杭州湾跨海铁路桥南岸试挖槽回淤特性研究  

Study on sediment characteristics of the trial excavated trough on the south bank of the Hangzhou Bay Cross-Sea Railway Bridge

作　　者：李有为[1,2] 孙婉静 徐姝琪 肖苡辀 王淦 LI You-wei;SUN Wan-jing;XU Shu-qi;XIAO Yi-zhou;WANG Gan(CCCC Second Harbour Engineering Co.,Ltd.,Wuhan,Hubei 430040,China;CCCC Fourth Engineering Co.,Ltd.,Wuhu,Anhui 241000,China;KeyLaboratory of Large-span Bridge Construction Technology,Wuhan,Hubei 430040,China;Research and Development Center of Transport Industry of Intelligent Manufacturing Technologies of Transport Infrastructure,Wuhan,Hubei 430040,China;CCCC Highway Bridge National Engineering Research Centre Co.,Ltd.,Beijing 100032,China;Nantong-Suzhou-Jiaxing-Ningbo High-soeed Railway Co.,Ltd.,Ningbo,Zhejiang 315300,China)

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]中交二航局第四工程有限公司,安徽芜湖241000 [3]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040 [4]交通运输行业交通基础设施智能制造技术研发中心,湖北武汉430040 [5]中交公路长大桥建设国家工程研究中心有限公司,北京100032 [6]通苏嘉甬铁路有限责任公司,浙江宁波315300

出　　处：《中国港湾建设》2025年第3期52-61,共10页China Harbour Engineering

基　　金：中国博士后科学基金第61批面上资助(2017M612541)。

摘　　要：以杭州湾跨海铁路桥工程为例,通过工程南岸试挖槽地形和水文实测资料建立了水动力数学模型,分析了河床演变趋势,得出试挖槽回淤特征,同时结合杭州湾海域气象特点充分考虑风暴骤淤的可能性,共同解决施工船舶吃水深度不够的问题,指导项目建设过程中的船舶安全施工。结果表明:1)试挖槽位置海床整体呈微冲态势,工程区涨潮流速占优,涨潮平均含沙量约为落潮的1.2~1.8倍,相同潮差下,冬季含沙量高于其他三季;2)试挖槽30d、90 d平均回淤厚度稳定在0.9 m、1.8 m,挖槽开挖后,全潮淤积历时和淤积强度增大,冲刷历时和冲刷强度减小,从而导致挖槽回淤;3)试挖槽具备台风“骤淤”的基础,在强风暴天气下,挖槽内存在出现浮泥层的可能性,但落淤并密实成新淤泥的量值不会太大,建议未来试验中可在台风期开展现场观测。Taking the Hangzhou Bay Cross-Sea Railway Bridge project as an example,this paper established a hydrodynamicmathematical model based on the topography and hydrologic measurement data of the south bank of the project,analyzed theevolution trend of the river bed,and obtained the sediment characteristics of the excavated trough.Meanwhile,combined withthe meteorological characteristics of Hangzhou Bay,we fully considered the possibility of storm sudden silt,jointly solved theproblem of insufficient draft depth of construction ships,and guide the ship safety construction during project construction.The results show that:1) The seabed in the trial excavated trough position is in a microthrusting state as a whole,the floodvelocity in the project area is superior,and the average sediment content of the flood tide is about 1.2-1.8 times that of the ebbtide.Under the same tidal range,the sediment content in winter is higher than that in other three seasons.2) The averagesediment thickness of 30 days and 90 days of trial excavated trough is stable at 0.9 m and 1.8 m.After excavation,the totaltide deposition duration and intensity increase,while the erosion duration and intensity decrease,resulting in sendimentationin the excavated trough;3) The trial excavated trough has the basis of typhoon "sudden silting".In strong storm weather,there is the possibility of floating mud layer in the excavated trough,but the amount of silting and compacting into new silt willnot be too large.It is suggested that field observation can be carried out in the future test during the typhoon period.

关 键 词：试挖槽 水动力特性 回淤沉积动力特性 骤淤 

分 类 号：U652[交通运输工程—港口、海岸及近海工程] TV213.4[交通运输工程—船舶与海洋工程]