对于大断面软岩隧道施工,常规的台阶法开挖,极易造成拱顶大面积暴露、松动导致坍塌,此类情况均采用双侧壁导坑法设计.双侧壁导坑法开挖断面能够最大限度的保证施工安全,适合应用于大断面软岩隧道.%For large cross-section of soft rock tunnel construction, the conventional excavation by using bench cut method easily caused the a large area exposure, loose, and even collapse. Excavation by using double side drift method can insure construction safety and is suitable for large cross-section of soft rock tunnel.
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