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BLASTING PATTERN DESIGN WITH A NEW DEVELOPED SOFTWARE FOR BAJGIRAN TUNNEL, IRAN

AUTHOR/S: M. JAMSHIDI, M. ATAEI, H. M. NASIR ABAD
Sunday 1 August 2010 by Libadmin2008

8th International Scientific Conference - SGEM2008, www.sgem.org, SGEM2008 Conference Proceedings/ ISBN: 954-918181-2, June 16-20, 2008, Vol. 1, 385-396 pp

ABSTRACT

Blast pattern design has direct influence on the time consumption and construction cost
of drilling and blasting of tunnels. Tunnel blasting is more complicated operation than
open pit blasting because the only free surface that initial breakage can take place
toward is the tunnel face. The most important operation in the tunnel blasting procedure
is to create an opening in the face with the intention of develop another free surface in
the rock. This is the function of the cut holes. The cuts can be classified in two groups:
parallel hole and angle hole cuts. Two tunnel blasting design methods (Nitro Nobel and
Energy transfer from explosive to rock) are based on these cut holes. The calculations of
the required parameters in these methods are really time consuming and doing these
computations manually may includes some mistakes. To reduce the time consumption
and doing the calculations with more confidence, a computer software was produced. In
this paper, we attempted to design blasting pattern of Bajgiran tunnel in Iran by using
this software. Obtaining true results with a rapid procedure showed that the use of
computer aided devices can lead to better and more accurate answers.

Keywords: Tunneling, Angle hole cut, Parallel hole cut, Nitro Nobel, Blasting pattern

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