大跨度浅埋式导流洞进口渐变段一次支护设计与施工——以糯扎渡水电站2号导流洞为例

Large-span shallow embedded diversion tunnel inlet reducing section primary support design and construction——with Nuozhadu Hydropower Station No.2 diversion tunnel as an example

随着我国水电建设的发展,大跨度导流洞在水电工程中越来越多,其中埋藏较浅的大跨度导流洞进口渐变段存在着较大安全隐患。本文以糯扎渡水电站2号导流洞为例,对该部位的开挖支护设计与施工方案进行了研究,对类似工程具有重要的参考和借鉴价值。

Large span diversion tunnel is more and more applied in hydropower projects with the development of hydropower construction in China,wherein shallow embedded large-span diversion tunnel reducing section has larger safety hidden danger. In the paper,Nuozhadu Hydropower Station No. 2 diversion tunnel is adopted as an example for studying excavation support design and construction plan in the part,thereby it has important reference value for similar projects.