According to lab model experiment and theory analysis,the rational delay intervalof millisecond blasting used in rock drift excavating was acquired and a new type of long millise-cond delay detonator was researched and manufactured.

• 根据实验室模型试验和理论分析得出岩石巷道掘进微差爆破合理延迟间隔时间，据此研制出新型长延迟毫秒雷管。