地铁暗挖竖井深孔注浆止水施工技术研究

RESEARCH ON THE CONSTRUCTION TECHNOLOGY OF DEEP HOLE GROUTING AND SEALING WATER OF UNDERGROUND EXCAVATED VERTICAL SHAFT

针对承压水粉细砂地层竖井施工发生流水涌砂及坍塌的难题,采用深孔注浆止水帷幕代替人工降水。通过对注浆帷幕的设计以及增加预防竖井侧壁滑塌的棚盖措施,有效阻隔了竖井开挖过程中的地下水,满足暗挖施工无水作业的条件。

In order to solve the problem of sand gushing and collapse in shaft construction of confined water silty sand stratum,deep hole grouting curtain was used instead of artificial precipitation.Through the design of the grouting curtain and the addition of the cover measures to prevent the side wall of the shaft from sliding,the influence of groundwater in the shaft excavation process was effectively blocked,and the conditions of waterless operation in underground excavation was satisfied.