Roy, S.K. and Singh, R. R.
(2011)
Achieving higher pull and yield in solid blasting in underground coal mines using spacer-aided-initiation technique.
Journal of Mines, Metals & Fuels, 59 (3&4).
pp. 68-75.
ISSN 0022-2755
Abstract
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 P5 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 P5 explosive having high air gap sensitivity namely pentadyne -HP was also developed for use in this method.
Pull up to 1.7m in shot holes of 1.8m length and up to 2.2m in shot holes of 2.4m length were achieved with yield of coal ranging from 24 to 41 tones per blast depending on the face dimensions during field trial fo this method with pentadyne-HP in an underground coal mine of SCCL Considering the fact that there has not been any innovation in solid blasting since its inceiption in 1969, improvement in pull and yield by 60% to 110% under different conditions achieved using spacer-aided-initiation in solid blasting with Pentadyne-HP can be considered to be a great achievement. Result of field trials proved that his method of spacer-aided-initiation has potential to increase production and productivity of underground coal mines in india by achieving consistently higher pull and yield per blast in solid blasting.
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