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由于饱和土中土体颗粒与孔隙水的相互作用以及桩与土体的不同渗透率,饱和土体中桩基的力学行为与单相土中桩基力学行为有很大的差别。基于饱和多孔介质理论,考虑桩纵向振动时的横向变形及惯性效应,将桩等效为Rayleigh-Love杆,在频率域中研究了饱和黏弹性土层中端承桩纵向振动的动力特性,给出了饱和黏弹性土层和桩纵向振动时动力响应的解析解及桩头复刚度的解析表达式。通过数值计算,给出了桩头动刚度因子和阻尼随激励频率的响应,考察了饱和土物性参数、桩土模量比、桩长径比、泊松比等参数对桩头刚度因子和阻尼的影响。研究表明,对于大直径桩,当外载荷激励频率较大时桩横向效应对桩头刚度因子和阻尼有显著的影响。
Due to the interaction between soil particles and pore water in saturated soil and the different permeability of pile and soil, the mechanical behavior of pile foundation in saturated soil is very different from that of pile foundation in single-phase soil. Based on the theory of saturated porous media, considering the lateral deformation and inertial effect of longitudinal pile, the pile is equivalent to Rayleigh-Love rod, and the dynamic behavior of longitudinal vibration of end bearing pile in saturated viscoelastic soil is studied in frequency domain The analytical solutions of the dynamic response of the saturated viscoelastic soil layer and longitudinal vibration of the pile and the analytic expression of the complex stiffness of the pile head are presented. Through the numerical calculation, the dynamic stiffness factor of the pile head and the response of the damping with the excitation frequency are given. The effects of the parameters of saturated soil, the ratio of pile-soil modulus, the ratio of pile diameter to diameter, Poisson’s ratio to the stiffness factor and damping Impact. The results show that for large diameter pile, the lateral effect of pile has a significant effect on the stiffness factor and damping of pile head when the external excitation frequency is large.