Chinese Longest Sea-crossing Metro Tunnel:Wuyuan Bay Station-Liuwudian Station Section of Xiamen Metro Line#3

摘要

Project significance Xiamen metro Line#3 runs from Xiamen Railway Station to Xiangran Airport.It is the southwest-northeast trunk line that connects the main island and the subcentre in the eastern regions(Xiangran District).The Wuliu Section(the sea-crossing section from Wuyuan Bay Station to Liuwudian Station)is the main engineering feat of the metro line due to its high construction difficulty and tight schedule.As one of the earliest sea-crossing metro tunnels constructed in China,this project represents significant engineering achievements and innovations.The plane view of Wuliu Section is shown in Fig.1.2 Brief introduction of the project 2.1 Design overview The Wuliu Section of Xiamen Metro Line#3 crosses the Xiamen east sea area and connects the main island with Xiangran Dis trict.It is to the northwest of the Xiangran subsea tunnel.The total length the section is 4.95 km,including about 3.6 km of sea-crossing section.The maximum water depth is 25 m and the maximum buried depth of the tunnel is 69 m.It adopts a single-line,dual-bore section and uses the combined M mining method-shield method"construction technique.There are one inclined construction shaft,one air shaft,ten service channels,three wastewater pump houses and one power substation.The plane view of the tunnel is shown in Fig.2.