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疏桩作用路基的荷载效应剪切位移解析解

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Keywords: 道路工程,路基,剪切位移分析法,桩土应力比,疏桩,土拱效应

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Abstract:

?为揭示疏桩支撑路基结构的荷载传递机理,针对疏桩作用路基的荷载效应特点,基于剪切位移分析法原理和大桩群单元简化模型,提出了疏桩支撑路基内部的荷载传递剪切位移分析模型;通过假定单元模型内、外土柱界面剪切力与对应相对位移的理想弹塑性关系,结合广义剪切位移概念,推导了路基单元模型的荷载传递控制方程,进而考虑疏桩路基中路基-垫层双层结构特点,建立了双层体系下路基荷载传递的剪切位移解析解。研究结果表明:所提出的模型在疏桩路基中具有较好的适用性,可拓展应用于分离式桩筏基础的桩土荷载效应分析。

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