动力荷载作用下水-桩-土相互作用简化分析研究  

Simplified analysis of water-pile-soil interaction under dynamic loads

作　　者：黄义铭 赵密[1] 王丕光[1] 曹艳辉 杜修力[1] HUANG Yi-ming;ZHAO Mi;WANG Pi-guang;CAO Yan-hui;DU Xiu-li(Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China;Beijing Municipal Road&Bridge Group Co.LTD.,Beijing 100045,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]北京市政路桥股份有限公司,北京100045

出　　处：《振动工程学报》2022年第6期1511-1520,共10页Journal of Vibration Engineering

基　　金：国家自然科学基金面上项目(52078010);教育部创新团队(IRT_17R03)。

摘　　要：针对近海结构单桩基础在动力荷载作用下发生复杂的水-桩-土相互作用问题,建立了三维水-桩-土全耦合动力有限元分析模型。土体、桩和水体分别采用实体单元和声学单元模拟,土体截断边界采用滚轴边界条件、水体截断边界采用无反射吸收边界条件,并确定了合理的截断边界位置;以全耦合分析模型计算结果为参考解,系统研究了四种动荷载作用下水-桩不耦合(两者界面自由)和水-土不耦合(两者界面自由)对桩体和海床表面位移和动水压力响应的影响,揭示了不同水深和桩体半径变化下不考虑两种相互作用的影响规律。Aiming at the complex water-pile-soil interaction problem of the single-pile foundation of offshore structures under dynamic loads,this paper establishes a three-dimensional water-pile-soil fully coupled dynamic finite element analysis model.The soil,pile and water are simulated by the solid elements and acoustic media,respectively.The truncation boundary of soil is simulated by roller boundary condition and the truncation boundary of water is adopted by non-reflective absorption boundary condition,and the reasonable truncation boundary position is determined.Then the calculation results of the full coupling analysis model are taken as the reference solution,the effects of four kinds of dynamic load on the displacement and hydrodynamic pressure response of the pile and seabed surface with the water-pile decoupling and water-soil decoupling are systematically studied,and the influence of soil thickness,water depth and pile radius is also discussed.

关 键 词：动力荷载 圆形桩体 数值模拟 水-土相互作用 水-桩相互作用 

分 类 号：TU311.3[建筑科学—结构工程]