| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for blasting capable of achieving a safely and efficiently blasting work by a single-point centralized explosive powder charge or bar-like explosive powder charge to a landform having a plurality of free surfaces. SOLUTION: A perforated hole length H is excavated toward an interior of a perpendicular direction from a free surface G1, an explosive powder charge amount L is charged in the hole length H so that a shortest distance between a bar-like end of the amount L, and the surface G1 is set to a minimum resistance wire length W1, while a bar-like explosive powder charge of the amount L is provided at a position of a minimum resistance wire length W2 set from another free surface G1 toward a landform of a perpendicular direction equal to the length W1 in a positional relationship between the charge of the amount L and another minimum resistance wire length W2, and designed and executed under the conditions that a perforated hole interval length D is set equal to the plurality of the minimum resistance wire lengths, and the amount L is set to a range of a blasting coefficient c=0.2 to 0.5 to a fracture baserock volume DWH.
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