Abstract:Slopes of toppling-displacement generally have the structures of reversed dip;and the deformation process and deformation mechanism are considerably complicated. The deformation range of rock mass involved is comparatively large,which will produce serious harm. Through tracing analysis of monitoring data for the rock mass displacements,numerical simulation tests for typical high slope of toppling-displacement are performed in Fushun West Opencast Coal Mine. The deformation mechanism of toppling-sliding mass and its effect on deformation of ground are analyzed and investigated under the effects of mining activities. Analytical results indicate that mining under the particular geological structure and mining engineering condition causes the problems of toppling deformation. Reversed section of slope deformation plays a key role in the deformation for the whole slope;and the surface foundation deformation is mainly caused by toppling-sliding mass,which is located in the south of faults;and renovation plan for practical problem is proposed.