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Recent content by NEMINING

  1. NEMINING

    SHOTCRETE ARCHES

    Buggar, I'm also being really conservative here. Not only i'm applying our normal rock-bolting support, but because of this particular case, I'm adding shotcrete + steel reinforcement. Remember, i'm talking about a good rock quality here (RMR>75). I just want to know that in case all my...
  2. NEMINING

    SHOTCRETE ARCHES

    BAretired, thanks for the reply I'm not concerned about the horizontal forces on the rock, as the rock we are dealing with is massive and has a high UCS (UCS>180 MPa). I'm more worried about exceeding the shear strength of the reinforced shotcrete arch at the haunch. So that's why I would like...
  3. NEMINING

    SHOTCRETE ARCHES

    I looked into The Army Corps of Engineers tunnel design: EM 1110-2-2901, and I couldn't find my answer. Thanks for your suggestion bridgebuster Good Question Buggar ! When we blast the first round, the rock is still self-supporting. We apply shotcrete arches and then we move ahead and blast...
  4. NEMINING

    Shotcrete Arches

    Hello, I'm a rock mechanics engineer and I would like to calculate my factor of safety of shotcrete arches holding a certain rock weight. The shotcrete arches have the same profile as the excavation drift (15'W x 15'H) but has an arch in it in the back. The shotcrete thickness in the shoulders...
  5. NEMINING

    SHOTCRETE ARCHES

    Hello, I'm a rock mechanics engineer and I would like to calculate my factor of safety of shotcrete arches holding a certain rock weight. The shotcrete arches have the same profile as the excavation drift (15'W x 15'H) but has an arch in it in the back. The shotcrete thickness in the shoulders...
  6. NEMINING

    Bituminous Geomembrane - UV exposition Time

    Hi, I'm currently working on the construction of a dam where we have to place a bituminous geomembrane on top of its upstream face. The Teranap 331 TP has been chosen for this purpose. I would like to know what is the maximum UV exposition time, knowing that the temperature may reach 50...
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