The importance of it in safety production of coal mine was discussed through accident case, according to theoryofblasting powder and function of stemming.
本文根据炸药的作功原理和炮眼封泥的作用，通过事故案例，论述炮眼封泥质量在煤矿安全生产中的重要性。
2
The radius of fracture zone and cracked zone can be calculated by theoryofblasting, and blasting effectiveness of different blasting project can be analyzed and simulated by the software of LS-DYNA.
用爆破理论计算爆破的压碎区和裂隙区半径，用LS - DYNA软件模拟分析了不同爆破方案的爆破效果。
3
The result not only ensured the safety of the construction and that of the surrounding buildings, but also complements the theoryof squeezing silt by blasting and guides similarity engineering.