摘要
针对宁波象山港大桥桥墩冲刷严重问题,为了剖析潮流径流共同作用下跨海大桥复式桥墩局部冲刷机理,科学预测桥墩局部冲刷规律,通过系统分析、评估、复核象山港大桥相关试验成果和现场实测数据,深入研究了象山湾内关键水文泥沙参数(波浪、潮流、潮位、泥沙量、海底冲刷)变化特征,利用主因子分析及量纲分析等手段,建立象山港大桥桥墩局部冲刷公式,并利用观测数据进行验证。研究表明,象山湾内各涨急落急流速变化不大,涨急和落急之间差别明显。涨急和落急时的代表垂线平均流速分别为-1 m/s和1.14 m/s,且涨落急时刻对应的代表潮位分别为1.37 m和0.54 m。针对象山港大桥桥墩特性分别建立三类桥墩局部冲刷公式,计算得到的预测值与观测值误差在±5%以内,说明所提出的预测公式具有较好的预测效果,能有效地揭示象山港大桥的冲刷规律。
Aiming at the problem of the serious scour on the pier of Xiangshan Port Bridge in Ningbo,the changing characteristics of the key hydrological and sediment parameters(wave,tidal current,tide level,amount of sediment,seafloor scour)in Xiangshan Bay are deeply studied herein through the systematical analysis,assessment and recheck of both the relevant experimental results and the in-situ measured data,so as to analyze the mechanism of the local scour on the double-pier of the sea-crossing bridge under the common effect from tidal current and runoff and scientifically predict the law of the local scour of the bridge pier,while the local scouring formulas for the pier of Xiangshan Port Bridge are established by means of main factor analysis,dimension analysis,etc.,which are verified through the relevant observed data as well.The study shows that the variations of all the tidal current velocities during both the fast flood-tide and the fast ebb-tide are less,while the difference between the fast flood-tide and the fast ebb-tide is obvious.The mean velocities of the typical vertical lines during both the fast flood-tide and the fast ebb-tide are-1 m/s and 1.14 m/s respectively,while the representative tidal levels corresponding to the moments of the fast flood-tide and the fast ebb-tide are 1.37 m and 0.54 m respectively.The errors between the predicting values obtained from the three kinds of the local scour formulas respectively established for the characteristics of the pier of Xiangshan Port Bridge and the observed values are within±5%,thus it is demonstrated that the predicting formulas proposed herein have feasible predicting effects and then can effectively reveal the scouring law of Xiangshan Port Bridge.
作者
郑小颖
王洁光
戚林玲
许琳
史永忠
丁赟
张向东
ZHENG Xiaoying;WANG Jieguang;QI Linling;XU Lin;SHI Yongzhong;DING Yun;ZHANG Xiangdong(Ningbo Communications Investment Road Operation and Management Co., Ltd., Ningbo 315000,Zhejiang, China;Zhejiang Surveying Institute of Estuary and Coast, Hangzhou 310008, Zhejiang, China;College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, Jiangsu, China;Ningbo Water Conservancy Project Quality and Safety Management Center, Ningbo 315016, Zhejiang, China)
出处
《水利水电技术》
北大核心
2020年第8期111-118,共8页
Water Resources and Hydropower Engineering
基金
宁波市交通科技运输项目(201930)
国家重点研发计划项目(2016YFC0402503)。
关键词
象山港大桥
桥墩
局部冲刷
潮流
水力特性
泥沙
Xiangshan Port Bridge
bridge pier
local scour
tidal current
hydraulic characteristics
sediment
