A new hysteretic seabed model for riser-soil interaction

Research output: Contribution to journalArticle

Abstract

Several models for the simulation of soil-riser interaction have been developed and used in practice. The models range from the extreme of a rigid seabed to springs that are either linear elastic or provide more sophisticated nonlinear response to simulate the seabed behaviour in the touchdown zone. The main goal of this study is to review the positive points and limitations of existing nonlinear models and introduce a new hysteretic model to simulate the seabed response more realistically for practical application.

The new model uses a unified mathematical approach for different modes of the soil-riser interaction and incorporates an explicit degradation model for the soil behaviour. Development of a trench is simulated, together with incremental penetration of the riser into intact soil. The model can also incorporate variable parameters (e.g. depending on riser penetration rates and depth). The new model has been calibrated against existing data from model tests and found to provide good agreement for a range of test conditions.

Original languageEnglish
Pages (from-to)360-378
Number of pages19
JournalMarine Structures
Volume64
DOIs
Publication statusPublished - Mar 2019

Cite this

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title = "A new hysteretic seabed model for riser-soil interaction",
abstract = "Several models for the simulation of soil-riser interaction have been developed and used in practice. The models range from the extreme of a rigid seabed to springs that are either linear elastic or provide more sophisticated nonlinear response to simulate the seabed behaviour in the touchdown zone. The main goal of this study is to review the positive points and limitations of existing nonlinear models and introduce a new hysteretic model to simulate the seabed response more realistically for practical application.The new model uses a unified mathematical approach for different modes of the soil-riser interaction and incorporates an explicit degradation model for the soil behaviour. Development of a trench is simulated, together with incremental penetration of the riser into intact soil. The model can also incorporate variable parameters (e.g. depending on riser penetration rates and depth). The new model has been calibrated against existing data from model tests and found to provide good agreement for a range of test conditions.",
keywords = "Riser-soil interaction, Nonlinear hysteretic seabed model, Soil degradation, Trench formation, Touch down zone, STEEL CATENARY RISERS",
author = "Ehssan Zargar and Mehrdad Kimiaei and Mark Randolph",
year = "2019",
month = "3",
doi = "10.1016/j.marstruc.2018.08.002",
language = "English",
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A new hysteretic seabed model for riser-soil interaction. / Zargar, Ehssan; Kimiaei, Mehrdad; Randolph, Mark.

In: Marine Structures, Vol. 64, 03.2019, p. 360-378.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A new hysteretic seabed model for riser-soil interaction

AU - Zargar, Ehssan

AU - Kimiaei, Mehrdad

AU - Randolph, Mark

PY - 2019/3

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AB - Several models for the simulation of soil-riser interaction have been developed and used in practice. The models range from the extreme of a rigid seabed to springs that are either linear elastic or provide more sophisticated nonlinear response to simulate the seabed behaviour in the touchdown zone. The main goal of this study is to review the positive points and limitations of existing nonlinear models and introduce a new hysteretic model to simulate the seabed response more realistically for practical application.The new model uses a unified mathematical approach for different modes of the soil-riser interaction and incorporates an explicit degradation model for the soil behaviour. Development of a trench is simulated, together with incremental penetration of the riser into intact soil. The model can also incorporate variable parameters (e.g. depending on riser penetration rates and depth). The new model has been calibrated against existing data from model tests and found to provide good agreement for a range of test conditions.

KW - Riser-soil interaction

KW - Nonlinear hysteretic seabed model

KW - Soil degradation

KW - Trench formation

KW - Touch down zone

KW - STEEL CATENARY RISERS

U2 - 10.1016/j.marstruc.2018.08.002

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JO - Marine Structures

JF - Marine Structures

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