In order to study the influences of interval charge length of the open deep-hole blasting on the rock crushing, propagation change rule of explosive stress in the rock under the condition of different interval length and resistance line is studied in this paper based on ANSYS/LS-DYNA finite element numerical simulation method.The simulation results show that the interval length is related to the resistance line.When the interval length is a fixed value, there would be a critical length of resistance line.The two linear charges act on the rock alone, boulder yield will be increased between interval medium and the free face, and the utilization rate of the blasting energy will significantly reduce, when the length is less than the critical value.Through the analysis of the stress change rule, the interval length is better to take less than a third of resistance line in the open deep-hole blasting and other blasting engineering.
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