Abstract:The upward horizontal layered filling method is suitable for mining of various angles and various thicknesses. It has been widely used in the mining field. However, the determination of the safe span of the mine has always been a difficult problem in mining design. Combining Mathews stability diagram method and numerical calculation method, this paper first determines the maximum safety span of the mine through Mathews stability diagram method, and then carries out simulation analysis by numerical software to determine the stability of the mine, thus obtaining a reasonable span of the mine. The horizontal stratified filling method provides a basis for determining the span of the mine.