Application of Low Detonation Velocity Powder Emulsion Explosive in Smooth Blasting
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摘要:针对平硐开拓光面爆破施工工况，采用粉状乳化炸药、矿物质粉、多孔有机物密度调节剂混合制备出一种低爆速粉状乳化炸药，通过调节各组分比例，控制爆速在1 200~3 000 m/s范围内，以适配光面爆破作业。采用LSDYNA进行数值模拟分析并开展现场实际应用，结果表明：低爆速粉状乳化炸药耦合装药结构对孔壁破坏较小，爆破作用更均匀，半孔率可达90%，超欠挖量在10cm以内，有效提高了边墙成型效果，边墙半孔率提高50%。本研究为光面爆破施工提供了借鉴。
Abstract:Aiming at the smooth blasting construction condition of adit development, a low detonation velocity powder emulsion explosive was prepared by mixing powder emulsion explosive, mineral powder and porous organic density regulator. The detonation velocity was controlled within the range of 1 200~3 000 m/s through adjusting the composition ratio of each component, which is suitable for smooth blasting operation. Through LSDYNA numerical simulation analysis and field application, it is found that the coupling charging structure of low detonation velocity powder emulsion explosive has less damage to the hole wall, and the blasting effect is more uniform. The half-hole rate can reach 90%, and the over-excavation amount is less than 10cm, which effectively improves the forming effect of the side wall and increases the half-hole rate of the side wall by 50%. The study provides a reference for smooth blasting construction.
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