文档介绍：Engineering 4 (2018) 167–169
Contents lists available at ScienceDei District, and confined water head. Construction is being carried out by a com-
Shinan District). It is a rail transit line that connects the east-coast bined mining tunneling and shield method; the tunnel sections
downtown area with the north-coast area of Qingdao City, and constructed using the mining tunneling method are jointed under
radiates out to peripheral clusters. the sea with those constructed using the shield method. The
With a full length of about km (including an undersea sec- undersea tunnel section constructed using the mining tunneling
tion of about km), the undersea tunnel on Qingdao Metro Line method is 2532 m long, and is provided with a composite lining;
8 runs from Dayang Station in the Hongdao Economic Zone of the undersea tunnel section constructed using the shield method
Qingdao City and passes under Jiaozhou Bay to reach Qingdao is 2965 m long and uses two composite slurry balance shields with
North Railway Station in Licang District, Qingdao; it is the longest diameter of m (Fig. 1).
undersea metro tunnel in China. To meet operation needs in this To accomplish const