Abstract: Excavating and exiting tunnel are the most complicated sites in the tunnel construction condiuons , while they are also the site of the most hidden dangerous in quality and safety . If we properly choose the plan of excavating tunnel , have the aid of some subsidiary construction measures and excavate naturally tunnel , we can effectively avoil the unstability of the mountain slope evoked by brushing slope arid pulling slot . consumedly decrease the engineering construction cost of turuiel protection protect ecosystem environment .

Key words: highway , tunnel , excavating tunnel plan

摘要： 进洞、出洞是隧道施工工况最复杂,也是质量、安全隐患最多的地段.合理选择进洞方案,借助一些辅助施工措施,自然进洞,能有效避免刷坡拉槽引发的山体边仰坡失稳,大大降低洞口防护工程建设成本,保护生态环境.

关键词: 公路, 隧道, 进洞方案