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针对静钻根植竹节桩这一新桩型特殊的桩身结构及桩土接触条件,基于考虑土体竖向波动效应的三维轴对称模型研究其纵向振动阻抗。首先,采用虚土桩模型模拟桩底土对桩端的支承作用,根据桩周土的成层性和桩身竹节的分布情况,将桩土体系沿纵向划分成有限个微元段,同时,将桩周土沿径向划分为有限个圈层以考虑其径向非均质性;然后,利用Laplace变换和阻抗函数递推方法,得到桩顶频域响应解析解;在此基础上,将退化解与已有文献的解进行对比,证明退化解的合理性;最后,在桩基设计中比较关心的低频范围内分析桩身竹节、桩周水泥土及桩底土参数对静钻根植竹节桩桩顶纵向振动阻抗的影响。
Aiming at the special pile structure and pile-soil contact condition of static drilling rooted bamboo piles, this paper studies the longitudinal vibration impedance based on the three-dimensional axisymmetric model which considers the vertical fluctuation effect of soil. First, the soil-pile model is used to simulate the supporting effect of pile-bottom soil on the pile-end. According to the stratification of the soil around the pile and the distribution of pile bamboo, the pile-soil system is divided longitudinally into finite number of micro- The soil around the pile is radially divided into a finite number of spheres to account for its radial heterogeneity. Then, the analytical solutions of pile top frequency domain response are obtained by Laplace transform and impedance function recursion method. On this basis, The solutions of the literature have been compared to prove the rationality of the degradation solution; Finally, in the low frequency range of pile foundation design more concerned about the analysis of pile slub, Effect of top longitudinal vibration impedance.