1. State Key Lab of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan 430072，China；
2. MOE Key Lab of Rock Mechanics in Hydraulic Structural Engineering，Wuhan University，Wuhan 430072，China
The influence action mechanism of detonating position was analysed in a perspective of propagation and reflection of blast stress wave. Based on drill-blast excavation of a tunnel, the slotting effect of a cut-hole and the corresponding induced blast vibration responses of the support structure under different detonating locations were analyzed contrastively with numerical simulation. Results indicated that both the cut-hole’s slotting effect and blast vibration responses of the support structure have larger differences under different detonating locations; the blast vibration of the support structure under direct initiation is minimum in favor of the support structure’s safety, but the cut hole’s slotting effect is poor; the slotting effect of reverse initiation is best, but the induced blast vibration of the support structure is maximum to seriously threaten the support structure’s safety; under middle initiation, both the slotting effect and the blast vibration of the support structure are mediate. According to different conditions of surrounding rock, the selection of cut holes’ detonating location was optimized
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