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How to ensure the existing tunnel s safety and the train normal running while the electric railway multiple line tunnel was blast boring? By study and practice,the paper gives an answer through stepped digging method,underholing style,holes scatter and the structure of the hole and detonation technology.

針對電氣化鐵路二線隧道爆破掘進如何確保既有線隧道的安全與行車正常運行的問題,文章介紹了分步開挖方法,從掏槽形式、炮眼分布、炮眼裝藥結構以及起爆技術等角度回答并很好地解決了這一問題,并在實踐應用中取得了很好的技術效果與明顯的社會效益與經濟效益,為類似工程提供了成功經驗。

V-shape cutting,non-electric millisecond detonating network and multiple-raw holes were employed in the blasting large-area rocks,and smooth blasting was conducted so as to maintain the slope stabilizatio.

試驗采用寬孔距、小抵抗線,并固定排距、調整間距的炮孔布置方法,降低了復雜地形條件下炮孔布置難度;并采用V形掏槽、非電微差起爆網路、沿路基中心線對稱起爆的中深孔方式開挖集中土石方,邊坡保護采用光面爆破技術。