Research on Key Construction Technology of Shield Tunnel Grouting in a Beijing Subway Project

The shield construction is used from Xitieying staiton to You'anmen outside station in a Beijing subway project. When the tube sheets break away from the the shield tail, an annular gap will be formed between the soil and the tube sheets. The paste can reduce the ground subsidence and even collapse when it is synchronously grouted to the annular gap. After filling, the soil pressure on the tube sheet can improve the early stability and the sealing property of the tube sheet lining. The hardening filling layer can also serve as waterproof; it has waterproof effect, but also can improve the strength and durability of the tunnel lining structure. Due to the flexible construction method, short construction period, low cost and so on, the synchronous grouting method has become a common method in shield construction.