摘要
首都机场线二期(西延)工程全线采用非降水暗挖法施工,地下水治理由"以降为主"改为"以堵为主、堵疏结合、综合治理"。采取全断面深孔注浆堵住地下水,初支背后回填双液浆截住背后回流水,洞内减压井及地面渗井"疏"导前面层间水、微承压水等技术手段筑起区域防线,将地下水疏导、引流至影响区域外地层,将地下水对暗挖工程的影响降到最低,实现了掌子面开挖有序、安全可控。
Non-dewatering mining construction method was adopted along the full line of capital airport line phaseⅡ(west extension)project and groundwater treatment concept was changed from"taking dewatering as the main method"into"taking water-stop as the main method cooperated with drainage and comprehensive treatment".Various technical measures were adopted,such as full crosssection deep-hole grouting method to stop groundwater,initial support behind backfill double mortar to cut off backwater,pressure relief well in hole and ground leaching well to drain the water between front layer,as well as micro pressure water measure,etc.,to build a regional defense line,to drain the groundwater to the stratum outside the influencing area,to minimize the influence of groundwater on mining excavation project and to realize smooth,safe and controllable tunnel heading excavation.
作者
张东
张志强
杜明山
ZHANG Dong;ZHANG ZN-qiang;DU Ming-shan(Beijing Construction Engineering Group Co.,Ltd.,100055,Beijing,China)
出处
《建筑技术》
2020年第7期796-799,共4页
Architecture Technology
关键词
非降水暗挖
注浆止水
洞内疏排
non-dewatering subsurface excavation
grouting water-stopping
in-hole drainage
