Abstract: The water pressure and surge in front of the tunnel excavation is an important parameter of the tunneling project. The two-dimensional seepage field theory is unable to predict the water pressure and surge in the three-dimensional seepage field in front of the tunnel excavation. Based on the hemispherical surface seepage model, the analytical solution for the three-dimensional seepage field of the strata in front of the excavation was derived under different grouting patterns. The equivalent sphere area method and the equivalent sphere volume method were proposed for non-spherical pre-grouting tunnels. Afterwards, the sensitivity analysis was carried out on the pre-grouting parameters of the water surge at the tunnel excavation face. The reasonable parameters for pre-grouting tunnels of the excavation face were determined. Finally, the methods to reduce the water inflow of the tunnel were discussed. The results show that the three-dimensional tunnel seepage calculation model reflect the influx of water in front of the tunnel excavation well. The error between the equivalent spherical area method and the numerical solution is the smallest, and the equivalent spherical volume method is the second. With the increase of damage relative permeability coefficient, the water inflow at the excavation face of tunnel decreases gradually. With the increase of damage thickness, the water inflow at the excavation face become more sensitive to the change of damage relative permeability coefficient. The safe and reasonable pre-grouting parameters are that pre-grouting relative permeability coefficient k_m/k_g is 100 and pre-grouting relative thickness d_g/r₂ is 1.0. The results of this research can provide some theoretical guidance for the design of pre-grouting tunnels.