| 摘要 |
PURPOSE: A blasting hole disposition structure for the tunnel blasting by a horizontal blasting method is provided to reduce to dig a tunnel by reducing the necessary ventilation time. CONSTITUTION: A blasting hole disposition structure for the tunnel blasting by a horizontal blasting method comprises three smooth blasting holes(110), two first blasting holes, and a plurality of around blasting holes(120-160). The three smooth blasting holes are each other separated and located on the center of a central cut. A first blasting hole is respectively located between the three smooth blasting holes. The around blasting hole is arranged on the circumference of the smooth blasting and the first blasting hole. The hole which can connect the three smooth blasting holes is blasted by blasting the first blasting hole. |
