№82-8
Research methodology for the stress-strain state of rock mass using analytical methods during the transition from open-pit mining technologies to open-pit and underground mining technologies for iron ore
О. Shepel1 https://orcid.org/0000-0003-4581-5441
1Kryvyi Rih National University, Kryvyi Rih, Ukraine
Coll.res.pap.nat.min.univ. 2025, 82:95-106
Full text (PDF)
https://doi.org/10.33271/crpnmu/82.095
ABSTRACT
Purpose. Geomechanical analysis of rock mass conditions to justify the stability of open-pit slopes and underground workings during the transition from open-pit to combined mining.
The methods. A comprehensive approach was applied, which included: analytical summarization and systematization of existing scientific works on geomechanics, mining engineering, and mathematical modeling; analysis of the physical and mechanical properties of heterogeneous rock masses; the finite element method for model creation; and regression analysis.
Findings. A study established that the chosen methodology for analyzing the stress-strain state during combined mining effectively models and visualizes tasks for engineering decision-making. It was proven that it is appropriate to analyze the stress-strain state of rock masses using classical mathematical modeling methods, specifically the finite element method. Presenting the results as contour lines is a clear way to quickly identify the boundaries of stress zones, locate the most stressed and unstressed areas of the rock mass, and evaluate the mutual influence of open-pit and underground workings. This is key for assessing stability and making design-related engineering decisions.
The originality. Quantitatively, the studies conducted justified the relationship between the magnitude of maximum stresses in the rock mass beneath the open-pit floor and the depth of the future underground stopes. For the first time under these conditions, an exponential relationship with a high coefficient of determination was established. A pattern was identified where the dense arrangement of principal compressive stress isolines around the stope contour, particularly at the corners and in the center of the roof, is a result of the formation of “stress arches”.
Practical implementation. The research findings allow for the scientific substantiation of mining operation parameters and sequencing during the transition from open-pit to underground mining. This minimizes collapse risks, ensures the stability of pit walls, and enhances work safety in the transition zone.
Keywords: open-pit, combined, underground, integrated mining, ore, magnetite quartzites, stress-strain state.
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