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1引言近年在露天开采中，为保护露天矿的永久边坡，减少爆破对周边未爆岩石的直接破坏作用，降低因爆破震动对附近未爆岩石的破坏，预裂爆破已被广泛应用。预裂爆破的成缝机理，迄今尚无公认的理论，尤其是在微节理裂隙发育的岩体中（该情况下预裂爆破很普遍）的成缝机理，所做
1 Introduction In recent years, in open pit mining, pre-cracking blasting has been widely used to protect the permanent slope of open pit mine, reduce the direct destructive effect of blasting on the surrounding unexploded rock, and reduce the damage caused by blasting vibration to nearby unexploded rock. There is no known theory about the stitching mechanism of presplitting blasting, especially for the stitching mechanism in rock mass with micro-joint fracture development (in this case, pre-cracking blasting is common)