High-Speed Railway Tracks of a Surface, Bridge and Tunnel Line and Some Effects on the Train-Induced Bridge and Ground Vibrations

Abstract eng:
Different high-speed railway tracks have been analysed theoretically and experimentally, a ballasted track at a surface line, a slab track in a tunnel, and a ballasted track on a concrete bridge. Vehicle, track and ground vibration as well as their interaction are considered in a combined finite-element boundary-element (FEBEM) approach. The layered soil is calculated in frequency wavenumber domain and the solution for fixed or moving point or track loads follow as wavenumber integrals. The comparison of the dynamic compliances of the different tracks leads to an improved understanding of the different track elements. Certain maxima have been observed for certain train speeds and certain eigenmodes of the bridge. These maxima correlate with some maxima of the ground vibrations. The bridge and the ground vibrations are discussed with the axle-sequence of the train. The ground vibrations strongly depend on the regular and random inhomogeneity of the soil. The regular layering of the soil yields a cut-on and resonance phenomenon whereas the random inhomogeneity yields a scattering of the axle impulses which proved to be important for highspeed trains. All theoretical results are compared with measurements at a high-speed line.

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