Using the methods to calculate parameters of drilling and blasting operations for emulsion explosives

been applied to obtain formulas for the calculation of crush zone
radii, intensive fragmentation, and crack formation around the
charging cavity in the structure, diameter of the charging cavity,
diameter of the charge itself, detonation characteristics of an
explosive, boundaries of the rock strength, rock mass jointing, and
mineral compression under the effect of rock pressure. The methods
have been developed to calculate parameters of drilling and blasting
operations (DBOs) while driving the mine workings based upon the
idea of the arrangement of blastholes in terms of areas they occupy
in a fore-breast as well as upon their location relative to break-off
outline. Stage one of the methods involves calculating and designing
burn cuts where a distance between blastholes is determined with the
help of a fragmentation zone radius. Stage two means calculation of
both specific and total explosion consumption per borehole bottom,
line of least resistance (LLR) for a borehole in terms of intensive
fragmentation, areas of borehole groups, borehole number, analytical
and actual distance between boreholes, actual charge amount per
borehole, and actual specific and the total explosive (E) consumption
per borehole bottom. The methods have been tested in the operating
ore mine while driving a mine working. Emulsion explosive (EE)
Ukrayinit-PP-2 (Україніт-ПП-2) has been applied. The developed
methods have been used to calculate DBOs parameters for the
explosive. Trial blasts demonstrated the good firing of a borehole
bottom and uniform ore fragmentation; a high coefficient of borehole
use has been supported.