| 摘要 |
FIELD: blasting. ^ SUBSTANCE: invention is related to the field of blasting in mining, construction and other industries and may find application mostly in production of block stone. Method for breaking of rocks consists in drilling of borehole, arrangement of explosive charge in it and blasting of this charge. Additional charge is located on free surface, which is blasted after blasting of the main charge in borehole, but not later than "leader" crack reaches free surface. Area of additional charge location and delay of blasting time is determined by calculation-experiment method. Additional charge is located at a distance from the point of lowest resistance line outlet. ^ EFFECT: invention makes it possible to improve quality of breaking and to reduce yield of off-grade blocks. ^ 2 cl, 1 dwg |
