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Cailler.org Engineering Forum Index  Quiz Statistics 
 Tunnelling 
After reading the question, select the correct answer beside it!
When should I use a Tunnel Boring Machine    When I have a bad unstable geology
   When I have abrasive hard rock
   When I have a long tunnel in stable geology
   When I have to often cross soil/rock with water pressure
How to react to high tunnel deformations in deep tunnels    I can over-excavate and leave the tunnel to fully deform
   I immediately place a thick lining to stop all deformations
   I leave it to deform a while and protect against local collapses
   I move out for some weeks and then re-excavate
How I know when I am in danger    It smells like roten eggs and ventilation is down
   I have water up to my legs
   The tunnel is not lined or supported
   I hear cracking noises around me but no cracks are visible
Drilling and blasting to excavate a tunnel is    safer when not in urban regions
   quicker than a Tunnel Boring Machine
   safer than a Tunnel Boring Machine
   dangerous and an old fashion tunnelling method
Tunnels are    cheaper than buiding equivalent bridges
   based on a very theoretical science
   limited by length due to excavation logistics
   mostly earthquake proof
  



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