3D large-scale numerical model of open-pit lake slope stability—case study of Lake Most

Almost all post-exploitation open pit mines in the world are shaped as a final water reservoir. One of main hazards is slope stability lake banks. To develop reliability methodology for assessing long-term flooded open-pit lake, back analysis was conducted using 2D and 3D large-scale numerical models Lake Most, which one largest mining lakes Europe (Czech Republic). The model built, based on site observations, large scale LiDAR data, situ characterisation tests, statistical geotechnical DTMs defining complex geology numerous piezometric levels to build table. Local global safety factor (SF) were calculated strength reduction method. results highlighted combine geometric with geological create model, identify local potentially instable zones, highlight role weak contact layer. calculation SF has shown very good correlation between lowest ground movement observations noted by Czech authorities.