ABSTRACT
Since there is a big water-eroded groove in excavation of tunnel, the choice of traversing method becomes critical. In practical tunneling engineering, the existence, location and size of water-eroded groove is difficult to be judged because of the limitation of geologic investigation, so relevant traversing method according to the actual condition is only when the problem happens instead of a design special for big water-eroded groove. This way is available to single tunnel because of its simple structure. However, to double-arch tunnel, a special design is necessary, considering the difficulty in the excavation caused by the complicated structure and more important, the influence to the stability by the construction.
