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<p>This study numerically investigated the response of a tunnel lining protected by an isolation layer under fault movement and earthquake excitation. Two different densities of Expanded PolyStyrene geofoam and three polymer types (natural, nitrile, and neoprene rubbers) were used as the isolation materials. Three fault dip angles (30°, 60°, and 90°) were considered in this study. The results indicated that the isolation layer significantly reduced the bending moment in the lining, with a 96.88% reduction for a 30° dip angle and a 61.84% reduction for a 90° dip angle. The isolation layer also distributes the axial force in the longitudinal direction of the lining, reducing the peak axial force by up to 93%. The peak deformation in the lining decreased by 40% for the dip angle of 30°, whereas no significant change was observed for the other dip angles. Under earthquake excitation, the isolation layer amplified the acceleration in the lining at the intersection between the footwall and the fault; however, it reduced the structural forces in other areas. These findings confirm that geofoam with a higher density showed good performance during seismic excitation, whereas geofoam with a lower density performed well under fault movement compared to polymers.</p>

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Investigation on Failure Analysis of Tunnel Lining Covered with Isolation Layer Under Fault Movement and Earthquake Excitation

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Venkataraman Jayakumar,
  • Joseph Antony Visuvasam

摘要

This study numerically investigated the response of a tunnel lining protected by an isolation layer under fault movement and earthquake excitation. Two different densities of Expanded PolyStyrene geofoam and three polymer types (natural, nitrile, and neoprene rubbers) were used as the isolation materials. Three fault dip angles (30°, 60°, and 90°) were considered in this study. The results indicated that the isolation layer significantly reduced the bending moment in the lining, with a 96.88% reduction for a 30° dip angle and a 61.84% reduction for a 90° dip angle. The isolation layer also distributes the axial force in the longitudinal direction of the lining, reducing the peak axial force by up to 93%. The peak deformation in the lining decreased by 40% for the dip angle of 30°, whereas no significant change was observed for the other dip angles. Under earthquake excitation, the isolation layer amplified the acceleration in the lining at the intersection between the footwall and the fault; however, it reduced the structural forces in other areas. These findings confirm that geofoam with a higher density showed good performance during seismic excitation, whereas geofoam with a lower density performed well under fault movement compared to polymers.