Аннотация
As underground mining operations advance to greater depths, increasingly complex geomechanical conditions require reliable assessment of the stress–strain state of the surrounding rock mass to ensure excavation stability and safety. The objective of this study is to investigate the influence of in-situ stress conditions on stress redistribution, yielded zone development, and rockburst susceptibility around deep underground excavations. Numerical modeling was performed using the finite element method implemented in Rocscience RS2 for mining depths ranging from 600 to 1500 m and different lateral stress coefficients. The Hoek–Brown failure criterion was adopted to evaluate rock mass stability and identify yielded zones, while rockburst susceptibility was assessed using the Turchaninov, Wang, and Castro criteria. The results demonstrate that increasing mining depth significantly increases stress concentration around excavations and promotes the expansion of yielded zones. The spatial distribution of deformation and yielded zones is strongly controlled by stress anisotropy, represented by the ratio between horizontal and vertical stresses. Higher lateral stress coefficients redistribute deformation from the roof and floor toward the sidewalls, altering the dominant failure mechanisms. All applied criteria indicate a systematic increase in rockburst susceptibility with depth, although the predicted hazard levels differ among the methods. The novelty of this study lies in the integrated assessment of stress concentration, deformation localization, yielded zone evolution, and rockburst susceptibility within a unified numerical framework. The findings contribute to improved stability assessment, support design, and geotechnical risk management in deep underground mining.