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| Research on the Deformation Law of Deep Foundation Pit of Metro Station in Xi＇an by FLAC Simulation |
| REN Jian － xi，ZHANG Yin － he，ZHANG Kun，GAO Bing － li |
| Xi＇an University of Science and Technology，Xi＇an，Shanxi 710054，China |
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Abstract Research purposes: Xi＇an is the first city to build the urban metro in loess area in the northwest area in China． The deep foundation pit of metro station has the following features: big excavation plane size，long exposure time of foundation pit and high grade of controlling the foundation deformation． And Xi＇an is in the special loess area，and the rock － soil mass of the foundation wall is mainly of loess and loess － like soil with the collapsibility on the top，so Xi＇an is big different in geology from the city where metro station have been built at home and abroad，and there is little experience of supporting design of deep foundation pit of metro station to learn． Thus，it is necessary to do the research on the deformation law of deep foundation pit of metro station for the purpose of offering helps to design and optimize the supporting structure of the foundation pit of other metro stations in Xi＇an．
Research conclusions: The simulation of the on excavation process of the deep foundation pit of Beidajie Metro Station of Line 2 of Xi＇an metrol was made with FLAC software to work out the monitoring plan of the deep foundation pit of the station． The analysis of the horizontal deformation of the retaining piles，the axial force changes of steel support，the change law of load bearing of the cables was made． The results showed that the displacement of pile directly reflected deformation characteristics of the retaining structure，while the steel support and cables obviously limited the deformation of foundation pit． The calculation results was basically in accordance with the monitoring results．
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Received: 15 January 2011
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2011, Vol. 28 
