摘要
[目的]随着对清洁能源的需求进一步扩张,近年来海上风电行业的发展突飞猛进,而筒型基础凭借其经济性好、施工方便、可回收利用等优点成为海上风电基础的优选项。由于我国地震带分布广泛,海上风电基础的抗震性能是结构安全性中必须考虑的一环。筒型基础结构刚度较大,地震对结构自身产生破坏的概率较低,风电基础在地震作用下的失效主要是地基土的液化造成的。文章对砂土地基中海上风电筒型基础的抗震性能展开研究。[方法]通过振动台试验对筒型基础砂土地基的抗液化性能进行了分析,研究对象包括砂土地基中的4种筒型基础。4种筒型基础形式分别为单筒型基础、复合筒型基础、三筒型及四筒型导管架基础。[结果]试验获得了不同型式筒型基础的砂土地基超孔压比,阐明了筒型基础及其砂土地基的抗震机理。[结论]筒型基础可以通过上部结构的附加荷载效应和筒壁及分舱板的环箍效应削弱砂土的剪缩性,进而提高其抗液化能力。将单筒型基础与复合筒型基础、三筒导管架基础与四筒导管架基础的试验结果进行比较,发现复合筒型基础和四筒导管架基础在砂土地基中的抗震性能分别优于单筒型基础和三筒导管架基础。
[Introduction]With the increasing demand for clean energy,the offshore wind power sector has seen a spurt of progress in recent years,and the bucket foundation has become the preferred choice for offshore wind turbines considering its good economy,convenient construction,and recyclability.Due to the widespread distribution of seismic zones in China,the seismic performance of bucket foundation is a crucial consideration for structural design.The bucket foundation is featured by high structure stiffness,so that the probability of structure damage caused by earthquake is low,and the failure under earthquake is mainly caused by the liquefaction of the foundation soil.For this purpose,the paper focuses on the seismic performance of bucket foundation in sandy soil.[Method]The liquefaction resistance of sandy soil for bucket foundation was analyzed by shaking table tests in this paper.The study objects included four types of bucket foundation in sandy soil,namely mono-bucket foundation(MBF),composite bucket foundation(CBF),three-bucket jacket foundation(TBJF)and four-bucket jacket foundation(FBJF).[Result]By carrying out shaking table tests,the excess pore pressure ratios of sandy soil for different types of bucket foundation under earthquake are obtained,and the impact mechanism of bucket foundation on the anti-liquefaction performance of sand soil is clarified.[Conclusion]The bucket foundation can improve the liquefaction resistance of sand,since the additional load effect of the superstructure and the hoop effect of bucket skirt weakens its shear shrinkage.The test results of MBF are compared with those of CBF,and the test results of TBJF are compared with those of FBJF.It is found that the seismic performance of CBF and FBJF is respectively superior to that of MBF and TBJF.
作者
李婧宜
张浦阳
乐丛欢
丁红岩
齐晓亮
LI Jingyi;ZHANG Puyang;LE Conghuan;DING Hongyan;QI Xiaoliang(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Oil Production Service Branch of CNOOC Energy Development Co.,Ltd.,Tianjin 300452,China)
出处
《南方能源建设》
2023年第4期18-31,共14页
Southern Energy Construction
基金
国家自然科学基金“海上风电筒型基础浪溅区穿越过程运动响应及姿态控制研究”(52171274)。
关键词
筒型基础
液化
振动台试验
孔隙压力
地震响应
bucket foundation
liquefaction
shaking table test
pore pressure
seismic response
作者简介
第一作者:李婧宜,1995-,Female,PhD student,school of architecture and engineering,Tianjin University,mainly engaged in the field of offshore wind and photovoltaic infrastructure(e-mail)qixiling163@163.com;通信作者:张浦阳,1978-,Male,associate professor of Tianjin University,PhD,mainly engaged in the research of Infrastructure for offshore clean energy(e-mail)zpy_td@163.com;乐丛欢,1983-,Female,associate researcher of Tianjin University,PhD,mainly engaged in the research of Infrastructure for offshore clean energy(e-mail)leconghuan@163.com;丁红岩,1963-,Male,professor of Tianjin University,PhD,mainly engaged in the research of infrastructure for offshore clean energy(e-mail)dhy_td@163.com;齐晓亮,1981-,Male,senior engineer,college of engineering,Ocean University of China,coastal and port major,PhD,mainly engaged in floating facility design and support technology Han nationality(e-mail)1032520527@qq.com.
