On the Surface Waves Retrieved from High-speed Trains Running on Viaducts and Ground Surface

Abstract

The high-speed train (HST) generates strong ground vibrations when it runs on the railroad. However, little attention has been paid to retrieving surface wave from these vibrations. Here, we try to retrieve surface waves from HST-induced vibrations using field data. There are two kinds of HST tracks, one is built on the viaduct and the other is built on the ground. We acquired the signals generated by the HST running on the two kinds of tracks in Huzhou, China. In the original noise records, the HST signals can be obviously observed. In terms of a single HST event, the signals generated by the HST on the ground surface decay quickly and the signals generated by the HST running on the viaduct have broadband energy. We calculated the noise crosscorrelations in the HST-induced segments and stacked the results. Surface-wave dispersion energy were generated and compared with the results from the segments without HST. A significant improvement of the retrieval of surface waves were observed with signals generated by the HST running on viaducts while less obviously when on the ground surface.