DOI: 10.18503/1995-2732-2025-23-4-14-22
Abstract
When developing steeply dipping deposits of valuable ores using the open-pit and underground methods, a barrier pillar is formed in the sides and the bottom part at the boundary and is usually extracted last. If its reserves are mined by underground mining methods, the geomechanical situation changes significantly, which complicates the assessment of the undermined ledges stability. The main problem in the geotechnical assessment of the stability of undermined slopes is the choice of the most likely sliding surface, which will be determined by the combined effect of open-pit and underground mining, the morphology and size of the barrier pillar, the extraction technology, and the state of the open-pit and underground mined-out spaces. The purpose of these studies is to develop a method for calculating the stability of undermined quarry slopes during the extraction of barrier pillars. Two typical scenarios of underground mining of barrier pillars in quarry slopes were studied. As a result of these studies, the main methodological principles for assessing the stability of undermined quarry slopes were formulated. The analysis of the conducted geomechanical calculations showed that the potential sliding surface for the undermined slope had a complex configuration, which was individual in each case and included the intersection of possible sliding surfaces of the ledges, the slope itself, and the zones of displacement formed by underground work. The application of the obtained methodological guidelines will allow for a practical assessment of the stability of the slopes for deposits developed by the open-pit and underground methods.
Keywords
undermined slopes, barrier pillars, sliding surface, methodology for assessing the stability of the sides slopes
For citation
Kalmykov V.N., Mazhitov A.M., Kravchuk T.S., Zoteev O.V. Geomechanical Assessment of the Stability of Quarry Sides During Underground Mining of Barrier Pillars. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2025, vol. 23, no. 4, pp. 14-22. https://doi.org/10.18503/1995-2732-2025-23-4-14-22
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