Wave-induced liquefaction and instability of offshore monopile in a drum centrifuge

Miyamoto, Junji; Sassa, Shinji; Tsurugasaki, Kazuhiro; Sumida, Hiroko

doi:10.1016/j.sandf.2020.10.005

Cited by 14 publications

(4 citation statements)

References 31 publications

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“…The predicted results of the models developed by and were comprehensively validated by the relevant centrifuge wave tests (Sassa and Sekiguchi, 1999). Using the same facilities as Sassa and Sekiguchi (1999), the marine structures of pipelines (Miyamoto et al, 2020) or pile foundations (Miyamoto et al, 2021) were further considered in their recent investigations. Because of the significantly increasing stress levels of soil, experimental observations in a centrifuge flume can be theoretically treated as an individual prototype in a real marine environment.…”

Section: Introductionmentioning

confidence: 99%

Wave-induced residual response and liquefaction of a nonhomogeneous layered seabed

Sui,

Yang,

Peng

et al. 2024

Front. Mar. Sci.

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Numerical studies were conducted on the wave-induced residual liquefaction of a silt–coarse sand layered seabed. Fully dynamic soil equations and residual seabed response equations were incorporated into the development of a numerical model. The numerical results were compared with theoretical solutions and experimental data from previous studies. Relatively good agreement was found in this comparison, validating the reliability of the proposed numerical model. The present model was applied to systematically investigate the wave-induced residual response with a silt–coarse sand layered seabed. The effects of coverage thickness, permeability, Young’s modulus in the upper silt layer on the residual response of the seabed were carefully examined. Numerical simulations indicate that the potential liquefaction is prone to occur with low permeability of the upper silt layer and shallower water depth, and the effect of coverage thickness of the silt layer on pore pressure and liquefaction potential is determined by shear stress ratio (χ) and effective normalized spreading parameter (Se) which represent the “generation power” and “dissipation potential” for residual pore pressure. The performance of the pore pressure and liquefaction in the layered seabed is the result of a trade-off between two non-dimensional parameters.

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Section: Introductionmentioning

confidence: 99%

Wave-induced residual response and liquefaction of a nonhomogeneous layered seabed

Sui,

Yang,

Peng

et al. 2024

Front. Mar. Sci.

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“…Most of the previous research has been exclusively related to either the inertial interaction of ground founded OWTs or the kinematic seismic response of foundations 2,21,22 ; previous studies have mostly focused on how the eccentric the rotor‐nacelle‐assembly (RNA) is to the tower top and how the rotary inertia due to blades can influence the structural response of the wind turbines, or they have focused on the forces induced on the piles connected to rigid pile caps following ground motion. A few studies have considered the soil‐structure interaction problems of grounded OWT systems in liquefiable soils, but many issues are still uncertain 23,24 ; Haddad et al 25–30 …”

Section: Introductionmentioning

confidence: 99%

“…3 of the wind turbines, or they have focused on the forces induced on the piles connected to rigid pile caps following ground motion. A few studies have considered the soil-structure interaction problems of grounded OWT systems in liquefiable soils, but many issues are still uncertain 23,24 ; Haddad et al [25][26][27][28][29][30] In this study, a comprehensive series of nonlinear dynamic finite element (FE) effective stress analyses modeling the skirted circular foundations supporting OWTs with varied embedment ratios subjected to 20 outcropping rock motions were carried out.…”

Section: Introductionmentioning

confidence: 99%

A simplified procedure for the prediction of liquefaction‐induced settlement of offshore wind turbines supported by suction caisson foundation based on effective stress analyses and an ML‐based group method of data handling

Farahani,

Barari

2023

Earthq Engng Struct Dyn

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In this research, a series of non‐linear dynamic finite element (FE) effective stress analyses were conducted to analyze the influence of the suction caisson geometry, ground motion intensity and contact pressure caused by the offshore wind turbine (OWT) on the settlement pattern and seismic demand of the OWT's structure on saturated dense sand. The baseline model and the FE procedure were validated using a database of well‐documented centrifuge tests. However, particular attention was given to the calibration campaign based on the measured system response quantities, such as the settlement, acceleration and pore‐pressure time histories. The FE results identified the contact pressure as an important state parameter caused by the OWT's mass; the governing ground‐shaking intensity measures that play a significant role in the derivation of an analytical framework for predicting liquefaction‐induced OWT settlements during major events are the shaking intensity rate (SIR), Arias Intensity ( and spectral acceleration at a period equal to 1 s (T = 1 s). The results revealed that approximating expressions derived using the modified least‐squares method (MLSM) reasonably capture the complex phenomenon of liquefaction‐induced settlement, with some exceptions at lower SIR values. Finally, to obtain the approximating expressions, the database was combined with a machine learning (ML)‐based group method of data handling (GMDH) that appropriately describes the interplay of multiple properties of the foundation soil, structure and seismic events while incorporating the effect of the interaction between the suction caisson, foundation soil, excess pore‐pressure generation and cyclic shear stresses.

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“…In a seismically active area, the damage to the monopile-supported OWT can increase under the combined effects of scour and earthquakes, in particular for fully liquefied soils that experience a drastic loss of soil strength by earthquakes, thus reducing the pile capacity (Esfeh and Kaynia, 2020;Jia et al, 2017;Miyamoto et al, 2021;Yang et al, 2019a). Moreover, the scour hole at a monopile caused by currents or waves can also be varied by the state of soil liquefaction.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of vertical effective stress and pile tension capacity in sands considering scour-hole dimensions

Lin

Jiang

2019

Computers and Geotechnics

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Wave-induced liquefaction and instability of offshore monopile in a drum centrifuge

Cited by 14 publications

References 31 publications

Wave-induced residual response and liquefaction of a nonhomogeneous layered seabed

Wave-induced residual response and liquefaction of a nonhomogeneous layered seabed

A simplified procedure for the prediction of liquefaction‐induced settlement of offshore wind turbines supported by suction caisson foundation based on effective stress analyses and an ML‐based group method of data handling

Evaluation of vertical effective stress and pile tension capacity in sands considering scour-hole dimensions

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