基于黏弹性人工边界的成层地基中海上风机地震响应分析  

Seismic response analysis of offshore wind turbine in layered subsoils based on viscoelastic artificial boundary

作　　者：陈志波[1,2] 刘海波 曹光伟 何奔 曾旭明 潘生贵 CHEN Zhibo;LIU Haibo;CAO Guangwei;HE Ben;ZENG Xuming;PAN Shenggui(Zijin School of Geology and Mining,Fuzhou University,Fuzhou 350116,China;Fujian-Taiwan Science and Technology Cooperation Base of Fujian Province on Intelligent Geo-environmental Engineering,Fuzhou 350116,China;Huadong Engineering Corporation Limited,Hangzhou 311122,China;Huadong Engineering(Fujian)Corporation Limited,Fuzhou 350003,China)

机构地区：[1]福州大学紫金地质与矿业学院,福州350116 [2]智能环境岩土工程福建省闽台科技合作基地,福州350116 [3]华东勘测设计院有限公司,杭州311122 [4]华东勘测设计院(福建)有限公司,福州350003

出　　处：《振动与冲击》2025年第3期291-300,308,共11页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(52278335);华东勘测设计院(福建)有限公司科技项目(FH2019-KY006);福建省自然科学基金项目(2024J08145)。

摘　　要：我国近海地震频发,地震作用对海上风电基础与风机结构的稳定性影响大。为了准确有效地计算海上风电结构地震动力响应,该文根据波动理论和斯奈尔定律,推导了基于黏弹性人工边界的三维成层土地震等效节点力计算公式,并验证了其准确性。在此基础上,以福建莆田某风电场地基为例,建立5 MW风机-单桩-成层海床三维一体化数值分析模型,进行了地震作用下的海上风电动力响应分析。研究表明:当地震发生时,地基中不同位置的土体响应不同,对于浅层桩周土体,距离桩基越近,土体加速度响应越小,桩基会对浅层桩周土体的加速度有一定抑制作用;桩基对不同深度的土层剪应变影响也相差较大。对于风机结构而言,最大位移发生在塔架顶部,最大加速度和最大应力发生在塔架中部。Earthquakes occur frequently in China’s offshore areas,and seismic actions significantly affect the stability of offshore wind power foundations and wind turbine structures.Here,to correctly and effectively calculate seismic dynamic responses of offshore wind power structures,a viscoelastic artificial boundary-based 3D layered soil seismic equivalent node force calculation formula was derived according to wave theory and Snell law,and its correctness was verified.Then,taking the foundation of a certain wind power field in Putian,Fujian Province as an example,a 3D integrated numerical analysis model for 5 MW wind turbine-single pile-layered seabed was established to analyze dynamic response of offshore wind power under earthquake.The study showed that when earthquake occurs,responses of soil bodies at different positions in foundation are different,for shallow soil body around pile,the closer the distance to pile foundation,the smaller the soil body acceleration response,pile foundation can have a certain suppressing effect on acceleration of shallow layer soil body around piles;effects of pile foundation on shear strain of soil layers at different depths also have larger differences;for wind turbine structure,the maximum displacement occurs at tower top,while the maximum acceleration and the maximum stress occur in middle of tower.

关 键 词：黏弹性人工边界 等效节点力 成层地基 单桩式海上风电 地震响应 

分 类 号：TU47[建筑科学—结构工程]