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| Знайдено в інших БД: | Реферативна база даних (2) |
Список видань за алфавітом назв: Авторський покажчик Покажчик назв публікацій  |
Пошуковий запит: (<.>A=Fedko M$<.>) | |||
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Загальна кількість знайдених документів : 3 Представлено документи з 1 до 3 |
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| 1. | 
Stupnik M. Improvement of the method of drilling and blasting operations at the use of explosive substance "Ukrainite" in underground mining works [Електронний ресурс] / M. Stupnik, V. Kalinichenko, B. Rymarchuk, S. Pysmennyi, M. Fedko, E. Kalinichenko // Технологический аудит и резервы производства. - 2018. - № 6(1). - С. 29-35. - Режим доступу: http://nbuv.gov.ua/UJRN/Tatrv_2018_6(1)__8 | ||
| 2. | 
Stupnik M. I. Investigation into crown stability at underground leaching of uranium ores [Електронний ресурс] / M. I. Stupnik, V. O. Kalinichenko, M. B. Fedko, О. V. Kalinichenko // Науковий вісник Національного гірничого університету. - 2018. - № 6. - С. 20-25. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_6_5 Purpose. Determination of influence of various factors on crown stability at underground block leaching of uranium ores. Methodology. Mathematical modeling applying the finite element and analytical methods is used to investigate into the impact of the ore body dip angle and crown workings on changes in the crown stress-strain state and stability. On this basis, dependencies of the above factors' influence on the crown stability are determined enabling their adequate consideration when specifying the appropriate crown thickness. Laboratory studies allow estimating influence of the reagent used at block leaching of uranium ores on their hardness for the purposes of determining safe crown parameters. Findings. The dependencies of the ore body dip angle impact and the degree of crown disturbances caused by workings on crown stability as well as uranium ore hardness decrease resulted from application of the acid solution enable adjusting the appropriate crown thickness in determining safe parameters of the technology at the stage of the design work execution. Originality. Scientific novelty consists in determining dependencies that consider the impact of the ore body dip angle and the degree of crown disturbances caused by workings on crown stability. For the first time, influence of the sulfuric acid solution used in underground block leaching of uranium ores on changes in their hardness has been studied. Comprehensive consideration of the effect of these factors and the determined dependencies enables specifying safe thickness of crowns and ensures their integrity. Practical value. Possibility of adjusting crown thickness considering the ore body dip angle, the degree of disturbance caused by workings, and the acid solution impact will allow specifying the appropriate crown thickness at the stage of designing. This will allow avoiding possible failure of crowns caused by negative impacts of the above factors and ensuring safety of works. | ||
| 3. |
Fedko M. B. Determination of drilling and blasting parameters considering the stress-strain state of rock ores [Електронний ресурс] / M. B. Fedko, I. O. Muzyka, S. V. Pysmennyi, O. V. Kalinichenko // Науковий вісник Національного гірничого університету. - 2019. - № 1. - С. 37-41. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2019_1_7 Purpose. Enhancing methods for determining parameters of drilling and blasting operations considering the stress-strain state of rocks. Methodology. Dependency of the inclined exposure dip on the stress-strain state of rocks to be caved is determined by the analytical research technique and mathematical modeling applying the finite element method. Findings. The work offers methods for determining the energy intensity factor for breaking ores onto the inclined exposure which considers the exposure dip while correcting drilling and blasting parameters. There are also offered calculated numerical limits for the above factor. Originality. The scientific novelty consists in determining numerical values of the energy intensity factor for breaking the rock massif considering its stress-strain state when caving onto an inclined exposure (compensation area) taking into account its dip. The work suggests limiting the range of obtained numerical values of the factor when breaking the massif onto any type of exposures. Practical value. Drilling and blasting parameters can be corrected depending on changes of the ore massif stress-strain state when caving it onto any type of exposures (horizontal, vertical or inclined). The dedicated computer program created enables immediate acquisition of basic drilling and blasting parameters for particular conditions and analysis of predicted values of fragmentation of the massif to be caved. | ||
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