上海东海大桥周围海床演变与失稳风险研究

Processes of seabed evolution and risk of instability around Shanghai Donghai Bridge

跨海大桥的地形冲刷是近年来的研究热点之一,对东海大桥2002-2015年间周围海床地形的监测成果进行分析。结果表明:东海大桥建桥后一直处于冲刷状态,研究区域内-10 m和-11 m等深线包络面积一直在扩大,大桥轴线西侧冲刷大于东侧,大桥北段和南段各有一个较严重的冲刷区,平均冲刷深度在1~2 m左右,南汇边滩围垦工程和洋山港陆连堵汊工程是导致这两个区域冲刷严重的主要原因。建议未来加强东海大桥桥墩局部冲刷地貌和大桥沉降及偏移的监测,并适时进行抛石等施工维护。

A bridge across the sea erosion terrain is one of the important research topics in recent years.Monitoring results of the seabed topography under Donghai Bridge from 2002-2015 show that the bathymetric envelope area in the study area between -10 m and -11 m was expanding.The bridge scour is greater in the west than that in the east of the bridge axis.There are severe erosion areas in north and south of the bridge,with a scour depth about 1~2 m.Analysis show that the Nanhui beach reclamation project of Yangshan Port and land even branch plugging project are main causes of serious erosion.It is suggested to strengthen the monitoring of local scour and settlement of bridge piers in the East China Sea Bridge in the near future.