Influence of Thickness of Pillar between Haulage Level and Undercut on Stability of Development Drifts
T. F. Kharisov, O. D. Kharisova
Institute of Mining, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Keywords: Level caving, development drifts, stresses, strains, undercut level, stability, stress concentration zone, great depths
Abstract
The increase of an undercut height relative to haulage drifts is one of the effective measures aimed to enhance operating safety of the latter. The FEM-based stress-strain change modeling is performed in rock mass during ore block mining in complex geological conditions at different vertical distances between development drifts and stopes. The research reveals an inversely proportional dependence between the undercutting level height relative the haulage level and the total length of operating excavations in the influence zone of stoping. The determined dependence makes it possible to select an optimal height of the undercut level for the benefit of stress control in rock mass and towards minimization of the adverse influence of stresses on mine infrastructure.
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