Науковий вісник НГУ

Peculiarities of mining the protecting pillar in the laminal massif of soft rocks

• 
• 

User Rating:  / 1

PoorBest 

Details

Category: Contens №5 2020

Last Updated on 31 October 2020

Published on 30 October 2020

Hits: 3124

Authors:

V. I. Bondarenko, orcid.org/0000-0001-7552-0236, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

I. A. Kovalevska, orcid.org/0000-0003-2936-9680, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

H. A. Symanovych, orcid.org/0000-0002-2121-1742, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

M. V. Barabash, “DTEK Energy” LLC, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V. H. Snihur, MM “Heroiv Kosmosu”, PJSC “DTEK Pavlohradvuhillia”, Pavlohrad, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (5): 017-025

https://doi.org/10.33271/nvngu/2020-5/017

Abstract:

Purpose. Increasing the completeness of mining coal reserves from protecting pillars located in a laminal massif of soft rocks in the roof and bottom in order to reduce the coal losses in mines and horizons in case when mining operations are at the stage of completion.

Methodology. A geomechanical model is developed for research into mining of protecting pillars influenced by stope works, taking into account the laminal massif and rheological processes of creep deformations and stress relaxation of the rock massif. Numerical modelling and analysis of the stress-strain state of the massif are conducted. Conclusions are drawn in terms of substantiation of the technical solutions for mining the protecting pillars.

Findings. New patterns have been determined of the stress-strain state of a laminal rock massif in the zone influenced by stope works. A geomechanical model has been developed for mining the protecting pillars with account of rheological processes in the rocks, and the technological parameters of mining the coal from longwall faces have been substantiated. A possibility is provided for repeated use of mine workings by introducing a resource-saving fastening system.

Originality. The patterns have been determined of the frontal bearing pressure zone displacement ahead of the longwall face during mining the protecting pillars, as well as the concentration factor Ky = 1.1–1.3 at a height from the c₆ coal seam up to 18–20 m, when contacting the thick siltstone. It was found that the calculated compressive resistance is by 4.2 times higher than the value of acting s_y and, according to this factor, siltstone maintains continuity through all its thickness. When approaching the seam, vertical stress concentration increases and is already Ky = 1.9–2.7. Based on the account and analysis of these factors, one can assert that the roof of the seam and the seam itself are not destroyed.

Practical value. Technological solutions have been developed for mining the protecting pillars to increase the completeness of coal reserves extraction while reducing its production costs and increasing the safety of stope operations by means of decreasing the rock pressure onto powered support.

References.

1. Kovalevska, I., Zhuravkov, M., Chervatiuk, V., Husiev, O., & Snihur, V. (2019). Generalization of trends in the influence of geomechanics factors on the choice of operation modes for the fastening system in the preparatory mine workings. Mining of Mineral Deposits, 13(3), 1-11. https://doi.org/10.33271/mining13.03.001.

2. Skipochka, S., Krukovskyi, O., Serhiienko, S., & Krasovskyi, I. (2019). Non-destructive testing of rock bolt fastening as an element of monitoring the state of mine workings. Mining of Mineral Deposits, 13(1), 16-23. https://doi.org/10.33271/mining13.01.016.

3. Małkowski, P., Niedbalski, Z., & Majcherczyk, T. (2016). Roadway design efficiency indices for hard coal mines. Acta Geodynamika et Geomaterialia, 13(2), 201-211. https://doi.org/10.13168/AGG.2016.0002.

4. Niedbalski, Z., Małkowski, P., & Majcherczyk, T. (2018). Application of the NATM method in the road tunneling works in difficult geological conditions – The Carpathian flysch. Tunnelling and Underground Space Technology, (74), 41-59. https://doi.org/10.1016/j.tust.2018.01.003.

5. Tymoshchuk, V., Tishkov, V., & Soroka, Yu. (2018). Hydro and geomechanical stability assessment of the bund wall bottom slope of the Dniprovsk tailing dump. Mining of Mineral Deposits, 12(1), 39-47. https://doi.org/10.15407/mining12.01.039.

6. Malkowski, P., & Ostrowski, L. (2019). Convergence monitoring as a basis for numerical analysis of changes of rock-mass quality and Hoek-Brown failure criterion parameters due to longwall excavation. Archives of Mining Sciences, 64(1), 93-118. https://doi.org/10.24425/ams.2019.126274.

7. Lozynskyi, V., Medianyk, V., Saik, P., Rysbekov, K., & Demydov, M. (2020). Multivariance solutions for designing new levels of coal mines. Rudarsko Geolosko Naftni Zbornik, 35(2), 23-32. https://doi.org/10.17794/rgn.2020.2.3.

8. Bondarenko, V., Kovalevska, I., Symanovych, H., Barabash, M., & Snihur, V. (2018). Assessment of parting rock weak zones under the joint and downward mining of coal seams. E3S Web of Conferences, (66), 03001. https://doi.org/10.1051/e3sconf/20186603001.

9. Bock, S., & Prusek, S. (2015). Numerical study of pressure on dams in a backfilled mining shaft based on PFC3D code. Computers and Geotechnics, (66), 230-244. https://doi.org/10.1016/j.compgeo.2015.02.005.

10. Bondarenko, V., Kovalevska, I., Symanovych, G., Sotskov, V., & Barabash, M. (2018). Geomechanics of interference between the operation modes of mine working support elements at their loading. Mining Science, (25), 219-235. https://doi.org/10.5277/msc182515.

11. Babets, D., Sdvyzhkova, O., Shashenko, O., Kravchenko, K., & Cabana, E.C. (2019). Implementation of probabilistic approach to rock mass strength estimation while excavating through fault zones. Mining of Mineral Deposits, 13(4), 72-83. https://doi.org/10.33271/mining13.04.072.

12. Kovalevska, I., Barabash, M., & Snihur, V. (2018). Development of a research methodology and analysis of the stress state of a parting under the joint and downward mining of coal seams. Mining of Mineral Deposits, 12(1), 76-84. https://doi.org/10.15407/mining12.01.076.

13. Busylo, V., Savelieva, T., Serdyuk, V., Koshka, A., & Morozova, T. (2015). Substantiating parameters of process design of contiguo11us seam mining in the Western Donbas mines. New Developments in Mining Engineering, 1725. https://doi.org/10.1201/b19901-5.

14. Kuzlo, M. T., Moshynskyi, V. S., & Martyniuk, P. M. (2018). Mathematical modelling of soil massif’s deformations under its drainage. International Journal of Applied Mathematics, 31(6), 751-762. https://doi.org/10.12732/ijam.v31i6.5.

15. Khalymendyk, I., & Baryshnikov, A. (2018). The mechanism of roadway deformation in conditions of laminated rocks. Journal of Sustainable Mining, 17(2), 41-47. https://doi.org/10.1016/j.jsm.2018.03.004.

16. Sdvizhkova, Ye. A., Babets, D. V., & Smirnov, A. V. (2015). Support loading of assembly chamber in terms of Western Donbas plough longwall. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (5), 26-32.

17. Lozynskyi, V., Saik, P., Petlovanyi, M., Sai, K., & Malanchyk, Z. (2018). Analytical Research of the Stress-Deformed State in the Rock Massif Around Faulting. International. Journal of Engineering Research in Africa, (35), 77-88. https://doi.org/10.4028/www.scientific.net/JERA.35.77.

18. Dychkovskyi, R., Vladyko, O., Maltsev, D., & Cáceres Cabana, E. (2018). Some aspects of the compatibility of mineral mining technologies. Rudarsko-Geološko-Naftni Zbornik, 33(4), 73-82. https://doi.org/10.17794/rgn.2018.4.7.

19. Fomychov, V., Mamaikin, O., Demchenko, Y., Prykhorchuk, O., & Jarosz, J. (2018). Analysis of the efficiency of geomechanical model of mine working based on computational and field studies. Mining of Mineral Deposits, 12(4), 46-55. https://doi.org/10.15407/mining12.04.046.

20. Rotkegel, M., & Grodzicki, M. (2018). The concept of the modification and analysis of the strength of steel roadway supports for coal mines in the Soma Basin in Turkey. Studia Geotechnica et Mechanica, 40(1), 38-45. https://doi.org/10.2478/sgem-2018-0006.

• < Prev
• Next >