浅埋隧道穿越泥石流沟关键技术

The key technology of shallow buried tunnel through the debris flow gully

为有效的控制浅埋段的围岩变形,将浅埋段开挖方法由两台阶改为三台阶七步法,并缩小施工步距;明洞段(泥石流沟)地质为砂质黄土,大开挖可能会导致边坡的坍塌和滑坡,将明洞段采用半挖方式和明洞暗作,为以后过泥石流段隧道施工积累了经验。

In order to effectively control the surrounding rock deformation of shallow buried section, this paper made the shallow section excava- tion method to three steps seven steps by two steps, and reduced the construction step, the open cut tunnel section （debris flow gully） geological was sandy loess, the large excavation may lead to slope collapse and landslide, made the open cut tunnel section using semi-incomplete cut meth- od and dark operation in open tunnel, accumulated experience for later tunnel construction of debris flow section.