Summary
This paper presents the experimental validation of a numerical model for the prediction of subway induced vibrations. The model fully accounts for the dynamic interaction between the train, the track, the tunnel and the soil. The periodicity or invariance of the tunnel and the soil in the longitudinal direction is exploited using the Floquet transformation, which allows for an efficient formulation in the frequency-wavenumber domain. A general analytical formulation is used to compute the response of three-dimensional invariant or periodic media that are excited by moving loads.
The numerical model is validated by means of several experiments that have been performed at a site in Regent’s Park on the Bakerloo line of London Underground. Vibration measurements have been performed on the axle boxes of the train, on the rail, the tunnel invert and the tunnel wall, and in the free field, both at the surface and at a depth of 15 m. Prior to these vibration measurements, the dynamic soil characteristics and the track characteristics have been determined. The Bakerloo line tunnel of London Underground has been modelled using the coupled periodic FE-BE approach and free field vibrations due to the passage of a train have been predicted and compared to the measurements.
The correspondence between the predicted and measured response in the tunnel and in the free field is reasonably good, given the large amount of uncertainties involved.
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Gupta, S., Degrande, G., Lombaert, G. (2008). Experimental Validation of a Numerical Model for Subway Induced Vibrations. In: Schulte-Werning, B., et al. Noise and Vibration Mitigation for Rail Transportation Systems. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 99. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-74893-9_15
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DOI: https://doi.org/10.1007/978-3-540-74893-9_15
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