Abstract: To study the disturbance influence of drainage in the tunnel on seepage field of surrounding rock, first, the distribution laws of seepage field of tunnel surrounding rock under drainage are discussed using numerical simulation method, and the concept of disturbance height of seepage field of surrounding rock is proposed. Second, the influence of different factors on the disturbance height of the seepage field， i. e. water head, permeability coefficient, and drainage rate, is analyzed using the control variable method. Third, the sectioned calculation method for seepage disturbance height is obtained using the mathematical fitting method. Finally, the proposed calculation method is verified by a laboratory similarity experiment. The main conclusions are drawn as follows: (1) after drainage in the tunnel, the seepage field of surrounding rock is disturbed, and the disturbance range of the seepage field exists within a certain height above the tunnel crown, called the disturbance height of the seepage field of the surrounding rock; (2) the permeability coefficient, water head, and drainage rate are all positively correlated with the disturbance height, and the influence degree of the permeability coefficient is the highest, followed by that of water head, and that of drainage ratio is the lowest; (3) under a certain permeability coefficient and drainage rate, the disturbance height of the surrounding rock seepage field shows an obvious twostage characteristic with increasing water head. When the water head is lower than the critical water head, the disturbance height linearly increases with the increasing water head height, however, the disturbance height is constant when water head is higher than critical water head; and (4) the calculation formula for disturbance height is proposed and verified by an indoor experiment, and the results show the validity and rationality of the formula.

Key words:  , deepburied waterrich tunnel, disturbance height of surrounding rock seepage field, calculation method, numerical simulation, model test