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| Research on the Construction Control and Numerical Simulation of the Existing Civil Air-defence Tunnel Reconstruction |
| LIU Ming-hui1,YIN Ai-guo2, GUO Wei2 |
1.North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045,China;
2. China Railway Seventh Group Co. Ltd,Zhengzhou, Henan 450016,China |
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Abstract Research purposes:The existing civil air defense tunnel reconstruction gets few examples in China. This paper relies on monitoring measurement technology and the theory of finite element analysis, studies the displacement, deformation, and stress characteristics on different stages of dynamic tunneling during the single and bilateral excavation. We improved construction plan, strengthened the construction process control, and compared the numerical simulation results with site measures to ensure the safety of tunnel reconstruction.
Research conclusions:(1) The main parameters such as the maximum ground settlement caused by unilateral and bilateral excavation and the stress of surrounding rock meet the code and design requirements. This shows that the construction scheme is reasonable. (2) The rock structure experiences a trend of decreasing tensile stress and increasing compressive stress with the excavation. The maximum tensile stress of the rock structure drops dramatically as the initial support and temporary support. The maximum compressive stress increases dramatically when the top structure is excavated. (3) A two-meter single side excavation of the existing structure is followed by a ground surface sedimentation of 15.10 mm while a one-meter bilateral excavation expects a ground surface sedimentation of 23.67 mm, which is very close to the designed warning value (24 mm) and shall be strictly controlled during the construction. (4) This paper presents the construction methods and measures such as temporary vertical advance reinforcement, side wall and invert, radial grouting, supported by pipe shed, excavation and so on, which can make the internal force change under control, control the displacement of vault, the inverted arch and surface effectively, and ensure the safe of structure and construction. (5) This paper summarizes the deformation rules of surrounding rock, surface, liner structure and so on, which can provide references for the design and construction of similar projects.
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Received: 22 September 2014
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[1] 王梦恕.降低城市地铁造价的措施和意见[J].铁道工程学报,1996(增刊1):12-14.
Wang Mengshu.Measures and Suggestions to Reduce the Cost of Urban Subway[J].Journal of Railway Engineering Society,1996(S1):12-14.
[2] 李佳翰,朱晃葵,卓孟慧,等.既有隧道扩挖及改建技术探讨[J].隧道建设,2011(增刊1):358-364.
Li Jiahan,Zhu Huangkui,Zhuo Menghui,etc. Study on Enlarging and Reconstruction Technology of Existing Tunnel [J].Tunnel Construction,2011(S1):358-364.
[3] 杨峥.既有人防隧道改造为地铁区间的施工力学行为研究[J].铁道标准设计,2012(3):69-72.
Yang Zheng.Study on Mechanical Behavior of Construction in Transforming the Existing Air Defence Tunnel into Metro Tunnel[J]. Railway Standard Design,2012(3):69-72.
[4] 方勇,何川.平行盾构隧道施工对既有人防工程影响的数值分析[J].岩土力学,2007(7) :1402-1406.
Fang Yong, He Chuan. Numerical Analysis of Effects of Parallel Shield Tunneling on Existent Tunnel[J]. Rock and Soil Mechanics,2007(7) :1402-1406.
[5] 任建喜,李庆园,郑赞赞,等. 盾构诱发的地表及邻近建筑物变形规律研究[J]. 铁道工程学报,2014(1):69-74.
Ren Jianxi,Li Qingyuan,Zheng Zanzan. Research on the Deformation Laws of Surface and Adjacent Building Induced by Shield Tunnel[J]. Journal of Railway Engineering Society,2014(1):69-74.
[6] 王勖成,劭敏. 有限单元法的基本原理与应用[M]. 北京:清华大学出版社,1997.
Wang Xucheng,Shao Min. Principle and Application of Finite Element Method[M]. Beijing: Tsinghua University Press,1997.
[7] 王元汉, 李丽娟, 李银平. 有限元法基础与程序设计[M] . 广州:华南理工大学出版社, 2001.
Wang Yuanhan,Li Lijuan,Li Yinping. Finite Element Method and Program Design[M]. Guangzhou:South China University of Technology Press, 2001.
[8] Chen W F. Structural Stability: from Theory to Practice [J].Engineering Structures, 2000(22):116-122. |
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2014, Vol. 31 
