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<p>In northwest China’s Loess region, large-scale mountain-moving projects are implemented to address the shortage of land for urban development. This has led to the increasing use of High-Fill Cut-and-Cover Tunnels (HFCCTs) in the region. However, the large amount of backfill material above Cut-and-Cover Tunnels (CCTs) poses significant threats to the structural integrity of the tunnels and to the safety of vehicular operations. Moreover, the Loess region is located in a seismically active zone, where frequent earthquakes further compromise the safety and stability of HFCCTs. In this study, a three-dimensional numerical simulation model was developed using the finite difference software FLAC3D to investigate the effectiveness of various load reduction methods for HFCCTs under both static and seismic loads. The results show that placing expanded polystyrene (EPS) on the top and sides of the CCT, combined with concrete wedges on both sides of the slope, can significantly reduce the earth pressure around the CCT under both static and seismic loads. This method also mitigates seismic disturbances to the soil arch and greatly reduces the internal forces and deformations of the CCT. Compared with the case without load reduction measures, the bending moments decreased by up to 66.99%, while the deformation was reduced by 59.96%.</p>

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Soil Arch Shape Change and Dynamic Response of Lining Structure for High Fill Cut-and-Cover Tunnel Under Seismic Loads

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Zhugang You,
  • Jintang You,
  • Hao Lei,
  • Hongyu Zhang

摘要

In northwest China’s Loess region, large-scale mountain-moving projects are implemented to address the shortage of land for urban development. This has led to the increasing use of High-Fill Cut-and-Cover Tunnels (HFCCTs) in the region. However, the large amount of backfill material above Cut-and-Cover Tunnels (CCTs) poses significant threats to the structural integrity of the tunnels and to the safety of vehicular operations. Moreover, the Loess region is located in a seismically active zone, where frequent earthquakes further compromise the safety and stability of HFCCTs. In this study, a three-dimensional numerical simulation model was developed using the finite difference software FLAC3D to investigate the effectiveness of various load reduction methods for HFCCTs under both static and seismic loads. The results show that placing expanded polystyrene (EPS) on the top and sides of the CCT, combined with concrete wedges on both sides of the slope, can significantly reduce the earth pressure around the CCT under both static and seismic loads. This method also mitigates seismic disturbances to the soil arch and greatly reduces the internal forces and deformations of the CCT. Compared with the case without load reduction measures, the bending moments decreased by up to 66.99%, while the deformation was reduced by 59.96%.