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Numerical Study on the Effects of Air Decking in Half Charge Blasting Using AUTODYN  

Baluch, Khaqan (전남대학교 에너지자원공학과)
Kim, Jung-Kyu (전남대학교 에너지자원공학과)
Kim, Seung-Jun (전남대학교 에너지자원공학과)
Jin, Guochen (전남대학교 에너지자원공학과)
Jung, Seung-Won (전남대학교 에너지자원공학과)
Yang, Hyung-Sik (전남대학교 에너지자원공학과)
Kim, Nam-Soo ((주)NSB 나우이엔씨)
Kim, Jong-Gwan (한국광물자원공사)
Publication Information
Explosives and Blasting / v.36, no.4, 2018 , pp. 1-8 More about this Journal
Abstract
This numerical study was intended to evaluate the applicability of the half charge blasting to mining and tunnelling. The half charge blasting is a method that two separate rounds are sequentially blasted for the rock burdens in which long blast holes have already been drilled at one operation. The aim of the method is to decrease the construction cost and period in mining and tunnelling projects as well as to increase the blasting efficiency. Several numerical analyses were conducted by using the Euler-Lagrange solver on ANSYS AUTODYN to identify the effects of the suggested method on the blasting results in underground excavations. The overall performance of the suggested method was also compared to an ordinary blasting method. The analysis model was comprised of the Eulerian parts (explosive, air, and stemming materials) and the Lagrangian parts (rock material). As a result, it was found that, owing to the air decks formed in the bottom parts of the long blast holes, the first round of the suggested method presented a higher shock pressure and particle velocities in the vicinity of the blast holes compared to the ordinary blasting method.
Keywords
Half charge blasting; AUTODYN; Euler-Lagrange solver; Air deck; Blast pressure; Mine blast; Tunnel blast; Particle velocity;
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  • Reference
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