微差爆破即相邻炮孔或药室相隔数毫秒到数百毫秒先后爆炸。国外从五十年代起,国内从六十年代起即在矿山或岩石工程中广泛使用微差爆破。微差爆破的优点是可以显著降低地震效应和改善破碎质量。微差爆破改善破碎质量的假说有三个,一是形成新的自由面;二是利用岩块飞扬的动能进行补充破碎;三是利用残留在岩石中的应力和能量。通过现场试验检验这些理论提出用孔前方岩石运动的方向来区分破碎过程以及用以 Micro-blast that adjacent blasthole or drug compartment separated by several milliseconds to hundreds of milliseconds has exploded. Abroad Since the 1950s, China has been widely using the micro-differential blasting in the mine or rock engineering since the 1960s. The advantage of differential blasting is that it can significantly reduce the seismic effect and improve the crushing quality. There are three hypotheses about how to improve the quality of the crushing by the millisecond blasting: one is to form a new free surface; the other is to utilize the kinetic energy of the rockfill to supplement the crushing; and the third is to utilize the residual stress and energy in the rock. These field-test tests suggest that the direction of rock movement in front of the hole should be used to distinguish the crushing process from