Nauki Techniczne

Archives of Mining Sciences

Zawartość

Archives of Mining Sciences | 2021 | vol. 66 | No 1 |

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Abstrakt

The authors of the paper describe the way in which the longitudinal working Gussmann was mined in level V and the longitudinal working Kosocice in level VI, which in both cases resulted in a water flux from behind the northern boundary of the salt deposit. Only after concrete dams were seated on both levels, the brine flux was stopped leaving a direct contact of the dams with the pressurized water around the mine. For the sake of controlling water beyond the dams, steel pipelines were conducted through both dams and equipped with gauges before the dams. Their use in a saline environment, the developing corrosion increased the possibility that the tightness of the pipelines would be damaged. For this reason a decision was made to protect the mine by making a tight reconstruction of the safety pillar in both levels along the longitudinal working for about 600 m from the dams eastwards. For this purpose the pipeline injection method was applied. As the volume of voids to be tightly filled equaled to about 3800 m3, the task had to be divided into stages. Because of considerable distances of the liquidated workings from the closest shaft, the sealing slurries were prepared in a special injection center on the surface from where they were transported to the destination with a pumping pipeline through the Kościuszko shaft. The most important aspect of liquidating the end parts of the longitudinal working was to properly select the sealing slurries in view of their best cooperation with the rock mass, and such parameters as tightness, durability and cost. At the end stage of works, both longitudinal workings were equipped with dams, which were sealed up with the hole injection method. The innovative technology was implemented in the Wieliczka Salt Mine to reconstruct the safety pillar in levels VI and V in the most westward workings, the mine was shortened by about 600 m, the length of the ventilation system was reduced, systematic observations and pressure read-outs in dams 3 and 4 were systematically eliminated in dams 3 and 4. In this way the costs were lowered and safety of the mine improved.
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Bibliografia

1] M. Cała, A. Stopkowicz, M. Kowalski, M. Blajer, K. Cyran, K. d’Obyrn, Stability analysis of underground mining openings with complex geometry. Studia Geotechnica et Mechanica 38, 1, 25-32 (2016).
[2] K . d’Obyrn, K. Brudnik, Results of hydrogeological monitoring in ‘Wieliczka’ Salt Mine after closing water inflow in transverse working Mina, level IV (Wyniki monitoringu hydrogeologicznego w Kopalni Soli „Wieliczka” po zamknięciu dopływu wody w poprzeczni Mina na poz. IV). Mining Review (Przegląd Górniczy) 6, 90-96 (2011).
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[4] D . Flisiak, K. Cyran, Geomechanical parameters of miocene rock salt (Właściwości geomechaniczne mioceńskich soli kamiennych). Geological Bulletin of the Polish Geological Institute (Biuletyn Państwowego Instytutu Geologicznego) 429, 43-49 (2008).
[5] A . Garlicki, A. Gonet, S. Stryczek, Reinforcement of saline rock mass on the example of the salt mine Wieliczka. Proc. of the 2001 ISRM Intern. Symposium Frontiers of Rock Mechanics and Sustainable Development in the 21st Centry Beijing, China., A.A. Balkema Publishers, 581-583 (2001).
[6] A . Garlicki, Z. Wilk, Geological and hydrogeological background of water breakdown at level IV in ‘Wieliczka’ Salt Mine (Geologiczne i hydrogeologiczne tło awarii wodnej na poziomie IV kopalni soli Wieliczka). Geological Review (Przegląd Geologiczny) 41, 3, 183-192 (1993).
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[10] S. Stryczek, A. Gonet, Selection of slurries for reinforcing saline rock mass (Dobór zaczynów do wzmacniania górotworu solnego). Conference proceedings ‘Restoring usability value to mining areas. Old mines – new perspectives’ (Materiały konferencyjne pt. Przywracanie wartości użytkowych terenom górniczym. Stare kopalnie – nowe perspektywy), PAN -IGSMiE, Kraków, 327-335 (2001).
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Autorzy i Afiliacje

Andrzej Gonet
1
ORCID: ORCID
Stanisław Antoni Stryczek
1
ORCID: ORCID

  1. AGH University of Science and Technology, Faculty of Drilling, Oil and Gas, Al. A. Mickiewicza 30, 30-059 Krakow, Poland
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Abstrakt

This paper provides an analysis of the evacuation process in a road tunnel in the event of a fire, using the example of the tunnel under the Luboń Mały mountain currently being constructed on Expressway S7’s Lubień – Rabka-Zdrój section. As fires are the largest and most dangerous events occurring in road tunnels, it is important to predict the evacuation process as early as at the design stage. The study described here used numerical modelling to simulate evacuation, which made it possible to determine the required safe evacuation time of all tunnel users in a fire. On the basis of the parameters of the tunnel under Luboń Mały, numerical studies were performed for four different fire scenarios, three of which assumed various fire locations with the currently designed two traffic lanes. The fourth variant accounted for the planned extension of the roadway to include three traffic lanes. Eventually, four numerical models were developed involving various fire ignition locations and numbers of potential tunnel users. The values of initial-boundary conditions used in the simulation, such as movement speed during evacuation, shoulder breadth and pre-movement time, were specified on the basis of experimental data for an evacuation performed in smoke conditions in the Emilia tunnel in Laliki. The results lead to the conclusion that if the time of reaching critical conditions in the tunnel is not shorter than 5 minutes 40 seconds for the current design state and 5 minutes 47 seconds for three lanes, the distribution of evacuation exits in the tunnel under Luboń Mały will ensure safe evacuation.
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Bibliografia

[1] C . Caliendo, M.L. De Guglielmo, Accident rates in road tunnel and social costs evaluation. SIIV – 5th International Congress – Sustainability of Road tunnels Infrastructures. In Procedia – Social and Behavioural Sciences 53, 166- 177 (2012).
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[6] E . Ronchi, M. Kinsey, Evacuation models of the future: insights from an online survey of user’s experiences and needs. Advanced Research Workshop – Evacuation and Human Behaviour in Emergency Situations 145-155 (2011).
[7] N. Schmidt-Polończyk. Ocena możliwości stosowania wentylacji wzdłużnej w długich tunelach drogowych. Assessment of the possibility to apply longitudinal ventilation in long road tunnels. PhD thesis, AGH UST (2016).
[8] Road Tunnels: Operational Strategies for Emergency Ventilation. France: PIARC Committee on Road Tunnels (2011).
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[10] E . Ronchi, K. Fridolf, H. Frantzich, D. Nilsson, A.L. Walter, H. Modig, A tunnel evacuation experiment on movement speed and exit choice in smoke. Fire Safety Journal 97, 126-136 (2018). doi: 10.1016/j.firesaf.2017.06.002
[11] M . Seike, N. Kawabata, M. Hasegawa, Evacuation speed in full-scale darkened tunnel filled with smoke. Fire Safety Journal 91, 901-907, (2017). doi: 10.1016/j.firesaf.2017.04.034
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Autorzy i Afiliacje

Natalia Schmidt-Polończyk
1
ORCID: ORCID
Zbigniew Burtan
1
ORCID: ORCID
Piotr Liszka
1

  1. AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Krakow, Poland
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Abstrakt

The mutual influence of fatigue processes, abrasive wear and corrosion of chain links on the functional properties of mining round link chains has been presented in this paper. Selected results of experimental investigations in the field of synergic impact of these destructive processes on the operational durability of mining chains have also been presented. The emphasis was given to the necessity of a comprehensive consideration of destructive processes that occur in various conditions of use of round link chains applied in mining machines.
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Bibliografia

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[3] S. Mikuła, Trwałość zmęczeniowa cięgien łańcuchowych górniczych maszyn urabiających i transportowych. Prace Badawcze CMG Komag, Gliwice (1978).
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[10] M. Dolipski , E. Remiorz, P. Sobota, J. Osadnik, Komputerowe badania wpływu zużycia den gniazd i flanki zębów bębna na położenie ogniw w gniazdach bębna łańcuchowego. Mechanizacja i Automatyzacja Górnictwa 49 (4), (2011).
[11] M. Dolipski, E. Remiorz, P. Sobota, Determination of dynamic loads of sprocket drum teeth and seats using mathematical model of a scraper conveyor. Arch. Min. Sci. 57 (4), (2012).
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[13] A .N. Wieczorek, Influence of Shot Peening on Abrasion Wear in Real Conditions of Ni-Cu-Ausferritic Ductile Iron. Arch Metall. Mater. 61 (4), (2016).
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Autorzy i Afiliacje

Eryk Remiorz
1
ORCID: ORCID
Stanisław Mikuła
1
ORCID: ORCID

  1. Silesian University of Technology, Faculty of Mining, Safety Engineering and Industrial Automation, Department of Mining Mechanization and Robotisation, 2 Akademicka Str., 44-100 Gliwice, Poland
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Abstrakt

As the duration of a rock burst is very short and the roadway is seriously damaged after the disaster, it is difficult to observe its characteristics. In order to obtain the dynamic characteristics of a rock burst, a modified uniaxial compression experiment, combined with a high-speed camera system is carried out and the process of a rock burst caused by a static load is simulated. Some significant results are obtained: 1) The velocity of ejected particles is between 2 m/s and 4 m/s. 2) The ratio of elastic energy to plastic energy is about five. 3) The duration from integrity to failure is between 20 ms and 40 ms. Furthermore, by analyzing the stress field in the sample with a numerical method and crack propagation model, the following conclusions can be made: 1) The kinetic energy of the ejected particles comes from the elastic energy released by itself. 2) The ratio of kinetic energy to elastic energy is between 6% and 15%. This can help understand the source and transfer of energy in a rock burst quantitatively.
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Bibliografia

[1] F. Ren, C. Zhu, M. He, Moment Tensor Analysis of Acoustic Emissions for Cracking Mechanisms During Schist Strain Burst. Rock Mech. Rock Eng. 53, 1-2(2019). DOI: 10.1007/s00603-019-01897-3
[2] G . Su Y. Shi, X. Feng, J. Jiang, J. Zhang, Q. Jiang, True-Triaxial Experimental Study of the Evolutionary Features of the Acoustic Emissions and Sounds of Rockburst Processes. Rock Mech. Rock Eng. 51, 375-389 (2018). DOI: 10.1007/ s00603-017-1344-6
[3] F. Gong, Y. Luo, X. Li, X. Si, M. Tao, Experimental simulation investigation on rockburst induced by spalling failure in deep circular tunnels. Tunn. Undergr. Sp. Tech. 81, 413-427(2018). DOI: 10.1016/j.tust.2018.07.035
[4] S.H. Cho, Y. Ogata, K. Kaneko, A method for estimating the strength properties of a granitic rock subjected to dynamic loading. Int. J. Rock Mech. Min. 42 (4), 561-568(2005). DOI: 10.1016/j.ijrmms.2005.01.004
[5] J. Wang, H.D. Park, Comprehensive prediction of rockburst based on analysis of strain energy in rocks. Tunn. Undergr. Sp. Tech. 16 (1), 49-57(2001). DOI: 10.1016/S0886-7798(01)00030-X
[6] M.N. Bagde, V. Petorš, Fatigue properties of intact sandstone samples subjected to dynamic uniaxial cyclical loading. Int. J. Rock Mech. Min. Sci. 42 (2), 237-250(2005). DOI: 10.1016/j.ijrmms.2004.08.008
[7] M. Cai, H. Morioka, P.K. Kaiser, Y. Tasaka, H. Kurose, M. Minami, T. Maejima, Back-analysis of rock mass strength parameters using AE monitoring data. Int. J. Rock Mech. Min. 44 (4), 538-549(2007). DOI: 10.1016/j.ijrmms.2006.09.012
[8] K. Du, M. Tao, X. Li, J. Zhou, Experimental Study of Slabbing and Rockburst Induced by True-Triaxial Unloading and Local Dynamic Disturbance. Rock Mech. Rock Eng. 49 (9), 3437-3453(2016). DOI: 10.1007/s00603-016-0990-4
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Autorzy i Afiliacje

Weiyu Zheng
1 2

  1. China University of Mining & Technology (Beijing), School of Energy and Mining Engineering, China
  2. State Key Laboratory of Coal Mining and Clean Utilization, China
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Abstrakt

In order for the ultimate state methods to be applied in dimensioning of the load-bearing elements in a conveyance, it is required that their design loads during their normal duty cycle and under the emergency braking conditions should be first established. Recently, efforts have been made to determine the interaction forces between the shaft steelwork and the conveyance under the normal operating condition [1,2]. Thus far, this aspect has been mostly neglected in design engineering. Measurement results summarised in this paper and confronted with the theoretical data [3] indicate that the major determinant of fatigue endurance of conveyances is the force acting horizontally and associated with the conveyance being hoisted in relation to the vertical force due to the weight of the conveyance and payload.
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Bibliografia

[1] F . Matachowski, PhD thesis, Opracowanie kryteriów projektowania wybranych elementów nośnych naczynia wydobywczego. AGH University of Science and Technology, Kraków, Poland (2011).
[2] S. Wolny, F. Matachowski, Operating Loads of the Shaft Steelwork – Conveyance System dne to Ranchon Irregularities of the Guiding Strings. Arch. Min. Sci. 55 (3), 589-603 (2010).
[3] S. Wolny, Wybrane problemy wytrzymałościowe w eksploatacji górniczych urządzeń wyciągowych. Monografia. Problemy Inżynierii Mechanicznej i Robotyki, AGH, Nr 20, Kraków (2003).
[4] M. Płachno, Metoda dynamiczna badań stanu zmienności naprężeń w cięgnach naczyń wyciągowych powodowanego nierównościami torów prowadzenia. In monograph: Transport szybowy 2007, Wydawnictwo KO MAG, Gliwice, II , 51-60 (2007).
[5] M. Płachno, Mathematical model of transverse vibrations of a high-capacity mining skip due misalignment of the guiding tracks in the hoisting shaft. Arch. Min. Sci. 63 (1), 3-26 (2018).
[6] D . Fuchs, H. Noeller, Untersuchungen an Haupttraggliedern hochbeanspruchter Fördermittel. Sonderabdruck aus Glückauf 124 (9), 512-514 (1998).
[7] M. Płachno, Z. Rosner, Możliwości wczesnego wykrywania procesów zmęczeniowych w cięgnach naczyń wyciągów górniczych. Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie, Wydanie Specjalne, 241-246 (1997).
[8] S. Wolny, Interactions in mechanical systems due to random inputs on the example of a mine hoist. International Education & Research Journal, Engineering 1 (5), 70-74 (2015).
[9] S. Wolny, Displacements in mechanical systems due to random inputs in a mine hoist installation. Engineering Transactions 65 (3), 513-522 (2017).
[10] S. Wolny et al., Research work, Opracowanie kryteriów oceny konstrukcji nośnej naczyń górniczych wyciągów szybowych w aspekcie przedłużenia okresu bezpiecznej eksploatacji. Katedra Wytrzymałości Materiałów i Konstrukcji, AGH University of Science and Technology, Kraków (2003) (unpublished).
[11] A . Pieniążek, J. Weiss, A. Winiarz, Procesy stochastyczne w problemach i zadaniach. Wydawnictwo Politechniki Krakowskiej, Kraków (1999).
[12] V.A. Sretlickij, Slucajnye kolebanija mechaniceskich system. Moskva: Masinostroenie (1976).
[13] S. Wolny, Loads experienced by load-bearing components of mine hoist installations due to random irregularities and misalignments of the guide strings. Journal of Machine Construction and Maintenance 3 (110), 79-86 (2018).
[14] S. Wolny, S. Badura, Wytrzymałość cięgien nośnych górniczego naczynia wydobywczego. Journal of Civil Engineering, Environment and Architecture 34 (64), 149-158 (2017).
[15] S. Kawulok, Oddziaływanie zbrojenia szybu na mechanikę prowadzenia naczynia wyciągowego. Prace GIG, Katowice (1989).
[16] Przepisy górnicze „Rozporządzenie Rady Ministrów z dnia 30 kwietnia 2004 r. w sprawie dopuszczenia do stosowania w zakładach górniczych (Dz.U. Nr 99, poz. 1003 z 2005 r. Nr 80, poz. 695 oraz z 2007 r. Nr 249, poz. 1853, pkt 1.2 Naczynia wyciągowe” (2004).
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Autorzy i Afiliacje

Stanisław Wolny
1
ORCID: ORCID

  1. AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Krakow, Poland
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Abstrakt

It is commonly known that the cause of serious accidents in underground coal mining is methane. Thus, computational fluid dynamics (CFD) becomes a useful tool to simulate methane dispersion and to evaluate the performance of the ventilation system in order to prevent mine accidents related to methane. In this study, numerical and experimental studies of the methane concentration and air velocity behaviour were carried out. The experiment was conducted in an auxiliary ventilated coal heading in Turkish Hard Coal Enterprises (TTK), which is the most predominant coal producer in Turkey. The simulations were modeled using Fluent-Ansys v.12. Significant correlations were found when experimental values and modeling results were compared with statistical analysis. The CFD modeling of the methane and air velocity in the headings especially uses in auxiliary ventilation systems of places where it is hard to measure or when the measurements made are inadequate.
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Bibliografia

[1] J. Toraño, S.Torno, M. Menendez, M. Gent, J. Velasco, Models of methane behaviour in auxiliary ventilation of underground coal mining. Int. J. of Coal Geology 80 (1), 35-43 (2009).
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Autorzy i Afiliacje

Gülnaz Daloğlu
1
Mustafa Önder
1
Teresa Parra
2

  1. Eskişehir Osmangazi Üniversitesi Müh. Mim. Fak. Maden Mühendi sliği Bölümü, 26480 Eskişehir, Turkey
  2. University of Valladolid, Department of Energy and Fluid Mechanics, Valladolid, Spain
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Abstrakt

The impact of caulking of goafs after mining exploitation of a hard coal seam with caving is expressed as the change in value of a a exploitation coefficient which, as defined, is the quotient of the maximum reduction in the surface height of a complete or incomplete trough to the thickness of the exploited seam. The basis for determining the value of the exploitation coefficient was geological and mining data combined with the results of the measurement of subsidence on the surface – measuring line 1222-1301 – of the Ruda mine. There, mining was carried out between 2005 and 2019, with a transverse longwall system and the caulking of goafs. The research team used two methods to determine the impact of the caulking applied in the goafs on the value of the exploitation coefficient. In the first method the goafs are filled evenly along the whole longwall, and in the second method unevenly and on a quarterly basis. The determination of the values of the exploitation coefficients for selected measuring points was preceded by the determination of the parameters of the Knothe-Budryk theory, which was further developed by J. Białek. The obtained dependencies are linear and the values of the correlation coefficients fall between –0.684 and –0.702, which should be considered satisfactory in terms of experimental data. It is possible to reduce the value of the exploitation coefficient by caulking the goafs by about 18%, when filling the goafs to 0.26% of the height of the active longwall.
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Bibliografia

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[3] Y. Jiang, R. Misa, K. Tajduś, A. Sroka, A new prediction model of surface subsidence with Cauchy distribution in the coal mine of thick topsoil condition. Archives of Mining Sciences 65 (1), 147-158 (2020), doi: 10.24425/132712
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Autorzy i Afiliacje

Andrzej Kowalski
1
ORCID: ORCID
Jan Białek
2
ORCID: ORCID
Tadeusz Rutkowski
3
ORCID: ORCID

  1. Central Mining Institute, 1 Gwarków Sq., 40-166 Katowice, Poland
  2. Silesian University of Technology, 2A Akademicka Str., 44-100 Gliwice, Poland
  3. PGG S.A. KWK Ruda, Ruda Śląska, Poland
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Abstrakt

Stability control of the roof is the key to safe and efficient mining of the longwall working face for a steeply dipping coal seam. In this study, a comprehensive analysis was performed on the roof destruction, migration, and filling characteristics of a steeply dipping longwall working face in an actual coalmine. Elastic foundation theory was used to construct a roof mechanics model; the effect of the coal seam inclination angle on the asymmetric deformation and failure of the roof under the constraint of an unbalanced gangue filling was considered. According to the model, increasing the coal seam angle, thickness of the immediate roof, and length of the working face as well as decreasing the thickness of the coal seam can increase the length of the contact area formed by the caving gangue in the lower area of the slope. Changes to the length of the contact area affect the forces and boundary conditions of the main roof. Increasing the coal seam angle reduces the deformation of the main roof, and the position of peak deflection migrates from the middle of the working face to the upper middle. Meanwhile, the position of the peak rotation angle migrates from the lower area of the working face to the upper area. The peak bending moment decreases continuously, and its position migrates from the headgate T-junction to the tailgate T-junction and then the middle of the working face. Field test results verified the rationality of the mechanics model. These findings reveal the effect of the inclination coal seam angle on roof deformation and failure and provide theoretical guidance for engineering practice.
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Bibliografia

[1] Y.P. Wu, D.F Yun, P.S. Xie et al., Progress, practice and scientific issues in steeply dipping coal seams fullymechanized mining. J. China Coal Soc. 45 (01):24-34 (2020) (in Chinese).
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[3] D .Y. Zhu, W.L. Gong, Y. Su et al., Application of High-Strength Lightweight Concrete in Gob-Side Entry Retaining in Inclined Coal Seam. Advances in Materials Science and Engineering (2020). doi: 10.1155/2020/8167038
[4] H .W. Wang, Y.P. Wu, J.Q. Jiao et al., Stability Mechanism and Control Technology for Fully Mechanized Caving Mining of Steeply Inclined Extra-Thick Seams with Variable Angles. Mining, Metall. Explor. (2020). doi: 10.1007/ s42461-020-00360-0
[5] R .A. Frumkin, Predicting rock behaviour in steep seam faces (in Russian). International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 20 (1), A12-A13 (1983). doi: 10.1016/0148-9062(83)91717-5
[6] A. Ladenko, Improvements in working steep seams. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 11 (12), 247. (1974). doi: 10.1016/0148-9062(74)92108-1
[7] Z. Rak, J. Stasica, Z. Burtan et al., Technical aspects of mining rate improvement in steeply inclined coal seams: A case study. Resources 9 (12), 1-16 (2020). doi: 10.3390/resources9120138
[8] H .S. Tu, S.H. Tu, C. Zhang et al., Characteristics of the Roof Behaviours and mine pressure manifestations during the mining of steep coal seam. Arch. Min. Sci. 62 (4), 871-890 (2020).
[9] P .S. Xie, Y.P. Wu, Deformation and failure mechanisms and support structure technologies for goaf-side entries in steep multiple seam mining disturbances. Arch. Min. Sci. 64 (3), 561-574 (2019). doi: 10.24425/ams.2019.129369
[10] Z.Y.Wang, L.M. Dou, J. He et al., Experimental investigation for dynamic instability of coal-rock masses in horizontal section mining of steeply inclined coal seams. Arabian Journal of Geosciences 13, 15 (2020). doi: 10.1007/ s12517-020-05753-5
[11] P .S. Xie, Y. Luo, Y.P. Wu et al., Roof Deformation Associated with Mining of Two Panels in Steeply Dipping Coal Seam Using Subsurface Subsidence Prediction Model and Physical Simulation Experiment. Mining, Metall. Explor. 37 (2), 581-591 (2020). doi: 10.1007/s42461-019-00156-x
[12] X.P. Lai, H. Sun, P.F. Shan et al., Structure instability forecasting and analysis of giant rock pillars in steeply dipping thick coal seams. Int. J. Miner. Metall. Mater. 22 (12), 1233-1244 (2015). doi: 10.1007/s12613-015-1190-z
[13] Y.P. Wu, B.S. Hu, P.S. Xie, A New Experimental System for Quantifying the Multidimensional Loads on an on-Site Hydraulic Support in Steeply Dipping Seam Mining. Exp. Tech. 43 (5), 571-585 (2019). doi: 10.1007/s40799-019- 00304-4
[14] Y.D. Zhang, J.Y. Cheng, X.X. Wang et al., Thin plate model analysis on roof break of up-dip or down-dip mining stope. J. Min. Saf. Eng. 27 (4), 487 (2010) (in Chinese).
[15] J.R. Cao, L.M. Dou, G.A. Zhu et al., Mechanisms of Rock Burst in Horizontal Section Mining of a Steeply Inclined Extra-Thick Coal Seam and Prevention Technology. Energies 13 (22), 6043 (2020). doi: 10.3390/en13226043
[16] H .W. Wang, Y.P. Wu, M. Liu et al., Roof-breaking mechanism and stress-evolution characteristics in partial backfill mining of steeply inclined seams. Geomatics, Natural Hazards and Risk 11 (1), 2006-2035 (2020). doi: 10.1080/1 9475705.2020.1823491
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Autorzy i Afiliacje

Shenghu Luo
1
ORCID: ORCID
Tong Wang
2
ORCID: ORCID
Yongping Wu
2
ORCID: ORCID
Jingyu Huangfu
2
ORCID: ORCID
Huatao Zhao
3
ORCID: ORCID

  1. Xi’an University of Science and Technology, Department of Mechanics, China
  2. Xi’an University of Science and Technology, School of Energy Engineering, China
  3. Shandong Mining Machinery Group Co., Ltd. China
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Abstrakt

Underground mining development is directly related to face drilling rig performance. Reducing operating costs and improving productivity are current and crucial topics for mining projects around the world within the development phase. Unlike past approaches, this article is based on variations of equipment availability and utilisation, and their impact on development plans success and costs decrease. To assess the influence of these parameters, daily field data were collected to identify major downtimes in normal cycles and apply adequate corrective measures to mitigate them. Additionally, this article presents the reader with a graphic illustration of the correlation between utilisation and development, including historical data. This paper was developed from October 2017 to March 2018. The result of this study seeks to identify when projects generate profits by comparing four situations with constant productivity, but variables such as the possession rate, maintenance fee, production and utilisation. Finally, it is demonstrated that success in mining projects, related to equipment, is proportional to the utilisation of the fleet, with the correct management of productivities.
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Bibliografia

[1] S. Elevli, B. Elevli, Performance Measurement of Mining Equipments by Utilizing OEE. Acta Montan. Slovaca 15, 95-101 (2010),
[2] C. Hegde, K.E. Gray, Use of machine learning and data analytics to increase drilling efficiency for nearby wells. Journal of Natural Gas Science and Engineering 40, 327-335 (2017). https://doi.org/10.1016/j.jngse.2017.02.019
[3] B . A. Kansake, R. S. Suglo, Impact of Availability and Utilization of Drill Rigs on Production at Kanjole Minerals Limited. International Journal of Science, Environment and Technology 4, 6, 1524-1537.
[3] J. Valivaara, Automated Drilling Features for Improving Productivity and Reducing Costs in Underground Development. Global Trends, 9-11.
[4] B . Samatemba, L. Zhang, Evaluating and optimizing the effectiveness of mining equipment; the case of Chibuluma South underground mine. Journal of Cleaner Production 252 119697 (2020).
[5] D . Henao, MBA thesis, Aplicación de la Metodología Kaizen a las operaciones en la mina en la empresa de explotación de cobre Miner S.A. Universidad Eafit, Escuela de Administración, Medellín (2019).
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Autorzy i Afiliacje

Sebastian Arenas Bermúdez
1
ORCID: ORCID
Cristian Gerardo Zapata Otalora
1
Jorge Martin Molina Escobar
1
ORCID: ORCID

  1. Universidad Nacional de Colombia, Mines Faculty, Colombia
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Abstrakt

Use of the poroelasticity theory by Biot in the description of rock behaviour requires the value of the e.g. Biot coefficient α to be determined. The α coefficient is a function of two moduli of compressibility: the modulus of compressibility of the rock skeleton Ks and the effective modulus of compressibility K. These moduli are determined directly on the basis of rock compressibility curves obtained during compression of a rock sample using hydrostatic pressure. There is also a concept suggesting that these compressibility moduli might be determined on the basis of results of the uniaxial compression test using the fact that, in the case of an elastic, homogeneous and isotropic material, the modulus of compressibility of a material is a function of its Young modulus and its Poisson ratio. This work compares the results obtained from determination of the Biot coefficient by means of results of compressibility test and uniaxial compression test. It was shown that the uniaxial compression test results are generally unsuitable to determine the value of the coefficient α. An analysis of values of the determined moduli of compressibility shows that whereas the values of effective moduli of compressibility obtained using both ways may be considered as satisfactorily comparable, values of the relevant rock skeleton moduli of compressibility differ significantly.
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Bibliografia

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[6] J . Gustkiewicz, Compressibility of rocks with a special consideration given to pore pressure. In: Thismus et al. (Eds.), Poromechanics – A Tribute to Maurice A. Biot. Proceedings of the Biot Conference on Poromechanics, Louvain-la-Neuve (Belgium), 14-16 September 1998, Balkema, Rotterdam (1998).
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[13] Z .T. Bieniawski, J.A. Franklin, M.J. Bernede, P. Duffaut, F. Rumpel, T. Horibe, F. Broch, E. Rodrigues, W.E. van Heerden, U.W. Vogler, I. Hansagi, J. Szlavin, B.T. Brady, D.U. Deere, I. Hawkes, D. Milovanovic, Suggested Methods for Determining the Uniaxial Compressive Strength and Deformability of Rock Materials. Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. 16 (2), 135-140 (1979).
[14] K . Kovári, A. Tisa, H.H. Einstein, J.A. Franklin, Suggested Methods for Determining the Strength of Rock Materials in Triaxial Compression: Revised Version. Int. J. Rock Mech. Min. Sci. & Geomech. Abstr. 20 (6), 283-290 (1983).
[15] M. Długosz, J. Gustkiewicz, A. Wysocki, Apparatus for investigation of rock in three-axial state of stress. Part I. Characteristics of the apparatus and of the investigation method. Arch. Min. Sci. 26 (1), 17-28 (1981).
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[19] R. Přikryl, J. Prikrylová, M. Racek, Z. Weishauptová, K. Kreislová, Decay mechanism of indoor porous opuka stone: a case study from the main altar located in the St. Vitus Cathedral. Environmental Earth Sciences 76 (2017).
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Autorzy i Afiliacje

Andrzej Nowakowski
1
ORCID: ORCID
Janusz Nurkowski
1
ORCID: ORCID

  1. Strata Mechanics Research Institute of the Polish Academy of Science, 27 Reymonta Str., 30-059 Kraków, Poland

Instrukcja dla autorów

General information

It is essential for us that authors write and prepare their manuscripts according to the instructions and specifications listed below. Therefore, authors are strongly encouraged to read these instructions carefully before preparing a manuscript for submission.

Archives of Mining Sciences (AMS) is concerned with original research, new developments and case studies in all fields of mining sciences which include:

- mining technologies,

- stability of mine workings,

- rock mechanics,

- geotechnical engineering and tunnelling,

- mineral processing,

- mining and engineering geology,

- mining geophysics,

- mining geodesy

- ventilation systems,

- environmental protection in mining,

- economical aspects in mining,

- mining machine science.

Papers are welcomed on all relevant topics and especially on theoretical developments, analytical methods, numerical methods, rock testing, site investigation, and case studies.

AMS publishes research and review articles, technical notes.

Papers suitable for publication in AMS are those which:

- contain original work - the main result is not published elsewhere neither by the authors nor somebody else, and is not currently under consideration for publication in any other journal,

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The abstract should briefly summarize the most important results reported in the paper (up to 200 words).

Keywords.4-6 keywords

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References

A bibliography without numbering, arranged alphabetically according to the author’s last name, should include all positions referring in the text. In case of more than one article from the same year, the articles should be differentiated as follows: 1985a, 1985b, etc. The following order is required: last name and initials of all co-authors, year, title, type of publications, (journal, conference material, collection of monograph articles, unpublished texts) with the page numbers used.

Quoting references

Name(s) of the author(s) should be provided in parentheses. e.g.: (Brandt, 1993), (Crosdale & Beamish, 1994). (Dziurzynski et al., 1990) in the case of one, two or more than two authors, respectively. If the name(s) of the author(s) is included in the text, then the reference should be cited as follows e.g.: „According to Brandt (1993)...”

Example of bibliography.

Brandt, J., 1993. Neuere Erkentnisse auf dem Gebiet der Gasausbruchprognose. Glückauf Forschungshefte 54, 5, 228-233.

Crosdale, P. J., Beamish, B.B., 1994. Methane sorption studies at South Bulli (NSW) & Central (QLD) collieries using a high-pressure microbalance. 28 Newcastle Symposium on „Advances in the study of Sydney Basin”, Newcastle, NSW, Australia, 15-17 April, 118-125.

Dziurzynski, W., Trutwin W., Tracz J., 1990. Symulacja komputerowa przepływu powietrza i gazów powyrzutowych w sieci wentylacyjnej kopalni. J. Litwiniszyn (Ed.), Górotwór jako ośrodek wielofazowy; Wyrzuty skalno-gazowe. Wydawnictwo AGH, Kraków, Vol. II, 743-758.

Lama R. D., Bodziony, J., 1996. Outbursts of gas, coal and rock in underground mines. Publisher Lama & Associates, 130 Brokers Road, Mt. Pleasant, NSW 2519, Australia.

Nekrasovski, Ya. E., 1951. Razrabotka plastov podverzhennykh vnezapnym vybrosam ugla i gaza. Ugletekhizdat, Moskva.

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