Investigation of nonlinear wave-induced seabed response around mono-pile foundation

Lin, Zhifang; Pokrajac, Dubravka; Guo, Yakun; Jeng, Dong‐Sheng; Tang, Tian; Rey, Nick; Zheng, Jinhai; Zhang, Jisheng

doi:10.1016/j.coastaleng.2017.01.002

Cited by 99 publications

(51 citation statements)

References 50 publications

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“…An alternative hybrid foundation system comprising a monopile and a bearing plate (or skirted footing) has been demonstrated to enhance the lateral bearing capacity compared with a monopile [96][97][98][99]. Nevertheless, the enhanced capacity of the hybrid foundation largely relies on the proper interaction between the bearing plate and the soils at the shallow zone of the seabed, where local scour and wave-induced pore pressure could occur [100][101][102][103][104][105][106][107][108]. The extent of local scour and scour effects on both the bearing capacity and natural frequency of a hybrid monopile need to be further investigated.…”

Section: Discussionmentioning

confidence: 99%

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

Qi¹,

Gao²

2020

Geotechnical Engineering - Advances in Soil Mechanics and Foundation Engineering

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Monopile is the most commonly used foundation type for offshore wind turbines. The local scour at a monopile foundation generated by the incoming shear flow has significant influence on both quasi-static lateral responses and dynamic responses of the monopile. This chapter focuses particularly on characterizing the local scour in both spatial and temporal scales and revealing the scour mechanisms associated with the flow field around a monopile. The predicting methods for the equilibrium scour depth and the time scale of scour are detailed under various representative flow conditions in the marine environment. The scale effect while extrapolating the results of model tests to prototype conditions is highlighted. The local scour imposes significant influence not only on the deformation and stiffness of the monopile foundation, but also on the natural frequency and fatigue life of the structure system. Monopiles with diameters up to 10 m have become a feasible option as the industry is currently advancing into deeper waters. More meticulous considerations for monopile design associated with the scour depth prediction and evaluation of scour effects are still in need to efficiently minimize the cost while remaining safety simultaneously.

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Section: Discussionmentioning

confidence: 99%

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

Qi¹,

Gao²

2020

Geotechnical Engineering - Advances in Soil Mechanics and Foundation Engineering

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“…The wave sub-model is based on the FDM solved equation in Flow 3D framework, while the COMSOL Multiphysics [28] software was used to establish the seabed sub-model, which the FEM solved-equation is assigned as the governing equation. Numerous studies in the past have employed these set of equations in the investigation of the WSSI around offshore pipelines [29,30] breakwater structures [31,32] and offshore pile structures [20,21].…”

Section: Theoretical Modelmentioning

confidence: 99%

“…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%

“…In which their study investigated a 3-dimensional one-way coupled model for the WSSI around the submerged breakwater. Lin et al [20], employed the integrated FVM which integrates both the wave model and Biot's poro-elastic model to examine the oscillatory wave-induced seabed in the vicinity of the monopile foundation. However, the monopile foundation was understood to be inelastic and its response was not determined.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Field observations of some project cases have shown that wave loads do not usually cause direct damage to the strength or stiffness of an offshore structure but they often lead to the seabed liquefaction of the region that surrounds the offshore structure and subsequently result in the partial or total loss of bearing capacity [5][6][7][8]. Pile foundations, pipelines and breakwaters have received great attention in the study of wave-seabed-structure interactions [9][10][11], whereas cofferdams have been neglected in such investigations. Therefore, the study of the wave-induced seabed response around cofferdams is of great significance to the safety control during civil engineering construction.…”

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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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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Investigation of nonlinear wave-induced seabed response around mono-pile foundation

Cited by 99 publications

References 50 publications

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

Local Scour around a Monopile Foundation for Offshore Wind Turbines and Scour Effects on Structural Responses

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

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

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