Three-dimensional modeling of wave-induced residual seabed response around a mono-pile foundation

Zhao, Hongyi; Jeng, Dong‐Sheng; Liao, Chencong; Zhu, Jianfeng

doi:10.1016/j.coastaleng.2017.07.002

Cited by 75 publications

(29 citation statements)

References 27 publications

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“…The construction process of the dumbbell cofferdam inevitably disturbs the surrounding seabed, which has completed consolidation under gravity and reaches a new equilibrium state. Therefore, it is necessary to first carry out steady-state analysis in the numerical model to take into account the initial consolidation state of the surrounding seabed under the gravitational action of the cofferdam [22,51]. Then, steady-state analysis is used as the initial condition for further analysis of the wave-induced non-homogeneous anisotropic seabed response around the cofferdam.…”

Section: Consolidation Of the Seabedmentioning

confidence: 99%

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Wave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed

Chen

Jeng

Liao

et al. 2019

JMSE

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Cofferdams are frequently used to assist in the construction of offshore structures that are built on a natural non-homogeneous anisotropic seabed. In this study, a three-dimensional (3D) integrated numerical model consisting of a wave submodel and seabed submodel was adopted to investigate the wave–structure–seabed interaction. Reynolds-Averaged Navier–Stokes (RANS) equations were employed to simulate the wave-induced fluid motion and Biot’s poroelastic theory was adopted to control the wave-induced seabed response. The present model was validated with available laboratory experimental data and previous analytical results. The hydrodynamic process and seabed response around the dumbbell cofferdam are discussed in detail, with particular attention paid to the influence of the depth functions of the permeability K i and shear modulus G j . Numerical results indicate that to avoid the misestimation of the liquefaction depth, a steady-state analysis should be carried out prior to the transient seabed response analysis to first determine the equilibrium state caused by seabed consolidation. The depth function G j markedly affects the vertical distribution of the pore pressure and the seabed liquefaction around the dumbbell cofferdam. The depth function K i has a mild effect on the vertical distribution of the pore pressure within a coarse sand seabed, with the influence concentrated in the range defined by 0.1 times the seabed thickness above and below the embedded depth. The depth function K i has little effect on seabed liquefaction. In addition, the traditional assumption that treats the seabed parameters as constants may result in the overestimation of the seabed liquefaction depth and the liquefaction area around the cofferdam will be miscalculated if consolidation is not considered. Moreover, parametric studies reveal that the shear modulus at the seabed surface G z 0 has a significant influence on the vertical distribution of the pore pressure. However, the effect of the permeability at the seabed surface K z 0 on the vertical distribution of the pore pressure is mainly concentrated on the seabed above the embedded depth in front and to the side of the cofferdam. Furthermore, the amplitude of pore pressure decreases as Poisson’s ratio μ s increases.

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Section: Consolidation Of the Seabedmentioning

confidence: 99%

“…In recent years, the wave-induced seabed response in the vicinity of offshore structures has been the focus of numerous studies [21][22][23][24][25]. In particular, the wave-induced seabed response around pile foundations [26][27][28], breakwaters [29][30][31] and pipelines [32][33][34][35][36] has attracted a lot of attention.…”

Section: Introductionmentioning

confidence: 99%

Wave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed

Chen

Jeng

Liao

et al. 2019

JMSE

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“…However, not much consideration has been given to the oscillatory wave-induced seabed response around these structures. In most recent time, the numerous investigation on 3-dimensional numerical studies on wave-induced response around pile structures has focused most of their attention around the monopile structure [15][16][17][18][19][20][21]. However, some few studies have carried out on gravity-based support structure [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…However, the interaction between the nonlinear wave and pile had a considerable impact on the porous seabed response. Zhao et al [21] extensively carried out an investigation into a 3-dimensional integrated numerical model around a monopile foundation based on the RANS equations for the wave and Biot's consolidation equation for oscillatory seabed response as well as residual seabed response formulated by Sassa et al [27]. Their results reveal that the analyses of seabed soil consolidation response in the presence of marine structure are essential for the liquefaction analysis.…”

Section: Introductionmentioning

confidence: 99%

3-Dimensional numerical study of wave-induced seabed response around three different types of wind turbine pile foundations

et al. 2019

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In this paper, preliminary study is conducted on oscillatory wave-induced seabed response around three configuration cases of pile support foundations applying a 3-dimensional integrated numerical model to study and comparatively analyzed them. In the past, numerous studies have been conducted into exploring the wave-seabed-structure interaction (WSSI) mostly around monopile. However, attention on other pile support structure foundations is minimal. In this present study, Reynolds-Average Navier-Stokes equations with k-turbulence closure as well as Biot's poroelastic theory are employed to govern the wave motion and porous seabed foundation respectively. The present numerical model is compared with available physical experimental data to determine its capability of simulating the WSSI around pile structures. Results analysis indicate that the impact of wave forces and wave pressure on the gravity-based support foundation is relatively higher than that of the monopile and tripod support pile due to the large peripheral area it occupied. Result of the momentary wave-induced liquefaction depth for the three configuration cases of pile structures at the upstream side in the seabed foundation shows that the tripod support pile has higher tendency resistance against wave-induced liquefaction, which may perhaps be due to the additional legs.

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“…However, these studies only focused on the oscillatory mechanism which are probably seen in a sandy seabed with high permeability. Recently, Zhao et al (2017) investigated the residual soil response around a pile foundation by integrating a RANS wave model and a QS seabed model. In their study, the inertial terms of soil skeleton and pore water were neglected.…”

mentioning

confidence: 99%

Dynamic Residual Seabed Response Around a Movable Pile Foundation

Sui¹,

Zhang²,

Zheng³

et al. 2018

Int. Conf. Coastal. Eng.

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Wave-induced seabed soil response and its resultant liquefaction is common observed in a silt seabed with relative poor drainage condition, which poses a great threaten to the foundation safety of marine structures. Regarding the governing equations, three different approaches namely the Fully-dynamic (FD), Partialdynamic (PD) and Quasi-static (QS) model, have been used in the previous studies. Among these, both PD and FD approaches consider the effect of the inertial terms of soil skeleton/fluid. It has been reported in the literature that effects of the inertial terms on the seabed response could not be neglected, especially for the seabed around a movable structure (Ulker et al., 2010). However, these studies only focused on the oscillatory mechanism which are probably seen in a sandy seabed with high permeability. Recently, Zhao et al. (2017) investigated the residual soil response around a pile foundation by integrating a RANS wave model and a QS seabed model. In their study, the inertial terms of soil skeleton and pore water were neglected. To the authorsâ€™ best knowledge, up to now, effects of the inertial terms on the residual response of a silt seabed have not been investigated.

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Three-dimensional modeling of wave-induced residual seabed response around a mono-pile foundation

Cited by 75 publications

References 27 publications

Wave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed

Wave-Induced Seabed Response around a Dumbbell Cofferdam in Non-Homogeneous Anisotropic Seabed

3-Dimensional numerical study of wave-induced seabed response around three different types of wind turbine pile foundations

Dynamic Residual Seabed Response Around a Movable Pile Foundation

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