地铁交通引起环境振动传递特性试验研究

摘要

The problem of metro-induced environmental vibrations has attracted more and more concern recently . Precise prediction of metro-induced environmental vibrations in the frequency domain is a difficult problem to be solved .In this paper ,by hammer tests in the laboratory and numerical simulations ,the transfer characteristics of the tunnel-soil/building vibration propagation system were studied with vibration sources of different charac-teristics .The results show as follows :The transfer rate function of the tunnel-soil/building system is an inher-ent characteristics of the transfer system ,w hich is independent of the amplitude and the amplitude-frequency of the vibration source ;the transfer rate function of tunnel-soil system induced by metro train can be represented by the transfer rate function of tunnel-soil system induced by hammering at multi-point ;the prediction method based on the transfer rate function in hammer experiment can be used to precisely and quantitatively predict metro-induced environmental vibration responses in the time domain and the frequency domain.%地铁运营引起的环境振动问题越来越受到人们的关注，如何在频域内准确预测地铁交通引起的环境振动特性是一个亟待解决的难题；通过实验室锤击激励试验和数值模拟试验，对不同振源特性下隧道-地层-建筑物振动传播体系的传递特性进行研究。结果表明：隧道-地层/建筑物体系的传递率函数是传递系统的固有特性，与振源的幅值大小、幅频特性等因素无关；可以采用多点锤击激励激起的隧道-地层体系的传递率函数代替地铁列车运行引起的隧道-地层体系的传递率函数；基于锤击激励试验的地铁环境振动响应传递率函数预测方法可以实现时域和频域内准确定量预测地铁交通引起的环境振动响应。