简要论述了深孔爆破提高瓦斯抽放的机理，以煤体中柱状装药爆炸后的裂隙圈半径进行了计算。
The principle of increasing gas emission rate by long hole blasting in the crossing hole is discussed. The radius cracked zone in coal seam caused by long hole blasting is calculated.
运用爆炸冲击波理论，讨论了炮孔柱状装药爆破时的岩石粉碎区及其形成时间、爆腔半径及其扩胀规律。
According to the theory of shock waves, the smash district and its forming time, the blasting cavity radius and its expanding characteristics are all discussed in this paper.
本文应用叠加方法模拟了柱状装药爆炸时的动态应力场，通过计算机数值模拟得到了柱状装药爆炸时应力峰值的衰减规律和应力分布特点。
Applying reiterative method, this Paper simulates the blasting stress field of cylindrical charge, and then, gets attenuation law stress peak value and characteristics of stress distribution.
同时表明：不耦合装药时药包周围空气间隙的大小对柱状空腔半径影响较大。
At the same time, it showed that the size of air gap around charge has important impact on the cylindrical cavity radius.
同时表明：不耦合装药时药包周围空气间隙的大小对柱状空腔半径影响较大。
At the same time, it showed that the size of air gap around charge has important impact on the cylindrical cavity radius.
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