Establishment of the effective modes of the slowdown explosion by rocks destruction at quarries

Existing for today theoretical modeling tools of the mass explosion do not fully consider the sequence and intensity of destruction of the rock mass. This leads to significant energy losses in the explosion. Therefore, the control of the sequence and modes of micro- and millisecond delayed blasting of systems of borehole charges of explosives in quarries will allow achieving better mass explosion indices. Interaction of the stress waves generated by the individual charges explosion is considered in this work as a way to control the effect of an explosion in a rock mass. It is established that the maximum value of the amount of rocks destruction in the presence of a single plane of exposure depends on the interval of delay between the explosion of the adjacent borehole charges in a group, which, in turn, is determined by the ratio of the distance between charges to the velocity of propagation of longitudinal stress waves in the rock mass. A formula for determining the rational delay interval between bursts of charge groups, which takes into account both the physical and mechanical properties of the rock mass and the main technological parameters of the explosion is proposed. Based on the results of research, the blasting scheme is recommended to be formed taking into account the deceleration intervals between the groups of borehole charges and for adjacent charges placed in one group.