Abstract:

In order to solve the problem of water gushing on the excavated surface and excessive surface subsidence during the excavation of earth pressure balance shield tunnel in deep buried and waterrich weathered fissured rock stratum, the filling and grouting technology based on the Shadi shield tunnel on GuangzhouFoshan ring railway is introduced. The numerical simulation analysis to the filling and grouting technology is carried out by using the finite difference software FLAC3D. The results show that: when the EPB shield passes through beep buried and waterrich weathered fissured rock stratum, the rock deformation around the tunnel is small, the ground subsidence and building deformation are sensitive to groundwater loss. With the combination of air pressure balance and grouting treatment in cabin filling, supplemented by microdisturbance and other construction control methods, the complete set of filling and grouting technology can effectively solve the problems of jet phenomenon during construction and excessive settlement of surface building (construction). When the technology of filling and grouting is adopted, the grouting range on the excavation surface and the technical parameters of grouting should be reasonable, and the effect of grouting thickness on construction progress should be considered.

Key words: earth pressure balance shield tunnel (EPB), large depth, waterrich weathered rock, soil chamber grouting technology, groundwater seepage