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

陈志波1, 2, 刘海波1, 2, 曹光伟1, 2, 何奔3, 曾旭明4, 潘生贵4

振动与冲击 ›› 2025, Vol. 44 ›› Issue (3) : 291-300.

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (3) : 291-300.
地震科学与结构抗震

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

  • 陈志波1,2,刘海波1,2,曹光伟*1,2,何奔3,曾旭明4,潘生贵4
作者信息 +

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

  • CHEN Zhibo1,2, LIU Haibo1,2, CAO Guangwei*1,2, HE Ben3, ZENG Xuming4, PAN Shenggui4
Author information +
文章历史 +

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,本文根据波动理论和斯奈尔定律,推导了基于粘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。

Abstract

In China, offshore seismic events are frequent, significantly impacting the stability of offshore wind power foundations and turbine structures. To accurately and effectively calculate the seismic dynamic response of offshore wind power structures, this study derives a formula for calculating equivalent nodal forces based on the viscoelastic artificial boundary within a three-dimensional layered soil framework, employing wave theory and Snell's Law. The accuracy of this formula is rigorously validated. Building upon this, using soil data from a wind farm site in Putian, Fujian Province, a comprehensive integrated numerical analysis model is developed. This model incorporates a 5 MW wind turbine-monopile system interacting with a layered seabed, facilitating seismic response analysis specific to offshore wind power installations. The study highlights varied responses of soil across different locations within the foundation during seismic events. Particularly, in shallow pile-soil interactions, proximity to the pile foundation correlates with reduced soil acceleration response, suggesting a restraining effect exerted by the pile foundation on soil acceleration around shallow piles. Moreover, the influence of the pile foundation on shear strain within soil layers at varying depths exhibits considerable disparity. Regarding wind turbine structures, the analysis reveals distinctive patterns: maximum displacement occurs at the tower's apex, while maximum acceleration is observed mid-tower, with peak stress concentrated in the tower's midsection.

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

Key words

viscous-elastic artificial boundary / equivalent nodal force / layered soil / monopile offshore wind turbine / seismic response 

引用本文

导出引用
陈志波1, 2, 刘海波1, 2, 曹光伟1, 2, 何奔3, 曾旭明4, 潘生贵4. 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[J]. 振动与冲击, 2025, 44(3): 291-300
CHEN Zhibo1, 2, LIU Haibo1, 2, CAO Guangwei1, 2, HE Ben3, ZENG Xuming4, PAN Shenggui4. Seismic response analysis of offshore wind turbine in layered subsoils based on viscoelastic artificial boundary[J]. Journal of Vibration and Shock, 2025, 44(3): 291-300

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