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Geotechnical Engineering and Engineering Geology
  • Date submitted
    2023-12-07
  • Date accepted
    2024-11-07
  • Date published
    2025-04-25

Determination of the tangential component of cutting resistance during frozen sedimentary rock cutting using blocked, deeply blocked and cell cutting methods

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Due to the insufficient accuracy of existing studies of frozen sedimentary rock cutting process for practical calculations, the article solves the problem of determining the tangential component cutting resistance for blocked, deep blocked and cell cutting, which are currently the most commonly used methods in earthmoving equipment. The cutting tool and rock mass force interaction is considered from the point of view of the emerging stresses, which act on the separated chip element. The analytical dependences for determining the tangential component of cutting resistance were obtained. The numerical explanation of the choice of cell cutting in relation to blocked and deeply blocked cutting is given. For all three methods of cutting, under equal geometrical parameters of the cutting tool and the physical and mechanical properties of the frozen rock, the numerical value of the tangential component of cutting resistance is obtained. The comparison of the cutting resistance estimated values has shown that cell cutting requires relatively less energy and is preferred during the process of frozen sedimentary rock excavation. During field and laboratory investigations with the use of a multi-purpose cutting stand, a sufficient convergence of the analytical statements with the physics of frozen sedimentary rock cutting process was established. The results of the research allow a more reasonable approach to the adjustment of existing methods for determining the required tractive force and power for the drive of an excavation machine, and, therefore, to the actual efficiency and profitability of work.

How to cite: Shemyakin S.A., Shishkin E.A. Determination of the tangential component of cutting resistance during frozen sedimentary rock cutting using blocked, deeply blocked and cell cutting methods // Journal of Mining Institute. 2025. Vol. 272 . p. 136-144. EDN FRCVVZ
Energy industry
  • Date submitted
    2024-04-11
  • Date accepted
    2024-11-07
  • Date published
    2025-04-25

Thyristor booster device for voltage fluctuation reduction in power supply systems of ore mining enterprises

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The article is devoted to solving the problem of voltage fluctuations in the power supply systems of ore mining enterprises. The connection of high-power consumers with abruptly variable operating mode (for example, high-voltage mining excavators) causes voltage fluctuations and sags, disabling electrical equipment, communication, and automation devices in the 6-10 kV distribution network, which disrupts technological processes, etc. The use of existing solutions and methods to reduce voltage variations caused by dynamic loads is not effective. To solve the problem, booster transformers with high-speed thyristor switches can be used to work out switching the control steps towards increasing or decreasing the voltage. The authors offer a new circuitry solution for a thyristor booster device (TBD) with a pulse-phase control method. The purpose of the research is to determine the control laws of TBD, which enable to effectively reduce voltage fluctuations from dynamic load in the power supply systems of mining enterprises. The article provides a schematic diagram of the TBD and describes the principle of operation of the device. Some modes of increasing and decreasing the output voltage of the TBD, as well as the basic mode (without voltage addition) are provided. Mathematical modeling of TBD control processes was carried out and adjustment characteristics were set taking into account the load power factor. On a simulation computer model of a 6 kV electric network with a dynamic load, the verification of the adjustment characteristics of TBD obtained during mathematical modeling was carried out. Based on the research results, the laws for regulating the output voltage of TBD were established. The TBD effective control range with normal permissible limits of odd harmonics have been determined. The conducted research will make it possible to implement the device control system.

How to cite: Sosnina E.N., Asabin A.A., Bedretdinov R.S., Kryukov E.V., Gusev D.A. Thyristor booster device for voltage fluctuation reduction in power supply systems of ore mining enterprises // Journal of Mining Institute. 2025. Vol. 272 . p. 159-170. EDN UIBVZK
Energy industry
  • Date submitted
    2023-03-12
  • Date accepted
    2023-06-20
  • Date published
    2023-07-19

Increasing the energy efficiency of an autonomous power supply system of a drilling rig in case of voltage dips

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The article discusses the emergency modes of operation of an autonomous electrical complex of a drilling rig. The concept of voltage failure and its influence on the technological process of industrial enterprises is revealed. A description of the methods used in the power supply of industrial enterprises to overcome voltage dips and load surges in autonomous power systems is presented, from which it is possible to single out the accelerated lifting of critical equipment to prevent emergency conditions, as well as the use of backup storage, usually batteries. An algorithm has been developed for the interaction of the battery and the diesel generator set as backup power sources during various modes of operation of the electric motor, taking into account load surges, which allows successfully overcoming voltage dips in the system both in transient and in steady state. It is proposed to use a combined method to eliminate the voltage dip, a feature of which is the use of a combined structure of backup power sources as part of a diesel generator set and a battery, acting on the base of the proposed interaction algorithm in autonomous electrical complexes. The method makes it possible to overcome sudden load surges and voltage dips caused by a shortage of reserve power in the electrical system. The use of a rechargeable battery as a transitional element makes it possible to switch between the main and backup power sources without stopping the technological one and to expand the overload threshold of an autonomous electrical complex up to 60 %. The use of the combined method increases the energy efficiency of the autonomous complex due to a reduction in the number of emergency shutdowns of equipment, process interruptions and additional power consumption.

How to cite: Chervonchenko S.S., Frolov V.Y. Increasing the energy efficiency of an autonomous power supply system of a drilling rig in case of voltage dips // Journal of Mining Institute. 2023. Vol. 261 . p. 470-478. EDN MGAPVA
Modern Trends in Hydrocarbon Resources Development
  • Date submitted
    2021-09-01
  • Date accepted
    2022-10-07
  • Date published
    2022-12-29

Parameter determination of the method of directional unloading of the reservoir based on physical modelling on a true triaxial loading setup

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The article presents a theoretical and experimental substantiation of the method of directional unloading of the reservoir in fields with low-permeability reservoirs. The relevance of the article is due to the reduction of hydrocarbon resources in modern conditions and the need to create new efficient environmentally friendly technologies to develop hydrocarbon deposits with hard-to-recover reserves, primarily with low-permeability reservoirs. The results of a theoretical study of the stress-strain state in the vicinity of a well, both cased and open, are presented. They are necessary to develop programs for laboratory testing of core specimens from the studied fields. A technique for physical modelling of deformation processes in the bottomhole zone with a decrease in pressure at the well bottom in a true triaxial loading unit is described in order to determine the parameters of the process impact on the formation reservoir, leading to an increase in well productivity. The method was applied to the conditions of the low-permeability reservoir at the Verkhneviluchanskoye oil and gas condensate field in the southwest of the Republic of Sakha (Yakutia). Expe-rimental studies were carried out on a unique scientific unit for true triaxial loading, created at the IPMech RAS, the Triaxial Independent Loading Test System. The directional unloading method was adapted for the studied field, the process parameters of successful application of the method were determined: the bottomhole design, the drawdown values necessary to increase the permeability of the bottomhole formation zone.

How to cite: Karev V.I., Kovalenko Y.F., Khimulia V.V., Shevtsov N.I. Parameter determination of the method of directional unloading of the reservoir based on physical modelling on a true triaxial loading setup // Journal of Mining Institute. 2022. Vol. 258 . p. 906-914. DOI: 10.31897/PMI.2022.95
Geotechnical Engineering and Engineering Geology
  • Date submitted
    2022-05-18
  • Date accepted
    2022-07-21
  • Date published
    2022-11-10

Improving the method for assessment of bending stresses in the wall of an underground pipeline

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Brief information about modern methods for determining the bending stresses of the extended sections of underground main pipelines without access to the pipeline generatrix is given. The necessity of modernizing methods based on determining the configuration of the pipeline axis from the soil surface with subsequent calculation of bending stresses based on the obtained data is substantiated. A mathematical model that allows to calculate the optimal parameters for surveying the axis of the pipeline from the soil surface for a pipeline of arbitrary configuration and depth, when planning a study, is proposed. Bench tests of the BITA-1 pipeline finder were carried out to determine the error in measuring the depth of the pipeline axis. It is proved that the deviations of the pipeline finder data relative to the true values in narrow depth intervals follow a normal distribution and do not change their sign. The confidence intervals of the error in determining the depth of the pipeline axis for the BITA-1 device are presented.

How to cite: Aginey R.V., Firstov A.A. Improving the method for assessment of bending stresses in the wall of an underground pipeline // Journal of Mining Institute. 2022. Vol. 257 . p. 744-754. DOI: 10.31897/PMI.2022.64
Geology
  • Date submitted
    2021-12-21
  • Date accepted
    2022-06-20
  • Date published
    2022-11-10

Scientific justification of the perforation methods for Famennian deposits in the southeast of the Perm Region based on geomechanical modelling

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The article presents the results of analysing geological structure of the Famennian deposits (Devonian) in the Perm Region. Numerical modelling of the distribution of inhomogeneous stress field near the well was performed for the two considered types of perforation. With regard for the geometry of the forming perforation channels, numerical finite element models of near-wellbore zones were created considering slotted and cumulative perforation. It is ascertained that in the course of slotted perforation, conditions are created for a significant restoration of effective stresses and, as a result, restoration of reservoir rock permeability. Stress recovery area lies near the well within a radius equal to the length of the slots, and depends on the drawdown, with its increase, the area decreases. From the assessment of failure areas, it was found that in case of slotted perforation, the reservoir in near-wellbore zone remains stable, and failure zones can appear only at drawdowns of 10 MPa and more. The opposite situation was recorded for cumulative perforation; failure zones near the holes appear even at a drawdown of 2 MPa. In general, the analysis of results of numerical simulation of the stress state for two simulated types of perforation suggests that slotted perforation is more efficient than cumulative perforation. At the same time, the final conclusion could be drawn after determining the patterns of changes in permeability of the considered rocks under the influence of changing effective stresses and performing calculations of well flow rates after making the considered types of perforation channels.

How to cite: Chernyshov S.E., Popov S.N., Varushkin S.V., Melekhin A.A., Krivoshchekov S.N., Ren S. Scientific justification of the perforation methods for Famennian deposits in the southeast of the Perm Region based on geomechanical modelling // Journal of Mining Institute. 2022. Vol. 257 . p. 732-743. DOI: 10.31897/PMI.2022.51
Mining
  • Date submitted
    2020-07-30
  • Date accepted
    2021-03-02
  • Date published
    2021-04-26

Experimental study of thermomechanical effects in water-saturated limestones during their deformation

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Stability control of elements of stone constructions of various structures is a prerequisite for their safe operation. The use of modern methods of non-destructive diagnostics of the stress-strain state of such constructions is an effective, and in many cases the only way to control it. Studies of thermal radiation accompanying the processes of solid bodies deformation allowed to justify and develop a method that allows to obtain non-contact information about changes in the stress-strain state in various types of geomaterials, including limestones. However, studies of the water saturation influence of rocks on the thermal radiation parameters recorded in this way are currently superficial. Taking into account the water saturation degree of rocks is necessary when monitoring the mechanical condition of stone structures that are in direct contact with water. The main purpose of this work is to study the dependences of changes in the intensity of thermal radiation from the surface of limestone samples with different humidity under conditions of uniaxial compression. The obtained results showed the expected significant decrease in the mechanical properties (uniaxial compressive strength and elastic modulus) of water-saturated samples in comparison with dry ones. At the same time, a significant increase in the intensity of thermal radiation of limestone samples subjected to compression with an increase in their water saturation was recorded, which makes it necessary to take into account the revealed regularity when identifying changes in the stress state of stone structures established according to non-contact IR diagnostics in real conditions.

How to cite: Blokhin D.I., Ivanov P.N., Dudchenko O.L. Experimental study of thermomechanical effects in water-saturated limestones during their deformation // Journal of Mining Institute. 2021. Vol. 247 . p. 1-10. DOI: 10.31897/PMI.2021.1.1
Electromechanics and mechanical engineering
  • Date submitted
    2021-01-20
  • Date accepted
    2021-03-15
  • Date published
    2021-04-26

Improving the quality of electricity in the power supply systems of the mineral resource complex with hybrid filter-compensating devices

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The urgency and necessity of choosing and justifying the structures of hybrid filter-compensating devices based on series and parallel active filters to improve the quality of electricity in the power supply systems of enterprises of the mineral resource complex is shown. Mathematical models of hybrid filter compensating devices based on parallel and series active filters have been developed. Based on these mathematical models, computer simulation models of the indicated hybrid structures have been developed. The results of simulation showed the effectiveness of the correction of power quality indicators in terms of reducing the level of higher harmonics of current and voltage, as well as voltage deviations. The degree of influence of filter-compensating devices on the power quality indicators, which determine the continuity and stability of the technological process at the enterprises of the mineral resource complex, have been revealed. It has been established that a hybrid filter-compensating device based on a parallel active filter can reduce the level of higher harmonics of current and voltage by more than 90 and 70 %, respectively, and based on a series active filter, it can reduce the level of higher harmonics of voltage by more than 80 %. Based on the simulation results, the possibility of compensating for the reactive power of a hybrid structure based on parallel active and passive filters has been revealed. The possibility of integrating hybrid filter-compensating devices into more complex multifunctional electrical systems for the automated improvement of the quality of electricity is substantiated, as well as the expediency and prospects of their use in combined power supply systems based on the parallel operation of centralized and autonomous sources of distributed generation.

How to cite: Sychev Y.A., Zimin R.Y. Improving the quality of electricity in the power supply systems of the mineral resource complex with hybrid filter-compensating devices // Journal of Mining Institute. 2021. Vol. 247 . p. 132-140. DOI: 10.31897/PMI.2021.1.14
Oil and gas
  • Date submitted
    2020-05-29
  • Date accepted
    2020-09-16
  • Date published
    2020-11-24

Numerical modeling of a double-walled spherical reservoir

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Extensive and important class of multilayer shell structures is three-layer structures. In a three-layer structure, a rigid filler plays an important role, due to which the bearing layers are spaced that gives the layer stack high rigidity and durability with a relatively low weight. By combining the thicknesses of the bearing layers and the filler, the desired properties of a three-layer shell structure can be achieved. Compared with traditional single-walled, three-layer construction has increased rigidity and durability, which allows reducing the thickness and weight of the shells. In order to reduce the metal content of the spherical reservoir for storing liquefied gases, this work considers the design of a double-walled reservoir, in which the inter-wall space is filled with reinforced polyurethane. Numerical modeling made it possible to determine the parameters of the stress-strain state of the structure with an error of no more than 5 %. It has been established on the example of a reservoir with a volume of 4000 m 3 that the spatial structure of the spherical reservoir wall can reduce the metal content up to 19 %. Field of application for the research results is the assessment of the stress-strain state of spherical reservoirs at their designing. Method for building the structure of a double-walled spherical reservoir in the SCAD software has been developed, which allows calculating the stress-strain state (SSS) by the finite element method. Numerical model of a double-walled spherical reservoir has been developed. It was found that to obtain calculation results with an error of P ≤ 5 % the size of the final element should not exceed 300×300×δ mm. Design of a double-walled spherical reservoir was investigated. Design parameters have been established to ensure the operational reliability of the structure with a decrease in metal content in comparison with a single-wall reservoir by 19 %.

How to cite: Karavaichenko M.G., Gazaleev L.I. Numerical modeling of a double-walled spherical reservoir // Journal of Mining Institute. 2020. Vol. 245 . p. 561-568. DOI: 10.31897/PMI.2020.5.8
Electromechanics and mechanical engineering
  • Date submitted
    2020-06-15
  • Date accepted
    2020-06-15
  • Date published
    2020-06-30

Multi-terminal dc grid overall control with modular multilevel converters

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This paper presents a control philosophy for multiterminal DC grids, which are embedded in the main AC grid. DC transmission lines maintain higher power flow at longer distances compared with AC lines. The voltage losses are also much lower. DC power transmission is good option for Russian north. Arctic seashore regions of Russia don't have well developed electrical infrastructure therefore power line lengths are significant there. Considering above it is possible to use DC grids for supply mining enterprises in Arctic regions (offshore drilling platforms for example). Three different control layers are presented in an hierarchical way: local, primary and secondary. This whole control strategy is verified in a scaled three-nodes DC grid. In one of these nodes, a modular multilevel converter (MMC) is implemented (five sub-modules per arm). A novel model-based optimization method to control AC and circulating currents is discussed. In the remaining nodes, three-level voltage source converters (VSC) are installed. For their local controllers, a new variant for classical PI controllers are used, which allow to adapt the values of the PI parameters with respect to the measured variables. Concerning the primary control, droop control technique has been chosen. Regarding secondary level, a new power flow technique is suggested. Unbalance conditions are also verified in order to show the robustness of the whole control strategy.

How to cite: Jiménez Carrizosa M., Stankovic N., Vannier J.-C., Shklyarskiy Y.E., Bardanov A.I. Multi-terminal dc grid overall control with modular multilevel converters // Journal of Mining Institute. 2020. Vol. 243 . p. 357-370. DOI: 10.31897/PMI.2020.3.357
Electromechanics and mechanical engineering
  • Date submitted
    2020-01-09
  • Date accepted
    2020-01-26
  • Date published
    2020-02-25

Mining excavator working equipment load forecasting according to a fuzzy-logistic model

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Due to the fact that the loads occurring in the working equipment of mining excavators are determined by a large number of random factors that are difficult to represent by analytical formulas, for estimating and predicting loads the models must be introduced using non-standard approaches. In this study, we used the methodology of the theory of fuzzy logic and fuzzy pluralities, which allows to overcome the difficulties associated with the incompleteness and vagueness of the data in assessing and predicting the forces encountered in the working equipment of mining excavators, as well as with the qualitative nature of these data. As a result of computer simulation in the fuzzyTECH environment, data comparable with experimental studies were obtained to determine the level of loading of the main elements of the working equipment of mining excavators. Based on a representative sample, a statistical analysis of the data was performed, as a result of which the equation of linear multiple stress regression in the handle of mining excavators was obtained, which allows to make an accurate forecast of the loading of the working equipment of the excavator.

How to cite: Velikanov V.S. Mining excavator working equipment load forecasting according to a fuzzy-logistic model // Journal of Mining Institute. 2020. Vol. 241 . p. 29-36. DOI: 10.31897/PMI.2020.1.29
Electromechanics and mechanical engineering
  • Date submitted
    2019-03-31
  • Date accepted
    2019-08-25
  • Date published
    2020-02-25

Cascade frequency converters control features

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The structures of systems with high-voltage cascade frequency converters containing multi-winding transformers and low-voltage low-power converters connected in series at each output phase of the load are considered. Low-voltage blocks contain three-phase diode or active rectifiers, DC capacitor filters, single-phase stand-alone voltage inverters and block disconnecting devices in partial modes (in case of failure when part of the blocks are disconnected). The possibilities of operation of cascade converters are determined, equations for correcting tasks to units in partial modes are given, tables of correction of tasks with estimates of achievable load characteristics are proposed. The results of experiments on the model of a powerful installation with a cascade frequency converter are presented, confirming the possibility of ensuring the symmetry of the load currents when disconnecting part of the blocks and the asymmetry of the circuit.

How to cite: Vorontsov A.G., Glushakov V.V., Pronin M.V., Sychev Y.A. Cascade frequency converters control features // Journal of Mining Institute. 2020. Vol. 241 . p. 37-45. DOI: 10.31897/PMI.2020.1.37
Oil and gas
  • Date submitted
    2020-01-09
  • Date accepted
    2020-01-20
  • Date published
    2020-02-25

Mechanical Properties of Sandstone using non-Destructive Method

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The understanding of physical and mechanical properties of rock is considered as critical in drilling, geo-engineering, and construction applications. As an example, the awareness of these rock parameters contributes to avoid or minimizing instability around the wellbore while drilling. The laboratory experiment of understanding of these parameters can be done in two-different ways: static, where the sample subjects to destruction after the test and dynamic, known as non-destruction method. The non-destructive method using ultrasonic waves under a series of different stress conditions, starting from 7 to 56 MPa with incrementation of 7MPa, has been used in this paper in order to characterize the mechanical properties of dry Zbylutów sandstone at 20 and 80°C. The velocity of primary (P) and secondary (S) waves within these ranges has been recorded in order to understand the behavior of the mechanical properties. The results showed that the Young’s modulus, bulk modulus, shear modulus, and Lame’s constant of Zbylutów sandstone have a positive correlation with good coefficient correlation with the increased stress, while the Poisson’s ratio showed a negative correlation. Besides, the effect of temperature on the rock parameters is approved by the decrease of primary wave velocity in this two-different temperature range. Such results are necessary when preparing the appropriate mud weight for drilling process, which is related to wellbore instability.

How to cite: Rajaoalison H., Zlotkowski A., Rambolamanana G. Mechanical Properties of Sandstone using non-Destructive Method // Journal of Mining Institute. 2020. Vol. 241 . p. 113-117. DOI: 10.31897/PMI.2020.1.113
Electromechanics and mechanical engineering
  • Date submitted
    2019-05-07
  • Date accepted
    2019-07-11
  • Date published
    2019-10-23

Operation of a Single-phase Autonomous Inverter as a Part of a Low-power Wind Complex

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The article discusses the experience of operating a wind power complex with a low-power wind power installa- tion (5 kW), the use of which is promising for powering remote oil production facilities, exploration and other types of mining operations. The structure of the studied complex and its characteristics, technical problems that have arisen during operation for 6 years are given. The elements of the wind energy complex – the battery charge regulator and the inverter-converter are considered. The consequences of the mechanical regulator failure of battery charge are con- sidered and recommendations for its replacement are presented. The issues of diagnostics and repair of one of the main elements of the complex – the inverter-converter, its component – DC link are highlighted in detail. Oscil- lograms of the output voltage of the inverter-converter are presented for different capacities of the DC link and the images of the repaired inverter-converter are given. Recommendations are given on choosing an inverter-converter and setting up the operating modes of the wind energycomplex.

How to cite: Belsky A.A., Dobush V.S., Haikal S.F. Operation of a Single-phase Autonomous Inverter as a Part of a Low-power Wind Complex // Journal of Mining Institute. 2019. Vol. 239 . p. 564-569. DOI: 10.31897/PMI.2019.5.564
Electromechanics and mechanical engineering
  • Date submitted
    2018-12-25
  • Date accepted
    2019-03-02
  • Date published
    2019-06-25

Non-linear electrical load location identification

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The article discusses the issues of identifying the location of non-linear loads in electrical networks which makes the main contribution to the distortion of the non-sinusoidal voltage and current in the distribution network of an industrial enterprise, including mining enterprises. The existing methods for determining the location of the source of higher harmonic components in voltage and current are considered, their advantages and disadvantages are revealed. The main disadvantages of the methods used include the low accuracy and incorrectness of their use in existing enterprises. When developing a new method, the authors were faced with the task of simplicity of its use in the conditions of industrial operation of electrical equipment and the absolute correctness of the results obtained. The proposed method of identifying the source of higher harmonics is based on the variation of the parameters of the power system, in particular, the change in resistance of power transformers taking into account their transformation ratio. It is shown that by varying the transformation ratio during regulation under load, the total coefficient of the harmonic components of the voltage changes. Based on the constructed dependencies, the variation of the derivative of this function with different variations of the parameters of sources of higher harmonics is analyzed and a method is developed that allows determining the share contribution of consumers to the total harmonic component of the voltage.

How to cite: Pirog S., Shklyarskiy Y.E., Skamyin A.N. Non-linear electrical load location identification // Journal of Mining Institute. 2019. Vol. 237 . p. 317-321. DOI: 10.31897/PMI.2019.3.317
Electromechanics and mechanical engineering
  • Date submitted
    2018-10-27
  • Date accepted
    2019-01-04
  • Date published
    2019-04-23

Application of an active rectifier used to mitigate currents distortion in 6-10 kV distribution grids

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The paper addresses issues of using the active rectifier in partially loaded variable frequency drive as active filter in the conditions of non-sinusoidal current and voltage disturbances caused by the presence of high-power non-linear load in the grid. The topology of transformless three-level converter for 6-10 kV suitable for proposed solution has been presented and its mathematical model has been de-rived. Based on the model, the direct power control algorithm with ability to compensate non-linear currents has been designed. The investigation of active rectifier efficiency was performed depending on the relation between linear and non-linear load currents of the grid node, as well as on active power load of the active rectifier. Efficiency analysis was based on the developed computer model of the grid node with connected non-linear load simultaneously with the variable frequency drive with active rectifier.

How to cite: Solovev S.V., Kryltcov S.B., Munoz-Guijosa J.M. Application of an active rectifier used to mitigate currents distortion in 6-10 kV distribution grids // Journal of Mining Institute. 2019. Vol. 236 . p. 229-238. DOI: 10.31897/PMI.2019.2.229
Oil and gas
  • Date submitted
    2018-06-27
  • Date accepted
    2018-08-31
  • Date published
    2018-12-21

Numerical modeling of a stress-strain state of a gas pipeline with cold bending offsets according to in-line inspection

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Knowledge of the current stress-strain state of any section of the pipeline allows you to make informed decisions on its operation, maintenance and repair, as well as on the prediction of the technical condition. The task of determining the characteristics of the stress-strain state of a gas pipeline section that has cold bend offsets (CBO) according to in-line inspection (ILI) is considered. The bent part of CBO is characterized by the presence of residual stresses and deformations in the wall of the offset, which contribute to the overall level of the stress-strain state of the gas pipeline operating under external and internal loads. Using the results of in-line diagnostics, numerical modeling and a solution, the change in the values of longitudinal stresses, is determined and the need to take into account residual stresses in the zone of elastic-plastic deformations of cold bend offsets is shown.

How to cite: Korobkov G.E., Yanchushka A.P., Zakiryanov M.V. Numerical modeling of a stress-strain state of a gas pipeline with cold bending offsets according to in-line inspection // Journal of Mining Institute. 2018. Vol. 234 . p. 643-646. DOI: 10.31897/PMI.2018.6.643
Electromechanics and mechanical engineering
  • Date submitted
    2016-11-14
  • Date accepted
    2017-01-09
  • Date published
    2017-04-14

Method of restoring strength determination test

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The main requirements for an electric unit at the stages of its design, development, production and usage are described in technical specifications (TS) and standards (GOST). The electric unit should work in accordance with a specific purpose and have significant reliability, durability and safety. The reliability and durability of electric unit significantly depends on restoring strength speed value, that is growth of breakage voltage in arc pass for eliminating repeated arc strike. This article describes several methods of test identification of restoring strength, which were carried out at special testing laboratory units. They are described in relation to conditions of measuring the residual arc column of AC current after it reaches zero point and can be used in designing arc blowout units of low voltage.

How to cite: Apollonskii S.M., Kuklev Y.V. Method of restoring strength determination test // Journal of Mining Institute. 2017. Vol. 224 . p. 235-239. DOI: 10.18454/PMI.2017.2.235
Electromechanics and mechanical engineering
  • Date submitted
    2015-08-03
  • Date accepted
    2015-10-03
  • Date published
    2016-04-22

The method for synthesis of power supply system topology of mineral resources enterprises on the basis of logical and probabilistic assessments

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A method for the synthesis of the power supply system topology of mineral resources enterprises. The expediency of using general logic probabilistic method and developed on the its basis software «ARBITR» to calculate the reliability of power supply systems. The synthesis results of power supply system topology on the example of underground mining and gas transmission systems consumers. Recommendations to improve the power supply reliability of mineral resources enterprises.

How to cite: Abramovich B.N., Baburin S.V. The method for synthesis of power supply system topology of mineral resources enterprises on the basis of logical and probabilistic assessments // Journal of Mining Institute. 2016. Vol. 218 . p. 233-241.
Geo-nanomaterials
  • Date submitted
    2015-08-13
  • Date accepted
    2015-10-29
  • Date published
    2016-04-22

Multicriteria estimation of bearing capacity of geomaterials

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In the article the problem of an estimation of bearing capacity of geomaterials as a deform-able solid is considered in the current configuration, which may be as the reference (undeformed) or the actual (deformed). We propose an original variational approach to the problem for stresses in selected subdomains, in which, depending on different engineering considerations, average in-tegral values of different component of stresses are estimated and from their aggregate the bearing capacity of the current configuration of the solid is estimated regarding to given external influ-ences. In each of the selected subdomain the weakest stress field is obtained which is globally bal-anced with external influences. For example, the assessment of the average integral hydrostatic pressure is needed for study of bearing capacity of geomaterials.

How to cite: Brigadnov I.A. Multicriteria estimation of bearing capacity of geomaterials // Journal of Mining Institute. 2016. Vol. 218 . p. 289-295.
Geomechanics
  • Date submitted
    2013-07-18
  • Date accepted
    2013-09-24
  • Date published
    2014-03-17

Forecast stress state of mass when extraction coal reserves under open pit mine in the underground mining Nui Beo (Vietnam)

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Define the underground extraction zone, which under the influence of open pit mine, on the tunnels in geology conditions of the underground mining Nui Beo. Calculate the components of the stress of the around rocks and tunnels under the pits and given the reasonable parameters of the support passport.

How to cite: Kuang N.V. Forecast stress state of mass when extraction coal reserves under open pit mine in the underground mining Nui Beo (Vietnam) // Journal of Mining Institute. 2014. Vol. 207 . p. 226-230.
Geomechanics
  • Date submitted
    2013-07-12
  • Date accepted
    2013-09-22
  • Date published
    2014-03-17

Method of normal load prediction on vertical shaft lining based on nonlinear behaviour of rock mass

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Method of normal load prediction on vertical shaft lining which is constructed in nonlinear rock mass is suggested. It is supposed, that limit state zone is formed around excavation. The deformation properties of rock mass in the suggested method are determined according to nonlinear rock model. In order to predict stress and strain state around excavation the equations of deformation plasticity theory are used. The Mohr-Coulomb strength criteria is taken as a yield surface.

How to cite: Protosenya A.G., Bai N.N. Method of normal load prediction on vertical shaft lining based on nonlinear behaviour of rock mass // Journal of Mining Institute. 2014. Vol. 207 . p. 231-234.
Mining machine, electrical engineering and electromechanics
  • Date submitted
    2010-07-26
  • Date accepted
    2010-09-14
  • Date published
    2011-03-21

Algorithm of control of the electric drive with ventilniy electric motor and the converter of frequency with the active rectifier

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Advantages of application of the active rectifier as a part of converters of frequency for powerful drives with ventilniy electric motors are considered. The mathematical description of the processes proceeding in a power part of the active rectifier is given. The scheme of a drive with a vector control system with the gage of position of a rotor and the active rectifier is presented, schedules of power consumption and a current by a drive with the active rectifier are resulted.

How to cite: Emelyanov A.P., Sviridenko A.O. Algorithm of control of the electric drive with ventilniy electric motor and the converter of frequency with the active rectifier // Journal of Mining Institute. 2011. Vol. 189 . p. 87-90.
Geomechanics, geodesy, mine surveying and cadastre
  • Date submitted
    2010-07-17
  • Date accepted
    2010-09-02
  • Date published
    2011-03-21

Selection of parameters camouflet blasting to reduce bump hazard by development uranium deposits

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Simulation-based by the finite element values obtained stress strain state around the stope ore as ore body downstream horizontal layers with a mined-out space. The results of the simulation allowed to substantiate a contained blasting parameters to bring pillar to anti bump hazard state.

How to cite: Dordzhiev D.Y. Selection of parameters camouflet blasting to reduce bump hazard by development uranium deposits // Journal of Mining Institute. 2011. Vol. 189 . p. 210-213.
Problems in geodynamic and ecological safety in the exploration of fields of oil and das, their storage and transporta
  • Date submitted
    2009-10-06
  • Date accepted
    2009-12-30
  • Date published
    2010-09-22

Research of deformation, strength and filtration characteristics of Nizhnechutinskoe oil field’s reservoirs in case of depression making in the process of oilwells exploitation

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It is determined that main reasons of permeability reservoirs decrease in Nizhnechutinskoe oil field are capillary pressures and elastic stresses, appearing at depression making. It is displayed that to reduce tangential stresses in oil bearing reservoirs it is expedient to make vertical slits in oilwells’ open holes.

How to cite: Petukhov A.V., Petukhov A.A. Research of deformation, strength and filtration characteristics of Nizhnechutinskoe oil field’s reservoirs in case of depression making in the process of oilwells exploitation // Journal of Mining Institute. 2010. Vol. 188 . p. 195-202.