<p>Rising demands of Mass Rapid Transition due to urbanization and growing population are the drivers for newer and sustainable transport infrastructure. As options above ground become limited, a frequently adopted solution is to relocate more of the transport infrastructure below the surface through the construction of tunnels and underground stations. Construction of tunnels is challenging due to the variation in the topography, geology, and already present infrastructure, especially in the brownfield areas. Metro tunnel in urban areas is typically built at shallow depths, making them susceptible to localized stresses and seismic loading. Consequently, there is a necessity for research to understand how tunnels respond to the combined effects of both static and dynamic loading, ensuring their long-term stability. The present study covers all three components (a) Stresses and settlement during tunnel construction (b) Changes due to the construction of superstructure above the tunnel and (c) Dynamic response of constructed underground system against seismic loading. This study assesses the surface settlement resulting from the construction of twin tunnels through small-scale laboratory experiments further followed by detailed numerical analysis. Finite element analysis has been carried out for the twin tunnel model to analyze probable load from the superstructure as well as due to seismic loading. The results included stresses and displacements at the tunnel crown, invert, and springer, along with the shear forces and bending moments developed in the tunnel lining. An increase in horizontal seismic acceleration from 0.05 to 0.25<i>g</i> results in an approximate 30% average increase in stresses.</p>

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Comprehensive study of twin tunnel-soil-structure interaction: geostatic, superstructure, and seismic effects

  • Anas Ansari,
  • Md. Rehan Sadique,
  • Ibraheem Rais,
  • Mohd. Masroor Alam

摘要

Rising demands of Mass Rapid Transition due to urbanization and growing population are the drivers for newer and sustainable transport infrastructure. As options above ground become limited, a frequently adopted solution is to relocate more of the transport infrastructure below the surface through the construction of tunnels and underground stations. Construction of tunnels is challenging due to the variation in the topography, geology, and already present infrastructure, especially in the brownfield areas. Metro tunnel in urban areas is typically built at shallow depths, making them susceptible to localized stresses and seismic loading. Consequently, there is a necessity for research to understand how tunnels respond to the combined effects of both static and dynamic loading, ensuring their long-term stability. The present study covers all three components (a) Stresses and settlement during tunnel construction (b) Changes due to the construction of superstructure above the tunnel and (c) Dynamic response of constructed underground system against seismic loading. This study assesses the surface settlement resulting from the construction of twin tunnels through small-scale laboratory experiments further followed by detailed numerical analysis. Finite element analysis has been carried out for the twin tunnel model to analyze probable load from the superstructure as well as due to seismic loading. The results included stresses and displacements at the tunnel crown, invert, and springer, along with the shear forces and bending moments developed in the tunnel lining. An increase in horizontal seismic acceleration from 0.05 to 0.25g results in an approximate 30% average increase in stresses.