陡峻峭壁位置隧道出洞施工技术

Construction Technology of Tunnel Exit in Steep Cliff Location

主要对复杂环境下的陡峻峭壁位置隧道出洞施工进行总结。针对围岩较好情况,出洞段采用"上下台阶+分次爆破,台阶爆破为先下后上,逐层推进"的技术,贯彻了"早进洞、晚出洞""零开挖"的理念,保证了隧道施工的安全、经济、合理。

This article mainly summarizes the construction of the tunnel exit in steep cliff location in complex environment. The exit section of the tunnel adopts the technology of ＂upper and lower steps ＋ staged blasting, bench blasting is first down, then up, progressively advancing＂,which implements the concept of ＂early entry, late exit＂ and ＂zero excavation＂ and ensures the safety, economy and rationality of tunnel construction.