Abstract:Purpose: To analyze the evolution law of precursor information of water and mud breakout on faults by taking the construction of drainage roadway through the fracture zone of Julong copper mine in Tibet as the engineering background. Method: Through numerical simulation, we investigated the changing rules of displacement, stress, plastic zone, and seepage field of surrounding rock during the construction of drainage roadway to the crushed zone under the effect of fluid-solid coupling, and analyzed the evolution law of premonitory information of water and mud breakout in the roadway through the crushed zone of the fault. Result: The results show that when the roadway is excavated to the fracture zone, the displacement of the palm face increases abruptly. At the same time, stress disturbance occurs in the fracture zone. The plastic zone of the surrounding rock expands in the direction of the crushing zone, and the rock body in the crushing zone undergoes plastic deformation, which is connected with the plastic zone of the palm face. When the roadway is excavated to the crushing zone, the seepage field in the surrounding rock changes obviously, the exposed crushing zone forms a drainage outlet, the water pressure of the surrounding rock decreases suddenly, and the roadway is prone to sudden water and mud accidents. Significance: The results of this paper provide a theoretical reference for the construction of Julong drainage road through the crushed zone.