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顺序爆破技术将孔外和孔内爆破延期结合起来,爆破设计人员利用这种技术可提高爆破设计的灵活性,有利于改善爆堆和提高爆破破碎质量,同时可最大限度地减小空气冲击波、飞石和地面震动等有害作用。台阶爆破经验表明,平行自由面的各排炮孔孔间延期时间如果每英尺最小抵抗线取1～5毫秒和排间延期时间为此值的2～3倍,往往会取得最优爆破效果。为使各个炮孔的空气冲击波叠加减小到最低限度,冲击波沿自由面的传播速度应低于500英尺/秒左右。经验也证明,如果单位炸药消耗量的利用率过低,则地面震动强度可能明显提高。实验证明,可以修改地面震动频率量,通过调节延期间隔排除无用分量。
The sequential blasting technique combines the post-hole and blasthole delamination extension. Blasting designers can use this technique to improve the flexibility of blasting design, improve the blasting pile and improve the quality of blasting and crushing, and at the same time minimize the air blast, Flystone and ground vibration and other harmful effects. Bench blasting experience shows that the parallel free surface of each row of holes between the hole time delay if the minimum resistance line per foot to take 1 to 5 milliseconds and the delay time between the rows for this value of 2 to 3 times, often will get the best blasting effect. In order to minimize the superposition of air blast waves at each blasthole, the shock wave should propagate along the free surface at speeds below about 500 feet per second. Experience has also proved that if the unit utilization rate of explosives consumption is too low, the ground vibration intensity may be significantly increased. Experiments show that the amount of ground vibration frequency can be modified to eliminate unnecessary components by adjusting the delay interval.