folded blasting scheme was employed after discussion by using millisecond delay blasting to direct the collapse towards the north.
经研究决定采用折叠爆破方案,向北倾倒,并运用毫秒延时起爆技术解决了倾而不倒问题。
the comprehensive blasting technology which combines u kerf blasting with presplitting blasting and smooth blasting and millisecond delay blasting was studied.