Prediction of railway ground vibrations: Accuracy of a coupled lumped mass model for representing the track/soil interaction |
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| Institution: | 1. Institute of Sound and Vibration Research, University of Southampton, Southampton, SO17 1BJ, UK;2. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, B-3001 Leuven, Belgium;1. University of Porto, Faculty of Engineering, Porto, Portugal;2. School of Engineering of the Polytechnic Institute of Porto, Porto, Portugal;1. University of Mons—UMONS, Faculty of Engineering, Department of Theoretical Mechanics, Dynamics and Vibrations, Place du Parc 20, B-7000 Mons, Belgium;2. Heriot-Watt University, School of Energy, Geoscience, Infrastructure & Society, Edinburgh EH14 4AS, United Kingdom;3. University of Thessaly, School of the Civil Engineering, Pedion Areos, 383 34 Volos, Greece;1. School of Civil, Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia;2. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia;3. School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia;4. Geoharbour Australia Pty Ltd, Melbourne, VIC 3000, Australia |
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| Abstract: | Recent advances in railway-induced ground vibrations showed that the track/soil interaction plays an important role in the low frequency range. This paper contributes to the numerical analysis of train/track/foundation dynamics by presenting the accuracy of a coupled lumped mass (CLM) model devoted to the railway foundations and to the track/soil coupling. Following a summary of the background and the advantages of the CLM model, the coupling strategy is quantified through two application cases. Firstly, the dynamic track deflection is calculated for different railway lines considering various degrees of complexities of foundations. Then, the foundation responses are compared depending on whether detailed coupling is introduced or not. The benefit of the proposed model is emphasized by presenting free-field ground vibration responses generated by a tram and a high-speed train, obtained by a revisited two-step prediction model developed by the authors. |
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| Keywords: | Railway ground vibrations Track/soil interaction CLM model Multibody approach Finite element modelling Coupling strategy |
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