考虑横向惯性下桩的纵向振动理论解和数值解对比分析

发布时间：2018-04-11 05:33

  本文选题：横向惯性 + 扩散虚土桩　； 参考：《岩土力学》2017年09期

【摘要】：考虑桩身的横向惯性效应和桩端土应力扩散效应,进行了成层土桩的纵向振动研究。在桩-土模型中,将桩身等效为Rayleigh-Love杆,桩端土对桩身的支承作用简化为扩散虚土桩模型,采用平面应变模型来描述桩与桩侧土的相互作用。结合初始条件、边界条件和连续条件,并通过积分变换法和阻抗函数递推法,得到半正弦激振脉冲作用下桩顶的动力响应理论解。建立桩-土系统的有限元模型,进行数值计算。分别利用理论解和数值解分析脉冲宽度、桩径、虚土桩桩长和桩侧土夹层等相关参数对桩顶速度时域曲线的影响,并得出了两种方法的对比结果,互相验证了所建模型的正确性。
[Abstract]:The longitudinal vibration of layered soil pile was studied by considering the lateral inertia effect of pile body and the stress diffusion effect of soil at the end of the pile.In the pile-soil model, the pile body is equivalent to the Rayleigh-Love rod, and the supporting action of the pile end soil to the pile body is simplified as the diffusion fictitious soil pile model. The plane strain model is used to describe the interaction between the pile and the pile-side soil.Combined with initial condition, boundary condition and continuous condition, the theoretical solution of dynamic response of pile top under the action of half-sinusoidal vibration pulse is obtained by means of integral transformation method and impedance function recursive method.The finite element model of pile-soil system is established and the numerical calculation is carried out.The effects of the parameters such as pulse width, pile diameter, pile length and soil intercalation on the time-domain velocity curves of the pile are analyzed by theoretical and numerical solutions, and the results of comparison between the two methods are obtained.The correctness of the model is verified by each other.
【作者单位】： 苏州科技大学土木工程学院;
【基金】：国家自然科学基金项目(No.51508369) 江苏省自然科学基金项目(No.BK20150289)~~
【分类号】：TU473.1
，

本文编号：1734665