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为了考虑桩周土体沿径向的非均质特性,将桩周饱和土划分为内域饱和土和外域饱和土两部分,运用多孔介质理论和桩基动力学理论建立径向非均质饱和土-桩动力相互作用模型.在此基础上,利用Novak平面假定和数学物理方法并考虑桩-土系统的连续性条件和边界条件,求解了非均质饱和土中单桩的纵向振动,并得到了桩顶的复刚度.通过数值算例考察了内、外域饱和土力学性质的差异对单桩纵向振动的影响.研究表明,桩周饱和土弱化范围内、外域剪切模量比和密度比对桩纵向振动影响较大,而内、外域液固耦合系数的差异几乎没有影响.
In order to consider the radial heterogeneity of the soil around the pile, the saturated soil around the pile is divided into two parts, inner saturated soil and outer saturated soil. Using the theory of porous media and pile foundation dynamics, radial inhomogeneous saturation Soil-pile dynamic interaction model.On this basis, using Novak plane assumption and mathematical physics method and taking into account the continuity and boundary conditions of pile-soil system, the longitudinal vibration of single pile in heterogeneous saturated soil is solved And the complex stiffness of pile top is obtained.The influence of the difference of mechanical properties of saturated soil on the longitudinal vibration of the pile is investigated by numerical examples.The results show that the shear modulus ratio and density Which has a greater influence on the longitudinal vibration of the pile, while the difference of the liquid-solid coupling coefficient between the inner and outer zones has almost no effect.