| In view of the shortcomings of the original upward slicing dry filling mining method in a hard rock underground uranium mine, such as complex production process and poor safety, the open stope subsequent filling mining method with good safety and simple process was introduced, and the stope structure parameters were compared and optimized. First, the size combination of the primary stope is obtained according to the actual situation of the mine. Then, based on Mathews stability map and rock classification index of the mine, the stope structure parameters with good stability are obtained. Then FLAC3D software(Fast Lagrangian Analysis of Continua) is used to simulate and verifie the mechanical response of stope when using open stope subsequent filling mining method and upward slicing dry filling mining method. Finally, the optimal scheme is selected based on the comprehensive analysis of mining method characteristics. The simulation analysis results show that: in the case of open stope and subsequent filling mining method, the range of plastic zone, stress and displacement of 50 m * 3 m stope after mining are the best, and the combination has strong production capacity, simple construction, and relatively safe personnel and equipment, indicating that the mining with this structural parameter has better protection, and is the preferred stope size scheme. |