考虑横向惯性下填砂竹节管桩纵向振动特性  

Longitudinal Vibration Characteristics of Sand-filled Nodular Pipe Pile Considering Lateral Inertial Effect

作　　者：王奎华[1,2] 刘鑫[1,2] 吴君涛 肖偲 WANG Kuihua;LIU Xin;WU Juntao;XIAO Si(Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学滨海与城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《湖南大学学报（自然科学版）》2020年第5期58-69,共12页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51579217,51779217)。

摘　　要：为研究填砂竹节管桩这一新型复合桩基的纵向振动特性,基于复刚度传递理论,采用多圈层平面应变模型模拟桩周介质的双向非均匀性,在考虑横向惯性效应和桩身阻尼的情况下,结合拉式变换及其逆变换求得桩顶阻抗解析解及桩顶速度时域响应半解析解,并利用已有解验证了本文所得解的合理性.经参数影响分析发现,桩周填砂层性质对复合桩基的动刚度和动阻尼影响较大.所建模型和所得结论为闭口填砂竹节管桩的设计施工及低应变检测提供了理论依据.In order to study the longitudinal dynamic response of the sand-filled nodular pipe pile as a new type of composite pile foundation,the bi-directional inhomogeneity of medium around the pile is firstly simulated by multi-zone plane strain model and the complex stiffness transfer method.Then,considering the lateral inertia effect and the damping of the pile body,the analytical solutions of impedance and semi-analytical solutions of velocity response of the pile head are obtained by Laplace Transformation and Inverse Laplace Transformation.The validity of these solutions is verified by the existing analytical solutions afterwards.Finally,it is found that the properties of the sand-filled layer have great influence on the dynamic stiffness and damping by parameter influencing analysis.The proposed model and obtained conclusions provide a theoretical basis for the design,construction and low strain detection of the sand-filled nodular pipe pile.

关 键 词：填砂竹节管桩 纵向振动特性 复刚度传递 平面应变 解析解 

分 类 号：TU473[建筑科学—结构工程]