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基于虚土桩模型,对成层广义Voigt地基中桩基纵向振动响应进行研究。将桩截面面积范围内有限层桩端土模拟为与桩完全接触的虚土桩,桩侧土采用广义Voigt模型,结合Laplace变换求得了瞬态半正弦脉冲荷载作用下桩顶频域响应的解析解及时域响应的半解析解;同时采用参数研究方法讨论了单层桩端土和双层桩端土情况下,土层参数对桩顶振动响应的影响,并将虚土桩模型与其他桩端土支承模型进行了对比;最后将理论结果与实际工程桩实测曲线进行了拟合对比。结果表明:该虚土桩模型较为合理,能够较真实地反映桩土相互作用机理。
Based on the model of soil-pile, the longitudinal vibration response of pile foundation in layered generalized Voigt foundation is studied. The finite layer pile end soil in the area of pile section is modeled as a virtual soil pile with complete contact with the pile. The generalized Voigt model is used for the side soil of the pile, and the response of pile top frequency domain is obtained by Laplace transform Solution and the semi-analytical solution of the time-domain response are also discussed. In the meantime, the influence of soil parameters on the vibration response of pile top under the condition of single-layer pile end soil and double-layer pile end soil is discussed by parametric research method. End soil support model are compared; Finally, the theoretical results and actual engineering pile measured curve fitting comparison. The results show that the model of virtual soil pile is more reasonable and can more accurately reflect the interaction mechanism between pile and soil.