全部

力学与实践 ›› 2009, Vol. 31 ›› Issue (3): 57-60.doi: 10.6052/1000-0879-2008-336

• 应用研究 • 上一篇    下一篇

三维轴对称基桩动力特性研究

刘宝臣 王杰光   

  1. 中国地质大学(武汉)工程学院,武汉 430074 桂林工学院土木系岩土工程教研室 541004
  • 收稿日期:2008-07-02 修回日期:2008-07-31 出版日期:2009-06-08 发布日期:2009-06-08

DYNAMIC PROPERTIES OF PILES IN AXIS-SYMMETRY MODEL

  • Received:2008-07-02 Revised:2008-07-31 Online:2009-06-08 Published:2009-06-08

摘要: 针对目前基桩动力特性研究中把桩视为一维杆件的缺陷,采用三维轴对称模型,对基桩的动 力响应进行了更深入研究,并与一维杆件模型结果进行了对比. 结果表明桩的长径比对桩振 动的固有频率有影响,只在不考虑桩的高阶固有频率时,把桩视为一维杆件进行计算分析是 可行的;若只考虑前四阶固有频率,则只要桩的长径比大于3即可;桩-土刚度对桩振动的 第一、二阶固有频率有较大的影响,提出了由第一、二阶固有频率反算求出桩-土刚度,进 而求出桩的承载力的方法.

关键词: 三维轴对称模型;桩基动力特性;固有频率;桩-土刚度

Abstract: To overcome the short coming in the studies on dynamic properties in which the pile is considered as a one-dimensional pole, this paper studies the dynamic properties of a pile in an axis-symmetry model. A comparison between the two models shows that the ratio of length to radius of the pile influences the eigenfrequencies of the pile. The pile can be analyzed in one dimensional model when eigenfrequencies of high order are neglected, or for the first four eigenfrequencies, the pile ratio of length to radius should be large than 3. Soil-pile stiffness has more influence on the first and second eigenfrequencies of the pile. A method is proposed to calculate soil-pile stiffness by an inverse method with the first and second eigenfrequencies of the pile, so the pile capacity can be computed.

Key words: axis-symmetry model, dynamic properties of pile, eigenfrequency, soil-pile stiffness