砂土中海上风机三桶基础地震动力响应分析  

Seismic Dynamic Response Analysis of Tripod Suction Bucket Foundation for Offshore Wind Turbine in Sands

作　　者：李扬[1,2] 周亚东 程星磊 LI Yang;ZHOU Yadong;CHENG Xinglei(Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment,TCU,Tianjin 300384,China;School of Civil Engineering,TCU,Tianjin 300384,China)

机构地区：[1]天津城建大学天津市软土特性与工程环境重点实验室,天津300384 [2]天津城建大学土木工程学院,天津300384

出　　处：《天津城建大学学报》2025年第1期21-26,31,共7页Journal of Tianjin Chengjian University

摘　　要：通过有限差分软件FLAC 3D建立砂土中海上风机三桶基础三维数值模型,采用SANISAND本构模型模拟砂土应力应变响应,设置自由场边界条件,开展海上风机三桶基础地震响应数值分析,探究了三桶基础周围土体孔隙水压力变化规律,分析了三桶基础的水平、竖向、转角位移变化规律,揭示了三桶基础的破坏机理.研究结果表明:三桶基础可以提高砂土的抗液化能力,但“单桶”和“双桶”附近的砂土液化程度并不相同.“双桶”一侧砂土液化更加严重,其承载能力的降低也更为显著,这使得“单桶”的竖向位移远小于“双桶”,进而导致三桶基础整体向“双桶”一侧发生旋转,“单桶”和“双桶”由于土体液化产生的逐渐增加的竖向位移差是三桶基础旋转的根本原因.The three-dimensional numerical model of the tripod suction bucket foundation for OWT in sands was established by the finite difference software—FLAC 3D.The SANISAND constitutive model was used to simulate the stress-strain response of sands,to set the free-field boundary conditions,and to carry out numerical analysis of tripod suction bucket foundation for an offshore wind turbine.This paper also explored the pore water pressure change rule of the sands around the tripod suction bucket foundation,analyzed the horizontal,vertical,angular displacement change rule of the tripod suction bucket foundation,and revealed the damage mechanism of the tripod suction bucket foundation.The research results show that the tripod suction bucket foundation can improve the liquefaction resistance of sands,but the liquefaction degree of sands near the‘single bucket’and‘double bucket’is different.The liquefaction of sands on the side of‘double bucket’is more serious,and the reduction of its bearing capacity is more significant,which makes the vertical displacement of‘single bucket’much smaller than that of‘double bucket’,and leads to the rotation of the tripod suction bucket foundation as a whole to the side of the‘double bucket’.The gradual increase of the vertical displacement difference between‘single bucket’and‘double bucket’due to the liquefaction of sands is the root cause of the rotation of the tripod suction bucket foundation.

关 键 词：吸力桶 砂土 地震荷载 液化 

分 类 号：TU473.1[建筑科学—结构工程]