Effects of complex interaction of Rayleigh waves with tunnel on the free surface ground motion and the strain across the tunnel-lining

J. Narayan (), D. Kumar and D. Sahar ()

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2015, vol. 79, issue 1, 479-495

Abstract: The effects of complex interaction of Rayleigh waves with lined and unlined tunnels on the free surface ground motion and longitudinal and shear strains across the tunnel-lining are documented in this paper. The effects of depth and diameter of tunnel and the embedding sediment on the amplification and de-amplification of ground motion are studied in detail. The effects of depth of tunnel and the embedding sediment on the longitudinal and shear strains across the tunnel-lining are also studied in detail. The seismic responses of various tunnel models were simulated using a fourth-order accurate staggered-grid viscoelastic P–SV-wave finite-difference algorithm. The analyses of the simulated results reveal that the amplification/de-amplification caused by the tunnel increases with the decrease in depth of tunnel. Ground motion amplification was obtained between the source and the tunnel. An increase in amplification/de-amplification pattern with increase in S-wave velocity in the embedding sediment and the diameter of the tunnel for a fixed depth was obtained. It is concluded that the chances of failure of tunnel-lining due to strain may be just opposite side of the incoming Rayleigh wave in case of a shallow tunnel (>25 m deep) and at the top of the tunnel in case of deeper one (>25 m deep). Copyright Springer Science+Business Media Dordrecht 2015

Keywords: Tunnel effects on surface waves; Free surface amplifications; Effects of depth and diameter of tunnel; Strains and finite-difference simulation (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1007/s11069-015-1853-0

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