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A Study on Rock Fragmentation Variation by Delay Time  

Jin, Yeon-Ho ((주)한화)
Min, Hyung-Dong ((주)한화)
Park, Yoon-Suk ((주)한화)
Heo, Eui-Haeng ((주)한화)
Choi, Sung-Oong (강원대학교 에너지.자원공학과)
Lee, Seung-Joong (강원대학교 에너지.자원공학과)
Publication Information
Explosives and Blasting / v.32, no.3, 2014 , pp. 1-9 More about this Journal
Abstract
Since the rock fragmentation from a bench blasting can affect the subsequent processes including loading, hauling and crushing, its control is essential for the assessment of blasting efficiency as well as production cost. In this study, the delay time could be precisely controlled by using electronic detonators. The rock fragmentations resulted from the blastings with different delay times of 1, 2, 3, 4, 5, 7 and 10ms per each meter of burden were measured from full scale field tests in a limestone mine. The results showed that the optimum delay time for minimum fragmentation was approximately 6ms/m. From the analysis of fragmentation size distribution, it was possible to find that delay time can be a parameter on rock fragmentation and thus it would be possible to control rock fragmentation by adjusting delay time.
Keywords
Delay time; Fragmentation; Electronic detonator;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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