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 language | English |
|---|---|
| Pages (from-to) | 360-378 |
| Number of pages | 19 |
| Journal | Marine Structures |
| Volume | 64 |
| DOIs | |
| Publication status | Published - Mar 2019 |
Cite this
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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 journal › Article
TY - JOUR
T1 - A new hysteretic seabed model for riser-soil interaction
AU - Zargar, Ehssan
AU - Kimiaei, Mehrdad
AU - Randolph, Mark
PY - 2019/3
Y1 - 2019/3
N2 - 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.
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
DO - 10.1016/j.marstruc.2018.08.002
M3 - Article
VL - 64
SP - 360
EP - 378
JO - Marine Structures
JF - Marine Structures
SN - 0951-8339
ER -