Гірничо-металургійний факультет

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Angular measurement errors in underground mine surveying reference networks
(Державний університет "Житомирська політехніка", 2024) Nazarenko, V. O.; Brui, H. V.; Krivoruchko, А. O.; Levytskyi, V. H.; Назаренко, В. О.; Бруй, Г. В.; Криворучко, А. О.; Левицький, В. Г.
Surveyorʼs reference networks are the main geometric basis of all underground surveys and consist of polygonometric courses laid, as a rule, along capital and main mine workings. When laying polygons along mine workings, horizontal angles between each two adjacent sides of the course, inclination angles and lengths of the course sides are measured. Each measurement is performed with some error, which eventually leads to errors in determining the coordinates of polygon points. The peculiarities of underground polygonometric courses due to their forced configuration determined by mine workings, the presence of forced short sides and a limited number of starting points, contribute to the rapid accumulation of errors in the course as the distance from the starting points. The accuracy of measurements in the polygonometric passes, laid in the construction of underground reference networks, is characterized by the general normative indicators: the mean square error of measurement of horizontal angles of 20", vertical angles – 30". According to the requirements of the current normative instructions, the measurement of angles in underground polygonometric passages should be made with theodolites of T15 type or theodolites with the accuracy of the reference device not less than 15". The last requirement applies to theodolites of T30 type. In polygonometric moves laid along the mine workings with an angle of inclination of less than 30 °, the angles are measured in one repetition or reception. Measurement of angles in mine workings with an inclination angle of more than 30 ° is recommended to perform a method of techniques (at least two), observing the following rule: before each technique set the vertical axis of rotation of the theodolite in a plumb position and re-centering the device. If we proceed only from the instrumental component of the total error of angle measurement to ensure the mean square error of horizontal angle measurement ±20" theodolite type T15 should perform angle measurement in one full method, and theodolite T30 – in three methods. Instrumental error of angle measurement is caused by errors of sighting, counting, eccentricity of the limb and alidade, incorrect geometry of the horizontal circle, non-verticality of the theodolite rotation axis. The studies of errors in measuring horizontal angles in underground surveyorʼs polygonometric courses made it possible to draw the following conclusions: – the recommendations of the instruction «Surveying work at coal mines and surface mines» on the use of theodolites with a readout accuracy of 15" does not provide the required accuracy of horizontal angle measurements; – when using theodolites of T15 type to measure the angle with sides up to 20 m it is necessary to use only automatic centering of theodolite and signals; The scientific paper contains charts for determining the ways of centering and the number of methods of measuring horizontal angles in underground surveyorʼs polygonometric moves.
Assessment of the technical condition of water infrastructure facilities using the example of regulatory basins
(Czech University of Life Sciences Prague, 2021) Chushkina, I. V.; Maksymova, N. M.; Orlinska, O. V.; Pikarenia, D. S.; Hapich, H. V.; Roubík, H.; Максимова, Н. М.; Орлінська, О. В.; Пікареня, Д. С.
Control of the workplace environment by physical factors and smart monitoring
(Association for Computational Materials Science and Surface Engineering, 2020) Kruzhilko, O. Ye.; Polukarov, O. I.; Vambol, S.; Vambol, V.; Khan, N. A.; Maystrenko, V.  V.; Kalinchyk, V. P.; Khan, A. H.; Кружилко, О. Є.; Майстренко, В. В.
To develop and implementation in practice an algorithm for smart monitoring of workplace environmental physical factors for occupational health and safety (OSH) management.
Determination of design indicators of earth surface deformations for mineable buildings and structures
(Інститут геотехнічної механіки ім. М.С. Полякова НАН України, 2023) Nazarenko, V. O.; Brui, H. V.; Kuchin, O. S.; Назаренко, В. О.; Бруй, Г. В.; Кучин, О. С.
Coal is one of the main sources of energy in Ukraine. Underground coal mining is concentrated in the ar-eas of Eastern and Central Donbas, Western Donbas, and in the Lviv-Volyn region. Development of coal seams leads to displacement of rocks and uneven subsidence of the surface. Surface movements and deformations cause serious damage to the environment. They affect residential and industrial infrastructure, and can cause destruction or disruption of operating conditions. Risks to surface structures can be reduced by predicting subsidence and surface deformation over underground workings. In Ukraine, the method of typical subsidence and deformation distribution functions is used for forecasting. This is a simple and universal method, but it does not take into account the differences in deformations in different zones of the shear trough depending on the direction of movement of the face. For this reason, incorrect predic-tive estimates of the impact of mining operations on the earth's surface, man-made natural, industrial and civilian objects arise. This paper presents a methodology for determining the estimated deformations of the foundations of civilian build-ings that are being faked, taking into account the assessment of the estimated impact of mining operations, which takes into account the peculiarities of the formation of the shear trough in space and time. This methodology was developed to supplement and clarify the "Temporary technical conditions for the protection of structures and natural objects from the impact of underground mining operations. KD 12.00159226.013-95" for the conditions of underground mining of coal seams in the Western Donbas, as well as other deposits with similar conditions and parameters of the earth surface displacement process. It is based on modern concepts of rock and earth surface movements during underground mining of coal seams with horizontal and gentle rock occurrence; results of analysis of numerous instrumental surveying obser-vations, including frequency ones, at observation stations of mines in Western Donbas. The obtained regularities allow for a more objective selection and application of protection measures for civil buildings. This reduces the risks during the operation of buildings, makes it possible to plan repair and restoration work, and to make a rea-sonable assessment of buildings and territories in the real estate market.
Determination of the level of pollution of water resources
(European Scientific Platform & LLC International Centre Corporative Management, 2021) Chushkina, I. V.; Maksymova, N. M. ; Чушкіна, І. В.; Максимова, Н. М.
The based on the data of laboratory studies, an integrated assessment of the quality of water resources the village of Mala Belozerka. Analytical researches have search character of an integrated estimation of level of pollution of district and are executed by a method which is offered by researchers Kryzhanovsky E.M. and Davydov I.V., is of a recommended nature and based on the algorithm of the officially approved methodology of the KND 211.1.1.106 "Organization and implementation of observations of surface water pollution (in the system of the Ministry of Energy)". According to the results of the calculation of the total pollution rate, it was found that the local water resources are characterized as dirty, despite the relatively high quality of groundwater, which is used as a source for drinking water supply to the rural population.
Determination of the transfer step of the ore chute while mining the technogenic deposit of the bulk type
(EDP Sciences, 2020) Peregudov, V.; Hryhoriev, I. Ye.; Joukov, S.; Hryhoriev, Yu. I.; Григор’єв, І. Є.; Григор’єв, Ю. І.
Further development of the open mining works on the domestic enterprises will be accompanied by the worsening of mining-geological conditions and declining of the quality of iron ore raw materials. In the same time, the accumulated mining wastes, that can make the technogenic deposits, pass into one of the important sources of the mineral raw materials. Taking into account this thing, the development and implementation of the modern technological circuits of the technogenic deposit development is an actual calling for mining industry, and determination and optimization of process conditions of the technogenic deposit development – is the scientific task of this publication. The obtained results of studies of the optimum step value of the ore chute transfer during the technogenic deposit development can be used by design organizations and mining enterprises for designing works. The obtained methodology and the proposed mathematical dependencies will reduce the cost of mining of the technogenic deposit due to the reasonable timely transfer of the open ore chute.
Developing of manufacturing technology for hot rolling coils (steel grade S355MC) at the wide-strip rolling mill 1700
(SCIEMCEE Publishing London, 2018) Kurpe, O. G.; Kukhar, V. V. ; Курпе, О. Г.; Кухар, В. В.
Development of quality control and structure parameters determination methods for large size products from sintered hard alloys WC-(Co+Ni+Cr) based on analysis of the ultrasonic oscillations spreading parameters
(ПП "ТЕХНОЛОГІЧНИЙ ЦЕНТР"; Полтавський державний аграрний університет, 2021) Pashynskyi, V. V. ; Boyko, I. O.; Пашинський, В. В.; Бойко, І. О.
The object of research is hard alloys with a morphology of the carbide phase skeleton structure, in which particles contact with each other, and the gaps between them are filled with a binder phase. The mechanical and service characteristics of such materials depend on the degree of development of the skeleton structure. One of the most problematic areas is the lack of non-destructive methods for determining the parameters of the structure. The introduction of such techniques will allow obtaining objective information on the structure of the material and using it to evaluate the quality of products. In the course of the study, the parameters of the scattering of elastic vibrations in inhomogeneous media were determined. The main hypothesis of the study is the assumption that the processes of energy dissipation occur both in the structural elements themselves (carbide grains and bond areas) and at their boundaries. Therefore, the evaluation of dissipation processes will allow obtaining a quantitative estimation of the alloys structure parameters, and will allow assessing the quality of the material. The following characteristics were chosen as the parameters characterizing the propagation of ultrasonic oscillations: the speed of the oscillations propagation, the scattering background level in relation to the amplitude of the bottom reflection, the oscillations attenuation coefficient. The parameters were determined and compared with the characteristics of the quality of the products and the parameters of the microstructure, which were determined by the methods of quantitative metallography and the statistical characteristics of the relationship between the parameters, were determined. As a result, new quality control procedures for carbide products have been developed. The contiguity characteristics of the carbide skeleton of the sintered cemented carbide were determined by measuring the propagation speed of ultrasonic oscillations. The assessment of the level of porosity with a pore size of less than 1 mm was carried out according to the results of measuring the relative amplitude of the background scattering of ultrasonic oscillations. The proposed methods are non-destructive and are carried out in one cycle with ultrasonic flaw detection, to which 100% of the products are subjected. These techniques have been introduced in the production of carbide rolls by the method of controlled hot vacuum pressing. They have become an integral part of the quality control system for carbide rolls.
Development of the effective information and analytical support of the OSH management system
(Association for Computational Materials Science and Surface Engineering, 2020) Kruzhilko, O. Ye.; Maystrenko, V.  V.; Kalinchyk, V. P.; Polukarov, Yu. O.; Mitiuk, L.; Bilotserkivska, N.; Borysova, L.; Kachur, T.; Кружилко, О. Є.; Майстренко, В. В.
Studying urgent problems in the OSH management field in the in European countries to create effective information and analytical support for the OSH management system.
Directional fracturing of rock by soundless chemical demolition agents
(On Ching Lo, 2024) Sakhno, I. G.; Sakhno, S. V.; Сахно, І. Г.; Сахно, С. В.
Rock fracturing is one of the main processes in the modern mining, mineral recovery, and energy industry, which is associated with the numerous environmentally harmful influences. Environmentally friendly alternative to conventional fracturing methods is non-explosive technology, which based on using of soundless chemical demolition agents (SCDA). In this study, method of directional fracturing, which based on creating tensile stress concentrators on the hole surface in the required location, was proposed. Considering the influences of additional installation in the borehole of stress concentration cartridge on stress field nearby the hole, a case study of the effectiveness of proposed rock fracturing method was performed in this paper. A numerical simulation was used to study the stress distribution around the borehole with SCDA in different rock types. It was found that cartridge installation leads to the occurrence of the tensile stress concentrations only near to the gap of the cartridge. The value of tensile stress concentration in the proposed rock fracturing method significantly depends on a cartridge gap distance. An increase in the gap distance leads to a decrease in the stress concentration factor. For granite, sandstone and mudstone, relationships of stress concentration factor to cartridge gap distance that was divided on hole diameter were obtained. The equation for calculating of the hole spacing for the directional fracturing method was proposed. The results of the study are confirmed by experiments in-situ on the directional fracturing of rocks in a quarry and in a coal mine.
Dominant Determinants of Adaptation of the Mining Complex in the Conditions of a Dynamic Environment
(Wydawca POTOPK, 2023) Hryhoriev, Yu. I.; Lutsenko, S. A. ; Joukov, S.; Григор’єв, Ю. І.
Modern business conditions increasingly clearly demonstrate the dynamism of the surrounding world. Such changes in economic, technological, social and economic factors must be taken into account when planning and designing mining operations. In this article, it is proposed to consider the mining region as an anthropotechnical complex from the standpoint of a systemic approach. Management strategy of an open-pit group was developed and nomograms for practical use are given on its basis. Based on this decomposition approach, an adaptation mechanism is proposed. Its principle is that a set of adaptation tools is adopted for each rank of the anthropotechnical complex. The experience of using these tools in the conditions of the Kryvyi Rih mining region is given, in particular, the use of worked out space for the placement of overburden from other open-pits, the joint placement of enrichment tailings and waste rocks, etc. An approach to distinguishing stages and indicators of adaptation according to the proposed mechanism is proposed.
Ecological Condition of Land Around Regulatory Basins of Irrigation Systems in the Dnipropetrovsk region
(Національний університет "Львівська політехніка", 2019) Maksymova, N. M. ; Orlinska, O. V.; Chushkina, I. V.; Pikarenia, D. S.; Чушкіна, І. В.; Максимова, Н. М.; Орлінська, О. В.; Пікареня, Д. С.
It is shown that the NPEMFE method is possible for using to allocate water filtration zones through the ground-based dams of basins of reclamation systems. It is allow to quickly taking measures to reduce water losses and deteriorate the ecological state of the underground hydrosphere around the regulatory basins.
English for metal forming engineering and research in metallurgy and material science
(ТОВ "ТЕХНІЧНИЙ УНІВЕРСИТЕТ "МЕТІНВЕСТ ПОЛІТЕХНІКА"; Олді+, 2024) Нікітіна, І. П.; Кирпита, Т. В.; Бояркін, В. В.; Кухар, В. В.; Малій, Х. В.; Хорошайло, О. С.; Nikitina, I. P.; Kyrpyta, T. V.; Boiarkin, V.  V.; Kukhar, V. V. ; Malii, Kh. V.; Khoroshailo, O. S.
The tutorial contains educational materials intended for Master’s students majoring in metallurgy and PhD students enrolled in degree programmes related to materials science and metallurgy. It comprises texts, exercises with supporting data, and a Ukrainian-English dictionary of professional terms that help to learn basic industry-specific terminology used in mechanical engineering, material properties, metalforming processes, and rolling technologies and machines.
Evaluating the effectiveness of measures to reduce the level of occupational injuries and occupational disease in the enterprise
(КПІ ім. Ігоря Сікорського, 2019) Kruzhilko, O. Ye.; Maystrenko, V.  V.; Storozh, Ya.; Lyakh, Yu.; Кружилко, О. Є.; Майстренко, В. В.
The article proposes a methodical approach to assessing the effectiveness of measures to reduce the level of industrial injuries and occupational morbidity in the enterprise, taking into account the causal relationships betweenthe implementation of measures and the economic indicators of the enterprise.A mathematical model for the prediction of indicators of industrial injuries and occupational morbidity has been adopted.
Experience and prospects of innovative main roadways construction and maintenance technologies of new coal units of PJSC «Mine Management «Pokrovske»
(ПП "ТЕХНОЛОГІЧНИЙ ЦЕНТР"; Полтавський державний аграрний університет, 2023) Levit, V.  V.; Kamenets, V. I.; Chebotenko, D.; Левіт, В. В.; Каменець, В. І.
The object of research is the proven and promising innovative technologies for the construction and maintenance of main roadways in difficult mining and geological terms of the Private Joint Stock Company (PJSC) Pokrovske Mine Management of Metinvest-Pokrovskvugillia Group (Ukraine). The problem focused by the research is to ensure the effective innovative and modernized known technologies application of the main roadways construction and maintenance in new coal units. Namely, the roadways and chambers of the shaft yards, long horizontal and inclined main roadways to improve their operational state and technical and economic indicators of mining engineering and extracting operations. Based on the accumulated production experience, the results of the roadways state survey under construction and in operation, analysis of documentation and scientific and technical developments of world scientific institutions, recommendations for the investment projects implementation in terms of construction and mining technologies optimizing had formulated. The recommendations include the introduction of combined support systems adapted to mine management conditions, tunneling equipment of a new technical level of the world’s best producers, methods of roadways maintaining by location in offloaded areas, and modern means of Geomechanic situation monitoring. The expected economic benefit of reducing the cost of roadways maintaining may be 20–25 %. The results are summaries of cooperation with the engineering and technical staff of Mine Management Pokrovske and Metinvest Holding. The results can be used in practice now, and more broadly after the victory and the start of economic recovery, including in Ukraine’s mining sector.
Experimental Research of Spring-Back Effect during Sequential Forming with Different Inner Angle, Thickness and Bending Width of Blank
(UTP University of Science and Technology, 2019) Kukhar, V. V. ; Nahnibeda, M. M.; Radushev, O.; Markov, O.; Anishchenko, O. S. ; Prysiazhnyi, A. H. ; Кухар, В. В.
Floor Heave Control in Gob-Side Entry Retaining by Pillarless Coal Mining with Anti-Shear Pile Technology
(MDPI, 2024) Sakhno, I. G.; Sakhno, S. V.; Skrzypkowski, K.; Isaienkov, O.; Zagórski, K.; Zagórska, A.; Сахно, І. Г.; Сахно, С. В.
The severe floor heave in gob-side entry retaining is the major restriction factor of the wide application of pillarless mining thin coal seams. Reinforcement and stress-relief floor heave control methods are the most promising. However, in practice, floor restoration is widely used. Therefore, floor heave control technology in gob-side entry retaining needs to be improved. This study proposes anti-shear pile technology to control floor heave in gob-side entry retaining. The research was mainly carried out by numerical simulation. It was found that the transformation of high vertical stresses in the entry floor underneath the filling wall and coal seam body into horizontal stresses starts the floor heave process. The vertical dilatancy of rocks under the roadway span and their subsequent unloading lead to the delamination of the floor strata and uplift of the entry contour. In this paper, the best pile installation scheme was found. It is a 2pile 5+2 scheme with the installation of two piles, each 2 m long. After that, it was shown that filling piles are more than 3.3 times cheaper than comparable analogs, and pile installation is less labor-intensive. The implementation of the proposed floor heave control method leads to a reduction in heaving by 2.47 times.
Impact of ground surface subsidence caused by underground coal mining on natural gas pipeline
(Springer Nature, 2023) Bazaluk, O.; Kuchyn, O.; Saik, P.; Soltabayeva, S.; Brui. H. V.; Lozynskyi, V.; Cherniaiev, O.; Бруй, Г. В.
Underground mining of minerals is accompanied by a change in the rock mass geomechanical situation. This leads to the redistribution of stresses in it and the occurrence of unexpected displacements and deformations of the earth’s surface. A significant part of the civil and industrial infrastructure facilities are located within the mine sites, where mining and tunneling operations are constantly conducted. Irrational planning of mining operations can lead to loss of stability and destruction of undermined facilities. Therefore, it is important to study the earth’s surface deformation processes during mining operations, which ensures safe and sustainable operating conditions. The research objective of this paper is to analyse the behaviour of a natural gas pipeline under the influence of underground mining activities, with a particular focus on understanding the effects of horizontal surface deformations and their potential impact on pipeline safety and structural integrity. Its performance and safety are determined on the basis of the found parameters of the earth’s surface horizontal deformations and their comparison with permissible parameters characterizing the conditions for laying pipelines, depending on the mining-geological conditions and the degree of their undermining. Based on determined conditions for the safe undermining of the natural gas pipeline, it has been revealed that in its section between the PK212+40 and PK213+80 (140 m) pickets, the estimated parameters of the earth’s surface horizontal deformations exceed their permissible values. This can cause deformation and damage to the pipeline. For the safe operation of the pipeline during the period of its undermining, in order to eliminate the hazardous impact of mining the longwall face, additional protection measures must be applied. It is therefore recommended that the gas pipeline between the PK212 and PK214+20 pickets be opened prior to the displacement process (200 m from the stoping face), thus reducing the density of the gas pipeline-soil system. Recommendations for controlling the earth’s surface deformations within the natural gas pipeline route are also proposed, which will ensure premature detection of the negative impact of mining operations.
Improvement of operational management of hygiene and labor safety on the basis of assessment of occupational hazard
(КПІ ім. Ігоря Сікорського, 2019) Kruzhilko, O. Ye.; Tkalych, I. M.; Polukarov, O. I.; Кружилко, О. Є.; Ткалич, І. М.; Полукаров, О. І.
The purpose of the work is to provide grounds for the approach to the occupational hazard assessment. To complete the purpose, it is proposed to analyze the existing methods and approaches to the occupational hazard assessment and an approach to the occupational hazard assessment is proposed, which is based on the use of statistics on occupational injuries rates. The necessity of application of information systems for occupational hazard assessment is emphasized.
Improvement of the approach to hazard identification and industrial risk management, taking into account the requirements of current legal and regulatory acts
(Association for Computational Materials Science and Surface Engineering, 2020) Kruzhilko, O. Ye.; Maystrenko, V.  V.; Polukarov, O. I.; Kalinchyk, V. P.; Shulha, A.; Vasyliev, A.; Kondratov, D.; Кружилко, О. Є.; Майстренко, В. В.
Improving the systematic approach to planning and rationalizing labour protection measures at oil and gas enterprises, based on the results of hazard identification and industrial risk assessment. At the same time, the main task of the risk management process is to ensure the rights of employees guaranteed by the current legislation, namely, to create proper, safe and healthy working conditions.