Impact of longwall mining on slope stability – A case study

Abstract In recent decades, many open pit (OP) mines have either already made the decision or are at planning stage to change their mining activity from OP underground (UG) remain competitive. Technically, before ends its operation, both and UG will be operated simultaneously for a certain period of time. It is well known that operation causes subsidence, discontinuous deformations, changes in hydrogeological conditions. case located below mine, slope deformation can expected as result subsidence induced by exploitation. This paper presents numerical analysis stability under influence longwall Cao Son mine Vietnam. All calculation variants were performed using Finite Difference Method code, FLAC. order evaluate slope, various geometry configurations showing advances extractions examined. Based on outcomes, assessments presented, then, practical actions regarding location direction extraction recommended, with an aim minimize impact slope.