Abstract: In order to overcome floor water inrush under mining above confined water, especially for deep mine, it's necessary to analyze the feasibility and make the safety evaluation before development and mining. According to the hydrogeological conditions analysis at deep mining area of a certain mine, it is considered that this area is available to mining. With the use of the floor seepage model and the modified hydraulic parameters, and based on FLAC^3D anisotropic permeability model, the coupled simulation of stress field-seepage field is simulated to obtain the depth of floor failure. The results show that the floor damage deepness at normal region and at structural damage region are about 25 m and 50 m respectively. According to the water bursting coefficient, the safety depth of mining and the length of working face are evaluated. At the same time, prevention and treatment measures of water disaster are also presented. Keeping the water bursting coefficient of 0.06 MPa/m, taking hydrophobic decompression measures, lowering the water head to -950 m level, it is safe to recover the 15# coal seam.

Key words: Feasibility analysis, Coupling stress field-seepage field, Numerical simulation, Floor damage deepness, Safety evaluation