Analysis of vibration effect and optimization of blasting parameters for large diameter empty hole blasting in shaft
The large diameter empty hole has a complex influence on the cutting blasting and its vibration effect.Taking Zhanhua Road Shaft Project of Qingdao Metro Line 5 as the background,by means of numerical simulation and field test,the influence of the diameter of large-diameter hollow hole and the ratio K of the distance between charge hole and hollow hole on the rock breaking effect and the response law of surface vibration velocity in the cutting area is revealed.The results show that:the hollow zone blasting rock breaking vibration damping effect and K value is significantly positively correlated with the Kvalue of 1 for the large diameter hollow hole cavitation effect is the most reasonable;the use of largediameter hollow hole(Φ80 cm)hollow,combined with the digital electronic precision delay based on thehole-by-hole detonation can be accurately controlled in the peak vibration velocity of the surface plasma in the 0.3 cm/s;field test monitoring and numerical simulation results The error is about 8％,indicating that the research method is reasonable and feasible.The conclusions of the study can provide a basisand reference for accurately controlling the harmful effects of urban subway and shaft blasting.
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