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Based on the systematic study on the characteristics of water and mud inrush during the excavation of Jingzhai tunnel, the mechanism of water inrush seepage transformation caused by excavation disturbance is analyzed.By means of electromagnetic geophysical prospecting, the potential water bearing area of the tunnel was analyzed.The constitutive model of rock mass and grouting parameters are considered in the numerical simulation.The law of tunnel crack initiation and expansion under different curtain grouting parameters is proposed.The characteristics of seepage water inrush caused by excavation are described.