Study Of Inject Reinforce Of Tunnel Construction By Mining Method Technology

Study on the subway interval between Zhangying to Xiwang of Shijiazhuang as engineering background.Mining method construction area primarily through the formation of loess-like silt or sandy soil, Along the subway the problem of busy traffic route, adjacent buildings, tunnels, the safety and seepage problems of old water pipeline in underground construction is highlighted. Currently, the general method of dealing wtih sand and silt layer is grouting before excavating, so a depth study of permeation grouting has been done, obtaining the parameter of grouting in actual project to determine the reasonable range of reinforcement and reinforcement methods to ensure the safety of construction and operation.For the actual project, to collect and collate information of Metro and related exploration, the performance of formation statistics and analysis note, get fit grouting material for Shijiazhuang layer. Applications PFC3 D discrete element software to build a theoretical model in line with the characteristics of Shijiazhuang. Simulating grouting, in the calculation process, the main consideration include: particle ratio, permeability and pressure of grouting and grout diffusion radius to obtain the relationship between these effects.Distribution and thickness of the tunnel arch is the scope of the mainland layer,using the method of numerical analysis for different grouting materials, grouting and reinforcement parameter range, when the tunnel was in shallow deep of layer simulate a deformation value using step method finally obtain stable ground should be reinforced tunnel interval.