地震作用下大直径嵌岩单桩动力响应数值分析  

Numerical analysis of dynamic response of large-diameter rock-socketed monopiles under seismic loads

作　　者：贺瑞[1] 朱元张 张继生[1] 吉吉 国振[2] HE Rui;ZHU Yuanzhang;ZHANG Jisheng;JI Ji;GUO Zhen(College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]浙江大学建筑工程学院,浙江杭州310058

出　　处：《河海大学学报（自然科学版）》2023年第1期66-76,共11页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(51879097)。

摘　　要：以大直径嵌岩单桩为研究对象,对地震荷载作用时桩、土、岩的变形规律及桩基刚度进行分析,在有限元-无限元耦合数值模拟中引入土体非线性黏弹性本构模型与岩体损伤本构模型来描述桩周土、岩介质刚度随应变衰减的特性。数值模拟结果表明,大直径嵌岩单桩位移、加速度等动力响应,土体非线性滞回特性以及岩石损伤程度等显著受到桩基嵌岩深度、岩石风化程度和地震烈度等因素的影响,在设计时应深入分析。Large-diameter monopile is taken as the research object to analyze the deformation behavior of pile, soil and rock, and the stiffness of pile foundation under seismic loads. A nonlinear viscoelastic constitutive model of soil and a damage model of rock mass are introduced to describe the stiffness degradation characteristics of soil and rock media around piles in the finite element-infinite element coupled numerical simulation. The numerical simulation results show that the dynamic responses of large-diameter rock-socketed pile, such as displacement and acceleration, the nonlinear hysteresis characteristics of soil and the damage degree of rock are mainly affected by the depth of rock-socketed pile, the degree of rock weathering and seismic intensity, and should be deeply analyzed in the design.

关 键 词：大直径 嵌岩单桩 黏弹性本构模型 损伤模型 地震荷载 桩土动力相互作用 

分 类 号：TU476[建筑科学—结构工程]