Analytical solution for seismic response of composite tunnel liners with arbitrary section shape and embedded with an isolation layer

Gong Chen, Haitao Yu

Research output: Contribution to journalArticlepeer-review

Abstract

Isolation interlayer is a potential seismic mitigation measure for mountain tunnels, where a coating layer is installed between the initial support and the secondary liner. However, existing analytical solutions for the seismic response of tunnels with an isolation layer are primarily focused on circular tunnels with a single liner, thereby limiting their applicability for rock tunnels. In this paper, a novel analytical solution is proposed for deep tunnels with an arbitrary cross-section and an isolation interlayer subjected to seismic loading. The ground and the initial support, as well as the isolation interlayer and the secondary liner are assumed to be homogenous isotropic linear elastic. The analytical solution is derived using complex function theory and conformal mapping method. The verification of the solution is performed by comparing the stresses in the tunnel structure obtained by the proposed solution and those from FEM. The impact of the isolation interlayer on the seismic response of the initial support and the secondary liner is discussed. Parametric analyses are also conducted to investigate the influence of the thickness of the isolation interlayer and the cross-section shape on the seismic isolation effect of the interlayer.

Original languageEnglish
Article number105821
JournalTunnelling and Underground Space Technology
Volume150
DOIs
StatePublished - Aug 2024
Externally publishedYes

Keywords

  • Analytical solution
  • Arbitrary cross-section
  • Deep tunnel
  • Isolation interlayer
  • Seismic response

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