Abstract:

Doublearched tunnels, which have been adopted in highway works in recent years, have great difference from singlearched tunnels in respect of tunnel structures. Therefore, it is of great significance to understand the key points of doublearched tunnels and to learn from relevant experience and lessons so as to grasp the construction technology of doublearched tunnels. Taking the doublearched tunnels on YuanMo highway and SiXiao highway as example, the article expatiates on the structural features, central drift excavation method, threedrift excavation method, lining construction and some special issues of doublearched tunnels.

Key words: doublearched tunnel construction technology central drift method  , threedrift method