摘要
根据B iot饱和土理论和R ay le igh-Love杆理论,计及土层及桩的径向运动影响,导出了考虑横向惯性效应的端承桩与饱和土的纵向耦合振动频域的解析解和时域半解析解,对比了考虑与不考虑横向惯性效应时,大直径嵌岩桩纵向振动引起的土层复阻抗的异同以及桩顶导纳和时域反射的特征。研究表明:长径比越小,横向惯性效应越明显,而泊松比和激振频率对饱和土层阻抗及桩顶响应也有重要影响。通过工程实例对比表明,当桩的长径比较小时,用考虑横向惯性效应的计算方法可以得到更好的拟合效果。
Based on the theory of saturated soil presented by Blot and the theory of Rayleigh-Love bar, the coupled longitudinal vibration of a large diameter end-bearing pile in saturated soil is investigated by considering transverse inertial effect. The analytical solutions in frequency domain and semi-analytical solutions in time domain are derived by applying the method of variable separation. For the complex resistance factor of saturated soil that is caused by pile vertical vibrations, the differences between the two cases, in which the transverse inertial effect is considered or not, are illustrated as well as the dynamic responses at pile head. The results show that the transverse inertial effects of pile increase with the decreasing slenderness. And Poisson＇s ratio and exciting frequency have also vital influence on soil complex resistance factor and pile dynamic responses. Furthmore, it indicates that the present method are more appropriate than the former one for a pile with the smaller slen- derness by comparing with the field pile dynamic test.
出处
《振动工程学报》
EI
CSCD
北大核心
2005年第4期500-505,共6页
Journal of Vibration Engineering
基金
国家自然科学基金资助(50279047)
浙江省教育厅2005年度科研计划项目(20050111)
关键词
饱和土
纵向振动
横向惯性效应
复阻抗
saturated soil
longitudinal vibration
transverse inertial effect
complex resistance
