径向多圈层桩-土耦合振动模型研究  

A Study of Vertical Vibration of Pile in Radial Heterogeneous Soil

作　　者：薛国强[1] 张琳 周燕 

机构地区：[1]常熟理工学院管理学院,江苏常熟215500 [2]常熟中法水务有限公司,江苏常熟215500 [3]常熟市住房和城乡建设局,江苏常熟215500

出　　处：《常熟理工学院学报》2013年第2期65-71,78,共8页Journal of Changshu Institute of Technology

基　　金：常熟市科技发展计划(社会发展)项目"河道淤泥在常熟地区市政工程中的应用研究"(CS201109)

摘　　要：研究了径向非均质土与弹性支承桩耦合振动模型,假设桩为线弹性等截面体,桩周土体沿径向分为三个圈层,每圈层内土体均为线性粘弹性体,其材料阻尼为滞回阻尼.首先分别建立三圈土体动力平衡方程,并由外而内进行求解,利用边界条件和每圈土体之间接触面上位移和应力连续条件,求得了每圈土体振动的位移解,接着考虑桩-土耦合作用,建立桩的动力平衡方程,进而求解方程,得到了桩顶的频域响应解析解和时域响应半解析解,最后将本文解与前人成果进行了对比分析,证明了本文解的正确性.This paper makes a study of the pile-soil interaction model in radially heterogeneous soil, assuming the pile is vertical, elastic, uniform, and of circular cross-section. Moreover, it rests on elastic support and is subjected to vertical harmonic load. In addition, the soil around the pile is divided into three zones along the ra-dial orientation, which are considered as linear viscoelastic media with hysteretic type damping and rest on elas-tic support as well. First, the paper gives the dynamic equilibrium equations of three zones soil and solves the equations one by one. Then, the paper considers the interaction condition, constructs the equilibrium equation of pile, solves it, and gets some analytical or semi-analytical dynamic responses on the pile top in frequency do-main and time domain. Finally, from contrasting to the previous results, the paper proves that the present solu-tion is correct.

关 键 词：桩土耦合作用 径向非均质 复刚度 解析解 纵向振动 

分 类 号：U416.1[交通运输工程—道路与铁道工程]