沪通长江大桥工程河段河床演变及桥位比选

摘要

Hutong Changjiang River Bridge, a key project of the newly-built Shanghai-Nantong railway and Nantong-Suzhou-Jiaxing inter-city railway, will be the longest span high way-railway bridge in the world and 3 bridge sites of Shier-wei, Shisanwei and Xijiegang in Chengtong reach of Changjiang River were primarily selected and compared from aspects of river-bed evolution,including the variation of shoreline, contour line, talweg and cross-sections. The results show that the selected river reach is qualified to bridge construction in general, the Shierwei cross-section is the most stable while Xijiegang cross-section is poorest in stability;taking account of the shoreline resources utilization, Shisanwei cross-section is recommended as the bridge site. Relevant study results provide technical basis to the design and decision making of Hutong Yangtze River Bridge.%沪通长江大桥是新建沪通铁路及通苏嘉城际铁路的控制性工程，建成后将成为世界上跨度最大的公铁两用斜拉桥。初步选定十二圩、十三圩和西界港作为备选桥位，随后通过河床演变分析，从岸线、等高线、深泓线和断面的变化4个方面对桥位进行了深入比选。分析结果认为：工程河段具备建桥的宏观河势条件；十二圩河段较为稳定，十三圩河段次之，西界港河段变化较大。综合考虑岸线资源利用，推荐十三圩桥位方案，研究成果可为拟建桥梁的设计与决策提供更为充分的技术依据。