STUDY ON ENVIRONMENTAL VIBRATION INDUCED BY UNDERGROUND RAILWAY

The environment vibration reduced by subway was in situ measured in Shanghai, by which the time-histories of three dimensions acceleration were obtained. Then FFT method is used to convert the time histories into frequency spectrums which offer us to get the propagation rule and vibration level with 1/3octave frequency criterion. The results show that 40-80Hz is the excellent frequency of ground vibrations induced by Subway. Meanwhile vertical vibration is much more violent than horizontal one, so vertical vibration could be only taken into account when we study the environmental problem induced by underground railway. Furthermore vibration level near underground line is beyond the limit value defined by Chinese Environment Code GB10070-88.