Estimation of specific charge value before blast operation


  • Abdurrahman Tosun


In the literature, many equations estimating the size distribution of pile occurred according to the specific charge value before blasting, the efficiency of loader and the efficiency of the crusher have been developed. It is necessary to compute clearly the specific charge value before blasting so that these developed equations can give correct results the Length of the blasting surface and the order number of blasthole affect the specific charge value considerably (Tosun et al., 2013). In this study, a certain number of blast tests have been carried out in three different limestone quarry and an equation estimating the specific charge value before blasting was developed by using the parameters such as the length of the blasting surface, the order number of blasthole (the amount of burden of both end holes of the blasting surface), the height of the bench, uniaxial compressive strength of the rock, and  the amount of explosives available in one meter of the blasthole.  



Bergmann, O. R., Riggle, J.W. and Wu, F.C. (1973). Model rock blasting effect of explosives properties and other variables on blasting results. International J. Rock Mechanics and Mining Sciences, vol. 10, pp. 585- 612.

Bilgin, H. and Pasamehmetoglu, A. (1986). Study of drillibility and blastibility of rocks. 1. Rock Mechanic Symposium, Ankara, pp. 113-125.

Chung, S.H. and Katsabanis, P.D. (2000). Fragmentation prediction using improved engineering formulas. International J. Fragmentation by Blasting, vol. 4, pp.198-207.

Cunningham, C. V. B. (1987). Fragmentation estimations and The Kuz-Ram model. 2nd Int Symp on Rock Fragmentation by Blasting, pp. 475-487.

Hoek, E. and Bray, J.W. (1981). Rock slope engineering. The Enstitute Of Mining and Metallurgy, London.

Holmberg, R. (1974). Charge calculations for bench blasting. SveDeFo Report Swedish Detonic Research Foundation, Stockholm, In Swedish.

Kojovic, T., Michaux, S. and McKeinze. (1995). Impact of blast fagmentation on crushing and screening operations in quarrying. EXPLO 95 Conference, Brisbane, September, pp. 427- 436.

Kou, S. and Rustan, A. (1993). Computerized design and result prediction of bench blasting. In Proc 4th. International Symposium on Rock Fragmentation by Blasting, Balkema Rotterdam, pp. 263-271.

Langefors, U. and Khilström, B. (1963). The modern Technique of Rock Blasting. Uppsala, Sweden.

Larsson, B. (1974). Report on blasting of high and low benches- fragmentation from production blasts. In Proc. Discussion Meeting BK 74, Swedish Rock Construction Committee, Stockholm, pp. 247-273.

Lilly, P.A. (1986). An empirical method of assessing rock mass blastability. In ProcLarge Open Pit Mining Conference, pp. 89-92.

Nielsen, K. and Kristiansen, J. (1996). Blasting-crushing-grinding optimisation of an integrated comminution system. Rock Fragmentation by Blasting, Balkema, Rotterdam.

Rustan, A. (1981). Fragmentation influencing factors in rock blasting. Technical Rapport, Lulea university of Technology, Lulea, Sweden, 38T.

Cunningham, C .V. B. (1983). The Kuz-Ram model for prediction of fragmentation from blasting. In Proc 1st Int. Symposium on Rock Fragmentation by Blasting, pp. 439-453.

Workman, L. and Eloranta, J. (2004). The effects of blasting on crushing and grinding efficiency and energy consumption. In Proc ISEE 29th Ann Conf Expl. & Blasting Technique, pp. 131-140.

Toper, A.Z. 1988. Study on blasting parameters in TKI open lignite mine. A Master Thsesis, (Middle east technical university), Ankara.

Tosun, A., Konak, G., Karakus, D., Onur, A.H., Toprak, T. (2012). Investigation of the relationship between blasting pile density and loader productivity. Rock Fragmentation by Blasting, New Delhi/India, pp. 385-391.

Tosun, A. Konak, G. Onur, A.H., Karakus, D. Ongen, T. (2013). Evaluation of specific charge parameter on open-pit blasting. 23 rd World Mining Congress, Montreal/Canada, paper no: 851.






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