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微差间隔时间是影响多排微差爆破效果的主要因素之一,它主要依据爆区岩石性质、孔网参数以及对爆破工程的具体要求等因素来确定。在实际生产中,微差间隔时间往往倾向于尽可能的延长,使其能充分满足形成补充自由面所需要的时间,以寻求较理想的爆破效果。但微差间隔时间过长,大于岩石位移时间时,可能发生拒爆。因此,微差间隔时间的延长是有限度的。其极限值,应符合下述公式:
The difference interval is one of the main factors that affect the effect of multi-row millisecond blasting. It is mainly determined by the rock properties in the blasting area, the parameters of the pore network and the specific requirements of the blasting project. In actual production, the time interval of microsecond tends to extend as long as possible so that it can fully meet the time needed to form a free surface to seek a better blasting effect. However, the difference between the time interval is too long, greater than the rock displacement time, may occur refused to burst. Therefore, there is a limit to the extension of the difference interval. The limit value should be in accordance with the following formula: