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| Research on Ground Reinforcement for Replacing Cutters for Long － distance and Large Diameter Shield Driving in Pebble Layer |
| TANG Wei，ZHANG Ji － qing，WU Shao － yang |
| he Third Railway Survey and Design Institute Group Corporation，Tianjin 300251，China |
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Abstract Research purposes: The long － distance and large diameter shield driving in the pebble layer is a worldwide problem in the shield driving． A 12m diameter shield machine was used for one project and driving 5． 2km was realized by one cutter head． When the shield machine drove in pebble layer，its cutters and cutter head were abrased seriously． So the place of stopping the shield machine was planned for checking and replacing the cutters and cutter heads． In order to make sure the safety of whole project，it was necessary to research the corresponding measures for reinforcing the ground surface for replacing the cutters of the shield machine．
Research conclusions: No matter entering the chamber under the working pressure or under the normal pressure，it was necessary to take the corresponding ground reinforcement measures to improve the stability and compactness of the stratum around the shield machine for guaranteeing the safety of construction． When entering chamber under working pressure for replacing the cutters，the back grouting could be used step by step for reinforcing the ground surface． When entering chamber with normal pressure for replacing cutters，the drilled pile could be used along with grouting between piles for reinforcing the ground surface．
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Received: 04 November 2011
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GB 50446—2008，Code for Construction and Acceptance of Shield Tunnelling Method ［S］．
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Zhou Wenbo． Shield Tunnelling Technology ［M］．Beijing: China Architecture＆ Buhilding Press，2004．
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Peng Feng，Liu Guang Jun． Research on Sleeve － valve －pipe Grouting Technology for Reinforcing the Pearl River Dam Underpassed by Shiziyang Tunnel ［J］．Journal of Railway Engineering Society，2010( 7) : 55 －58．
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The Third Railway Survey and Design Institute． The Shield Designation of Beijing ＇s Underground Diameter Line Project［R］． Tianjin: The Third Railway Survey and Design Institute ，2010．
［6］ 中铁隧道集团北京地下直径线工程项目部． 北京直径线盾构隧道施工组织设计［Z］． 洛阳: 中铁隧道集团北京地下直径线工程项目部，2010．
China Railway Tunnel Group，Department of Beijing＇s Underground Diameter Line Project． Shield Tunnel Construction Organization of Beijing ＇s Underground Diameter Line Project［Z］． Luoyang: China Railway Tunnel Group，Department of Beijing ＇s Underground Diameter Line Project，2010．
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2012, Vol. 29 
