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<p>This study presents a novel investigation on the seismic performance of underground single and twin tunnels subjected to dynamic loading conditions, including high-speed train passage and earthquake ground motions. Finite element analysis is carried out, incorporating both linear dynamic and construction stage analyses to simulate realistic conditions. The influence of tunnel configuration and construction sequencing on seismic response is analyzed in depth. In conclusion, twin tunnel systems experience significantly higher stresses and displacements than single tunnels during earthquakes, making them more susceptible to damage during earthquakes. The twin tunnels show a maximum of 667.60 mm horizontal and 240.88 mm vertical translations, compared to 193.94 mm and 122.13 mm in single tunnels. The maximum shear stress in twin tunnels reaches 54.60<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\( kN/{m^2}\)</EquationSource> </InlineEquation> versus 28.98<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\( kN/{m^2}\)</EquationSource> </InlineEquation> in single tunnels, and von Mises stress is 536.77<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\( kN/{m^2}\)</EquationSource> </InlineEquation>in twin tunnels, more than seven times higher than the 69.62 <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(kN/{m^2}\)</EquationSource> </InlineEquation>in single tunnels. These values emphasize the need for robust seismic design strategies for twin tunnels.</p>

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Seismic performance assessment of single and twin tunnels subjected to earthquake and rail loads

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Avni Katariwala,
  • Twinsy Palsanawala,
  • Mohit Bhandari,
  • Atul Desai

摘要

This study presents a novel investigation on the seismic performance of underground single and twin tunnels subjected to dynamic loading conditions, including high-speed train passage and earthquake ground motions. Finite element analysis is carried out, incorporating both linear dynamic and construction stage analyses to simulate realistic conditions. The influence of tunnel configuration and construction sequencing on seismic response is analyzed in depth. In conclusion, twin tunnel systems experience significantly higher stresses and displacements than single tunnels during earthquakes, making them more susceptible to damage during earthquakes. The twin tunnels show a maximum of 667.60 mm horizontal and 240.88 mm vertical translations, compared to 193.94 mm and 122.13 mm in single tunnels. The maximum shear stress in twin tunnels reaches 54.60 \( kN/{m^2}\) versus 28.98 \( kN/{m^2}\) in single tunnels, and von Mises stress is 536.77 \( kN/{m^2}\) in twin tunnels, more than seven times higher than the 69.62 \(kN/{m^2}\) in single tunnels. These values emphasize the need for robust seismic design strategies for twin tunnels.