中国科技核心期刊
美国化学文摘社(CAS)数据库
美国EBSCO学术数据库
日本科学技术振兴机构数据库(JST)
When a gold mine uses upward fan-shaped medium long hole blasting and caving method,the too many powdered ores are produced and the brow line and back row borehole are seriously damaged.Therefore,based on theoretical analysis and field practice,the method to determine reserved maximum charge-free length in the hole with virtual blast hole bottom space is proposed,2 hole spaced charging plans with reserved length are devised,and field industrial tests are carried out.Industrial tests show that the hole spaced charging plan No.2 can effectively solve the blasting problems in the field,reducing hole blasting explosive amount,mitigating the impact of hole blasting vibration and obtaining significant technical and economic index.Empirical formula is summarized,providing new basis for the determination of reserved maximum charge-free length in hole.