沪通长江大桥墩位布设适应性分析

Comprehensive analysis of adaptability of pier layout of Shanghai-Nantong Yangtze River Bridge

为深入研究沪通长江大桥桥墩布设合理性,分析拟建桥梁对12. 5 m深水航道以及船舶通航等的影响,通过物理模型试验从水动力变化、河床冲淤变化、桥址河段通航条件等方面分析拟建桥梁墩位布设的适应性,并对现有的桥位方案和主桥各通航孔向南平移200 m的方案进行了比选分析。同时,于2010年4月和7月进行了桥区河段枯季大、小潮,洪季大、小潮船筏走行线的现场测量。研究表明,在桥位方案确定的情况下,现有墩位方案稍优,能满足实际航行需要。研究结果可为后续大桥建设提供一定的理论指导与技术支持。

In order to further study the rationality of the pier layout of the Shanghai-Nantong Yangtze River Bridge, some analyses of the influences of the planned bridge on 12.5 m deep-water channel and ship navigation are carried out in this paper. Through the physical model tests, the adaptability and rationality of the pier layout of the proposed bridge are analyzed from the aspects of the hydrodynamic force changes, the riverbed scouring and silting changes, the navigable conditions of the river section at the bridge site, etc.. Comparison of the existing bridge site scheme with the scheme of navigable holes of the main bridge moving 200 m southward is also made in this study. The boat track lines in the river section at the bridge site were measured in the period of the spring tides and the neap tides coming respectively in the dry season and flood reason in April and July, 2010. The research and analysis resuhs show that the existing pier scheme is slightly better when the bridge site scheme is determined, because it can meet the requirements of the actual navigation. And the research resuhs can provide certain theoretical guidance and technical support for the bridge construction in the future.