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单侧壁导坑施工法的原理是通过中隔壁(临时支撑)将大断面隧道分割成跨径较小的导坑施工,施工时采用“短进尺、强支护,早封闭、勤量测”的施工原则,使大跨径黄土隧道安全、稳步的向前施工。主要应用与跨径大、围岩破碎Ⅴ级围岩(黄土)隧道。结合工程实例,介绍单侧壁导坑法在黄延高速公路扩能工程王村隧道施工中的应用。
The principle of construction method of single-side wall guideway is to divide the large-section tunnel into small-span guide holes by temporary partition in the middle wall (temporary support), and adopt “short ruler, strong support, early closure, ”Construction principles, so that large-diameter loess tunnel safe and steady forward construction. The main application and large span, rock broken Ⅴ grade rock (loess) tunnel. Combined with the engineering example, the application of single-side-wall pilot pit method in Wangcun tunnel construction of Huang-Yan Expressway expansion project is introduced.