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Загальна кількість знайдених документів : 4 Представлено документи з 1 до 4 |
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| 1. | 
Sudakov А. К. Concept of numerical experiment of isolation of absorptive horizons by thermoplastic materials [Електронний ресурс] / А. К. Sudakov, О. Ye. Khomenko, M. L. Isakova, D. A. Sudakova // Науковий вісник Національного гірничого університету. - 2016. - № 5. - С. 12-16. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2016_5_4 Purpose. Development the theoretical foundations of isolation of absorptive horizons using melts of fusible thermoplastic materials for the construction of algorithms and the creation of a complex of programs that allow calculating heat and mass transfer processes with the use of computers in a wide range of conditions. Methodology. The problem is solved by a comprehensive study including analysis and synthesis of the literature and scientific and technological achievements in various fields of economic activity, mathematical, physical modeling, numerical methods of solution. Findings. A general concept of computing experiment in theoretical modeling of processes of heat and mass transfer in elimination of absorption of washing liquid in the well is developed. The theoretical foundations of the isolation of absorptive horizons using melts with the construction of an algorithm for creating a complex process of calculating the heat and mass transfer program with the use of computers in a wide range of conditions. Originality. The theoretical basis of the isolation of absorptive horizons using bulk melting of fusible thermoplastic materials was further developed. For the first time, an algorithm of creating complex programs that allow for calculation of heat and mass transfer processes in elimination of washing liquid absorption by the bulk melting of granular fusible thermoplastic material is offered. Practical value. The practical significance lies in developing the method of isolating absorptive and unstable horizons for the implementation of which it is necessary to perform the following operations: delivery of granular thermoplastic material on the bottom of the well, local heating of the washing liquid, melting and squeezing thermoplastic material melt in the absorption channels. | ||
| 2. |
Khomenko O. Ye. Principles of rock pressure energy usage during underground mining of deposits [Електронний ресурс] / O. Ye. Khomenko, А. К. Sudakov, Z. R. Malanchuk, Ye. Z. Malanchuk // Науковий вісник Національного гірничого університету. - 2017. - № 2. - С. 34-43. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2017_2_7 Purpose. To substantiate principles of rock pressure usage during underground mining of deposits. Methodology. Zonal structuring indices of massif around mine workings were established with help of industrial, laboratory and theoretical research of stress-strain state of rock massif. Research on entropy influence on energy exchange and deformations developments in undisturbed rock massif is conducted by means of the entropy method. Research on preventive capsule formation processes around mine workings and forms of energy transition into work of rock deformation is executed with help of the energy method. Development of geo-energy approaches for the choice of development workings pathways and calculation of their bolting parameters as well as substantiation of parameters of conducting stoping operations in energy zones of preventive capsules is executed according to the estimation of geo-energy technology effectiveness and realization of industrial implementation during underground mining of deposits. Findings. Physical essence of zonal capsulation phenomenon of mine workings is revealed. Geo-energy principles of rock pressure energy usage are substantaited. Resource-saving technologies of mining of mineral depositis are created and implemented into production. Originality. The paper deals with systematization of the picture of phenomena, capsulation processes and regularities by massif of mine workings with determination of shape, sizes, quantity of energy zones, sinusoidal-damping stresses and ring modules of deformation by means of complex account of geo-energy factors that allow using energy of rock pressure in underground mining technologies systematically. Practical value. The energy prediction theory of zonal capsulation parameters research of mine workings is developed which allows studying shapes, sizes, quantity and conditions of formation of energy zones and borders of possible destruction of the massif. Power dependences are established as to changing the sizes of adjacent power zones whose ratio is a constant from the sizes and shape, depth of laying and physical properties of massif containing mine working. The thermodynamic theory of massif that is not disturbed by workings is improved by means of considering the processes of geo-energy streams redistribution and entropy exchanging with allocation into undisturbed massif in a separate entropy method of research. Further development of the sinusoidal-fading dependence of auto-wave fluctuations of stresses in massif that broken by mine workings from gradients of density, temperature, gas-and water saturations of rocks is given. | ||
| 3. |
Sudakov А. К. Analytical study of heat transfer in absorptive horizons of borehole at forming cryogenic protecting of the plugging material [Електронний ресурс] / А. К. Sudakov, A. Yu. Dreus, О. Ye. Khomenko, D. A. Sudakova // Науковий вісник Національного гірничого університету. - 2017. - № 3. - С. 38-42. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2017_3_8 Purpose. Development of the method for calculating parameters of rock freezing process in cryogenic screen formation using a new innovative technology of elimination of the drilling liquid absorption in the well. Methodology. The tasks set were solved using analytical, experimental methods of thermal physics and heat and mass transfer. Theoretical analysis is based on an analytical solution of heat transfer problem in frozen semi-infinite cylindrical layer. Findings. The paper considers physical and mathematical statement of the problem. A mathematical model of heat transfer processes in rock massive under refrigerant impact was proposed. Temperature field dynamics in rocks is presented and relation of freezing time to frozen layer efficiency is studied. Analytical expressions for calculating the parameters of protective inverted cryogen screen formation in the absorptive horizon of a borehole are obtained. Originality. For the first time, the relation of the efficiency of the inverted cryogen screen (a frozen layer around rocks around a borehole) to the heat treatment time of the absorptive horizon of a borehole and refrigerant temperature was defined. Practical value. Innovative cryogenic technology of elimination of washing liquid absorption was developed. An analytical solution of heat transfer in rock at inverted cryogen screen formation around a borehole is obtained. Regularity of rock freezing time relation to inverted cryogenic screen width is established. | ||
| 4. |
Khomenko O. Ye. Increasing ecological safety during underground mining of iron-ore deposits [Електронний ресурс] / O. Ye. Khomenko, M. M. Kononenko, I. G. Myronova, А. К. Sudakov // Науковий вісник Національного гірничого університету. - 2018. - № 2. - С. 29–38. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_2_6 Purpose - to create the technology increasing the level of ecological safety of underground mining of iron ores by means of decreasing the number of harmful substances released into the atmosphere. Laboratory and industrial research studies of the condition of the atmospheric air around mine arrangement were conducted by means of a physical-and-chemical method and biological testing. The standard method for calculation of their concentration in the atmosphere was used for determination of features of harmful substance dispersion. Regularities of ground concentration of total influence of harmful substances changing with taking into account a specific consumption of explosives and distance from an emission source are revealed. The dependence of conditional indicator of damageability of bioindicators changing with increase in distance from a source of emission and specific consumption of explosives is established. The method for calculation of ecological assessment of atmospheric air condition around an emission source is developed. Dependence of influence of ground concentration of harmful substances on damageability of bioindicators at the cellular and organismal levels is established, which allows estimating an ecological state of atmospheric air on industrial territories. Regularities of inluence of ground concentration of total impact of harmful substances on a condition of indicator systems are determined that allows estimating the state of the environment and increasing reliability of local environmental monitoring around an iron-ore mine. The technology of drilling-and-blasting operations conducting in which emulsion explosives are used during mining of iron ores by means of the chamber mining methods, which allows decreasing the hazard index of harmful substances influence on the atmosphere, is developed and implemented. | ||
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