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特大型桥梁群桩基础承载特性离心模型试验研究

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Keywords: 桥梁工程,特大型桩基础,承载特性,离心模型试验,荷载分布

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Abstract:

苏通大桥超大型主桥索塔群桩基础置于第四系土层中,其承载变形特性是设计急待解决的技术问题.通过离心模型试验,研究了5种工况下主桥索塔群桩基础的竖向承载变形特性,分析了承台竣工、裸塔竣工、成桥阶段群桩基础的沉降及桩顶荷载分布规律.结果表明,5种工况下主桥索塔群桩基础的极限承载力大于5000MN,成桥阶段的总沉降为148~186mm,基础整体稳定,桩顶荷载成W形分布,桩底注浆和冲刷形态对群桩基础的承载变形特性有一定影响.

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