Shaking Table Tests and Seismic Response of Three-Bucket Jacket Foundations for Offshore Wind Turbines  

作　　者：DING Hongyan PAN Chen ZHANG Puyang WANG Le XU Yunlong 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin,300072,China [2]Key Laboratory of Coast Civil Structure Safety,Ministry of Education,Tianjin University,Tianjin,300072,China [3]School of Civil Engineering,Tianjin University,Tianjin,300072,China

出　　处：《Journal of Ocean University of China》2022年第3期719-736,共18页中国海洋大学学报（英文版）

基　　金：the National Natural Science Foundation of China(No.52171274)。

摘　　要：The seismic response characteristics of three-bucket jacket foundations for offshore wind turbines(OWTs)and the liquefaction of the surrounding soil are particularly important for the development and application of this type of structure for offshore use.Using the shaking table test and three-dimensional finite element analysis,different magnitudes of simulated earthquake waves were used as inputs to the shaking table to model seismic excitations.The resulting changes in the excess pore water pressure and acceleration response of the soil under horizontal earthquake are compared in this paper.Calculations of the anti-liquefaction shear stress and equivalent shearing stress during the earthquake,determination of the areas prone to liquefaction,and identification of the effect of the three-bucket jacket foundation on the soil liquefaction resistance were conducted by developing a soil-structure finite element model.The development law of the soil’s amplification effect on seismic acceleration and the seismic response of the foundation soil under various magnitude earthquake waves were also discussed.Results indicate that liquefying the soil inside the bucket of the foundation is more difficult than that outside the bucket during the excitation of seismic waves due to the large upper load and the restraint of the surrounding hoop.This finding confirms the advantages of the three-bucket jacket foundations in improving the liquefaction resistance of the soil inside the bucket.However,the confinement has a barely noticeable impact on the nearby soil outside the skirt.The phenomenon of soil liquefaction at the bottom of the skirt occurred earlier than that in other positions during the seismic excitation,and the excess pore water pressure slowly dissipated.The acceleration amplification coefficient of the sand outside the bucket increases with depth,but that of the sand inside the bucket is substantially inhibited in the height range of the bucket foundation.This result proves the inhibition effects of the three-bucke

关 键 词：three-bucket jacket foundation seismic response shaking table test liquefaction analysis 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] P75[天文地球—海洋科学]