Rational parameters of blasting, considering action time of explosion-generated pulse.

The developed pattern of calculation for the parameters of drilling and blasting in boreholes and shotholes is based on a charge design with reduced amount of explosive at the top. The calculation takes into account the action time of the explosion-generated pulse conditioned by outflow of detonation product gases. The authors have derived relations for such rational parameters of drilling and blasting that minimize costs of drilling at the same quality of rock fragmentation. [ABSTRACT FROM AUTHOR]