Abstract: To research the failure mechanism of the south slope of Fushun West open-pit mine and restrain the deformation and damage,the slipping profile of the South slope was studied by using micro-seismic monitoring technology and satellite monitoring technology. The failure mechanism of slope at the final state of mining was studied and the two-stage internal dumping control measure was put forward and analyzed based on the principle of RFPA strength reduction method. The results show:1) The failure mechanism of South slope is that the damage occurred first in the upper part of the slope, then moved along the weak layer to the middle of the slope, and then was restrained by the surface of unconformity in the lower part of the slope, and finally cut out the bottom of the pit along the middle of the weak layer. 2) The two-stage internal dumping foot-pressing scheme control measure can significantly restrain the movement of weak layer. When the dumping stacked to -262 m level, the movement of weak layer was partially restrained,and the phenomenon of bottom bulging was disappeared; when the dumping stacked to -212 m level, the movement of weak layer was completely restrained, at that moment the slope safety factor was 1.324, which meets the safety requirements.

Key words: slide profile, failure mechanism, internal dumping, strength reduction, slop