随机循环载荷作用下吸力筒基础的承载特性分析  

Analysis for Bearing Behaviors of Suction Caisson under Random Cyclic Loads

作　　者：牛海峰 李向辉 梁峰 胡存 李亚 黄维 Niu Haifeng;Li Xianghui;Liang Feng;Hu Cun;Li Ya;Huang Wei(CGN New Energy Holdings Co.,Ltd.,Beijing 100070,China;Research Institute of Tsinghua University in Shenzhen,Shenzhen Guangdong 518071,China;Shenzhen Prime offshore Technology Co.,Ltd.,Shenzhen Guangdong 518067,China;School of Civil Engineering,Sun Yat-Sen University,Zhuhai Guangdong 519082,China)

机构地区：[1]中国广核新能源控股有限公司,北京100070 [2]深圳清华大学研究院,广东深圳518071 [3]深圳普罗海洋科技有限公司,广东深圳518067 [4]中山大学土木工程学院,广东珠海519082

出　　处：《港口航道与近海工程》2023年第5期31-36,46,共7页Port,Waterway and Offshore Engineering

基　　金：广东省重大人才工程项目(2021ZT09H390);深圳市高层次人才团队项目(KQTD20200820113011026);深圳市国际合作研究项目(GJHZ20220913142612023);南山区高层次创新人才团队支持计划(LHTD2021000X);广东省自然科学基金项目(2021A1515011734)。

摘　　要：作为海洋风电基础,吸力筒在我国海洋地质环境具有广泛的应用前景。因需嵌入海洋土中以提供上部风机稳定性能,故而其将受到由波浪、流等导致的随机循环载荷作用。然而国际范围内,尚未有被广泛接受的循环载荷下吸力筒承载的分析方法。鉴于此,本文基于损伤理论,采用雨流计数法,将随机循环载荷转换成系列规则的循环载荷,并结合UDCAM-s模型,以及应变累积和循环等效周次的概念,以考虑循环载荷对软黏土的累积循环软化效应,建立了一种能考虑随机循环载荷作用的吸力筒承载特性分析模型。进一步开展分析,对比了极限工况下考虑循环载荷与否的吸力筒承载力变化;量化了正常工作下吸力筒的累积变形和转角,为吸力筒的工程实际提供了设计思路。As an offshore wind turbine foundation,suction caisson has a very promising future in China ocean geological environment.The foundation is embedded in seabed soil to keep the super-structure stable under the random cyclic loads caused by winds,waves and currents etc.However,none of methods can be widely accepted to analyze the bearing capacity of suction caisson under cyclic loads in the world.In the case,rain-flow method is adopted to count the random cyclic loads as a series of regular cyclic loads based on damage theory.By combining UDCAM-s model with the strain accumulation under equivalent cyclic loading numbers,taking into account the accumulated cyclic softening effect of soft clay under cyclic loads,a new approach is established to evaluate the bearing performances of the suction caisson under random cyclic loads.By studying the difference in the bearing capacities of suction caisson under the ultimate working conditions combined with the cyclic loads or not,realizing the quantification of the accumulated deflection and rotation of the caisson,a new design idea is created for the engineering practice of the caisson.

关 键 词：吸力筒 循环载荷 承载特性 应变累积 UDCAM-s模型 循环退化 

分 类 号：U65[交通运输工程—港口、海岸及近海工程]