防灾减灾工程学报2026，Vol.46Issue(2)：430-440,11.DOI:10.13409/j.cnki.jdpme.20240823002
冲刷环境下四桩导管架基础长期循环承载变形特性试验研究
Experimental Study on Bearing and Deformation Characteristics of Four-pile Jacket Foundations under Long-term Cyclic Loading in Scour Environment
摘要
Abstract
With the rapid expansion of offshore wind farms into deeper waters and the concurrent in-crease in wind turbine capacities,the application of four-pile jacket foundations in offshore wind tur-bines has become increasingly widespread.Ensuring the service safety of these foundations in complex marine environments has become one of the critical problems urgently to be solved in China′s wind power sector.Focusing on the four-pile jacket foundation-wind turbine structural system in sand,considering the combined effects of local scour and cyclic loading caused by wind,waves,and cur-rents,a series of long-term combined horizontal wind-wave cyclic loading model tests in local scour environment were designed and conducted.The cumulative inclination angle and natural frequency of the structural system were analyzed under different cyclic loading amplitudes,revealing the evolution patterns of displacement at the jacket foundation top with the increasing number of cycles.Further-more,the evolution process of the bending moments and pile deformation curves of both front and rear piles of the jacket with the increasing number of cycles was plotted.The influence of factors such as scour depth on the bearing and deformation characteristics of offshore wind turbines with four-pile jack-et foundations under long-term cyclic loading was examined,and a simplified prediction formula was developed to estimate the cumulative displacement of offshore wind turbines with four-pile jacket foun-dations under scour conditions for engineering design practice.The results demonstrated that the scour significantly increased the cumulative displacement of four-pile jacket foundations under cyclic load-ing,with final deformation reaching up to 2.8 times compared with that observed in unscoured condi-tions,thereby hindering effective control of the cumulative inclination angle of the entire wind turbine structural system.The long-term combined effects of scour and cyclic loading weakened the jacket foundation-soil interaction stiffness and altered the dynamic characteristics,consequently reducing the natural frequency of the wind turbine system.At a scour depth equal to three times the pile diameter,the reduction in frequency reached 10%to 14%.Additionally,ongoing cyclic loading gradually in-creased internal forces and deformation of the jacket piles,with the maximum bending moment point moving downward,a trend significantly intensified by scour.These findings offer critical insights into the design and safety assessment of offshore wind turbines in scour-prone environments.关键词
海上风机/四桩导管架基础/局部冲刷/长期循环加载/累积变形Key words
offshore wind turbine/four-pile jacket foundations/local scour/long-term cyclic loading/cumulative deformation分类
建筑与水利引用本文复制引用
丁志杰,张浩,杨爱武,郑瀚波,李林,沈盼盼..冲刷环境下四桩导管架基础长期循环承载变形特性试验研究[J].防灾减灾工程学报,2026,46(2):430-440,11.基金项目
国家自然科学基金项目(52008246)、中央高校基本科研业务费专项资金(2232024D-19)、上海勘测设计研究院有限公司上海海上风能资源开发利用工程技术研究中心开放课题(FNZX2023KP05)资助 （52008246）
