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| Underground Barriers Clean － up Technology for Subway Shield Tunnelling Based on Ground Frozen Method |
| ZHOU Cheng1，WANG Cheng － shan2，LI Yong － jun2，GUO Pu1 |
| 1． Huazhong University of Science ＆ Technology，Wuhan，Hubei 430074，China; 2． China Railway Tunnel Group Co． Ltd，Luoyang，Henan 430074，China |
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Abstract Research purposes: There are various underground barriers in subway tunnel construction，which need be emoved efficiently and in time． Based on the river － crossing subway tunnel section of Line No． 2 of Wuhan Metro，this paper systematically introduced the underground barriers clean － up technology for subway shield tunnelling by artificial ground freezing method． Then，it discussed the safety issues of cleaning － up barriers with pressure by artificial ground freezing method from the stability of frozen soil and the impact on the surrounding environment． As its complex geological conditions and surrounding environment，underground barriers clean － up easily lead a great impact on the surrounding environment due to its high risks，so it is important for us to choice correct method to clean up underground barriers．
Research conclusions: The key of the underground barriers cleaning － up technology by artificial ground freezing method is the closure and quality of the frozen soil． After the frozen soil temperature is at － 10 ℃ ，the underground barriers was cleaned up successfully，and the heave and melt effect in the soil was controlled within ± 6mm． It provided an effective control of the construction safety risks，and reduce the effect to the construction environments，which gives a good benefit to other similar construction projects．
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Received: 12 November 2012
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2013, Vol. 30 
