Abstract
Purpose. Justification in the mining-geological and mining-technical conditions of the Krasnolimanskaya mine of the possibility of mining safety pillars of coal at horizons located below the capital crosscuts, while maintaining the stability of the capital workings. The possibility of such mining of coal pillars provides additional reserves of scarce coal for the needs of the metallurgical industry and thermal power industry of Ukraine. Methodology. The studies were done out using the capabilities of the Ansys software product based on developed geomechanical elastic-plastic models, developed taking into account the geological and mining-technical features of the Krasnolimanskaya mine deposit, during the phased development of safety coal pillars. At each stage of development of safety pillars, the preliminary stress-strain state of the coal rock mass around the crosscuts was recorded, the boundary conditions were changed, and changes in the parameters of the stress and deformation field were assessed. Ten stages of evolutionary changes allow us to assess the level of operational reliability of the crosscut. Results. As a result of the research, patterns of changes in the stress-strain state of the carbon rock mass around the capital crosscuts were obtained. Based on the analysis, the possibility of their safe operation was proven and the conditions for testing safety coal pillars were justified. Scientific novelty. For the first time, for the mining and geological conditions of the Krasnolimanskaya mine, the patterns of evolution of the stress-strain state of the coal rock mass around capital crosscuts during the gradual development of underlying safety coal pillars have been studied. Practical significance. The geometric parameters of the location of workings within the field of the Krasnolimanskaya mine are substantiated, in which the mining of coal pillars on the underlying horizons is safe and preserves the operational capabilities of capital crosscuts.
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