| 摘要 |
FIELD: mining industry, applicable in opencast mining of hard rocks. ^ SUBSTANCE: the method consists in multirow drilling of the block to be blasted by holes of a permanent diameter, charging of the holes by explosive, connection of the explosive charges by a blasting network and short-delay blasting of them. The quantity of the energy of the charges in the lower part of odd rows is increased, for example, by drilling of parallel drawn together holes, whose charges are not similar is height, or by expansion of the holes in this part. The net of arrangement of charges of the even and odd rows is also increased. The order of blasting is provided by laying of the blasting network, each charge of the even order is blasted after weakening the mass broken by it by blasting of the increased charges of the previous odd row. In this case the quantity of the energy of an elementary charge of holes of each row approaches the quantity of the energy required for blasting destruction of the mass broken by them, thus providing the preset degree of crushing and enhancing of the blast efficiency. ^ EFFECT: enhanced yield of rock mass from one running meter of the hole, reduced consumption of explosive for breaking due to rational placement of the explosive in the mass. ^ 4 dwg, 1 tbl |
