摘要
城市轨道交通和高速铁路的发展,加剧了列车运行引起的环境振动。该文对CRTSI型板式无碴轨列车运行引起的竖向振动进行了研究,基于有限元模型分析了竖向振动在土体中传播规律。竖向振动的频率集中在10～120Hz之间,它和主频、振级都随着距离振源距离的增大不断减小,并且随振动的不断传播,高频成分迅速衰减;竖向加速度峰值随着深度的增加有减小的趋势,加速度峰值衰减的幅度在距离轨道较近时更加明显。
With the development of urban traffic and high speed railway,environmental vibration caused by train running is accelerated.Vertical vibration by ballastless track train of CRIS I is studied and the travel rule is analyzed with finite element model.The results show that when the vertical vibration frequency is within 10-120Hz,the vibration,dominant frequency and vibration level decrease with the increase of the vibration source distance and high frequency component immediately reduce with the continuously travel of vibration.The peak value of vertical accelerated speed demonstrates the trend of reduction with the increase of depth and the reduction range of accelerated speed is more obvious in comparatively close track distance.
出处
《重庆建筑》
2013年第7期10-15,共6页
Chongqing Architecture
基金
教育部中央高校基本科研业务费专项资金资助项目(项目编号CDJRC10200002)
重庆市科委自然科学基金计划资助项目(项目编号2010BB9207)的论文之一
关键词
地面振动
无碴轨
有限元
边界元耦合法
位移边界元法
环境振动
应力波传播
弹性极限
ground vibration
ballastless track
finite element
boundary element coupling method
displacement boundary element method
environment vibration
stress wave travel
elastic limit
