富水流砂地层中下穿立交桥及燃气管线隧道围岩变形控制技术  

Deformation Cotrol Techniques for Surrounding Soils of a Subway Tunnel Under-passing Flyover Bridges and Gas-pipe Lines in Water-soaked Quick Sand Stratum

作　　者：邓稀肥[1] 陈寿根[1] 张恒[1] 王靖华[1] 

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《现代隧道技术》2010年第4期101-107,共7页Modern Tunnelling Technology

摘　　要：深圳地铁四号线里程K9+125～K9+255段为富水流砂地层,该段隧道穿越立交桥群,与摩擦桩最小近接距离为5.46 m,且多条管线穿越隧道上方,隧道围岩变形控制要求极高,施工风险大。结合该隧道施工研究,总结了袖阀管联合钢管注浆加固桥桩技术、地面旋喷分仓止水帷幕结合洞内管棚和小导管注浆控制围岩变形技术、掌子面封堵技术、CRD法隧道开挖技术和排水技术等施工技术体系。其研究结果对国内同类施工条件下的工程施工具有一定的借鉴意义。Subway tunnel between mileages K9＋125 and K9＋255 on Shenzhen subway Line 4 is embedded in water-soaked quick-sand stratum,and it underpasses flyover bridges with the minimum distance of 5.46 m between the tunnel and friction piles,with many pipelines passed over it.Tunnel construction faced a big risk and surrounding soil deformation must be minimized.Considering the features of this project,this paper studied and summarised technologies including friction piles strengthened by sleeve-valve tube grouting and pipe-shed sup-port,two-phase surrounding soil deformation control through high pressure rotating-jet-grout water-stop curtains conducted on ground surface and pipe-roofing and small pipe grouting performed inside the tunnel,tunnel face plugging,CRD excavation method,drainage etc.The study is of help to similar underground projects.

关 键 词：地铁隧道 富水流砂地层 桥桩加固 管线保护 围岩变形控制 

分 类 号：U457.3[建筑科学—桥梁与隧道工程]