大瑶山隧道九号断层平行导坑施工中,在DK1994+815地段,遇到一罕见的大突水坍方,坍石压塌了巷道8米的箱架,整个坍体为断层堆积碎块石,涌水量每昼夜达8000立方米,面对此特殊情况,沿用过去处理坍方办法是显然不行的。经现场研究,决定采用在导坑顶上打密集长管棚通过的办法。 Dayaoshan tunnel on the 9th parallel construction of the fault, DK1994 +815 lots encountered a large sudden collapse of the collapse, the collapse of rock collapse of the roadway 8 meters of the box, the entire slump for the accumulation of fragments of rock fragments , The inflow of 8000 cubic meters per day and night, in the face of this special case, the use of the past to deal with landslip approach is obviously not work. After field research, decided to use the top of the pit to fight the intensive long shed through the approach.