of host publicationProceedings of the 1st Vietnam Symposium on Advances in Offshore Engineering
Subtitle of host publicationEnergy and Geotechnics
Place of PublicationSingapore
PublisherSpringer
Pages130-136
Number of pages7
ISBN (Electronic)9789811323065
ISBN (Print)9789811323058
DOIs
Publication statusE-pub ahead of print - 25 Sep 2019
Event1st Vietnam Symposium on Advances in Offshore Engineering 2018 - Hanoi, Viet Nam
Duration: 1 Nov 20183 Nov 2018

Publication series

NameLecture Notes in Civil Engineering
Volume18
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

Conference1st Vietnam Symposium on Advances in Offshore Engineering 2018
Abbreviated titleVSOE 2018
CountryViet Nam
CityHanoi
Period1/11/183/11/18

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