隧道内脉冲激励下地层振动传递特性研究  

Stratum vibration transfer characteristic under pulse excitations inside a tunnel

作　　者：王文斌[1] 刘维宁[2] 孙宁[1] 李克飞[2] 聂志理[2] 

机构地区：[1]中国铁道科学研究院工程咨询有限公司,北京100081 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《振动与冲击》2013年第8期162-165,198,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51008017);北京交通大学优秀博士生创新基金(2011YJS261)

摘　　要：目前,对于地铁运营引起的振动在地层中的传递特性一直未有系统深入的研究。利用自动落锤激励装置锤击轨道减振与控制实验室10 m埋深隧道内轨道,研究了0～200 Hz频段振动加速度在地层中的传播衰减特性。试验结果表明:①隧道结构-地面振动加速度峰值衰减率达到81.25%,地层对振动有很强的衰减作用。②除了30 Hz附近频段传递函数幅值大于1,隧道结构到地面振动响应传递函数幅值普遍小于0.4。③隧道结构-地面1/3倍频程加速度级传递损失曲线呈V形分布,传递损失在30 Hz附近最小,且为负值,此频段振动加速度能量从隧道传递到地面有放大现象。At present, there is no systematic study on the transfer characteristic of stratum vibration induced by metro operations. The stratum vibration transfer characteristic tests were performed in a lab. of track vibration abatement ＆ control by using an automatic falling weight system to impact an underground track inside a tunnel. The propagation attenuation characteristics of vibration accelerations in the stratum were studied in a frequency range of 0 - 200 Hz. The results indicated that （1） the attenuation rate of the acceleration peak value from the tunnel to the ground surface can reach 81.25% and the strata have a strong attenuation function; （2） the transfer function amplitude of the vibration responses reveals a V-shape distribution, the transmission loss is the least near 30Hz and is a negative value at this frequency band ; the vibration acceleration energy from the tunnel to the ground surface is amplified.

关 键 词：脉冲试验 自动落锤激励装置 传递损失 振动响应传递函数 相干系数 

分 类 号：TH131.3[机械工程—机械制造及自动化]