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北京首都国际机场T3-T2航站楼之间的单层双跨连拱浅埋暗挖大断面隧道垂直下穿机场跑道,采用超长管幕法施工,为国内首次。通过对隧道施工地表变形进行分析,得出如下结论:新建隧道施工地表最大沉降平均为9.28mm,控制变形情况良好,采用超长管幕保护浅埋暗挖施工技术切实可行;3个断面变形拟合得到的确定调节系数平均为0.951,地表变形符合Peck公式;变形拟合得到的K值平均为1.903,为北京地区常规数值的3~6倍,管棚的存在对新建隧道施工引起的地层变形具有阻隔及扩散作用;变形拟合得到的Vl值平均为0.201%,略低于北京地区常规施工方法水平。研究成果可为类似工程提供借鉴及参考。
The single-storey, double-deck, multi-arch, shallow-buried tunnel with large cross-section between T3 and T2 terminals at Beijing Capital International Airport runs vertically through the airport runway and is constructed by the super long pipe curtain method, which is the first time in China. Through the analysis of the surface deformation of the tunnel construction, the following conclusions are drawn: The maximum surface settlement of the new tunnel construction is 9.28mm on average, and the control deformation is in good condition. It is feasible to adopt the super-long pipe curtain to protect the shallow- The average value of the adjustment coefficient obtained is 0.951, and the deformation of the ground surface accords with Peck’s formula. The average K value of the deformation fitting is 1.903, which is 3 ~ 6 times of the conventional value in Beijing. With barrier and diffusion. The Vl values obtained by the deformation fitting average 0.201%, slightly lower than the conventional construction methods in Beijing. The research results can provide reference and reference for similar projects.