Abstract With the development of electronic detonators, the precise initiation timing has been controlled at the microsecond level, which are accurate enough to guarantee waveform collision at precise locations in hole. The accumulated energy effect by collision of two oppositely traveling in-hole detonation waves was proved theoretically based on impact dynamics theory. And the fragment size distributions and blasting vibration under different initiation modes with electronic detonators were also investigated by comparing the field test and numerical simulations results of bench blasting. The results show that the detonation products density near the collision point is increased, the particle velocity is reduced, and the kinetic energy is converted into pressure energy, the pressure near the collision point is greater than the sum of the strength of the two detonation waves, demonstrating the potential for an increase in fragmentation and throw. At the same time, the angle of the shock wave formed in the rock mass is deflected, changing from tilt to horizontal direction, direct the pressure toward to the bench face. The field test also indicated that the in-hole dual initiation method could cause both higher peak particle velocity and higher vibration frequency.

中文翻译：

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台式爆破作业电子雷管双起爆孔内爆轰波相互作用机理

摘要 随着电子雷管的发展，精确起爆时间已控制在微秒级，足以保证孔内精确位置的波形碰撞。基于冲击动力学理论，从理论上证明了两个相反行进的孔内爆震波的碰撞累积能量效应。并通过对比台架爆破的现场试验和数值模拟结果，研究了电子雷管在不同起爆模式下的破片尺寸分布和爆破振动。结果表明，碰撞点附近的爆轰产物密度增加，粒子速度降低，动能转化为压力能，碰撞点附近的压力大于两个爆轰波的强度之和，表明有可能增加碎片和投掷。同时，在岩体中形成的冲击波的角度发生偏转，由倾斜方向变为水平方向，将压力导向台面。现场试验还表明，孔内双起爆方法可以导致更高的峰值粒子速度和更高的振动频率。