A numerical model for calculating vibration due to a harmonic moving load on a floating-slab track with discrete slabs in an underground railway tunnel

Hussein, M.F.M. and Hunt, H.E.M. (2009) A numerical model for calculating vibration due to a harmonic moving load on a floating-slab track with discrete slabs in an underground railway tunnel. Journal of Sound and Vibration, 321 (1-2), 363-374. (doi:10.1016/j.jsv.2008.09.023).

Record type: Article

Abstract

This paper presents a new method for modelling floating-slab tracks with discontinuous slabs in underground railway tunnels. The track is subjected to a harmonic load moving with a constant velocity. The model consists of two sub-models. The first is an infinite track with periodic double-beam unit formulated as a periodic infinite structure. The second is modelled with a new version of the Pipe-in-Pipe (PiP) model that accounts for a tunnel wall embedded in a half-space. The two sub-models are coupled by writing the force transmitted from the track to the tunnel as a continuous function using Fourier series representation and satisfying the compatibility condition.

The displacements at the free surface are calculated for a track with discontinuous slab and compared with those of a track with continuous slab. The results show that the far-field vibration can be significantly increased due to resonance frequencies of slabs for tracks with discontinuous slabs.

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