| 摘要 |
PURPOSE: A special blasting method using artificial free face is provided which minimizes generation of noise and vibration caused by blasting at base rock digging spot by blasting a base rock after forming the artificial free face in four directions of blast holes having a certain diameter. CONSTITUTION: In a blasting method using artificial free face(1) for blasting a base rock by forming artificial free face in four directions of blast holes(2) having a certain diameter, the special blasting method using artificial free face is characterized in that a distance (a) from the center of the blast holes to the center of the artificial free face formed in four directions of the blast holes is 112.5 mm, 133.5 mm, 153 mm and 450 mm if diameter of the artificial free face is 75 mm, 89 mm, 102 mm and 300 mm.
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