采空区处理对上部采场边坡稳定性影响的研究

Research on the Influence of Golf Treatment to Slope Stability of the Upper Stope

目前边坡稳定性研究较多,也取得了很多成果,但针对地下开采转露天开采的边坡稳定性影响、边坡安全控制关键因素研究甚少。针对采场底部空区采用废石充填、上部空区采用崩落隔离矿柱的空区处理工艺,分析采空区进行崩落隔离矿柱对边坡坡脚应力释放、采场边坡脚距空区水平距离影响。根据边坡应力、应变和塑性区发展趋势得出:随着采场边坡脚距空区水平距离的加大,空区底部剪应力呈线性减小趋势;采空区处理时坡脚距采空区水平距离为影响上部采场边坡稳定性的关键因素。结果为地下转露天开采的边坡加固提供了依据。

At present, the research results of slope stability is fruitful, but the research results a- bout the slope stability and the key factors of slope safety control of the mine which is changing from un- derground mining to open-pit mining are relatively few. According to the goaf treatment processes that the stope bottom goof is filled by waste rocks and the upper goaf is processed with caving isolated pillars, the influences of isolation pillars caving to slope foot stress release and the horizontal distance of the stope slope foot to goaf are analyzed. According to the development tendency of slope stress, strain and the plastic zone development, it show that, with the increase of the horizontal distance of the stope slope foot to goal, the shear stress of the goal bottom has the linear decrease trend;the horizontal distance of the stope slope foot to goaf is the key factor that influence the upper stope slope stability. The above results in this paper can provide some reference for slope strengthening during the process of changing from under- ground mining to open-pit mining.