The technique of deep-hole presplittingblasting in coal bed is widely used for gas predrainage recently; but its blasting theory is not clear up to now.
煤层深孔预裂爆破近年来在瓦斯抽放中运用日益增多，但目前对其爆破理论研究较少。
2
The notch blasting mechanism is expounded by the fracture mechanics principle, the cutting tool parameters for notch presplittingblasting is put forward.
Under complex condition in a factory building, two large-scale reinforced concrete columns of the factory building were partially cut by the presplittingblasting.