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Tunnel Blasting Design Suited to Given Specific Charge  

Choi, Byung-Hee (한국지질자원연구원 지구환경연구본부)
Ryu, Chang-Ha (한국지질자원연구원 지구환경연구본부)
Jeong, Ju-Hwan (한국지질자원연구원 지구환경연구본부)
Publication Information
Explosives and Blasting / v.27, no.2, 2009 , pp. 33-41 More about this Journal
Abstract
Specific charge, also called powder factor, is defined as the total explosive mass in a blast divided with the total volume or weight of rock to be fragmented. It is a well-known fact that change in explosive consumption per ton or per cubic meter of rock is always a good indication of changed rock conditions. In mining, it is common to use explosive consumption per ton of ore as a measure of the blastability for rock. On the contrary, in civil engineering, it is common to use explosive consumption per cubic meter of rock. In this paper, we adopt the definition of the civil engineering because we are mainly concerned with tunnel blasting. Up to now, although various methods for tunnel blast design have been proposed, there are so many cases in which the proposed methods do not work well. These may be caused by the differences in rock conditions between countries or regions, and can give a serious technical difficulty to a contractor. But if we know the specific charge for a given rock, then the blast design can become much more easier. In this respect, we suggest an algorithm for tunnel blast design that can exactly produce the predetermined specific charge as a result of the design. The algorithm is based on the concept of assigning different fixation factors to various parts of tunnel section, and may be used in combination with the known methods of tunnel blast design.
Keywords
Specific charge; Powder factor; Tunnel blast design; Fixation factor;
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  • Reference
1 Rustan, A., 1998, Rock Blasting Terms and Symbols, A. A. Balkema, Rotterdam, pp. 149-150
2 Persson, P., R. Holmberg and J. Lee, 1994, Rock Blasting and Explosives Engineering, CRC Press, pp.191-193, pp.184-185, p. 224