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The tunnels constitute a vital component of the modern infrastructure, serving as conduits for transportation, utilities, and other purposes. Rectangular-shaped tunnels, also referred to as box type structures, are often constructed as vehicular tunnels due to their spacious geometry. However, tunnels undergo significant stresses, and their structural integrity may be compromised under dynamic loading conditions. Therefore, it is essential to consider earthquake events in tunnel analysis to guarantee safety and stability of these structures. Moreover, tunnels which are situated in the areas prone to liquefaction, are subjected to additional complexities. This study includes a comprehensive investigation of deformation behaviour of shallow rectangular tunnel in saturated sands using a fully non-linear plane strain analysis implemented through the finite element programme PLAXIS 2D. The seismic response of the rectangular tunnel and its interaction with the soil is investigated under undrained loading conditions, using the advanced constitutive model PM4Sand that is able to capture the generation of excess pore water pressure during liquefaction, the post-liquefaction phenomena and soil dilatancy behaviour. The study aims to understand the intricate aspects of tunnel response in saturated conditions, including deformation patterns, amplification phenomena and pore water pressure variations. The numerical model for a rectangular tunnel is developed by validating the model with the centrifuge study of Miranda et al. [7]. Additionally, the ground water table is lowered by 10 m from the surface, and the resulting changes in lining forces and the deformation in soil-tunnel system were also observed. The findings indicate that the presence of a tunnel structure alters the site acceleration response and magnitude of excess pore pressure generation along with the vertical displacement of the structure. Therefore, this study highlights the complex interaction between the tunnel structures, seismic forces, and soil response. The findings obtained from this investigation offer essential guidance towards addressing crucial challenges associated with a shallow rectangular tunnel buried in saturated sand under seismic loading conditions.

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Deformation Response of Shallow Rectangular Tunnel Embedded in Saturated Sand Subjected to Seismic Loading

  • 会议论文

  • 发表日期：

    2025年

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  • Manisha Yadav,
  • Akanksha Tyagi,
  • Vishwas A. Sawant

摘要

The tunnels constitute a vital component of the modern infrastructure, serving as conduits for transportation, utilities, and other purposes. Rectangular-shaped tunnels, also referred to as box type structures, are often constructed as vehicular tunnels due to their spacious geometry. However, tunnels undergo significant stresses, and their structural integrity may be compromised under dynamic loading conditions. Therefore, it is essential to consider earthquake events in tunnel analysis to guarantee safety and stability of these structures. Moreover, tunnels which are situated in the areas prone to liquefaction, are subjected to additional complexities. This study includes a comprehensive investigation of deformation behaviour of shallow rectangular tunnel in saturated sands using a fully non-linear plane strain analysis implemented through the finite element programme PLAXIS 2D. The seismic response of the rectangular tunnel and its interaction with the soil is investigated under undrained loading conditions, using the advanced constitutive model PM4Sand that is able to capture the generation of excess pore water pressure during liquefaction, the post-liquefaction phenomena and soil dilatancy behaviour. The study aims to understand the intricate aspects of tunnel response in saturated conditions, including deformation patterns, amplification phenomena and pore water pressure variations. The numerical model for a rectangular tunnel is developed by validating the model with the centrifuge study of Miranda et al. [7]. Additionally, the ground water table is lowered by 10 m from the surface, and the resulting changes in lining forces and the deformation in soil-tunnel system were also observed. The findings indicate that the presence of a tunnel structure alters the site acceleration response and magnitude of excess pore pressure generation along with the vertical displacement of the structure. Therefore, this study highlights the complex interaction between the tunnel structures, seismic forces, and soil response. The findings obtained from this investigation offer essential guidance towards addressing crucial challenges associated with a shallow rectangular tunnel buried in saturated sand under seismic loading conditions.