Probabilistic assessment of slope stability at ore mining with steep layers in deep open pits

Purpose. A methodology development for predicting the geomechanical situation when mining an ore deposit with steep-dipping layers, taking into account uncertainty in determining rock properties, which is a consequence of mass heterogeneity. Methods. The assessment open-pit wall stability based on combination numerical simulation stress-strain state (SSS) and probabilistic analysis. finite element method used to determine changes SSS that occur at various stages operations due design overall slope angle. elastic-plastic model medium Mohr-Coulomb failure criterion are implemented codes 3D analysis program RS3 (Rocscience). Stochastic assess random risks associated natural object variations. Findings. distribution maximum shear strains, localizes real or potential sliding surfaces mining, has been identified. Based Shear Strength Reduction procedure, Factor (SRF) determined. probabilities loss, as well decrease strength reduction factor below standard level all body have revealed. Originality. For first time, mining-geological conditions deep open pit, dependence angle, during each steep layer, stage operations, probability determined stochastic simulation. Practical implications. ratio between contour characteristic (overall angle) safety basis practical solutions ensure efficiency friable hard overburden excavation, extraction, subsequent optimization contours.