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| Analysis of Surrounding Rock Displacement of Subaqueous Tunnel with Complex Geological Condition |
| XIANG Xiao － hui1，WANG Li2，LI Chun － guang3 |
| 1． China Railway Siyuan Survey and Design Group Co． Ltd，Wuhan，Hubei 430063，China; 2． The Third Institute of Water Transport Engineering ，CCCC Second Harbor Consultants Co． Ltd，Wuhan，Hubei 430071 China; 3． Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China |
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Abstract Research purposes: The Liuyanghe Tunnel in Changsha is a bi － way and four － lane tunnel with complex structure and it is composed of a small － distance tunnel，split tunnel and cut － cover tunnel． The monitored results of settlement and convergence of surrounding rock in subsurface excavated area and the analyses of the measures taken in construction and the procedures of tunnel excavation of Liuyanghe Tunnel can be as the reference to construction of the subaqueous tunnel in Changsha．
Research conclusions: The research results show if the measuring point is embed after excavation of core soil，the losses settlement is large． The full － face curtain grouting can be used to reinforce the surrounding rock to achieve better control of the vault settlement of the tunnel． The removal of temporary support has small impact on the displacement of surrounding rock． Using the three bench method and center diagram method to construct the subaqueous tunnel ，the displacement of surrounding rock canbe controlled well．
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Received: 30 December 2010
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2011, Vol. 28 
