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基于饱和多孔介质理论,将土体视为液固饱和两相介质,利用Novak薄层法得到了饱和土的竖向动力阻抗,利用传递矩阵法研究了饱和土中桩的纵向振动并进行了参数分析。研究结果表明:桩周土的性质、土层厚度和土层分布对桩顶复刚度有很大的影响,土层剪切模量比越小,复刚度随频率变化曲线的峰值越小,峰值的间隔也越小;对于上软下硬土层,下层硬土层越厚,桩的复刚度随频率变化曲线的峰值越小;土层液固耦合系数的差异对桩的纵向振动特性也存在一定的影响,但相对较小。
Based on the theory of saturated porous media, the soil is considered as a two-phase liquid-solid saturated medium. The vertical dynamic impedance of saturated soil is obtained by the Novak thin layer method. The longitudinal vibration of the pile in saturated soil is studied by using the transfer matrix method. analysis. The results show that the properties of the soil surrounding the pile, the thickness of the soil layer and the distribution of the soil layer have a great influence on the complex stiffness of the pile top. The smaller the shear modulus ratio of the pile, the smaller the peak value of the complex stiffness with the frequency curve, The smaller the interval between the two layers, the smaller the thickness of the lower hard layer, the smaller the peak value of the complex stiffness of the pile with the frequency curve; the difference of the liquid-solid coupling coefficient of the soil also has the longitudinal vibration characteristics of the pile A certain impact, but relatively small.