摘要
基于虚土桩和广义Voigt模型,建立桩及承台纵向振动的动力平衡方程,求得承台纵向振动时位移、速度的频域、时域解,研究了桩底土对既有承台单桩纵向振动特性的影响.结果表明:在相同初始位移条件下,单层桩底土厚度越大,承台位移、速度幅值及振动频率越小,而共振频率基本一致;存在软弱下卧层时,下卧层厚度越大、土质越差,承台位移、速度幅值越小.最后,通过与桩底土单Voigt模型及实际工程曲线对比发现,采用虚土桩模型能准确模拟软弱下卧层的作用,使得计算结果更为接近工程实测数据.
Based on fictitious soil pile and generalized Voigt model,dynamic equilibrium equations of pile and cushion cap were established in the vertical vibration,displacement and velocity solutions of cushion cap were obtained on frequency and time domain,and the influence of pile subsoil on the vertical dynamic characteristics of cushion cap was studied. The results show that under the same initial displacement condition,the deeper thickness of single layer pile subsoil results in the smaller displacement,velocity amplitude and vibration frequency of cushion cap,but the resonant frequency is the same. In the case of weak substratum,the deeper thickness of substratum and the worse substratum results in the smaller displacement and velocity amplitude of cushion cap. Finally,the comparison results with single Voigt model of pile subsoil and actual engineering curves show that fictitious soil pile model can accurately simulate the role of weak substratum and the calculation is more close to the measurements.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第11期170-176,共7页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51378464)~~
关键词
时域分析
虚土桩模型
广义Voigt模型
黏弹性桩
承台
纵向振动特性
拉氏变换
time domain analysis
fictitious soil pile model
general Voigt model
viscoelastic pile
cushion cap
vertical vibration characteristics
Laplace transforms
