Collapse%20of%20tunnels:%20soil-structure%20interaction%20failures

1
Collapse of tunnels soil-structure interaction
failures

• Professor Robert Mair
• Cambridge University Engineering Department

2
Tunnelling with shield and rings.
3
New Austrian tunnelling method. Sprayed concrete
lining onto unsupported walls.
4
(No Transcript)
5
(No Transcript)
6
Conclusions

• Tunnel collapses usually catastrophic
• Soil-structure interaction important in tunnel
  lining design time-dependent soil pressures
  depend on stiffness of lining
• Shape is critical horseshoe tunnel lining
  vulnerable to structural failure Toulon
• Sprayed concrete vulnerable to construction
  defects in lining eventual instability
  Heathrow