苏通长江大桥的工程地质研究

过去10年来,随着城市化加快发展,促进了长江下游特大型桥梁的建设,其中主跨1 088m的苏州—南通特大斜拉桥就是其中之一。苏通大桥位于巨厚的第四系覆盖层地区,因此,土层结构特征、持力层和基础型式的选择,以及工程参数的确定成为主要工程地质问题,需要研究解决。应用岩土工程优势面理论对苏通大桥的研究思路,着重介绍了在巨厚覆盖层地基中用层组结构划分和优势层的研究观点,用优势指标法量化判定桩和沉井基础的持力层以及用多法求合理设计参数和提出若干工程设计与施工的建议等三方面问题的研究成果,从而推动了该工程的顺利进行。

On study of engineering geology in Su-Tong Yangtze River Bridge

For the past ten years,as rapid development of urbanization in China,many large-scale bridges have been built over the Yangtze River,Su-Tong skew bridge with a main span of 1 088m is one of them.Located in overburden area with giant-thick of Quaternary sediments,there are major engineering geological problems such as structure characters of soil bed,selection of bearing stratum and foundation type,determination of engineering parameters during construction of Su-Tong Bridge.As a study method,it's very effective that preferred plane theory of geotechnics is used to solve these complex engineering geological problems around the bridge.Especially study results of three problems are stressed: 1.using views of set structure and preferred stratum to solve foundation covered with giant-thick sediments;2.confirming bearing stratum of filling pile and sunk well foundation by preferred indicators;3.obtaining suitable design parameters by multiple methods and suggestions on the engineering design and operation during the construction of Su-Tong Bridge.