海上风电单桩基础周围非均质土体横向土抗力分布特性研究  

Study on lateral soil resistance distribution characteristics of heterogeneous soil around monopile foundation for offshore wind power

作　　者：孔德森[1,2] 刘一 邓美旭 侯迪 Kong Desen;Liu Yi;Deng MeixuHou Di(Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,266590,Qingdao,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,266590,Qingdao,China;China Railway Construction Group Shandong Co.Ltd.,266590,Qingdao,China)

机构地区：[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266590

出　　处：《应用力学学报》2021年第3期943-949,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(41372288);山东省自然科学基金(ZR2019MEE027);山东科技大学研究生科技创新项目(SDKDYC190120)。

摘　　要：采用有限元软件ABAQUS建立了非均质土中海上风电单桩基础数值计算模型,将波浪、洋流、风荷载等效为双向对称循环荷载,分析了同一循环过程中不同埋深处和相同埋深处不同循环过程中桩身内外壁土抗力沿桩环向的变化规律。研究表明:随着循环次数的增加,在淤泥土和粉砂土层分界面处,桩身内壁土抗力沿桩环向呈先增加后减小交替分布;桩身外壁被动土压力减小,而主动土压力增大;泥面处桩身外壁被动土压力变化程度较大,随着埋深的增加,主动土压力变化程度较大;桩身内壁主要承担荷载的位置由两侧转向中部。A numerical calculation model of offshore wind power monopile foundation in heterogeneous soil is established by finite element software ABAQUS.The wave,ocean current and wind load are equivalent to a bidirectional symmetrical cyclic load.The distribution characteristics of soil resistance of pile inner and outer wall along the circular direction of pile in different burial depths of the same cycle and different cycles at the same burial depth are analyzed.The results show that with the increase of cycle times,at the interface of silt soil and mealy sand soil,the soil resistance of pile inner wall increases first and then decreases alternately along the circular direction of pile.The passive earth pressure decreases while the active earth pressure increases with the increase of the number of cycles.The passive earth pressure on the outer wall of piles at mud surface varies greatly,and the active earth pressure varies greatly with the increase of buried depth.The main load-bearing area of the inner wall of the pile is shifted from the sides to the middle of the pile.

关 键 词：海上风电 单桩基础 非均质土 土抗力 分布特性 

分 类 号：TU473.1[建筑科学—结构工程]