Analysis of the influences of rock mass properties on the blasting performance in open cast mines

Kaçar, Gökhan
This study has aimed to investigate the influences of rock mass properties on the blasting performance in open cast mines. To this end, discontinuity spacings and discontinuity orientations have been measured and full scale blasts with various designs have been observed in open cast mines of Aegean Lignite(ELI) and Bursa Lignite(BLI) Establishments belonging to Turkish Coal Enterprises (TKI). Influences of the above mentioned rock mass properties on fragmentation and blasting cost have been investigated. Fragmentation influencing the excavator productivity have been taken as a criterion in order to compare the results of blasts. Particle size distribution representing fragmentation has been determined by means of a software using image processing. 50%(K50) and 80%(K80) passing sizes and topsize values have been used in determination of blasting performance according to rock mass properties. The results show that increasing trend exists for the relationships between rock mass properties and K50, K80 and topsize values. Fragmentation parameters (K50, K80, topsize) increase as the orientation angle, which is the acute angle between the strikes of slope face and major discontinuity, increases. Additionally, these parameters increase as the discontinuity modal spacing or in-situ block size index increases. Moreover, increasing trend is observed for the relationships between rock mass properties and blasting cost, too. Blasting cost increases as the orientation angle increases. Furthermore, blasting cost increases as the discontinuity modal spacing or in-situ block size index increases.


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Citation Formats
G. Kaçar, “Analysis of the influences of rock mass properties on the blasting performance in open cast mines,” Middle East Technical University, 2002.