This study establishes a theoretical framework for analyzing the lateral oscillation of marine pipe piles. The additional mass model is introduced herein to consider the inertial fluctuation effect of the soil plug. Analytical mathematical methods are used to determine the complex impedance variation of the pile over a range of frequency effects. An investigation is performed to determine how the presence of soil plugs changes the lateral complex stiffness and natural frequency of pipe piles. Additionally, comparisons of the applicability of the plane strain model and continuous medium model have been conducted to enable the easy use of the theoretical model. The main conclusions can be drawn as (1) if the fluctuation inertia effect of the soil plug is not taken into consideration, the dynamic active length and the dynamic stiffness of the pipe pile will be underestimated; (2) for the soft soil, the plane strain model may give rise to substantial calculation errors attributed to them regardless of the vertical continuity of the soil, nevertheless, the calculation error decreases rapidly with the increase of soil shear modulus and vibration frequency.

中文翻译：

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考虑土塞效应的饱和土中海上管桩横向运动特性


本研究建立了分析海洋管桩横向振动的理论框架。本文引入附加质量模型来考虑土塞的惯性波动效应。分析数学方法用于确定桩在一定频率影响范围内的复阻抗变化。进行了一项调查，以确定土塞的存在如何改变管桩的横向复杂刚度和固有频率。此外，还对平面应变模型和连续介质模型的适用性进行了比较，以方便理论模型的使用。主要结论为：（1）如果不考虑土塞的波动惯性效应，会低估管桩的动活动长度和动刚度； (2)对于软土，无论土体竖向连续性如何，平面应变模型都会产生较大的计算误差，但随着土体剪切模量和振动频率的增加，计算误差迅速减小。