Achieving higher pull and yield in solid blasting in underground coal mines using spacer-aided-initiation technique

摘要

Spacer-aided-initiation technique envisages distribution of explosive energy over longer length of shot hole using plastic spacers for air decking of cartridges with single priming at one end of suitable P_5 explosives for achieving longer pull in solid blasting. In a Ministry of Coal funded S&T project, all relevant parameters were studied by Explosive and Explosion Laboratory of CIMFR under simulated conditions to establish safety and efficacy of using spacer-aided-initiation technique in solid blasting in underground coal mines. Based on which, DGMS approved this method initially for field trial in May 2007 and after successful field trial finally for commercial use in August 2009. A special P_5 explosive having high air gap sensitivity namely Pentadyne-HP was also developed for use in this method.