摘要
针对传统隔振方法对低频振动无法取得较好效果的问题,分析了波阻块（WIB）和蜂窝形波阻块（HWIB）对高速铁路引发的低频振动的隔振效果.首先建立了列车-路基的数值计算模型,将列车荷载简化为沿路基向前的移动荷载列,并采用基于拉格朗日算法的有限差分软件计算了埋设WIB和HWIB前后场地土的振动情况,最后与空沟的隔振效果进行了比较.结果表明：对于高速铁路运行引发的低频振动,与无隔振措施相比,实体WIB和HWIB可分别使地表振级降低6~15dB和8~20 dB,特别是对于10 Hz以内的低频振动,HWIB能使振动幅值降低80%以上,是一种非常有效的隔振方式;在埋深不大时,空沟的隔振效果比HWIB要差得多.
As the traditional vibration isolation methods have no obvious effect on the low-frequency vibration,the wave-impeding block（WIB） and the honeycomb wave-impeding block（HWIB） are introduced in the isolation of low-frequency vibration induced by high-speed railway.In the investigation,first,a numerical model of train-subgrade is established,which simplifies the train loads as the dynamic loads moving along the subgrade.Then,the vibrations of the ground with and without WIB and HWIB are calculated by using the finite difference software based on Lagrange algorithm.Finally,the isolation effects of WIB and HWIB are compared with those of the open trench.The results show that,for the low-frequency vibration induced by high-speed railway,the application of WIB and HWIB enables the vibration level of ground surface to reduce by 6~15dB and 8~20dB,respectively.Especially,for the low-frequency vibration within 10Hz,the application of HWIB can reduce the vibration amplitude by more than 80%,which means that the proposed method is effective in vibration isolation.Moreover,it is also found that HWIB is superior to the open trench with shallow embedding in terms of vibration isolation.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第6期132-136,154,共6页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(10872075)
关键词
高速铁路
低频振动
隔振
波阻块
蜂窝形波阻块
空沟
high-speed railway
low-frequency vibration
vibration isolation
wave-impeding block
honeycomb wave-impeding block
open trench
