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Abstract In view of the high pressure and slow speed of the 15449S working face of Jiulong Mine of Jizhong Energy Fengfeng Group restricting the safe and efficient mining, and the combination of theoretical analysis and field measurement was used. The basic principle of pre-cracking and pressure relief technology combined with the actual situation of the site, the use of cutting-edge pre-cracking pressure relief blasting technology was proposed to pre-treat the top plate to reduce the strength of the roof.
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