考虑挤土效应时楔形桩纵向振动阻抗研究

发布时间：2018-11-02 18:03

【摘要】：基于复刚度传递多圈层平面应变模型,研究考虑桩周土挤土效应时成层地基中楔形桩的纵向振动问题。首先根据桩周土体的纵向成层情况并考虑楔形桩的变截面特性,将桩土系统沿纵向划分为有限个微元段,对每个微元段的桩周土体建立复刚度传递多圈层平面应变模型,并通过剪切复刚度递推方法求得桩周土作用在桩身的剪切复刚度;然后将求得的剪切复刚度代入桩身纵向振动控制方程,运用Laplace变换技术和阻抗函数递推方法,推导得到考虑桩周土挤土效应时成层地基中楔形桩纵向振动时桩顶复阻抗的解析解;最后,采用参数研究方法在低频范围内分析挤土效应对桩顶复阻抗的影响及其规律。
[Abstract]:Based on the multi-circle plane strain model of complex stiffness transfer, the longitudinal vibration of wedge-shaped pile in layered foundation considering soil compaction around piles is studied. Firstly, according to the longitudinal stratification of soil around the pile and considering the variable cross-section characteristics of the wedge pile, the pile-soil system is divided into finite micro-element segments along the longitudinal direction, and the multi-circle plane strain model of complex stiffness transfer is established for the soil around each micro-element section. The shear complex stiffness of the soil around the pile in the pile body is obtained by the recursive method of shear complex stiffness. Then the shear complex stiffness is substituted into the longitudinal vibration control equation of the pile body, and the Laplace transform technique and the impedance function recursive method are used. The analytical solution of the complex impedance of the pile top when the longitudinal vibration of the wedge-shaped pile in the layered foundation is taken into account when the soil compaction around the pile is considered is derived. Finally, the influence of soil squeezing effect on the complex impedance of pile top and its regularity are analyzed in the low frequency range by using the parameter study method.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金青年项目(51309207) 中国博士后科学基金特别项目(2013T60759);中国博士后科学基金面上项目(2012M521495) 中央高校基本科研业务费专项资金摇蓝计划项目(CUGL150411)
【分类号】：TU473.1

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