JOURNAL of Donetsk mining institute最新文献

{"title":"PROSPECTS OF USING NATURAL BLOCK STONE AS A SUPPORTING BUILDING STRUCTURE","authors":"O. Khomenchuk, Nelya Ostafiychuk, Marina Kolodii, G. Skyba","doi":"10.31474/1999-981x-2021-2-60-67","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-2-60-67","url":null,"abstract":"Purpose. Research of reinforcement methods of natural block stone and possibilities of its application as a load-bearing building structure. Methods. The study used such general logical methods as generalization, analysis and synthesis, analogy, abstraction and modelling. Results. Disadvantages of traditional technology of mining of raw materials for concrete production and the factors that increase the final cost of concrete structures are considered. Advantages and disadvantages of natural block stone in comparison with reinforced concrete building structures on the example of foundation blocks are considered. In order to reduce the cost, improve performance and give the production more flexibility, it is proposed to make such blocks of natural stone blocks with low decorative value. The analysis of known methods of reinforcement of natural stone is made, and the scheme of reinforcement of the block is developed. In order to develop effective reinforcement of such blocks, it is proposed to place the longitudinal reinforcement in the holes drilled in the block before its removal from massif, and fill them with self-expanding cement. Known methods of strengthening the inclined sections of reinforced concrete beams without transverse reinforcement are considered. To strengthen the inclined sections of the natural stone block, it is proposed to use a similar system of external reinforcement of reinforced concrete beams with carbon fiber-based tapes, which are glued with epoxy resins. Scientific novelty. For the first time in the general case, it is proposed to use natural block stone, reinforced with internal and external reinforcement, as a load-bearing structural element of the prefabricated ferro-stone foundation. Practical significance. Preliminary calculation of the minimum allowable distance from the inner wall of the holes for reinforcement rods to the outer surface of the unit without taking into account the inhomogeneities and defects that may occur in the rock, and additional loads during operation of such a unit was made. The obtained result is determined by the pressure of the cement mortar, which expands itself. If this distance is reduced, the whole wall may be destroyed. The issues that need to be solved to substantiate the proposed method of manufacturing foundation blocks, which will use all the benefits of natural stone and reduce the cost of manufacturing foundation blocks, are formulated.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116847842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"STATISTICAL MODELS OF THE CLASSIFICATION INDICATOR OF THE DEGREE OF COAL METAMORPHISM FOR THE FORECAST OF DANGEROUS PROPERTIES OF COAL BEDS","authors":"M. Antoshchenko, Y. Rudniev, M. Filatiev, E. Filatieva","doi":"10.31474/1999-981x-2021-1-49-63","DOIUrl":"https://doi.org/10.31474/1999-981x-2021-1-49-63","url":null,"abstract":"Purpose: Based on statistical models of volatile matter yield during thermal decomposition of coal without air access (Vdaf) to establish probable relative errors of its measurement of absolute values which would allow to use the indicator with predetermined accuracy Vdaf as the primary classification criterion metamorphism of coal beds for the prediction of dangerous properties when led mining. Methods. It is used to create several sets of Vdaf values that have some features that are essential for their characteristics, followed by analysis of the statistical characteristics of these sets with the establishment of differences or similarities between statistical models. Results. Six sets of coal beds, which have different features of their creation according to the Vdaf criterion. There were from 114 to 412 variants in each set. As a general conditionally accepted set of 2091 coal beds of different coal deposits. For all (7) sets tested, the hypothesis of a normal distribution of variants according to Pearson’s criterion χ2 was tested. One part of the sets tested was close to the normal distribution of random variables, and the other did not correspond to the normal law. It is established that one of the reasons for the inconsistency of parts of the population with the normal law is the various errors in determining Vdaf depending on the absolute value of this indicator. In addition, individual samples from the conditionally general population have the same nature of the distribution of relative frequencies: with an increase in Vdaf to 10%, they decrease; in the range from 10 to 40% slightly increase; when Vdaf > 40% – again there is a decrease. Based on the close correlation dependences of the relative standard deviations of the volatile matter yield from the averaging curves, the validity of the possible use of Vdaf in engineering calculations of the forecast of dangerous properties of shafts only at its values more than 15-20% is proved. The possible influence of the distance of the coal sampling site to the boundaries of gas weathering zones and geological disturbances, and the high dependence of coal (more than 20%) on the additional error of Vdaf determination was also established. The established possible error values do not guarantee high accuracy of forecasting the dangerous properties of coal beds when using Vdaf as the main indicator of the degree of metamorphism. Improving the regulatory framework for safe mining of coal seams requires justification and application of other indicators of the degree of coal metamorphism. Scientific novelty: For the first time on the basis of statistical models, ambiguous possible errors in determining the yield of volatile substances during thermal decomposition of coal without air access and the inexpediency of its use to predict the hazardous properties of coal beds in mining. Practical significance. The necessity of using other indicators of the degree of metamorphism to improve the regulatory frame","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"162 1-4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114007597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Construction of small protective fortification structures – factory-produced cylindrical reinforced concrete dugouts","authors":"Yakov Bezugliy, Y. Otrosh, R. Maiboroda, N. Rashkevich","doi":"10.31474/1999-981x-2022-2-7-13","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-2-7-13","url":null,"abstract":"Purpose. Design a dugout made in factory conditions for further implementation in the system of ensuring reliable protection of soldiers in combat conditions, taking into account quick installation and ease of use on the front line. Methods. Analysis and synthesis, generalisation, theory of probability, theory of decision-making. Results. Based on the analysis of foreign experience in the construction of fortifications, the construction of a cylindrical dugout made of reinforced concrete is presented, aimed at reducing the time of their deployment, increasing mobility and strength, ease of manufacture, and the possibility of multiple use in various places of hostilities. Scientific novelty. The structure of the dugout is a reinforced concrete pipe (barrel, container, bunker) with a diameter of 2.5÷3.0 m, a length of 4.0÷6.0 m and a wall thickness of 150÷200 mm with transverse walls at its edges that hold armoured doors . In the cavity of the pipe, a metal frame for fastening the shelves for rest is mounted, which can be turned in the pipe and fixed in the appropriate position using spacer screws. In a similar way, round armoured doors are turned and fixed in the transverse walls, around which 6÷8 holes with a diameter of 120-150 mm are provided for ventilation, lighting and observation. The further direction of the research is the formation of calculated combinations of forces for solving problems of dynamics in time, namely group D1 – calculation for emergency load, explosion, impact, failure of elements when calculating for progressive collapse with the help of LIRA-SAPR software. Practical significance. Implementation of the development results into the system of ensuring reliable protection of soldiers in combat conditions will allow to minimise losses among the military due to the use of reinforced concrete structures of cylindrical shape, manufactured in factory conditions.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117240597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SETS OF COAL SEAMS BY HYDROGEN CONTENT IN THE ORGANIC (COMBUSTIBLE) MASS AND MINERAL IMPURITIES OF FOSSIL COALS","authors":"Y. Rudniev, M. Antoshchenko, E. Filatieva, M. Filatiev","doi":"10.31474/1999-981x-2022-2-93-107","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-2-93-107","url":null,"abstract":"Purpose: to establish a set of coal seams of the same degree of metamorphic transformations of coals, differing in different elemental hydrogen content, reduced to the conditions of mining operations, taking into account the content of mineral impurities and moisture.. Methodology: based on statistical processing of experimental reference data of indicators of consumer qualities of solid fuel using information about the elemental content of the main components of the combustible mass and ash components, as well as reservoir ash content and moisture content of coal samples for their different state. Results: a different direction of change in the elemental content of hydrogen in analytical samples and recalculated for the working state of seam samples with an increase in the processes of metamorphic transformations of coals (increase in carbon content) has been established. Three sets of coal seams formations have been identified, differing from each other in the level of elemental hydrogen content in the working state of the fuel at the same degree of metamorphic transformations. Empirical dependencies are proposed for the formation of sets of coal seams by the factor of the elemental content of hydrogen on the working state of coals. To improve the regulatory framework for the safe conduct of mining operations, in terms of predicting the manifestation of hazardous properties of coal seams, it is proposed to take into account the influence of the content of mineral impurities on the total ash output from seam samples. Scientific novelty: for the first time, three samples of coal seams formations have been established, for which an increase in the elemental content of hydrogen in the working state of the fuel is observed with an increase in the degree of metamorphism (an increase in the carbon content). Practical value: the obtained scientific results allow them to be used to improve the regulatory framework for the safe conduct of mining operations in predicting the manifestation of hazardous properties of coal seams.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123443319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANALYSIS OF THE MAIN PARAMETERS OF LOW-AMPLITUDE FAULT DISTURBANCES IN COAL SEAMS AND SPATIAL IMAGE OF THE DISPLACER SURFACE","authors":"A. Merzlikin, D. Chepiga, I. Yefremov","doi":"10.31474/1999-981x-2022-1-81-85","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-1-81-85","url":null,"abstract":"Purpose. Carrying out a statistical analysis of the main parameters of low-amplitude discontinuous disturbances in a coal seam and restoring a spatial image of the disjunctive mixer surface. Methodology. Based on the results of a statistical sampling of data on small-scale disturbances of the coal seam, obtained directly from the field diary of the chief geologist of the mining enterprise, a classification of discontinuous disturbances of the coal seam by types, angle, dip azimuth and amplitude was made. A comparison was made of the recorded faults in the layers located at a small distance from each other, which made it possible to reproduce the spatial position of the fault and build the surface of its displacement. Results. Statistical data processing has shown that the majority of all faults are normal faults, and the dip angles of their faults range from 55 to 75º, while the dip azimuth of almost half of fault fault faults lies in the range of 0 – 100º. It can be seen from the distribution of the amplitude of disturbances that its indicator in the vast majority of tectonic discontinuities does not exceed 2 meters and, according to the conditions for the possibility of crossing discontinuities by clearing operations, such discontinuities pass with undercutting of side rocks by combines, which reduces the rate of feat and increases equipment wear. Originality. Comparison of faults recorded in formations located at a small distance from each other showed that their main parameters are very different at different horizons, due to which the spatial arrangement and the surface of the disjunctive mixer has a very complex shape, which does not allow predicting the location of the fault by simple geometric transfer from one layer to another. Practical value. The results obtained allow us to establish that the most common amplitude of tectonic faults is in the range from 0 to 2 m, the parameters of the same faults can change at different horizons, and the surface of the fault mixer is a complex geometric shape, which makes it impossible to simple transfer of the fault line from the upper to the lower layer, but requires the use of more efficient methods for predicting faults.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129559695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INCREASING THE ENERGY POTENTIAL OF COAL WHILE DEVELOPMENT OF LOW-THICKNESS RESERVES IN THE WESTERN DONBAS MINES","authors":"D. Malashkevych, M. Petlovanyi, K. Sai, P. Saik, I. Klymenko","doi":"10.31474/1999-981x-2022-2-67-77","DOIUrl":"https://doi.org/10.31474/1999-981x-2022-2-67-77","url":null,"abstract":"Purpose. Development and generalisation of a set of key elements for a non-waste technology concept of mining high-quality coal from thin coal seams, based on the processes of backfilling the mined-out space with waste rocks from stope and tunnelling operations. Methods. A comprehensive methodical approach, containing the systematisation and generalisation of the constituent elements of a non-waste coal mining technology based on the implementation of theoretical studies and substantiations, is used in the research. Findings. The main hypothesis of a new approach to non-waste coal mining has been formed, in which the priority is not only the process of leaving the maximum waste rock volume in underground cavities, but also its use to form backfill mass, thereby improving the geomechanical conditions for mining thin coal seams. A wide range of mining tasks has been formulated and systematised for using a non-waste coal mining technology. The conditions for the harmonious functioning of the proposed conceptual scheme of a non-waste coal mining technology within the extraction field boundaries have been determined and substantiated. The conceptual foundations for the functioning of a new highly efficient non-waste technology for mining high-quality thermal coal from thin coal seams have been developed. Originality. The scientific novelty is in revealing the mechanism for the effective logistic functioning of rock-transport systems for the accumulation of waste rocks in the underground space using a non-waste technology of coal mining from thin coal seams. Practical implications. The research results can be used in planning non-waste technological schemes for mining the coal with an increased energy potential.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"56 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126276849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"RESEARCH OF ELECTROMAGNETIC FIELD SCREENING TEXTILE MATERIAL WITH THE CONTENT OF FEROMAGNETIC NANOPARTICLES","authors":"L. Levchenko, M. Bahrii, N. Karaieva","doi":"10.31474/1999-981x-2019-2-94-99","DOIUrl":"https://doi.org/10.31474/1999-981x-2019-2-94-99","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128000546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF STYROLACRYLATE NANOCOMPOSITES ON FIRE PROTECTIVE EFFICIENCY OF INTUMESCENT TYPE REACTIVE COATING","authors":"L. Vakhitova, N. Taran, Konstantin Kalafat, S. Pridatko, A. Prudchenko, S. Podkopaev","doi":"10.31474/1999-981x-2019-1-87-99","DOIUrl":"https://doi.org/10.31474/1999-981x-2019-1-87-99","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134052671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DEVELOPMENT OF SCALES FOR ASSESSMENT MATRICES OF OCCUPATIONAL RISKS","authors":"Vitaly Tsopa, Serhii Cheberyachko, Yurii Cheberyachko, Oleg Deryugin, Nadiia Sushko","doi":"10.31474/1999-981x-2023-1-109-117","DOIUrl":"https://doi.org/10.31474/1999-981x-2023-1-109-117","url":null,"abstract":"Purpose. To justify the procedure for developing scales for building a matrix of professional risk assessment.\u0000\u0000Methodology. To build a professional risk assessment matrix, we used the recommendations given in DSTU ISO 73:2013 “Risk Management. Glossary of terms (ISO Guide 73:2009 Risk management – Vocabulary), in which, in order to build a matrix of professional risks, it is assumed to determine the category of consequences of a dangerous event with an assessment of their plausibility and the frequency of occurrence of a dangerous event, which allows determining the “probability” scale. \u0000\u0000Results. An approach to building a matrix of professional risks has been developed, which consists of three main stages: the first is defining the terms and concepts of the matrix of professional risks and their understanding; the second is determining the value of the scale of frequency (or probability) and severity of the consequences of a dangerous event (incident) with full understanding by company employees of the requirements for their assessment and use, based on statistical data and medical definitions of the type and type of injuries, stages of occupational diseases; the third is defining criteria for assessing occupational risks in accordance with standards, laws, policies, experience and specific requirements set by the organization itself (for example, to achieve a level of “zero” injuries). An example of the assessment of the professional risks of a turner’s job of processing a shaft blank with the development of appropriate forms for assessing the frequency (probability) of the occurrence of a dangerous event (injury of an employee’s limb) and the severity of the consequences (limb fracture) for risk calculation and its documentation is given. The main causes of the dangerous event that occurred with a turner due to the worker’s sleeve being caught were determined. The risk assessment algorithm is described, which consists of five steps: identification of the hazard, determination of the frequency or probability of occurrence of a dangerous event and the severity of the injury, assessment of occupational risks, substantiation of precautionary measures and verification of the obtained risk value.\u0000\u0000Scientific novelty. The approach to the calculation of professional risk is substantiated by determining the frequency of occurrence of a dangerous event and the severity of the consequences of its occurrence, with the justification of risk management actions. \u0000\u0000Practical significance. The proposed template of a typical professional risk matrix with criteria for scales of the frequency of occurrence of a dangerous event and the severity of its consequences.","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134240158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DEVELOPMENT AND INVESTIGATION OF PROTECTIVE PROPERTIES OF METAL-CASTIC ELECTROMAGNETIC SCREEN","authors":"O. Tykhenko, M. Bahrii, L. Levchenko, Oleksiy Khodakovskyy, D. Rieznik","doi":"10.31474/1999-981X-2019-1-100-106","DOIUrl":"https://doi.org/10.31474/1999-981X-2019-1-100-106","url":null,"abstract":"","PeriodicalId":344647,"journal":{"name":"JOURNAL of Donetsk mining institute","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115573645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}