关键词: 爆破振动, 电子雷管, 导爆管雷管, 小波包分析, 峰值质点速度

Abstract: In order to compare the effect of delayed initiation of electronic detonators and nonel detonators on the distribution law of blasting vibration energy,the model test and field test were carried out from the perspective of blasting vibration energy. Based on MATLAB wavelet packet analysis method,the blasting vibration signal is divided into 32 frequency bands according to frequency,and the energy and particle peak velocity of each frequency band are analyzed. The results show that the vibration energy generated by the detonators of electronic detonators and nonel detonators is mainly concentrated in the 1 ~ 4 frequency band (0~ 125 Hz),and the energy distribution tends to the middle and high frequency band with the increase of blasting vibration energy. The vibration energy significantly affects the PPV,and the PPV in each frequency band of detonator decreases from low to high,and then increases and then decreases,showing an " N-shaped" distribution. In the field test,compared with the nonel detonator,the average vibration reduction rate of the electronic detonator is 21. 3% and the average vibration energy is reduced by 32. 7%. When using detonator for differential blasting operation,the delay accuracy of nonel detonator is poor,which leads to obvious vibration superposition effect between holes,and the vibration energy generated by blasting is much larger than that generated by electronic detonator. In practical engineering,setting reasonable delay time with electronic detonator can effectively reduce blasting vibration.