承台淹没深度对海洋桥梁基础波浪荷载的影响

发布时间：2018-08-26 09:23

【摘要】：为研究承台淹没深度对海洋桥梁桩-承台复合基础波浪荷载的影响,指导复合基础设计,通过求解RANS方程和k-ε湍流模型,借助CFD软件建立波浪与复合基础相互作用的三维数值模型,计算不同承台淹没深度时复合基础周围流场特征以及波浪荷载随时间的变化规律。结果表明:受基础阻水作用影响,复合基础周围流场紊乱,且周围流向发生改变;当承台底面位于波峰位置以上时,承台位置变化对复合基础波浪荷载没有影响;当承台位于波谷与波峰之间位置时,随承台淹没深度增加,复合基础波浪荷载先增大后减小;当承台顶面位于波谷位置以下时,随承台淹没深度增加,复合基础波浪荷载逐渐减小,且淹没深度越大,减小幅度越不明显。实际工程设计时,综合考虑各方面的影响,为避免复合基础所受波浪荷载过大,应尽量避免将承台设计在水面附近。
[Abstract]:In order to study the influence of the depth of cap submergence on the wave load of pile-cap composite foundation of ocean bridge, and to guide the design of composite foundation, the RANS equation and k- 蔚 turbulence model are solved. A three-dimensional numerical model of the interaction between wave and composite foundation is established by using CFD software. The characteristics of the current field around the composite foundation and the variation of wave load with time are calculated under different submerged depths of the cap. The results show that the flow field around the composite foundation is disordered and the flow direction of the composite foundation is changed, and when the bottom surface of the cap is above the peak of the wave, the change of the cap position has no effect on the wave load of the composite foundation. When the cap is located between the trough and the peak, the wave load of the composite foundation increases first and then decreases with the increase of the depth of the cap, and when the top surface of the cap is below the trough, the depth increases with the submergence of the cap. The wave load of composite foundation decreases gradually, and the greater the depth of submergence, the less obvious the decrease is. In order to avoid the excessive wave load on the composite foundation, the cap should be designed near the water surface as far as possible.
【作者单位】：西南交通大学桥梁工程系;中铁大桥勘测设计院集团有限公司;
【基金】：国家自然科学基金项目资助(10902112,41176073) 中央高校基本科研业务费专项资金资助(2682017QY02)
【分类号】：TV139.26;U443.1

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