underbreak造句

• Abstract : the application of smoothwall blasting in crushed surrounding rock of no . 2 tunnel with crushed surrounding rock has obtained more satisfactory results through selecting rational blasting parameters , adopting right supporting method and controlling the overbreak or underbreak of the tunnel effectively , etc
  文摘:在周家山2号隧道破碎围岩施工中，应用光面爆破技术，通过选择合理的爆破参数，正确的支护施工方法，有效地控制隧道的超欠挖，加快掘进速度，取得了较理想的效果。
• The application of smoothwall blasting in crushed surrounding rock of no . 2 tunnel with crushed surrounding rock has obtained more satisfactory results through selecting rational blasting parameters , adopting right supporting method and controlling the overbreak or underbreak of the tunnel effectively , etc
  在周家山2号隧道破碎围岩施工中，应用光面爆破技术，通过选择合理的爆破参数，正确的支护施工方法，有效地控制隧道的超欠挖，加快掘进速度，取得了较理想的效果。