海洋环境中复合桩基水平方向波浪荷载研究  

Numerical Study of Horizontal Wave Load on Composite Pile Foundation in Marine Environment

作　　者：向宝山[1] 王少华 蔡子龙 祝兵[1] 张启博 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中铁大桥勘测设计院,湖北武汉430050

出　　处：《西南交通大学学报》2018年第1期102-108,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(51178397)

摘　　要：为研究承台淹没深度及波浪入射角对桩-承台复合基础水平方向波浪荷载的影响,以平潭海峡公铁两用大桥某复合基础为研究对象,通过求解RANS方程(Reynolds-averaged Navier-Stokes equation)和k-ε湍流模型,借助FLOW-3D软件建立了波浪与复合基础相互作用的三维数值模型.研究了承台淹没深度及波浪入射角对复合基础水平方向波浪荷载的影响,并给出了不同波浪入射角下复合基础水平方向波浪荷载幅值随承台淹没深度的变化曲线.研究结果表明:承台位于波峰与波谷之间时,复合基础所受波浪荷载较大,承台淹没深度为1倍承台高度时波浪荷载达到峰值;当波浪入射角定义为承台长轴线与波浪传播方向之间夹角时,复合基础所受波浪荷载随着波浪入射角增大,当波浪入射角达到90°时,波浪荷载最大,其值约为波浪入射角为0°时的1.4倍左右.To inve st igate the effects of pi le c a p subme rg ed depth a nd wave obl iq ui ty on wave load on a composite pile foundation, a th re e -d im en s io n a l n um e r ic a l model for w a v e -s tru c tu re in te ra c t io n a roun d the Pingtan Strait railway bridge foundation was established. This model was based on the CFD code FLOW-3D, in which the Reynolds-averaged Navier-Stokes （ R A N S ） eq u a t io n an d k s tu rb u le n c e model are used for wave simulations. After validating by analytical solutions and previous laboratory experiments, the model was used to study the effects of pile cap submerged depth and wave obliquity on wave load on the composite foundation. The numerical results indicate that the pile cap submerged depth can significantly affect the wave load on the composite pile foundation, a n d th e wave load on the pile foundation is maximum when the submerged depth is approximately 1 times the pile cap thickness. In addition, th e hor izo ntal wave load on th e composite found at ion inc re a se s with th e in c remen t of wave incidence angle when the incidence wave angle is defined as the angle between the long axis of the cap and the wave propagation direction. When the wave incidence angle is 90°,th e wave load on the foundation is approximately 1.4 times that with a wave incidence angle of 0°.

关 键 词：RANS 承台淹没深度 波浪人射角 复合基础 波浪 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]