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| China Railway First survey and Design Institute Group ,Ltd，Xi'an Shanxi710043,China |
| WANG Tian-ming |
| China Railway First survey and Design Institute Group ,Ltd，Xi'an Shanxi710043,China |
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Abstract Research purposes:A large span three- arch tunnel underpays five- floors building is formed when a connecting line to depot beside the two main lines In the tunnel between Andemen station and Ningdanlu station of Nanjlngmetro .For construction of it, the design is complex,there are many construction steps and construction procedure changes frequently .The most important thing is the safety of excavation and the five- floors building .The Divisional excavation construction is usually adopted for free- arch tunnel but different methods o f excavation and Lining process have different influences on strata and upper building,so it is necessary to do research on the order of construction process for the purposes of guaranteeing the construction safety and reducing the influence on the building.
Research conclusions :Trough making simulation analyses of 5 construction schemes for three一arch tunnel and comparing the strata settlements and structure internal force of each scheme the result shows that the scheme of "mid- pilot tunnel excavation,side tunnel in advanced and then constructing middle tunnel”is the best scheme compared with the other scheme such as the scheme o f”side tunnel excavation, the mid- pilot tunnel excavation then Side tunnel lining and finally constructing the main tunnel", Using this method ,the strata and upper building have least settlement and the support structure has least inner force.
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Received: 20 June 2008
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[1]GB 50157- 2003地铁设计规范[S]
[ 2]南京地铁1号线南延安德门~宁丹路区间施工图[Z]. 兰州：中铁第一勘测设计院，2007
[3]复杂工程环境下隧道施工洞室稳定及结构检算报告 [R].石家庄:石家庄铁道学院，2007.
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2008, Vol. 25 
