中文摘要：

采用考虑了桩周土的非匀质性的Novak薄层法计算桩土相互作用的方法，对考虑径向非匀质性的层状地基中摩擦桩竖向动力阻抗的简化计算方法进行了研究，得到了相应的计算公式．并分析了桩周土非匀质性、泊松比、频率等因素对单桩竖向动力阻抗的影响．分析结果表明：非匀质区刚度与匀质区刚度比对单桩竖向动力阻抗基本无影响，泊松比、非匀质区大小则有较大影响．

英文摘要：

On the basis of the research on the simple analytical computation on the vertical dynamic impedance of single-pile, Novak layer method, which applies the computation of the dynamic impedance to vertical vibration for radially inhomogeneous soil, was introduced to analyze vertical dynamic pile-soil interaction. The simple analytical computation on the vertical dynamic impedance of floating pile in layered soil was studied. The study included the radial inhomogeneity of soil, and the computing formula of vertical dynamic impedance of floating pile was obtained. Based on the computing formula, it was found that the stiffness ratio of the inhomogeneous soil to the homogeneous soil had little effect on the vertical dynamic impedance of floating pile and the size of the inhomogeneous zone and Poisson＇s ratio had some effect on the vertical dynamic impedance of floating pile.