在钻爆法掘进隧道时,严重的超欠挖将影响隧道的施工成本和长期安全稳定,然而,钻爆法掘进隧道的超欠挖又是不可避免的,但是通过采取一些措施,可以将超欠挖值控制在一个较小的水平.本文在分析和总结超欠挖产生的原因及其危害的基础上,结合兰州南绕城高速公路建设项目实际,就如何加强隧道超欠挖控制,减少混凝土超方进行了深刻的原因分析且提出了具体对策,以便指导现场施工.%In the drilling and blasting excavation of tunnels, serious overbreak will affect the construction cost of the tunnel and the long-term safety and stability. However, it is inevitable on the drilling and blasting excavation of tunnel overbreak, but the overbreak value is controled at a smaller level by taking some measures. The author has analyzed and summarized in the dig over the cause and harms, and made a deep super concrete reason analysis on how to strengthen the tunnel overbreak control and reduce the party by combing Lanzhou south highway construction project,and put forward countermeasures to guide the construction site.
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