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Earthquakes and Structures
  Volume 26, Number 5, May 2024 , pages 327-336

Capacity-spectrum push-over analysis of rock-lining interaction model for seismic evaluation of tunnels
Sina Majidian, Serkan Tapkin and Emre Tercan

    Evaluation of tunnel performance in seismic-prone areas demands efficient means of estimating performance at different hazard levels. The present study introduces an innovative push-over analysis approach which employs the standard earthquake spectrum to simulate the performance of a tunnel. The numerical simulation has taken into account the lining and surrounding rock to calculate the rock-tunnel interaction subjected to a static push-over displacement regime. Elastic perfectly plastic models for the lining and hardening strain rock medium were used to portray the development of plastic hinges, nonlinear deformation, and performance of the tunnel structure. Separately using a computational algorithm, the non-linear response spectrum was approximated from the average shear strain of the rock model. A NATM tunnel in Turkey was chosen for parametric study. A seismic performance curve and two performance thresholds are introduced that are based on the proposed nonlinear seismic static loading approach and the formation of plastic hinges. The tunnel model was also subjected to a harmonic excitation with a smooth response spectrum and different amplitudes in the fully-dynamic phase to assess the accuracy of the approach. The parametric study investigated the effects of the lining stiffness and capacity and soil stiffness on the seismic performance of the tunnel.
Key Words
    earthquake spectrum; nonlinear static analysis; rock; seismic performance; tunnel
Sina Majidian: Department of Civil Engineering, University of Science and Technology of Mazandaran, Behshahr, Iran
Serkan Tapkin: Department of Civil Engineering, Faculty of Engineering, Bayburt University, 69010, Bayburt, Turkey
Emre Tercan: General Directorate of Highways, 13th Region, Department of Traffic Safety, 07090, Antalya, Turkey

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