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Rock Bolting

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Rock bolting is a primary means of rock reinforcement used to stabilize excavated rock in underground mines and tunneling. Rock bolts are systematically arranged in such a manner as to transfer the load from the unstable surface or exterior of the rock, to the stronger interior part of the rock.

Rock bolting is a key component of the New Austrian Tunneling Method (NATM) in that reinforcement and support is maximized with the addition of welded wire meshing and shotcrete in combination with rock bolting. The combination of rock bolting and wire mesh screening has actually been used in Canada’s mining industry since the 1940s.[1]

[edit] Process

The rock mass can be reinforced by rock bolting in one of the following ways: building beams, erecting a pressure arch, support of discrete blocks, and suspension of weak, fractured ground to more competent layers.[2]

Mechanical-anchor bolts, resin bolts, and cement-bonded bolts are the common types of rock bolts used[3] Mechanical-anchor bolts utilize an expansion shell to secure an anchoring point at the end of a drilled hole in stable ground. Installation entails simply pushing the bolt up inside a drilled hole and tensioning it. Resin bolts and cement-bonded bolts differ in that they rely on the bonding property of resin or cement to transfer rock loads.[4] The installation of the rock bolts can be achieved either manually with stoppers and impact wrenches, or mechanically with pneumatic bolting equipment.

[edit] References

  1. Economic and Productivity Comparison. Report Document. 2008-09-08
  2. Hustrulid, William A. and Bullock, Richard L. Underground Mining Methods. SME: 2001.
  3. Hustrulid, William A. and Bullock, Richard L. Underground Mining Methods. SME: 2001.
  4. [Hustrulid, William A. and Bullock, Richard L. Underground Mining Methods. SME: 2001.