Notices
Results 1 to 9 of 9

Thread: tunnels in sand?

  1. #1 tunnels in sand? 
    Forum Freshman
    Join Date
    May 2008
    Location
    UK
    Posts
    45
    Had a thought, (strange i know!) would it be possible to dig tunnels through sand?
    I know that the co-hesion between the granuals is very weak thus totaly the wrong medium to use but... what if the digging machine had a ring of superheated material around it thus turning the sand to glass. would it then be stable enough to hold its own weight or would you need to reiforce it with concreate?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Ph.D.
    Join Date
    Dec 2006
    Location
    Norway
    Posts
    927
    that depends how deep you dig.


    when you have eliminated the impossible, whatever remains, however improbable, must be the truth
    A.C Doyle
    Reply With Quote  
     

  4. #3  
    Moderator Moderator
    Join Date
    Apr 2007
    Location
    Washington State
    Posts
    8,416
    Would need to be extraordinarily hot. Though sands are made up a wide range of materials, as an example, silicons melting point is more than 2500 degree F.
    Reply With Quote  
     

  5. #4  
    Forum Isotope Bunbury's Avatar
    Join Date
    Sep 2007
    Location
    Colorado
    Posts
    2,590
    Had a thought, (strange i know!) would it be possible to dig tunnels through sand?
    Planning a break-out?
    Reply With Quote  
     

  6. #5  
    Forum Freshman
    Join Date
    May 2008
    Location
    UK
    Posts
    45
    Well i wasnt going to say anything but i have been watching the great escape a few times, anyone got a couple of spare nazi uniforms i could borrow?
    Reply With Quote  
     

  7. #6  
    Forum Sophomore
    Join Date
    Jan 2007
    Posts
    158
    It might be easier to impregnate the sand with a resin or something that will set in to something hard, then tunnel through that. Easier still would be using supports of some kind from the start.
    Reply With Quote  
     

  8. #7  
    Forum Freshman
    Join Date
    May 2008
    Location
    UK
    Posts
    45
    So it is possible?

    But i imagine that the costs involved would make it prohibitive. Unless you could perfect the tecnique for a good price, you would make a killing
    Reply With Quote  
     

  9. #8  
    Forum Sophomore
    Join Date
    Jan 2007
    Posts
    158
    Reply With Quote  
     

  10. #9  
    Time Lord
    Join Date
    Apr 2008
    Posts
    5,328
    Since ~80% of concrete's bulk is sand & gravel (plus water) you could have most materials on site - I mean right there at the end of the tunnel.

    I imagine logistics and transport costs being much reduced if the concrete factory creeps along just behind the digger, using much of the excavated material.

    A range of aggregate sizes lock up most densely. They must be washed. Many tunnels have to pump out water anyway, which of course is pure as well water so just fine for the task at hand. Add a little cement powder and mix. That's it!
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •