连拱隧道是山区高速公路设计中经常遇到的一种特殊隧道结构型式 ,通过近几年的设计、施工研究分析 ,其建设的关键技术主要为中墙的设计、施工及洞内外线性的过渡方式等。针对不同的中墙型式 ,从施工安全、结构受力、连拱隧道的过渡方式、防排水效果等方面进行对比 ,提出了各种中墙型式及其适用条件 The multi-arch tunnel is a special type of tunnel structure often encountered in the design of mountainous expressways. According to the research and analysis of the design and construction in recent years, the key technologies for the construction of the multi-arch tunnel are mainly the design and construction of the middle wall and the linear transition inside and outside the tunnel Way and so on. According to the different types of the middle wall, this paper compares the construction safety, the force of the structure, the transition way of the multi-arch tunnel, the effect of drainage and drainage, and puts forward various types of the middle wall and their applicable conditions