Multistage Tunnel Excavation and Support

Software

Version Notes:
FLAC 8.0

Level: Intermediate
Runs in Demo: No

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FLAC simulates the four excavation stages and three construction steps within each stage for a multistage tunnel excavation and construction. The convergence-confinement method is used to simulate the effect of the tunnel advance. A ground reaction curve is calculated to relate the effect of the advancing tunnel face to reduction in internal pressure within the excavated region. Both rockbolt support and a shotcrete liner are installed at different stages of the tunnel advance.

Keywords:

  • Multistage excavation
  • shallow tunnel
  • rockbolts
  • Shortcrete
  • Ground reaction curve
  • Mohr-Coulomb model

Materials:

  • Concrete
  • Rock
  • Steel

Analyses:

  • Static
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