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| Application of Freezing Method in Reinforcing Soil on Shield Ends |
| MIAO Li － xin1，QI Xiu － dong2，ZOU Chao3 |
| 1． Zhengzhou Metro Co． Ltd，Zhengzhou，Henan 450000，China; 2． Henan Polytechnic University，Jiaozuo，Henan 454000，China; 3． The 4th Engineering Co． Ltd，China Railway First Group Co． Ltd，Xianyang，Shanxi 712000，China |
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Abstract Research purposes: In the process of shield construction of metro，the end area is the place where the shield machine departs and arrives and where the accidents easily happen． The reinforcement of the end area is crucial to the departure and arrival safety of the shield machine ． In the loose unstable alluvial layer，the water － containing rock layer with the pore development，the slush layer，the soft mud stone layer，the saturated layer and the layer with high water head，how to well use the freezing method and conducting the reinforcement monitoring are the key elements to guarantee successful construction of shield tunnel．
Research conclusions: The difference between reinforcing the soil on the ends with freezing method and reinforcing the ordinary foundation is that the former has the requirement of the freezing temperature． Only when the freezing temperature is guaranteed can the soil strength on the ends be guaranteed and the risks of sand and water bursting be effectively controlled． In order to avoid the appearance of accident，the relative measures should be taken such as using small propulsive force，slow cutting and avoiding the freezing of the cutter head when the shield machine passes through the soil on ends．
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Received: 08 May 2011
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［1］ 杨平，袁云辉，余才高，等． 南京地铁集庆门盾构隧道进洞端头人工冻结加固温度实测［J］． 解放军理工大学学报 ( 自然科学版) ，2009( 6) : 591 －596．
Yang Ping， Yuan Yunhui， She Caigao， etc． Temperature Study on Artificial Soil Freezing Reinforcement for Shield Entry in Ji Tsing － men Station of Nanjing Metro ［J］． Journal of PLA University of Science and Technology ( Natural Science Edition) ，2009( 6) : 591 － 596．
［2］ 李大勇，王晖，王腾． 盾构机始发与到达端头土体加固分析［J］． 铁道工程学报，2006( 1) : 87 －90．
Li Dayong，Wang Hui，Wang Teng． Analysis of Soil Reinforcement for the Starting and Arriving of Shield Machine in Metro Construction［J］． Journal of Railway Engineering Society，2006( 1) : 87 － 90．
［3］ 王效宾，杨平，张婷，等． 盾构出洞水平冻结解冻温度场三维有限元分析［J］． 解放军理工大学学报( 自然科学版) ，2009( 6) : 586 －590．
Wang，Xiaobin，Yang Ping，Zhang，Ting，etc． 3 － D Finite Element Analysis of Melting Temperature Field in Shield Tunneling Horizontal Freezing Reinforcing Engineering［J］． Journal of PLA University of Science and Technology ( Natural Science Edition) ，2009 ( 6 ) : 586 － 590．
［4］ GB 50299—1999，地下铁道工程施工及验收规范［S］．
GB 50299—1999，Code for Construction and Acceptance of Metro Engineering［S］．
［5］ DG/TJ 08—902—2006，旁通道冻结法技术规程［S］．
DG /TJ 08—902—2006，Technical Code for Bypass Freeing Method［S］．
［6］ 曹红林． 地铁隧道冻结法施工融沉控制方案及实施［J］．地下空间与工程学报，2010( 2) : 387 －390．
Cao，Honglin． Thawing Settlement Control of Subway Tunnel Construction by Arti6ciaI Ground Freezing［J］． Chinese Journal of Underground Space and Engineering，2010( 2) : 387 － 390．
［7］ 鲍永亮，郑七振，唐建忠． 地铁隧道旁通道冻结法施工监测分析［J］． 铁道工程学报，2009( 3) : 93 －95．
Bao Yongliang， Zheng Qizhen， Tang Jianzhong． Monitoring Analysis of Construction for Connecting Aisle in Metro Tunnel with Freezing Method ［J］． Journal of Railway Engineering Society，2009 ( 3) : 93 －95.
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2011, Vol. 28 
