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在考虑大直径桩尺寸效应及桩端土应力扩散效应情况下,进行了非均质土中大直径桩的纵向振动研究。利用Rayleigh-Love杆理论,考虑大直径桩桩身的横向惯性效应;引入扩散虚土桩模型模拟桩端土对桩身的支承作用;桩侧土考虑径向非均质,采用复刚度传递多圈层平面应变模型——以此建立桩-土耦合振动系统的简化模型。结合边界条件、初始条件和连续条件,推导得出大直径桩桩顶速度的频域解析解和时域半解析解。通过各种工况下相关参数对桩顶动力响应的影响分析,得出非均质土中大直径桩的振动规律。
The longitudinal vibration of large diameter pile in heterogeneous soil is studied considering the effect of large diameter pile size and the stress diffusion of pile tip soil. Using the Rayleigh-Love rod theory, the lateral inertia effect of large-diameter pile body is considered. The diffusion soil-pile model is introduced to simulate the supporting effect of pile-end soil on the pile body. The pile side soil is considered as radial heterogeneity, Stratum Plane Strain Model - A Simplified Model of Pile - Soil Coupling Vibration System. Combined with the boundary conditions, initial conditions and continuous conditions, the analytical solution of the frequency domain and the semi-analytical solution in time domain of the top speed of large-diameter pile are deduced. Through the analysis of the influence of relevant parameters on the dynamic response of pile top under various working conditions, the vibration law of large diameter pile in heterogeneous soil is obtained.