Prediction of the isolation efficiency of vibration countermeasures for a double-deck tunnel
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Document typeConference report
PublisherSociedade Portuguesa de Acústica
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Double-deck tunnels are an innovative tunnel design that has been recently implemented in some underground railways and metro lines worldwide. However, due to the complexity of this type of structures, its dynamic response has not yet been fully comprehended. This lack of understanding complicates the design of efficient vibration isolation countermeasures for them. Therefore, proper models for predicting the vibration impact of double-deck tunnels are highly needed. The aim of this paper is to present, on the one hand, an efficient model of a railway superstructure implemented in a double-deck tunnel and, on the other, to study how the vibration impact of this structure is affected by the addition of an elastomeric mat between the interior floor-tunnel contact and by modifications of the rail pads stiffness and damping values. In both cases, the results are presented in terms of the energy flow radiated upwards by the structure when harmonic moving loads circulate along the rails.
CitationClot, A., Arcos, R., Romeu, J., Noori, B. Prediction of the isolation efficiency of vibration countermeasures for a double-deck tunnel. A: Congreso Ibérico de Acústica y Congreso Español de Acústica. "EuroRegio 2016: June 13-15, 2016, Porto, Portugal: 9th Iberian Acoustics Congress; 47th Spanish Congress on Acoustics. Tecniacústica 2016". Porto: Sociedade Portuguesa de Acústica, 2016.