JMS, Vol. 57, No. 5, 2021
GEOMECHANICS
MALY TULUKUI DEPOSIT IN SOUTHEASTERN TRANSBAIKALIA: GEOMECHANICS AND GEODYNAMICS
I. Yu. Rasskazov*, V. A. Petrov, Yu. V. Fedotova, P. A. Anikin, M. I. Potapchik, and V. I. Usikov
Institute of Mining, Far East Branch, Russian Academy of Sciences, Khabarovsk, 680000 Russia
*e-mail: rasskazov@igd.khv.ru
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences,
Moscow, 119017 Russia
The article presents the integrated research into geomechanics and geodynamics of the Maly Tulukui uranium ore deposit in southeastern Transbaikalia. The studies into tectonic structure and the terrain morphometry in the area of the Steltsovka ore field reveals the modern geodynamics features and their correlation with the stress–strain behavior of rock mass. The stress field parameters and the physical/mechanical properties of rocks point at potential of dynamic fracture in the edge area of the deposit. The numerical stress–strain modeling and in-situ observation data prove the tendency of rock mass to rockbursting, and the bottom levels of the deposit (at the depth of 500 m and downward) are assessed as rockburst-hazardous. A package of measures aimed to prevent rock bursts and to reduce geodynamic risk is developed for the mining safety.
Geodynamic zoning, stress–strain behavior, physical and mechanical properties, geomechanical control, rockburst hazard
DOI: 10.1134/S106273912105001X
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DILATANT PROPERTIES OF RANDOM SPHERE PACKING
A. F. Revuzhenko*, A. P. Bobryakov, and V. P. Kosykh
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
*e-mail: revuzhenko@yandex.ru
The authors describe the dilatancy testing of granular media composed on similar spherical particles—glass balls, millet grains and peas. The testing included simple shearing and complex loading with continuous rotation of the strain tensor axes. The cyclic deformation enables partial elimination of defects of the initial stochastic packing and promotes its transition to a reversible state. The optimal relative density of a packing is presented for the discrete element analyses.
Dilatancy, simple shear, complex loading, cyclic deformation, granular bodies, stochastic packing, relative density
DOI: 10.1134/S1062739121050021
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EXCITATION OF SEISMIC VIBRATIONS IN FRACTURES BY WATER FLOW AND DETERMINATION OF THE FLOW PARAMETERS USING THE SEISMIC RADIATION PATTERNS
S. V. Serdyukov and A. V. Azarov*
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
*e-mail: antonazv@mail.ru
The authors discuss the numerical and field research findings on seismic radiation of water flow in a fracture. The flow parameters can be remotely controlled using the amplitude-versus-frequency response of the vibrations recorded. It is recommended to include the infra-low frequency control in the seismic monitoring in hydrodynamically hazardous mines.
Rock mass, fracture, water flow, seismic radiation, elastic vibration amplitude and frequency, mathematical modeling, in-situ experiment
DOI: 10.1134/S1062739121050033
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DISCRETE-ELEMENT MODELING OF STRAIN LOCALIZATION IN GRANULAR MEDIUM AT PASSIVE PRESSURE APPLICATION TO. A. RETAINING WALL
S. V. Klishin
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
e-mail: sv.klishin@gmail.com
3D discrete-element modeling is used to analyze passive pressure applied by dense soil to a retaining wall. The soil particles have spherical shapes with the radii selected from the normal distribution. The calculation of tangential forces between the particles takes into account the sliding friction and rolling resistance. The surface roughness of the retaining wall has influence on localization of shear strains in the granular medium and on the pressure applied to the wall by the granular material. The calculation results are compared with the classical solution of the limit state theory.
Granular material, dense soil, retaining wall, passive pressure, shear strain localization, discrete element method
DOI: 10.1134/S1062739121050045
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ROCK FAILURE
THE DYNAMIC CAUSTICS TEST ON THE GROWTH LAW OF FRACTURES IN TUNNEL SURROUNDING UNDER EXPLOSIVE LOAD
Kang Liu*, Dongming Guo, Jun Zhang, and Xinchao Kang
China University of Mining & Technology, Beijing, 100080 China
*e-mail: liukang0512@163.com
The damage to the surrounding rock under the adjacent explosive load generally manifests as fracture growth. In order to in-depth understand the fracture growth law and mechanism, fracture growth process in the surrounding rock with a nearby adjacent tunnel under the explosive load is studied using the dynamic caustics method. Test results indicate that the original fracture growth process can be divided into two stages, demarcated when the main fracture penetrates the original fracture. The original fracture grows in the vertical direction due to the free surface of the tunnel in the first stage. The main fracture from the explosive source plays a dominant role in the growth direction of the original fracture in the second stage, and the original fracture deflects and grows parallel to the main fracture. Based on kinematic and energy analysis, the penetration process is companied by energy transfer and superposition. The neglected back-facing side also contains fracture on the lower side. The fracture growth direction changes after the original fracture penetrates the free surface of tunnel under the combined effect of the original fracture and unloading wave.
Explosive load, adjacent tunnel, original fracture, growth law, dynamic caustics
DOI: 10.1134/S1062739121050057
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CHANGES OF PROPERTIES OF CARBONIFEROUS ROCK MASS AND THE OCCURRENCE OF SOME NATURAL HAZARDS IN THE CONDITIONS OF FLOODING OF ROADWAYS WITHIN ABANDONED COAL MINES
M. Bukowska* and P. Bukowski
Central Mining Institute, Katowice, 40–166 Poland
*e-mail: mbukowska@gig.eu
The authors asses water hazard and select methods to prevent it in the areas that are saturated with water and subjected to intensive drainage in the Upper Silesian Coal Basin. The research is important in the areas adjacent to the mines that are closed owing to flooding of roadways and hence is significant for the assessment of the influence of secondary saturation of the rock mass with water on the rock mass mined in an active mine. Changes to the occurrence conditions of the geodynamic phenomena of rock bursts are discussed in the context of the processes of restructuring mines and the associated processes of water inflow and flooding closed mines. The propensity of the rock mass to rock bursts in the border areas between active and closed mines is assessed.
Rock burst propensity, geomechanical hazards, water hazards, mine closure
DOI: 10.1134/S1062739121050069
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MINERAL MINING TECHNOLOGY
VALIDATION OF FRICTION-ANCHORED ROCK BOLT SUPPORTS FOR UNDERGROUND EXCAVATIONS IN BACKFILL
Yu. N. Shaposhnik*, A. I. Konurin, A. A. Neverov, S. A. Neverov, O. M. Usol’tseva, and S. N. Shaposhnik
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
*e-mail: shaposhnikyury@mail.ru
Serikbayev East Kazakhstan Technical University, Ust-Kamenogorsk, Kazakhstan
The rational mine support system designs for underground excavations in backfill are discussed. The current mine support technology applied in excavations in backfill in Artemievsk and Orlovsky mines is examined. The strength and deformation characteristics of backfill samples are tested on a laboratory scale. The FEM-based stress–strain analysis of ore body and backfill is described with the assessment of their stability. The probable failure zones in backfill and ore body during to-downward slice mining are determined. The rational support design is validated for backfill having stability category I, II and III. The pilot test data on the load-bearing capacity of friction-anchored rock bolts in backfill are assessed. The economic efficiency of the mixed-type support composed of steel frame and friction-anchored rock bolts in backfill is demonstrated.
Underground excavation, gate entry, layer, backfill, mine support, backfill stability category, testing, strength and deformation characteristics, modeling, failure, strength, stability, friction-anchored bolts, efficiency
DOI: 10.1134/S1062739121050070
REFERENCES
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6. Tekhnologicheskii reglament proizvodstva zakladochnykh rabot na Orlovskoi shakhte Orlovskogo proizvodstvennogo kompleksa TOO Vostoktsvetmet (Backfill Production Procedures for Orlovsky Mine of Vostoktsvetmet Production LLC), 2017.
7. Rukovodstvo po opredeleniyu normativnoi prochnosti tverdeyushchei zakladki na rudnikakh tsvetnoi metallurgii (Strength Determination Guidelines for Cemented Backfill in Nonferrous Metallurgy Mines), Saint-Ptersburg: VNIMI, 1993.
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10. Tekhnologicheskii reglament po vyboru tipov i parametrov krepei i tekhnologii ikh vozvedeniya pri otrabotke Orlovskogo mestrozhdeniya TOO Vostoktsvetmet (Production Procedures for Mine Support System Selection, Design and Installation Technologies in Vostoktsvetmet’s Orlovsky Deposit Mining), 2017.
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DIFFERENTIATED ASSESSMENT OF STABILITY OF EXPOSED ROCK SURFACES IN SUBLEVEL STOPING WITH BACKFILL
V. I. Golik*, Yu. Razorenov, V. S. Puzin, and G. V. Stas’**
South Russian State Technical University, Novocherkassk, 346428 Russia
*e-mail: v.i.golik@mail.ru
Tula State University, Tula, Russia
**e-mail: galina_stats@mail.ru
Moscow Polytechnic University, Moscow,107023 Russia
The article proposes an integrated approach to safety evaluation in underground mining of rare, noble and nonferrous metals. The approach includes joint assessment of variable rock properties, zoning of mineral deposits and ranking of the integrity criterion of natural arch span. The authors validate geotechnical stability in sublevel stoping as a case-study of the Shokpak-Kamyshovoe deposit. The feasibility of mining of isolated and thin bodies without backfilling or with induced caving of enclosing rocks is determined.
Rock mass, mining systems, stability, procedure
DOI: 10.1134/S1062739121050082
REFERENCES
1. Golik, V.I., Polukhin, O.N., Petin, A.N., and Komashchenko, V.I., Environmental Problems of Working out of Ore Deposits of Kursk Magnetic Anomaly, Gornyi Zhurnal, 2013, no. 4, pp. 91–94.
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10. Seryakov, V.M., Mathematical Modeling of Stress–Strain State in Rock Mass during Mining with Backfill, Journal of Mining Science, 2014, vol. 50, no. 5, pp. 847–854.
11. Razorenov, Yu.I., Golik, I.I., and Kulikov, M.M., Ekonomika i menedzhement gornoi promyshlennosti (Economy and Management in the Mining Industry), Novocherkassk, 2010.
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THE BAKCHAR IRONSTONE DEPOSIT: MINING CONDITIONS AND TECHNOLOGIES
V. I. Cheskidov*, V. L. Gavrilov**, A. V. Reznik, and A. S. Bobyl’sky
Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences,
Novosibirsk, 630091 Russia
*e-mail: cheskid@misdl.ru
**e-mail: gvlugorsk@mail.ru
Depletion of available mineral resources in the metallurgy industry, as well as the growing internal and external demand for the high-quality iron products necessitates development of new iron ore fields in Siberia. This article offers description of climate, geology and hydrology in the area of the Bakchar oolitic ironstone deposit in the Tomsk Region as a promising subsoil use object. The literature and engineering solutions on this matter are reviewed. The mining risks in the conditions of high environmental standards and market uncertainty are described. The basic requirements are formulated for the potential geotechnologies, and the conceptual framework is proposed for the environmentally sound and resource-saving mining with smart usage of natural and manmade resources in the iron ore production cycle.
Deposit, ironstone, geological conditions, water-cut, open pit mine water, productive strata, mining technology, hydromechanization, mined-out void
DOI: 10.1134/S1062739121050094
REFERENCES
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A MULTILEVEL APPROACH TO PITWALL STABILITY MONITORING
V. V. Rybin, K. N. Konstantinov*, and I. Yu. Rozanov
Mining Institute, Kola Science Center, Apatity, 184209 Russia
*e-mail: k.konstantinov@ksc.ru
Safety of open pit mining in complicated geological conditions can be improved using the multilevel geomechanical monitoring of pitwall and adjacent rock mass. The domestic and foreign practices of pitwall stability monitoring are reviewed. The proposed approach need the operating mines to be equipped with advanced control equipment, procedures and services in order to jointly expand essentially the geomechanical monitoring possibilities.
Monitoring, multilevel approach, pitwall stability, geodesy, radar-based technologies, geophysical surveys, stress–state behavior, Poisson’s ratio
DOI: 10.1134/S1062739121050100
REFERENCES
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SCIENCE OF MINING MACHINES
CONICAL PICK FAILURE EFFECT ON ROCK CUTTING PROCESS CONDITIONS
E. A. Averin*, A. B. Zhabin**, A. V. Polyakov***, Yu. N. Linnik****, and V. Yu. Linnik*****
Skuratovsky Experimental Plant, Komsomolsky Settlement, Tula Region, 300911 Russia
*e-mail: evgeniy.averin.90@mail.ru
Tula State University, Tula, 300012 Russia
**e-mail: zhabin.tula@mail.ru
***e-mail: polyakoff-an@mail.ru
The State University of Management, Moscow, 109542 Russia
****e-mail: yun_linnik@guu.ru
*****e-mail: d0c3n7@gmail.com
The recommendations are given for conical pick patterns to prevent growing forces on neighbor picks of a failed pick. It is proposed to detect promptly pick failures by analyzing the burden variation in the transmission system of the cutting head. According to the theoretical calculations, when a pick fails, the relative growth of the feed force is not higher than the relative growth of the cutting force as against the increase in the burden as a consequence of change in the cut rock strength. This hypothesis was tested and proved during shafting at Talitsky site of the Upper Kama Potash–Magnesium Ore Deposit using shaft cutting machine 1SPKV-8.0.
Conical pick, wear, failure, rock cutting, crash conditions, cutting force/feed force ratio
DOI: 10.1134/S1062739121050112
REFERENCES
1. Prokopenko, S.A., Ludzish, V.S., and Kurzina, I.A., Improvement of Cutting Tools to Enhance Performance of Heading Machines in Rocks, Journal of Mining Science, 2016, vol. 52. no. 1, pp. 153–159.
2. Krestovozdvizhensky, P.D., Klishin, V.I., Nikitenko, S.M., and Gerike, P.B., Selecting Shape of Reinforcement Insertions for Tangential Swivel Cutters of Mining Machines, Journal of Mining Science, 2015, vol. 51, pp. 323–329.
3. Mattis, A.R., Labutin, V.N., and Cheskidov, V.I., Active Rotor for a Surface Miner, Journal of Mining Science, 2008, vol. 44, no. 2, pp. 198–205.
4. Dewangan, S. and Chattopadhyaya, S., Performance Analysis of Two Different Conical Picks Used in Linear Cutting Operation of Coal, Arabian J. Sci. Eng., 2016, vol. 41, no. 1, pp. 249–265.
5. Linnik, Yu.N., Zhabin, À.B., Linnik, V.Yu., and Polyakov, À.V., Evaluation of the Effect of Pick and Holder Failure on Performance Parameters of Coal Mining Machines, Izv. TulGU. Nauki o Zemle, 2018, no. 2, pp. 247–263.
6. Talerov, Ì.P. and Bolobov, V.I., Durability and Failure Types of Conical Picks, Gornyi Zhurnal, 2018, no. 4, pp. 77–81.
7. Klishin, V.I., Gerike, B.L., Nikitenko, S.M., and Krestovozdvizhensky, P.D., Types and Causes of Conical Pick Failures, Gornyi Zhurnal, 2016, no. 7, pp. 92–95.
8. Dewangan, S. and Chattopadhyaya, S., Characterization of Wear Mechanisms in Distorted Conical Picks after Coal Cutting, Rock Mech. Rock Eng., 2016, vol. 49, no. 1, pp. 225–242.
9. Krauze, K., Skowronek, T., and Mucha, K., Influence of the Hard-Faced Layer Welded on Tangential-Rotary Pick Operational Part on to its Wear Rate, Arch. Min. Sci., 2016, vol. 61, no. 4, pp. 779–792.
10. Yang, D., Jianping, L., Zheng, K., and Jiang, H., High-Hardness Alloy Substituted by Low Hardness during Drilling and Cutting Experiments of Conical Pick, Int. J. Rock Mech. Min. Sci., 2017, no. 95, pp. 73–78.
11. Klishin V. I., Nikitenko S. M., Gerike B. L., and Krestovozdvizhensky, P.D., New Reinforcing Inserts for Conical Picks, Gornyi Zhurnal, 2014, no. 12, pp. 89–92.
12. Liu, S., Ji, H., Liu, X., and Jiang, H., Experimental Research on Wear of Conical Pick Interacting with Coal-Rock, Eng. Failure Analysis, 2017, vol. 74, pp. 172–187.
13. Yang, D., Li, J., Wang, L., Kuidong, G., Tang, Y., and Wang, Y., Experimental and Theoretical Design for Decreasing Wear in Conical Picks in Rotation-Drilling Cutting Process, Int. J. Advanced Manufacturing Techn., 2015, vol. 77, nos. 9–12, pp. 1571–1579.
14. Zhabin, A.B., Polyakov, A.V., and Averin, E.A., On the Necessity to Introduce a State Standard for Determining the Abrasiveness of Rocks, Ugol’, 2018, no. 11, pp. 86–91.
15. Talerov, M.P., Bolobov, V.I., and Chupin, S.A., Procedure for Calculating Durability and Determining the Cause of Conical Pick Failure, Gornoe oborudovanie i elektromekhanika, 2014, no. 1, pp. 16–23.
16. Dogruoz, C., Bolukbasi, N., Rostami, J., and Acar, C., An Experimental Study of Cutting Performances of Worn Picks, Rock Mech. Rock Eng., 2016, vol. 49, no. 1, pp. 213–224.
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18. Zhabin, A.B., Polyakov, A.V., Averin, E.A., Linnik, Yu.N., and Linnik, V.Yu., Taking into Account Non-Optimal Modes of Rock Cutting with Conical Picks, Ugol’, 2019, no. 7, pp. 20–24.
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21. Lukin, D.G., Yungmeister, D.À., Yacheikin, À.I., and Isaev, À.I., Improvement of the Operation of Tunneler KT 1–5.6M Cutting Head, Gornyi Zhurnal, 2018, no. 12, pp. 73–76.
MINERAL DRESSING
STIMULATING MODIFICATION OF SPECTRAL AND KINETIC CHARACTERISTICS OF DIAMONDS BY HYDROPHOBIZATION OF LUMINOPHORES
V. V. Morozov, V. A. Chanturia, G. P. Dvoichenkova*, and E. L. Chanturia
Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources—IPKON, Russian Academy of Sciences, Moscow, 111020 Russia
*e-mail: dvoigp@mail.ru
The integrated thermodynamic calculations and spectral analyses validated concentrations of hydrophobization agents (butyl xanthate and sodium oleate) to ensure chemisorption and chemical interaction with silicate matrix of luminophore FL-530. It is found that in the optimized conditions, hydrophobization agents interact with zinc orthosilicate without volume reaction which degrades spectral characteristics of luminophore. The increased oil receptivity of luminophore FL-530 improves its ability to remain in the organic phase of emulsion and to better attach to the surface of diamonds. The UV visiometrics revealed better attachment of hydrophobic luminophore at diamonds. The optimal concentrations of solutions of butyl xanthate and sodium oleate are determined. The tests using separator Polyus-M proved efficiency of hydrophobic luminophore FL-530 which essentially enlarged amplitudes of the fast and slow signal components in X-ray fluorescence of slight fluorescent diamond and their recovery in separation.
Diamonds, X-ray fluorescent separation, luminophores, composition, kinetics and spectral characteristics, modification
DOI: 10.1134/S1062739121050124
REFERENCES
1. Chanturia, V.A., Dvoichenkova, G.P., Morozov, V.V., Yakovlev, V.N., Koval’chuk, Î.Å., and Podkamennyi, Yu.A., Experimental Substantiation of Luminophore-Containing Compositions for Extraction of Nonluminescent Diamonds, Journal of Mining Science, 2019, vol. 55, no. 1, pp. 116–123.
2. Chanturia, V.A., Dvoichenkova, G.P., Morozov, V.V., Koval’chuk, Î.Å., Podkamennyi, Yu.A., and Yakovlev, V.N., Selective Attachment of Luminophore-Bearing Emulsion at Diamonds—Mechanism Analysis and Mode Selection, Journal of Mining Science, 2020, vol. 56, no. 1, pp. 96–103.
3. Koval’chuk, Î.Å., Dvoichenkova, G.P., and Yakovlev, V.N., Increasing the Recovery of Anomalous Fluorescent Diamonds by Modifying Their Surface Properties, Problems and Prospects of Effective Mineral Processing in XXI Century (Plaksin’s Lectures—2019), Moscow, 2019.
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21. Park, J., Park, K., Lee, S., Kim, J., Kim, G., and Yoo, J., A Simple Synthesis Method for Zn2SiO4:Mn2+ Phosphor Films and their Optical and Luminescence Properties, J. Lumin., 2013, vol. 134, pp. 71–74.
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25. Yakovleva, À.À., Chyong, S.N., Pridatchenko, Yu.V., and Shuvaeva, Å.Ì., On the Problem of Critical Concentration of Micelle Formation of Sodium Oleate, Izv. Vuzov, Prikl. khimiya i biotekhnol., 2013, no. 1, pp. 105–111.
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MIXED-TYPE FLOTATION–HYDROMETALLURGICAL PROCESSING TECHNOLOGY FOR COMPLEX COPPER-BEARING ORE
O. E. Gorlova, N. L. Medyanik*, O. A. Mishurina, and E. R. Mullina
Nosov Magnitogorsk State Technical University, Magnitogorsk, 455000 Russia
*e-mail: medyanikmagnitka@mail.ru
The article describes the studies into sulphide extraction from ore using an integration of flotation and oxidized copper leaching in the conditions of milling with nonacid complexing agent—ammonium sulfate, and adsorption–electrolytic recovery of copper from pregnant highly mineralized copper-bearing solutions. The thermodynamic function of products of interaction between the base copper minerals and the yield of the hydrolysis ammonium sulfate solutions is presented. The mechanism of sulfate ammonium leaching of oxidized copper minerals in joint mechanical–thermal activation treatment is proposed. The tests on treatment of low-grade complex copper-bearing ore from stockpiles by combination of chemical and electrochemical methods and on the mixed-type flotation–hydrometallurgical processing technology of complex copper-bearing ore were carried out.
Complex copper-bearing ore, mixed-type technology, flotation, leaching, ammonium sulfate, process parameters
DOI: 10.1134/S1062739121050136
REFERENCES
1. Khalezov, B.D., Heap Leaching of Copper and Copper-Zinc Ores (Domestic Experience), Yekaterinburg: UrO RAN, 2013.
2. Ukraintsev, I.V., Trubilov, V.S., and Klepikov, À.S., Lean, Low-Grade and Technogenic Raw Materials as a Promising Source of Copper Production, Tsvet. Metally, 2016, no. 10, pp. 36–42.
3. Medyanik, N.L., Mishurina, Î.À., Mullina, E.R., Smirnova, À.V., and Zaitseva, Å.V., Technology for Comprehensive Processing of Hydrotechnogenic Formations of Ñopper Pyrite Mining Enterprises, Vestn. MGTU. G. I. Nosova, 2019, vol. 17, no. 4, pp. 10–17.
4. Chanturia, V.A., Shadrunova, I.V., Medyanik, N.L., and Mishurina, O.A., Electric Flotation Extraction of Manganese from Hydromineral Wastes at Yellow Copper Deposits in the South Ural, Journal of Mining Science, 2010, vol. 46, no. 3, pp. 311–316.
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6. Gorlova, Î.Å., Yun, À.B., Sinyanskaya, Î.Ì., and Medyanik, N.L., Development and Pilot Testing of a Mixed-Type Processing Technology for a Stockpile of Rebellious Complex Copper-Bearing Ores from the Taskora Deposit, Tsvet. Metally, 2018, no. 12, pp. 14–20.
7. Abramov, À.À., Collected Works. Vol. 7. Flotation. Collecting Agents, Moscow: Gornaya kniga, 2018.
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11. Baba, A.A., Ghosh, M.K., Pradhan, S.R., Rao, D.S., Baral, A., and Adekola, F.A., Characterization and Kinetic Study on Ammonia Leaching of Complex Copper Ore, Trans. Nonferrous Metals Society of China, 2014, vol. 24, pp. 1587–1595.
12. Gorlova, Î.Å., Development of Scientific and Methodological Foundations of Mining Waste Processing Technology, Doctor of Tech. Sci. Thesis, Magnitogorsk, 2020.
MINE AEROGASDYNAMICS
TEMPERATURE AND HUMIDITY DEPENDENT MRAS BASED SPEED ESTIMATION TECHNIQUE FOR INDUCTION MOTOR USED IN MINE VENTILATION DRIVE
Prince and Ananda Shankar Hati*
Department of Mining Machinery Engineering, Indian Institute of Technology (Indian School of Mines),
Dhanbad, 826004 India,
*e-mail: anandashati@iitism.ac.in
This paper aims to encapsulate the trends in the variation of speed with real-time parameters, i.e., temperature and the corresponding change in humidity thereof for the underground mine ventilation system. The purpose mentioned above is fulfilled using a precise and vigorous estimation method of the speed for the sensorless induction motor drive (IMD). The developed model reference adaptive scheme (MRAS) speed estimator can be utilized to control the IM speed for the underground mine ventilation system based on the real-time parameters. The present work is on temperature and humidity-dependent MRAS based sensorless speed estimation technique for IM used in mine ventilation drives. This methodology has been tested analytically and experimentally using MATLAB/Simulink and LabVIEW-2013 laboratory interfaces. Furthermore, a statistically validated empirical relation between the temperature, humidity of the underground mine and speed of the ventilation system has also been developed to facilitate calculations of the same. However, implementing the proposed methodology in an actual underground mine remains a thing of the future.
Speed estimation, MRAS, induction motor drive, ventilation system
DOI: 10.1134/S1062739121050148
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30. Acuna, E.I. and Feliu, A., Considering Ventilation on Demand for the Developments of the New Level Mine Project, El Teniente, Proc. 7th Int. Conf. Deep High Stress Min., Australian Centre for Geomechanics, 2014.
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MINING THERMOPHYSICS
MODELING AIR FLOW–LINING HEAT TRANSFER IN THE CONDITIONS OF MIXED CONVECTION IN. A. MINE SHAFT
E. V. Kolesov*, B. P. Kazakov, and M. A. Semin
Mining Institute, Ural Branch, Russian Academy of Sciences, Perm, 614007 Russia
*e-mail: kolesovev@gmail.com
The air flow dynamics in a vertical mine shaft under conditions of mixed convection is theoretically studied using 3D modeling in ANSYS. The average heat-transfer coefficients are obtained at the air–lining interface depending on air–lining temperature difference and on the average air flow velocity. The threshold velocities of air flow are determined at various air–lining temperature differences. At the air flow velocities higher than the threshold, the engineering designs can neglect the influence of the heat–gravitational forces and use the formula of heat transfer in induced convection. When the air velocity is lower than the threshold, the heat-transfer coefficient should be adjusted with respects to the natural convection effect. The authors offer an empirical formula for calculating the average dimensionless heat transfer coefficient in case of prevailing natural convection.
Mine ventilation, mine shaft, mixed convection, heat-transfer coefficient, CFD modeling, heat transfer
DOI: 10.1134/S106273912105015X
REFERENCES
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7. Kozdoba, L.À. and Chernyak, V.P., Physical Characteristics and Mathematical Description of the Rock Mass-Production System in Connection with the Problem of Predicting and Adjusting the Thermal Regime of Deep and Metalliferous Mines, Proc. of Int. Symp. Gradient-77, Kiev: Naukova dumka, 1977.
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11. Chernyak, V.P., Teplovye raschety podzemnykh sooruzhenii (Thermal Calculations of Underground Structures), Kiev: Naukova dumka, 1993.
12. Kozdoba, L.À. and Chernyak, V.P., Physical Characteristics and Mathematical Description of the Rock Mass-Production System in Connection with the Problem of Predicting and Adjusting the Thermal Regime of Deep and Metalliferous Mines, Proc. of Int. Symp. Gradient-77, Kiev: Naukova dumka, 1977.
13. Shcherban’, A.N. and Kremnev, Î.À., Nauchnye osnovy rascheta i regulirovaniya teplovogo rezhima glubokikh shakht: v 2 t. (Scientific Basis for Calculating and Adjusting the Thermal Regime of Deep Mines: in Two Volumes. Volume I), Kiev: AN USSR, 1959.
14. Kremnev, Î.À. and Zhuravlenko, V.Ya., Teplo- i massoobmen v gornom massive i podzemnykh sooruzheniyakh (Heat and Mass Transfer in the Rock Mass and Underground Structures), Kiev: Naukova dumka, 1986.
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vol. 8, no. 1, pp. 19–22.
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PSYCHROMETRIC ANALYSIS OF. A. FULLY MECHANIZED UNDERGROUND COAL MINE AND ESTABLISHMENT OF ACCEPTABLE CLIMATE CONDITIONS
M. Onder*, N. Kursunoglu, and S. Onder
Eskisehir Osmangazi University, Eskisehir, 26480 Turkey
*e-mail: monder@ogu.edu.tr
Batman University, Batman, 72100 Turkey
Hot and humid mine atmosphere can produce a strain on the human body. The study of water vapor in air is known as psychrometry and psychrometric properties of mine air allows to calculate the heat and moisture content. The psychrometric conditions of mine air have a great effect on the health, safety and productivity of employees. When considering the climatic conditions of a mine, the high temperature and humidity problem must be considered. Thus, it is possible to find out the heat and moisture content of air by making psychrometric calculations. In this study, measurement studies have been carried out to determine the increase of heat and humidity in a coal mine using mechanized production method in Turkey and then, heat and moisture exchanges in mine air were calculated. At the end of the study, according to EN ISO 7243: 2017, the amount of required air flow to provide the acceptable climatic conditions was calculated.
Psychrometry, mine air, humidity, heat
DOI: 10.1134/S1062739121050161
REFERENCES
1. Roghanci, P., Kocsis, K.C., and Sunkpal, M., Sensitivity Analysis of the Effect of Airflow Velocity on the Thermal Comfort in Underground Mines, J. Sustainable Min., 2016, vol. 15, no. 4, pp. 175–180.
2. Guyaguler, T., High Temperature and Humudity Problem in Underground Coal Mining, The Sixth Coal Congress of Turkey, Zonguldak, 1988.
3. Xiaojie, Y., Qiaoyun, H., Jiewen, P., Xiaowei, S., Dinggui, H., and Chao, L., Progress of Heat-Hazard Treatment in Deep Mines, Min. Sci. Technol., Xuzhou, China, 2011, vol. 21, no. 2, pp. 295–299.
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8. Maurya, T., Karena, K., Vardhan, H., Aruna, M., and Raj, M.G., Potential Sources of Heat in Underground Mines—a Review, Procedia Earth Planet. Sci., 2015, vol. 11, pp. 463–468.
9. Sunkpal, M., Roghanchi, P., and Kocsis, K.C., A Method to Protect Mine Workers in Hot and Humid Environments, Safety Health Work, 2018, vol. 9, no. 2, pp. 149–158.
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12. Krasyuk, A.M., Lugin, I.V., Kosykh, P.V., and Russky, E.Yu., Substantiation of Life Extension Method for Two-Stage Axial Flow Fans for Main Ventilation, J. Min. Sci., 2019, vol. 55, no. 3, pp. 478–493.
13. Kiyanitsa, L.A., On the Calculation of Air Flow Rates to Ventilate Closed-Type Stations in Subway with the Double-Track Tunnel, IOP Conf. Series Earth and Env. Sci., 2018, vol. 134. — Article ID 012027.
14. Levin, L.Yu., Semin, M.A., and Zaitsev, A.V., Mathematical Methods of Forecasting Microclimate Conditions in an Arbitrary Layout Network of Underground Excavations, J. Min. Sci., 2014, vol. 50, no. 2, pp. 371–378.
15. Khanal, M., McPhee, R., Belle, B., Brisbane, P., and Kathage, B., Preliminary Investigation on Using IS Approved Real Time Dry Bulb and Relative Humidity Sensors in Underground Coalmines, J. Min. Sci., 2019, vol. 55, no. 1, pp. 169–174.
16. Li, X. and Fu, H., Development of an Efficient Cooling Strategy in the Heading Face of Underground Mines, Energies, 2020, vol. 13, no. 5. — Article ID 1116.
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19. Onder, M., Climatic Condition Simulation of Underground Mines, Osmangazi University, 2001.
20. EN ISO 7243:2017. Ergonomics of the Thermal Environment—Assessment of Heat Stress Using the WBGT (Wet Bulb Globe Temperature) Index, 2017.
21. Howes, M.J. and Nixon, C.A., Development of Procedures for Safe Working in Hot Conditions, Proc. of the 6th Int. Mine Ventilation Congress, Soc. for Min., Metal. and Explorat., 1997.
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GEOINFORMATION SCIENCE
IDENTIFICATION OF STRUCTURALLY ALTERED COAL FROM NEAR-FAULT ZONES AS PERFORMED WITH NEURAL CLASSIFIERS
M. Skiba*, K. Godyn, and M. Mlynarczuk
Strata Mechanics Research Institute of the Polish Academy of Sciences, Krakow, 30–059 Poland
*e-mail: skiba@img-pan.krakow.pl
The aim of the research is to propose that artificial neural networks be applied in the process of identification of structurally altered coal. The results suggest that the proposed methodology of classification, due to its high effectiveness exceeding 90% of correct identifications, may be successfully used as a tool supporting the observer’s decisions concerning the description of coal from near-fault zones.
Structurally altered coal, artificial neural networks (ANN), quantitative analysis of coal, near-fault zone
DOI: 10.1134/S1062739121050173
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