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| Study on Construction of Subsurface Excavated Metro Tunnel Under －passing Existing Railway |
| LIN Yun － hong，LI Yi － wei，WANG Fei |
| Xi'an University of Science and Technology，Xi'an，Shanxi 710054，China |
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Abstract Research purposes: Construction of the metro tunnel under － passing the existing railway is related to the railway traffic safety and the metro construction safety． So the more attention is paid to such construction． In this paper，taking one subsurface excavated metro double track tunnel with shallow part as an example，the three － dimensional numerical calculation was made for the designed construction order and construction technology with the ANSYS calculation software，and the analysis was made for the stratum settlement and its distribution．
Research conclusions:The analysis showed the internal force in the stratum caused by the tunnel construction was redistributed and this was the reason for the ground settlement． However，the train load had bigger influence on the ground settlement． The numerical calculation could provide the important basis for selection of the construction measures．If the grouting was conducted to the railway subgrade before construction or the grouting was conducted through the sleeve valve bedded on both sides of the subgrade，the settlement deformation could be controlled．
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Received: 14 May 2012
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Huang Shuzhen，Hu Renxi，Dang Shiyan．Ansys12．0 Civil Engineering Finite Element Analysis from Approaches to Master［M］．Beijing: China Machine Press，2010．
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Li Wei．The Tunnel and Underground Engineering Ansys Case Analysis［M］．Beijing: China Water Power Press，2007．
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Yu Caigao．The Safety Meatures on Subway Shield Tunnel in the Following of Railway［J］．City Track Traffic，2009(4) :33－36．
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2012, Vol. 29 
