浅论湿陷性黄土隧道的施工方法

通过对黄土地质的形成年代、塑性指数等的详细分析，介绍了黄土地层对隧道施工的主要影响因素，并通过忻保高速第二十一合同段内的单位工程在沙塔隧道施工中所采用的环形导坑短台阶法，说明本法从施工安全、施工进度、施工质量上都可以达到比较满意的效果。

On construction method in collapsible loess tunnel

According to the detailed analysis of the formation time and plasticity index of the loess geology,the paper introduces the loess layer's main influential factors for the tunnel construction,and indicates the construction safety,the construction process,and construction quality can be achieved according to the short bench cut ring heading method in Shata tunnel in the project of the twentieth contract section in Xin-Bao expressway.