【摘 要】
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Monopile is a major foundation form of offshore wind turbines and its stability is affected by wave-induced seabed liquefaction.In this paper,the influence of storm wave-induced seabed liquefaction on
【机 构】
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School of Marine Science and Technology,Tianjin University,Tianjin 300072,China;Shandong Provincial
【出 处】
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第一届国际海洋工程地质学术研讨会(ISMEG2016)(2016 International Symposium on
论文部分内容阅读
Monopile is a major foundation form of offshore wind turbines and its stability is affected by wave-induced seabed liquefaction.In this paper,the influence of storm wave-induced seabed liquefaction on the deformation of monopile wind turbine in silty seabed is investigated through the case of the Yellow River delta,in which the storm associated loads(i.e.,wind loads,wave loads and current loads)on the structure and the reduction of lateral resistances of seabed soil due to wave-induced excess pore pressure and liquefaction are considered simultaneously.First,the storm associated loads acting on the structure of a typical offshore wind turbine is determined.Next,p-y curves of saturated silt and the reduction factors under different levels of liquefaction are obtained via model tests.At last,the deformation of offshore monopile wind turbine is examined by considering storm wave-induced liquefaction of silty seabed in the Yellow River delta.Results indicate that storm wave-induced excess pore pressures,whether reach the state of liquefaction or not,can reduce the resistance of seabed soil and increase the lateral deformation at pile top.In the case of 1-year storm waves,the excess pore pressure ratio is larger than 0.2 within the depth of 5 m and the increase of lateral deformation(9%)is negligible.While in the case of 50-year storm waves,the excess pore pressure ratio is larger than 0.2 deep to 24 m,and the lateral deformation at pile top is increased by 39.9%,resulting in that additional 3~5 m inserted length of the monopile is needed to offset the effects of storm wave-induced liquefaction.
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