三维轴对称基桩动力特性研究  

DYNAMIC PROPERTIES OF PILES IN AXIS-SYMMETRY MODEL

作　　者：刘宝臣[1,2] 王杰光[1] 

机构地区：[1]桂林理工大学土木与建筑工程学院,桂林541004 [2]中国地质大学(武汉)工程学院,武汉430074

出　　处：《力学与实践》2009年第3期57-60,47,共5页Mechanics in Engineering

基　　金：广西建筑工程检测与试验重点实验室资助项目(桂科能07109005-05);广西自然科学基金资助项目(桂科自0728220);广西科学基金资助项目(桂科基0575097)

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.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.

关 键 词：三维轴对称模型 基桩动力特性 固有频率 桩-土刚度 

分 类 号：TU473.1[建筑科学—结构工程]