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考虑桩-土滑移的柔性基础下复合地基沉降分析方法

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Keywords: 道路工程,复合地基,理论分析,柔性基础,沉降,桩-土相对滑移

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Abstract:

？为了考虑柔性基础下复合地基桩-土相对滑移特性和桩间土竖向应力变化对其沉降计算的影响,在分析复合地基沉降变形机理基础上,根据桩-土界面剪切变形特性,假定桩-土界面剪应力和剪切相对位移关系服从理想弹塑性模型,并将复合地基沉降视为由塑性区、弹性区和下卧层压缩变形区3个部分组成;根据塑性区桩-土界面剪应力与相对位移的关系特性,通过分析桩与桩间土竖向应力,建立塑性区压缩量分析方法;针对桩间土竖向应力变化特征,在对现有桩间土竖向位移模式进行改进的基础上,建立了考虑桩间土竖向应力变化和桩-土相对位移的弹性区压缩量计算模型,并采用已有复合地基下卧层压缩量分析方法计算下卧层的压缩量,从而建立柔性基础下复合地基沉降计算新方法。研究结果表明:该方法可反映桩-土相对滑移和桩间土竖向应力变化对沉降的影响;通过工程实例计算与其他同类方法进行对比分析,表明该方法合理、可行。

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