Abstract: Aiming at instability and landsliding of the southwest slope in Zhujiabaobao mine， slopes at the height of 1180 m to 1 270 m were monitored and analyzed by means of theoretical analysis and field monitoring. The study showed that the slope instability caused wedge-shaped failure， and the stabilization type of the sliding body was determined as possible sliding； The instability brings serious hidden trouble to the safety production of the stope， and all the sliding bodies above the level of 1 180 m were cleaned up by expanding the slope. At the same time， the support scheme of bolt， anchor cable and rib baffle was adopted to relieve the safety threat of the sliding body to the stope， and the 1270 m highway reopened to traffic.

Key words: Slope instability, Wedge failure, Monitoring, Stability analysis, Slope expanding and cleaning