Vol 21, No 2 (2020)

Earth science
Geological and mining features of gold deposits development of Ryabinovoe gold deposit
Ryzhov S.V., Rylnikova M.V., Esina E.N.
Abstract

The significant role of the gold mining industry in the development of the Russian mineral resource system determines the search for new organizational, technical and geotechnical solutions to improve the completeness and efficiency of deposit development. Most of Russia's gold deposits are in remote, sparsely populated areas, where there is a lack of energy, transport communications, and infrastructure. It is shown that the Ryabinovoe gold deposit, located in the Republic of Sakha (Yakutia), is characterized by a complex structure, relatively low occurrence of ore deposits and a widespread in the value of mineral raw materials. Features of the Ryabinovoe deposit consist in a complex structural structure and alternation of mineralized gold-bearing and low-gold-bearing or ore-free areas of various capacities and complex morphology. The main criteria for open Geotechnology have been clarified and justified. This ensures safe and efficient development of the Ryabinovoe field with the achievement of the maximum possible total discounted income and the shortest recoupment period for the project. In general, an integrated approach is the basis of the development strategy of the Ryabinovoe gold deposit. It includes increasing the level of extraction of useful components, increasing the production volume and a differentiated approach to the choice of a method for processing ores of different quality. It is shown that the achievement of rational production capacity in the complex development of the Ryabinovoe gold deposit is based on optimizing the variation of the onboard and average gold content with justification of the ratio of production capacity of the mining and processing cycle.

RUDN Journal of Engineering Researches. 2020;21(2):113-122
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Some peculiarities of the polarization structure of the electromagnetic field at high frequencies in geological sections: mathematical solutions and experiments
Abramov V.Y.
Abstract

The effects of induced polarization (IP) in the ore bodies and host rocks in the frequencies above 1 000 000 Hz were considered. The phase response of the complex resistivity (CR) system equipment “Geozond” have been explored instrumentally. The reliability of high-frequency IP measurements was confirmed by independent verification by mining activities. The results confirm the presence of IP effects in the ore bodies and host rocks. They suggest the necessity to account for IP effects in the interpretation of electromagnetic data, in particular, in induction logging data. The purpose of mathematical computer modeling in this work was to study the propagation of a high frequency electromagnetic field from a linear current source in a material medium by solving Maxwell's equations using finite-difference approximations (iterations) in the time domain. The measurement results were processed according to a well-known scheme, using the method of iterative selection in automatic mode. This allows to use this method for end-to-end calculation of electromagnetic fields in complex three-dimensional inhomogeneous structures.

RUDN Journal of Engineering Researches. 2020;21(2):123-130
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Mechanical engineering and power-plant
Effect of fixing the pass-through turning tool in the tool holder on the roughness and surface macro deviations during turning
Allenov D.G., Deinova K.B., Solomatin S.V., Lazarenko O.I.
Abstract

The scientific work represents a research of the cutting process in order to determine the influence of the cutting tool extension’s length from the tool holder and the cutting forces that occur during processing and corresponding to different values of the removed layer on the formation of the quality of the surface layer of parts during turning. As a cutting tool, the research used a PCLNR2525M12 straight-turning tool with replaceable T15K6 carbide inserts. Steel cylindrical workpieces with a diameter D = 40 mm (steel grade - 30) were used as workpieces. Cutting was carried out at three different cutting depths: 0.4, 1, 1.5 mm. The feed rate and spindle speed throughout the experiment were constant and were equal to s = 0.1 mm/rev, n = 1000 rpm, respectively. The geometric deviations of the cutter from the theoretical cutting line were determined by mathematical modeling methods. Linear displacements formed due to the stress-strain state of the cutter were used as estimated parameters. The study presents the methodology for preparing and conducting mathematical modeling using the three-dimensional modeling system KOMPAS-3D and APM FEM module. The roughness parameters that occur during turning by cutters with different tool extension with different cutting modes were studied experimentally.

RUDN Journal of Engineering Researches. 2020;21(2):105-112
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Civil Engineering (Construction)
“Renaissance” of intellectual capital, which is displayed in non-traditional (innovative) methods at forming in architectural systems
Pleshivtsev A.A., Galishnikova V.V.
Abstract

The research has established the main features of the current state and prospects for the development of intellectual resources (capital), which can lead to the formation of a new level of qualitative and quantitative indicators of traditional and non-traditional architectural systems. The article presents the conceptual apparatus of the phenomenon of “Renaissance of intellectual capital” as a modern form of development of intangible assets and a way to implement innovative technologies (from various fields of knowledge) in the process of architectural creativity. The features of the state and development of intellectual capital for solving architectural problems and construction practices of past historical epochs are considered. An algorithm for solving non-standard problems of architectural creativity (non-traditional, problematic situations) with the involvement of an intellectual resource has been developed. It is established that the intellectual resource is the basis of research and practical innovation, which is carried out in the specific context of the formation of non-traditional architectural systems, methods and methods to ensure the level of their manufacturability (design, manufacture, transportation, construction, operation). The availability of intellectual resources is a key factor in providing the necessary competitive advantages over traditional architectural systems and ways to organize them into architectural objects.

RUDN Journal of Engineering Researches. 2020;21(2):131-135
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Helicoids 3D modeling for additive technologies
Jean Paul V., Elberdov T.A., Rynkovskaya M.I.
Abstract

The article provides an analysis of modern and affordable software systems for modelling shells of complex geometry and the possibilities of using these software systems in 3D printing. Such an analysis made it possible to choose software systems that most accurately allow for the implementation of the 3D modeling method proposed in the article with subsequent printing on a 3D printer. This method is considered in detail on the example of constructing several types of helicoids. The process of 3D modeling of a helicoid is described step by step and is divided into several stages: parametric modeling of a helicoid in SCAD, editing of the resulting model in AutoCAD and its export to a special format for 3D printing. The use of the method of parametric modeling is due to its accuracy and uncompromisingness. With its help, one can accurately judge the type of the built surface. Parametric modeling is the construction of a surface by compiling equations on each axis, i.e. along the x, y, z axes, and for each type of surface there are specific characteristic equations. It is not possible to implement the method of parametric modeling in all software systems; in this connection, certain difficulties arise. The article analyzes the difficulties encountered in 3D modeling of the helicoid and suggests ways to solve them.

RUDN Journal of Engineering Researches. 2020;21(2):136-143
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Adhesion to concrete of new types of rebar rolled products for construction
Okolnikova G.E., Tikhonov G.I., Grishin G.E.
Abstract

This article discusses the background and history of the emergence of innovative, popular today, types of rebar for construction, their distinctive features and quality indicators, the methodology and results of various studies conducted on the basis of NIIZHB named after A.A. Gvozdev of JSC Research Center of Construction and LLC “Technological Institute ‘VNIIzhelezobeton’ ”. The purpose of this article is to introduce new types of innovative rebar products and demonstrate their advantages. For the tests, the results and methods of which are given in the article, test rolls of rebar with a four-row screw profile were made. In terms of strength and deformability of adhesion to concrete, the reinforcement with multi-row (four-row and six-row) reinforcement profiles significantly surpassed the reinforcement with two-row crescent (European) and screw (GEWI-Stahl analog) profiles. It has demonstrated high adhesion to concrete not only in the operational, but also in the extreme stage of deformation of the reinforcement. This article discusses the background and history of the emergence of innovative, popular today, types of rebar for construction, their distinctive features and quality indicators, the methodology and results of various studies conducted on the basis of NIIZHB named after A.A. Gvozdev of JSC Research Center of Construction and LLC “Technological Institute ‘VNIIzhelezobeton’ ”. The purpose of this article is to introduce new types of innovative rebar products and demonstrate their advantages. For the tests, the results and methods of which are given in the article, test rolls of rebar with a four-row screw profile were made. In terms of strength and deformability of adhesion to concrete, the reinforcement with multi-row (four-row and six-row) reinforcement profiles significantly surpassed the reinforcement with two-row crescent (European) and screw (GEWI-Stahl analog) profiles. It has demonstrated high adhesion to concrete not only in the operational, but also in the extreme stage of deformation of the reinforcement.

RUDN Journal of Engineering Researches. 2020;21(2):144-152
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