The subsea tunnel engineering that lies at Jiaozhou Bay in Qingdao is introduced, as well as the research status of little distance parallel tunnels in China.
介绍青岛胶州湾湾口海底隧道的工程概况和国内小间距隧道的研究现状。
The approaching construction for two neighboring parallel tunnels in the numerous underground projects is the most normal and basic type in the development of underground space in city.
在众多地下工程的近接施工中，相邻两孔平行隧道的近接施工是城市地下空间开发中最常见和最基本的近接类型。
The approaching construction for two neighboring parallel tunnels in the numerous underground projects is the most normal and basic type in the development of underground space in city.
在众多地下工程的近接施工中，相邻两孔平行隧道的近接施工是城市地下空间开发中最常见和最基本的近接类型。
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