Under the detonation gas loading, the cracks near the hole extend under the gas-driven and the father cracks grow under the gas pressure and the in site stress.

• 在爆生气体作用下，爆破近区的裂纹在气体驱动压力下扩展，而爆破中区的裂纹扩展是在气体膨胀压力场和原岩应力共同作用下发生的。