Firstly

based on considering the theoretical solution of liner and grouting circle

the calculation and automatic drawing program has been developed with MATLAB software; and the relationships among water inflow

external water pressure and water head

tunnel radius

rock permeability

lining permeability are researched. Secondly

through the comparison of the numerical result and theoretical solution based on the FLAC3D

the correctness of application of numerical simulation methods to the tunnel seepage field are verified. On this basis

combined with the typical range of Qingdao metro

the seepage fields in the excavation stage and operation period are studied; and the relationships between water inflow and external water pressure of grouting circle are researched under different grouting circle thickness and grouting parameters. The results show that the application of grouting circle to the tunnel to reduce the water inflow is feasible; and the greater the grouting circle thickness and the smaller the grouting circle permeability

the less the tunnel water inflow; but the changing law of the external water pressure is on the contrary. The obtained results play an important role in designing the liner and the preliminary definition of the grouting thickness.