Through analyzing the landslide pattern of the slope in West Open Pit Coal Mine of Pingzhuang

a conclusion can be drawn that the weak interfaces is the main controlling factor of landslide. Considering the depth of anti-sliding pile is limited so that it can not control the potential deep-stated weak interfaces which will accumulate the potential sliding mass with the increase of mining depth

so another reinforcement method

using prestressed anchor rope to reinforce the deep-stated weak interfaces

is analyzed. The results show that this method can improve the strength of the whole rock mass obviously and erase the incipient fault of slipping along the weak interfaces. The practice of the mining area also proves that the prestressed anchor rope reinforcement is in good working order and meets the expectant result.