Abstract: Many coal mines in China are located in the toe of high and steep slopes or old landslide. Engineering activities lead to the geological disasters of slope failure or the old landslide resurrection occasionally. As far as large old landslides are concerned, normally it has a long cycle time for resurrected deformation, with slip direction varying from the conditions of stress field, and multistage destruction bring non-continuous, which also bring many problems in stability evaluation and scientific prevention of the slope. Zhujiadian mine landslide was taken as an example in this paper to figure out the engineering geological conditions in the landslide area, revival factors of landslide, deformation failure characteristics, and the temporal and spatial relationship between the engineering activities and landslide revivification through field survey and long-term monitoring. Furthermore, FLAC3D numerical simulation has been conducted for analyzing the slope stability and deformation under different stress conditions, such as caves construction, before and after the gangue filling and slope toe cutting. Under these circumstances, the change law of landslide of particle displacement, plasticity status and the shear strain increment and the characteristics of stress and displacement in the coal roadway located in the toe of landslide have been recreated. The result is consistent with monitoring results in the field.

Key words: landslide in coal mine, gob, formation mechanism, numerical analysis, stability