| 摘要 |
FIELD: blasting operations in mining industry and construction, particular, breaking of overburden rocks by blasting in coal open pits. SUBSTANCE: height of primary blasting charge in vertical holes is taken equal to 0.5-0.87 of hole depth, and springing blasting charge are formed elongated with height equalling 0.7-1.2 of the height of respective primary blasting charge. Formation of spring blasting charge with nonuniform mass of 1 m long of these charge and/or in form of distributed cluster is also possible. EFFECT: higher efficiency. 3 cl |
