The surface waves induced by the motion of high speed trains (HST) have been theoretically and experimentally investigated in the literature. These works mostly focus on the trans-Rayleigh regime (the most hazardous situation) in the vicinity of the train. In contrast, for this paper, HST is assumed to generate surface waves in far field within the sub-Rayleigh regime. This paper aims at using the Rayleigh waves which travel in the front of high speed trains (HST) to detect underground cavities within a silty ground. First, computer results show that subsurface cavities provide a filtering effect on the spectra of Rayleigh waves within a wavelength range in relation with the depth of the cavity. Then, seismic data have been collected at the front of the HST on a specific test-site. They show a 3 to 6 dB magnitude variation on the power spectra in the vicinity of the cavity axis for the wavelengths ranging from 8 to 20 meters. A similar result has been observed from the background noise but affecting larger wavelengths.
High-speed train motion-induced Rayleigh waves applied to the detection of subsurface cavities
Bewegungsinduzierte Rayleighwellen an Hochgeschwindigkeitszügen zum Nachweis von Hohlräumen unter der Oberfläche
2009
6 Seiten, 6 Bilder, 1 Tabelle, 13 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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