Optimization of cut-hole’s detonating position in tunnel excavation

GAO Qidong1,2,LU Wenbo1,2,LENG Zhendong1,2YANG Zhaowei1,2,YAN Peng1,2,CHEN Ming1,2

Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 8-16.

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 8-16.

Optimization of cut-hole’s detonating position in tunnel excavation

  • GAO Qidong1,2,LU Wenbo1,2,LENG Zhendong1,2YANG Zhaowei1,2,YAN Peng1,2,CHEN Ming1,2
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Abstract

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

Key words

tunnel excavation / cut-hole / detonating location / slotting effect / blast vibration

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GAO Qidong1,2,LU Wenbo1,2,LENG Zhendong1,2YANG Zhaowei1,2,YAN Peng1,2,CHEN Ming1,2. Optimization of cut-hole’s detonating position in tunnel excavation[J]. Journal of Vibration and Shock, 2018, 37(9): 8-16

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