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Study on Seismic Response and Damping Performance of Tunnels with Double Shock Absorption Layer

  • Tunnel Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

Shock absorption layer is an effective measure to decrease damage of tunnels under earthquake. According to previous work, the smaller stiffness of damping material, the better damping effect of the tunnel. In order to meet the actual engineering requirements, the shock absorption layer is applied to the upper part of tunnels (not including the invert), which is called a local shock absorption layer. This study is to analyze the damping effect of different types of local shock absorption layers based on the dynamic nonlinear time-history numerical analysis. Six real ground motions with different dominant frequencies are selected, their peak ground accelerations (PGA) are set to 0.2 g, 0.4 g, 0.6 g, and 0.8 g, respectively. The damage index and total dissipated energy of secondary lining, and equivalent plastic strain of surrounding rock are used as indicators to reflect the damping performance of the local shock absorption layer. Numerical results highlight that the damping performance with double local shock absorption layer is the best, and the damping performance of shock absorption layer under large earthquake is better than that under small earthquake.

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Acknowledgments

This research project was supported by research project on science and technology of Tibet Autonomous Region, China (Grant No. XZ201801-GB-07) and Natural Science Foundation of Heilongjiang (Grant No. YQ2019E021). The financial supports are greatly appreciated by the authors.

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Correspondence to Shuang Li.

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Zhou, T., Dong, C., Fu, Z. et al. Study on Seismic Response and Damping Performance of Tunnels with Double Shock Absorption Layer. KSCE J Civ Eng 26, 2490–2508 (2022). https://doi.org/10.1007/s12205-022-1862-y

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  • DOI: https://doi.org/10.1007/s12205-022-1862-y

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