Steep mining method in slippery area of end-slope under slope timeliness

In order to solve the problem that a lot of coal is covered in slippery area of end-slope for steep mining is difficult to be implemented, based on the theory of slope timeliness and the steep mining technology, two strip steep mining methods as vertical and parallel propelling were proposed and the analysis system for confirming the best cut width was established. According to the systematical sequence, numerical simulation was conducted with strip steep mining method in slippery area of end-slope in Sandaoling open coal mine, which drew a conclusion that the best cut width of the slope is 60 meters, and the scheme of advancing vertical end-slope trend is recommended in the paper. The results reveal that the angle of eastern end-slope can be increased from 34° to 41°, which will recover 193, 100 tons of coal residues in end-slope. It could ensure slope stability, recycle residual coal and reduce the stripping ratio by applying strip steep mining method in slippery slope.