A STAGGERED GRID ARRANGEMENT OF HOLES FOR BLASTING AT QUARRIES

Abstract

The application in the production of blasting chess
the location of the blast hole. For a long time, the
effectiveness of this approach was uncertain. This is
primarily due to certain difficulties in the process of
drilling. However, a number of works performed in
the Institute of mining of the Ministry of ferrous metallurgy of the USSR showed the effectiveness of a
staggered arrangement of the wells using the diagonal scheme of initiation of the explosive charges in
the excavation blocks at the quarries. In the topic
was formulated, the scientific theoretical provisions
allowing for the use of the approach to determining
the angle of inclination of the diagonal in almost all
rocks. Currently this approach has good prospects
for development. With the study of the direction of
the cracks of rocks within the boundaries of an excavation unit can efficiently use the slope of the diagonal of the initiation of charges, due to the checkerboard layout. The use of conditionally chess grids
of wells location in the excavation blocks due to the
establishment of rational direction of initiation of
charges to increase crushing action of the explosion.