According to the experiences of large-scale multi-row deep-hole delay blasting quarries, deep-hole delay blasting with more than ten rows or even tens of rows have many advantages. Through theoretical analysis and repeated experiments, we get some new knowledge of multi-row delay blasting skill. We consider it is necessary to choose reasonable delay time by inter sequence for accurately controlling blasting seism and improving blasting effects. In addition, it is efficient to charge more explosive intervals some rows to avoid "Dead-collapse of rock" when there are too many rows. But the reasonable inter - rows and weight of explosive to be added need to be researched.
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