盾构法施工中砂层进洞段降水设计与施工  

Water Level Lowering Design and Construction at Shield Tunneling Entrance in Sand Stratum

作　　者：刘广仁[1] 常喜平[1] 寇宝庆[1] 安冬云[1] 李应辉[1] 

机构地区：[1]中国石油天然气管道局,河北廊坊065000

出　　处：《石油工程建设》2012年第1期36-38,85,共3页Petroleum Engineering Construction

摘　　要：西气东输二线长江盾构隧道穿越工程采用AVND3080泥水平衡式盾构机施工,盾构机进洞段地质条件复杂,属粉质黏土和细砂地层。细砂层具有中、强透水性,给盾构机进洞带来很大的威胁。经多方案比选论证,采用深井降水方案疏干盾构机进洞段地下水,达到盾构安全进洞的目的。AVND3080 slurry balanced shield machine is used in the Yangtze River tunnel construction of the Second West to East Gas Pipeline Project.The geological condition at the shield tunneling entrance is complex and belongs to silty clay and fine sand stratums.The strong permeability of sand stratum imperils the shield machine when it enters into hole.Through the comparison and discussion for several schemes,the scheme of water level lowering with deep wells is adopted to drain the underground water at the shield tunneling entrance and thus to ensure safety of the shield machine.

关 键 词：盾构施工 砂层 深井降水 降水设计 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]