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利用Winkler地基模型来模拟管桩与桩周土、管桩与桩芯土的动力相互作用,在忽略桩周土、桩芯土的径向、环向位移的情况下,得到了Winkler地基模型的刚度系数和阻尼系数。在Winkler地基模型的基础上建立了主动管桩和被动管桩的纵向振动方程,将相互作用因子的概念扩展应用到管桩-管桩纵向动力相互作用,得到了管桩-管桩纵向动力相互作用因子。在叠加原理和管桩-管桩动力相互作用因子的基础上,求解了管桩的纵向振动,得到了管桩的纵向动力阻抗。通过数值算例分析了相关参量对管桩-管桩纵向动力相互作用和群管桩纵向振动的影响。研究结果表明:管桩内外半径比、桩土剪切模量比、管桩长径比对管桩-管桩纵向动力相互作用和群管桩纵向振动有较大的影响,桩间距较大时管桩-管桩纵向动力相互作用因子和群桩动力阻抗随频率变化曲线波动越大;管桩壁厚不宜过薄。
The Winkler foundation model is used to simulate the dynamic interaction between the pipe pile and the soil around the pile, the pile pipe and the pile core soil. The radial and circumferential displacements of the soil around the pile and the pile core are neglected. The Winkler foundation model Stiffness and damping factors. Based on the Winkler foundation model, the longitudinal vibration equations of active pipe pile and passive pipe pile are established, and the concept of interaction factor is extended to the longitudinal dynamic interaction of pipe pile - pipe pile. The longitudinal power of pipe pile - The role of factors. Based on the principle of superposition and the dynamic interaction of pipe pile and pipe pile, the longitudinal vibration of pipe pile is solved and the longitudinal dynamic impedance of pipe pile is obtained. Numerical examples are used to analyze the influence of relevant parameters on the longitudinal dynamic interaction of pipe pile and pipe pile and the longitudinal vibration of pile group. The results show that the ratio of internal to external pipe radius, shear modulus of pile and soil, and the ratio of pipe to pipe length have a significant influence on the longitudinal dynamic interaction of pipe pile and pipe pile and longitudinal vibration of pipe pile. When the pile spacing is large Longitudinal dynamic interaction between pipe pile and pipe pile and dynamic fluctuation of pile group fluctuate with frequency. The wall thickness of pipe pile should not be too thin.