工程科学学报.第43卷.第5期：710-719.2021年5月 Chinese Journal of Engineering,Vol.43,No.5:710-719,May 2021 https://doi.org/10.13374/j.issn2095-9389.2020.03.19.004;http://cje.ustb.edu.cn 非均质土中海上风电单桩基础动力响应特性 孔德森2)区，刘一2)，邓美旭，李亚洲2 1)山东科技大学山东省土木工程防灾减灾重点实验室，青岛2665902)山东科技大学大学土木工程与建筑学院，青岛2665903)中铁建 工集团山东有限公司.青岛266100 ☒通信作者.E-mail:skd992012@sdust..edu.cn 摘要采用有限元分析软件ABAQUS建立了非均质土中海上风电单桩基础数值计算模型，将桩基础受到的波浪、洋流及 风荷载等效成双向对称循环荷载，对水平循环荷载作用下桩身水平位移、桩身剪力、桩身弯矩和桩侧土抗力进行了研究，并 对不同循环次数下桩身水平位移进行了对比分析.研究表明，桩身水平位移随时间变化逐渐累积，随着循环次数的增加.泥 面处桩身最大位移发生的时间点滞后：桩身剪力出现负值：桩身弯矩最大值发生在浅层土体：桩身外壁土抗力曲线随时间的 变化在埋深约23处出现分界点，分界点上下范围内土抗力变化规律正好相反，在淤泥土和粉砂土分界面处增加显著：不同 时间点桩身内壁沿埋深承担的荷载基本不变 关键词非均质土：海上风电：单桩基础：动力响应：水平循环荷载 分类号TU473.1 Dynamic response characteristics of an offshore,wind-power monopile foundation in heterogeneous soil KONG De-sen LIU YP),DENG Mei-xu),LI Ya-zhou) 1)Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590, China 2)College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China 3)China Railway Construction Group Shandong Co.Ltd.,Qingdao 266100,China Corresponding author,E-mail:skd992012@sdust.edu.cn ABSTRACT Wind energy is a new kind of inexhaustible energy.It is gradually replacing the traditional energy as its pollution-free and renewable.China has a long coastline,abundant offshore resources,and vast offshore space.Offshore wind farms have gradually become the focus of wind-power development.Large-diameter single-pile foundations are being widely used in the field of offshore power generation because of advantages including convenient manufacture and installation,clearer stress conditions compared with pile groups,and affordable cost and economy.Therefore,it becomes significantly relevant to study the dynamic response characteristics of large-diameter single-pile foundations under horizontal cyclic loads to eliminate the dangers hidden in engineering and installation and ensure normal usage during service.A numerical calculation model of an offshore,wind-power monopile foundation in heterogeneous soil was established by the finite element analysis software ABAQUS.The wave,ocean current,and wind load on the monopile foundation were equivalent to a bidirectional symmetrical cyclic load.The horizontal displacement,shear force,and bending moment along the pile shaft,and pile-side soil resistance under the horizontal cyclic load were studied.Furthermore,the horizontal displacements along the pile shaft under different cyclic times were compared with one another and analyzed.The results show that the horizontal 收稿日期：2020-03-19 基金项目：山东省自然科学基金资助项目(ZR2019MEE027):国家自然科学基金资助项目(41372288)非均质土中海上风电单桩基础动力响应特性 孔德森1,2) 苣，刘    一2,3)，邓美旭2)，李亚洲2) 1) 山东科技大学山东省土木工程防灾减灾重点实验室，青岛 266590    2) 山东科技大学大学土木工程与建筑学院，青岛 266590    3) 中铁建 工集团山东有限公司，青岛 266100 苣通信作者，E-mail：skd992012@sdust.edu.cn 摘    要    采用有限元分析软件 ABAQUS 建立了非均质土中海上风电单桩基础数值计算模型，将桩基础受到的波浪、洋流及 风荷载等效成双向对称循环荷载，对水平循环荷载作用下桩身水平位移、桩身剪力、桩身弯矩和桩侧土抗力进行了研究，并 对不同循环次数下桩身水平位移进行了对比分析. 研究表明，桩身水平位移随时间变化逐渐累积，随着循环次数的增加，泥 面处桩身最大位移发生的时间点滞后；桩身剪力出现负值；桩身弯矩最大值发生在浅层土体；桩身外壁土抗力曲线随时间的 变化在埋深约 2/3 处出现分界点，分界点上下范围内土抗力变化规律正好相反，在淤泥土和粉砂土分界面处增加显著；不同 时间点桩身内壁沿埋深承担的荷载基本不变. 关键词    非均质土；海上风电；单桩基础；动力响应；水平循环荷载 分类号    TU473.1 Dynamic  response  characteristics  of  an  offshore,  wind-power  monopile  foundation  in heterogeneous soil KONG De-sen1,2) 苣 ，LIU Yi2,3) ，DENG Mei-xu2) ，LI Ya-zhou2) 1) Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China 2) College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China 3) China Railway Construction Group Shandong Co. Ltd., Qingdao 266100, China 苣 Corresponding author, E-mail: skd992012@sdust.edu.cn ABSTRACT    Wind energy is a new kind of inexhaustible energy. It is gradually replacing the traditional energy as its pollution-free and renewable. China has a long coastline, abundant offshore resources, and vast offshore space. Offshore wind farms have gradually become  the  focus  of  wind-power  development.  Large-diameter  single-pile  foundations  are  being  widely  used  in  the  field  of  offshore power generation because of advantages including convenient manufacture and installation, clearer stress conditions compared with pile groups, and affordable cost and economy. Therefore, it becomes significantly relevant to study the dynamic response characteristics of large-diameter single-pile foundations under horizontal cyclic loads to eliminate the dangers hidden in engineering and installation and ensure normal usage during service. A numerical calculation model of an offshore, wind-power monopile foundation in heterogeneous soil  was  established  by  the  finite  element  analysis  software  ABAQUS.  The  wave,  ocean  current,  and  wind  load  on  the  monopile foundation were equivalent to a bidirectional symmetrical cyclic load. The horizontal displacement, shear force, and bending moment along the pile shaft, and pile-side soil resistance under the horizontal cyclic load were studied. Furthermore, the horizontal displacements along  the  pile  shaft  under  different  cyclic  times  were  compared  with  one  another  and  analyzed.  The  results  show  that  the  horizontal 收稿日期: 2020−03−19 基金项目: 山东省自然科学基金资助项目（ZR2019MEE027）；国家自然科学基金资助项目（41372288） 工程科学学报，第 43 卷，第 5 期：710−719，2021 年 5 月 Chinese Journal of Engineering, Vol. 43, No. 5: 710−719, May 2021 https://doi.org/10.13374/j.issn2095-9389.2020.03.19.004; http://cje.ustb.edu.cn