关键词: 高陡斜坡, 重复采动, 数值模拟, 破坏机理

Abstract: The repeated mining of coal seam controls the deformation and failure characteristics of highand steep slopes and directly affects the overall stability of high and steep slopes. In order to deeply studythe influence of high and steep slope on slope defomation under repeated mining action of coal seam,taking Panzhihua Coal Mine in Shuicheng County, Guizhou Province as the engineering background.based on site investigation, combined with UAV photos and engineering geological means, FLAC softwarewas used to study the deformation process of high and steep slope induced by repeated mining of coalseam. The results show that the local collapse of the slope occurs due to the influence of topography andrepeated mining of coal seam, and the deformation failure mode is as follows : slope subsidence-pull frac.ture stage -> slope fracture through-collapse stage. Under the infuence of slope in the coal seam repeat.ed mining and mined-out area at the top of the rock mass downward bending deformation, graduallyformed fracture belt , eventually cave, at the top of the mined-out area as cave rock mass unloading, ver.tical stress decreases, the roof on both ends of caved in unloading arch, and to spread out on both ends.and appear stress concentration phenomenon. With the increase of mining layers, the overall stable stateof high and steep slope develops from stable to less stable state. It can be seen that the repeated mining ofcoal seam has great influence on the stability of high and steep slope.

Key words: high steep slope, repeated mining, numerical simulation , failure mechanism