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In the study of the application effectiveness of deep-hole controlled pre-splittingblasting technology,it was found through laboratory micro test and field study on a mine insouth China that under the technology,coal masses produce many irreversible cracks.Afterblasting,the nearer the distance from blasting hole,the larger the BET surface areaand volume ratio of the infiltration pore are;they increased by 11.47%and 5.73%,respectively.The coefficient of air permeability is increased 4 times.After 3 months,the gasdrainage rate was increased by 66%.In the first 15 days,the cumulative pumped gas was1.93 times of blasting before.The average absolute gas emission decreased by 63.46%.Experimental results show that deep-hole controlled pre-splitting blasting not only preventscoal and gas outburst,but also gives good economic results.
In the study of the application effectiveness of deep-hole controlled pre-splittingblasting technology, it was found through laboratory micro test and field study on a mine insouth China that under the technology, coal mass produce many irreversible cracks. Afterfinishing, the nearer the distance from blasting hole, the larger the BET surface area and volume ratio of the infiltration pore were; by increased 11.47% and 5.73%, respectively. coefficient of air permeability is increased 4 times. After 3 months, the gas drainage rate was increased by 66 % .In the first 15 days, the cumulative pumped gas was 1.93 times of blasting before. The average absolute gas emission decreased by 63.46% .Experimental results show that deep-hole controlled pre-splitting blasting not only only preventscoal and gas outburst, but also gives good economic results.