GEOMECHANICAL ADAPTATION AND THEORETICAL JUSTIFICATION OF SYLVINITE ORE MINING SYSTEM PARAMETERS WITH INCREASING MINING DEPTH IN POTASH DEPOSITS
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Abstract
This article investigates the geomechanical adaptation and theoretical justification of room-and-pillar mining system parameters for sylvinite ores under conditions of increasing mining depth, using the Tyubegatan potash deposit as a case study. The physical and mechanical properties of the productive seams and surrounding rocks, natural and mining-induced stresses, tectonic factors, seam depth and thickness, and the interaction between closely spaced mined seams are evaluated. The “PRESS 3D URAL” software package was used to analyze stress concentration under different mining development schemes. The parameters of inter-chamber pillars required to maintain stability at mining depths ranging from 500 to 1000 m were geomechanically substantiated. The results obtained using the existing methodology of the Galurgiya Institute were compared with those derived from the proposed calculation method, and the minimum permissible widths of inter-chamber pillars were determined. The proposed approach was found to reduce ore losses in inter-chamber pillars by 15–20% while maintaining a design service life of 50 years. The obtained results provide a scientific and practical basis for optimizing the parameters of safe and efficient potash ore extraction at greater mining depths.
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