Wave induced instantaneously-liquefied soil depth in a non-cohesive seabed

Qi, Wen-Gang; Gao, Fu‐Ping

doi:10.1016/j.oceaneng.2018.01.107

Cited by 46 publications

(22 citation statements)

References 30 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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“…This (u/σ' v0 >1) occurs because of the use of the elastic model, and cannot be rigorously avoided as there is no yielding criteria. In fact, the maximum liquefaction depth predicted with elastic model may be larger than that with a plastic model, due to the fact that the pore pressure is difficult to release with the elastic model (Qi and Gao, 2018). Such conservative approach benefits the foundation design in engineering practice.…”

Section: Residual Liquefactionmentioning

confidence: 99%

Wave-induced seabed residual response and liquefaction around a mono-pile foundation with various embedded depth

et al. 2019

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“…where P osc is the oscillatory pore-pressure corresponding to the elastic deformation of the soil skeleton. P osc fluctuates in both temporal and spatial domains, and the fluctuation is accompanied by the attenuation of the amplitude and phase lag under wave actions [13][14][15]. P res is the residual pore-pressure that is period-averaged, and is the result of accumulated plastic deformation of the soil skeleton.…”

Section: Analytical Solution For Wave-induced Pore-pressure Accumulationmentioning

confidence: 99%

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

Guo

Zhou

Zhu

et al. 2019

JMSE

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Silty sand is a kind of typical marine sediment that is widely distributed in the offshore areas of East China. It has been found that under continuous actions of wave pressure, a mass of fine particles will gradually rise up to the surface of silty sand seabeds, i.e., the phenomenon called wave-induced soil erosion. This is thought to be due to the seepage flow caused by the pore-pressure accumulation within the seabed. In this paper, a kind of three-phase soil model (soil skeleton, pore fluid, and fluidized soil particles) is established to simulate the process of wave-induced soil erosion. In the simulations, the analytical solution for wave-induced pore-pressure accumulation was used, and Darcy flow law, mass conservation, and generation equations were coupled. Then, the time characteristics of wave-induced soil erosion in the seabed were studied, especially for the effects of wave height, wave period, and critical concentration of fluidized particles. It can be concluded that the most significant soil erosion under wave actions appears at the shallow seabed. With the increases of wave height and critical concentration of fluidized particles, the soil erosion rate and erosion degree increase obviously, and there exists a particular wave period that will lead to the most severe and the fastest rate of soil erosion in the seabed.

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Wave induced instantaneously-liquefied soil depth in a non-cohesive seabed

Cited by 46 publications

References 30 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

Wave-induced seabed residual response and liquefaction around a mono-pile foundation with various embedded depth

Numerical Simulations of Wave-Induced Soil Erosion in Silty Sand Seabeds

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