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中铁十五局集团成贵铁路项目部(以下简称项目部)承建的成贵铁路13标段工程地处云贵高原的乌蒙山区,为高原溶蚀低丘地貌,地势起伏很大,沿线地质条件极为复杂。不良地质主要有岩溶、煤层瓦斯、采空区、断层破碎带及危岩落石等,隧道围岩条件差,桥隧比例高达75.3%,施工中存在塌方、突水、突泥、高空坠落、瓦斯爆炸等风险。其中,大方隧道岩
China Railway 15th Bureau Chengguang Railway Project Department (hereinafter referred to as the project department) Chengguang Railway 13 tenders project is located in the Wumeng Mountain Plateau of Yunnan-Guizhou Plateau, erosion of lowland landscape plateau, the ups and downs of the terrain, the geological conditions along the very complex. Bad geology includes karst, coal seam gas, goaf, fault fracture zone and dangerous rockfall. The surrounding rock of the tunnel is in poor condition, with the ratio of bridge and tunnel reaching as high as 75.3%. There are landslides, water inrush, mud, falling at height, Explosion and other risks. Among them, generous tunnel rock