| 摘要 |
FIELD: mining.SUBSTANCE: invention relates to mining, is used in blasting ores and rocks with borehole explosive charges. Method involves drilling blast holes, their charging with explosive charges and blasting said explosive charges. Before drilling blast holes, method includes drilling pilot blasting wells, number and arrangement of which is determined based on broken volume and physical-mechanical properties of ores and rocks. Further, method comprises hydraulic fracturing of ores and rocks perpendicular to pilot explosive wells at elevation of bench bottom. Drilling of blast holes, charging thereof and pilot blast holes with explosive charges and blasting explosive charges therein is carried out after said hydraulic fracturing.EFFECT: preliminary separation of cut mass from ores and rock mass and avoiding formation of composite explosive charges in absence of subgrade drilling of blast holes.4 cl, 1 dwg |
