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工程力学  2014 

非完全粘结下饱和土中桩扭转振动的解析解

, PP. 156-161

Keywords: 饱和土,端承桩,非完全粘结,接触面,扭转振动,解析解

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Abstract:

采用解析方法研究了桩土界面非完全粘结条件下饱和土中端承桩的扭转振动问题。利用Kelvin模型模拟饱和土层和端承桩接触面的相对滑移,与以往桩土界面连续性模型进行了对比。根据Biot波动原理,采用Novak薄层法推导了饱和土层对扭转振动桩的动力阻抗。将端承桩等效为Euler-Bernoulli杆模型,给出了桩顶动刚度因子和等效阻尼随激励频率的响应。通过算例分析了相对滑移和连续性两种模型条件下桩顶刚度因子和等效阻尼的差异。结果表明:当外荷载激励频率较大时,完全粘结条件下桩顶动刚度和动阻尼的振幅小于滑移条件下桩顶动刚度和动阻尼的振幅。因此,采用非完全粘结条件模拟桩土接触面更为合理。

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