| 摘要 |
A method for formation of bench faces at the ultimate pit in rocks with restricted strengthincludes drilling deep vertical wells to whole height of the bench, with subdrilling along designed line at nominal distance between those for the rocks, with formation of charges, mounting explosion network and blasting, excavation of blasted rocks. Line holes are drilled not coming to the line, with displacement to the side of worked-out area of the pit by distance L, m. |
