复杂海洋环境大型钢沉井定位下放波流荷载效应研究  

Numerical Analysis of Wave-Current Loads on Large Steel Caisson in Complex Marine Environments During Sinking Process

作　　者：伍敏 WU Min(CCCC Harbor&Channel Engineering Bureau Group Co.,Ltd.,Shenzhen 518100,China)

机构地区：[1]中国铁建港航局,广东深圳518100

出　　处：《桥梁建设》2025年第1期103-109,共7页Bridge Construction

摘　　要：为了解复杂海洋环境下大型钢沉井下放过程中的受力性能,以西堠门公铁两用大桥金塘岛侧桥塔钢沉井为背景,建立波流-钢沉井相互作用的流固耦合模型,研究水流作用下(波高为0)及波流共同作用下(波高为3、4、5 m)不同流速与钢沉井下放位置对钢沉井结构受力的影响。结果表明:钢沉井结构水平力受流速的影响巨大,水流单独作用下,流速从1 m/s增加至4 m/s时,同一位置钢沉井结构的峰值水平力最大增幅达575.27%;波流共同作用较水流单独作用时钢沉井结构水平力大幅增大,水流作用和波流共同作用对钢沉井结构垂直力整体影响不大;钢沉井定位下放过程应充分考虑波流共同作用和结构位置的影响;随着钢沉井结构的持续下放,钢沉井结构自身应力也随之增大,最大应力增大约116.88%,且应力多集中于缆绳与钢沉井的连接部位,应重点关注。This study investigates the wave-current loads on the large steel caisson in complex marine environments during the sinking process.The Xihoumen Rail-cum-Road Bridge was applied as a case.Numerical analysis was conducted to analyze the responses of the steel caisson to wave-current loads with a fluid-solid coupling model.The dynamic responses of the caisson at different sinking depths at different current velocities under pure current forces(wave height=0)and under combined wave and current forces(with wave heights of 3,4,and 5 m),respectively,were compared.The results demonstrate that the horizontal forces on the steel caisson are prone to the current velocities,at the same sinking depth,the peak horizontal forces were increased by a maximum 575.27%when the current velocity was increased from 1 m/s to 4 m/s.The horizontal forces on the steel caisson are substantially increased under the wave-current loads rather than under the pure current loads,while the overall vertical forces on the steel caisson showed minor changes under the wave-current loads.The influences of the wave-current loads and sinking depth of the steel caisson should be considered sufficiently during the positioning and sinking process.As the sinking depth increases,the stresses in the caisson structure correspondingly scale up,with the maximum stresses increased by 116.88%.The connections of ropes and caisson should be given great concerns since these are sensitive locations to stress concentration.

关 键 词：大型钢沉井 钢沉井下放 波流作用 波高 水流流速 下放位置 受力分析 数值模拟 

分 类 号：U443.131[建筑科学—桥梁与隧道工程] U445.557[交通运输工程—道路与铁道工程]