Techniques for measuring the propagation speed of vibration waves in the ground

摘要

Characterizing the transmission of ground vibration is important for assessing impactsrnupon buildings located adjacent to a rail right-of-way. This type ground borne vibrationrntransmission is typically dominated by surface or “Rayleigh” waves. When predictingrnthe impacts, it is helpful to understand the attenuation of vibration from one location tornanother along the surface of the ground. In many cases, measuring the time-averagedrnrms vibration at spaced locations away from a line source is sufficient if one wishes onlyrnto quantify the reduction in ground borne energy density. For other purposes, however,rnit is essential to know the speed (and length) of the propagating wave.