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Original Paper

UDC 662.33 © V.P. Zubov, Than Van Duy, A.S. Fedorov, 2023

ISSN 0041-5790 (Print) • ISSN 2412-8333 (Online) • Ugol’ – Russian Coal Journal, 2023, № 5, pp. 41-49

DOI: http://dx.doi.org/10.18796/0041-5790-2023-5-41-49




Zubov V.P.1, Than Van Duy1, Fedorov A.S.1

1Saint Petersburg Mining University, St Petersburg, 199106, Russian Federation

Authors Information

Zubov V.P., Doctor of Engineering Sciences, Professor, Mining Department, e-mail: spggi.zubov@mail.ru

Than Van Duy, Postgraduate Student, Mining Department, e-mail: thanduyvp@gmail.com

Fedorov A.S., Associate Professor, Mining Department, e-mail: plyton213@gmail.com


The paper argues that among the promising methods of mining thick (5-12 m) gently dipping coal seams there are methods of coal extraction from the top coal layer. Factors are considered that affect the efficiency of using these mining methods in the mines of the Quang Ninh coal basin (Vietnam) when mining seams with low strength properties. It is noted that mining of such seams is characterized by an increased intensity of spontaneous caving of large masses of coal from the top coal layer and the longwall face into the near-face zone, which has a significant negative impact on mining safety, productivity and costs of coal mining. Data is presented on the parameters of spontaneous coal cavings. It is shown that a significant impact on the intensity of coal caving from the longwall face and the top coal layer is caused by the stage of the deformation processes in the poorly caving rocks of the main roof and the advance rate of the longwall face. The process flow sheets are proposed for mining low-strength coal seams, which include water infusion into the coal seam ahead of the longwall face using mine water or solutions based on mine water.


Thick seam, Low strength properties of coal, Near-face zone of a longwall face, Top coal layer, Spontaneous coal caving, Water infusion into the seam, Process flow sheets.


1. Reyshakhrit E.I., Nevskaya M.A. & Chu Thi Que. Analysis of the state, prospects and problems of the coal industry in Vietnam. Vestnik Evrazijskoj nauki, 2021, Vol. 13, P. 1-15.

2. Litvinenko V.S., Tsvetkov P.S. & Molodtsov K.V. The social and market mechanism of sustainable development of public companies in the mineral resource sector. Eurasian Mining, 2020, (1), pp. 36-41. DOI: 10.17580/em.2020.01.07.

3. Zubov V.P. State and directions of improvement of systems for the development of coal seams at promising coal mines of Kuzbass. Zapiski Gornogo instituta. 2017, (225), pp. 292-297. (In Russ.). DOI: 10.18454/PMI.2017.3.292.

4. Karpov G.N., Kovalski E.R. & Leisle A.V. Analytical studies of strain-stress distribution of rock massif at recovery room T-junctions. International Journal of Advanced Research in Engineering and Technology, 2019, 10(2), pp. 596–607. DOI: 10.34218/IJARET.10.2.2019.056.

5. Sementsov V.V., Osminin D.V. & Nifanov E.V. Stability of drift tunnels in mining seams with poorly caving roofs. Vestnik Nauchnogo centra VostNII po promyshlennoj i ekologicheskoj bezopasnosti, 2021, (3), pp. 14-25. (In Russ.). DOI: 10.25558/VOSTNII.2021.47.12.002.

6. Yaroshenko V.V. Directions to improve the coal recovery factor in mining the Vorkutskoye field reserves. Gornyj informacionno-analiticheskij byulleten?, 2019, (S7), pp. 370-380. (In Russ.). DOI: 10.25018/0236-1493-2019-4-7-370-380.

7. Karpov G.N., Kovalsky E.R. & Smychnik A.D. Determination of rock mass pre-unloading at the end sections of the break-down chamber. Gornyj informatsionno-analiticheskij byulleten?, 2019, (8), pp. 95-107. (In Russ.). DOI: 10.25018/0236-1493-2019-08-0-95-107.

8. Jonek-Kowalska I., Ponomarenko T.V. & Marinina O.A. Problems of interaction with stakeholders during implementation of long-term mining projects. Zapiski Gornogo instituta, 2018, Vol. 232, pp. 428-437. (In Russ.). DOI: 10.31897/PMI.2018.4.428.

9. Gabov V.V., Xuan N.V., Zadkov D.A. & Tho T.D. Increasing the content of coarse fractions in the mined coal mass by a combine using paired cuts. Zapiski Gornogo instituta, 2022, (257), pp. 764-770. (In Russ.). DOI:10.31897/PMI.2022.66.

10. Que Chu Thi, Nevskaya M. & Marinina O. Coal Mines in Vietnam: Geological Condi-tions and Their Influence on Production Sustainability Indicators. Sustainability, 2021, 13(21), 11800. DOI: 10.3390/su132111800.

11. Wang J. Development and prospect on fully mechanized mining in Chinese coal mines. International Journal of Coal Science & Technology, 2014, (1), pp. 253-260.

12. Duong Duc Hai, NguyenLe Duc, Trung Nguyen Ducet al. Increasing Productivity and Safety in Mining as a Chance for Sustainable Development of Vietnam’s Mining Industry. Proceedings of the International Conference on Innovations for Sustainable and Responsible Mining. Springer Nature, 2021, pp. 283-307. DOI:10.1007/978-3-030-60839-2_15.

13. Novoselov S.V., Melnik V.V. & Agafonov V.V. Export-oriented development strategy ofthe coal companies of Russia – the main factor ensuringtheir financial stability. Ugol’, 2017, (11), pp. 54-56. (In Russ.) DOI: 10.18796/0041-5790-2017-11-54-56.

14. Nguyen D.V., Nguyen H.P. & Do T.M. Experimental study on the efficacy of water infusion for underground mining of a coal seam. Applied Sciences, 2019, 9(18), 3820.

15. W.Lei, X. Li, W. Du et al. Research on mechanism and prevention technology of rib spalling in fully-mechanized coal mining face with soft and unstable seam. In IOP Conference Series: Earth and Environmental Science, April2019, 252(5), pp. 052065. IOP Publishing. DOI 10.1088/1755-1315/252/5/052065.

16. Zuev B.Yu. Methodology of modeling nonlinear geomechanical processes in blocky and layered rock masses on models made of equivalent materials. Zapiski Gornogo instituta, 2021, (250), pp. 542-552. (In Russ.).

17. Le Quang Phuc, Dmitriev P.N., Than Van Duy & Li Yunpeng. Influence of the main roof on the parameters of the abutment pressure zone in the selvedge of the seam. Gornyj informatsionno-analiticheskij byulleten?, 2022, (6-1), pp. 68-82. (In Russ.). DOI: 10.25018/0236_1493_2022_61_0_68.

18. Kovalskii E.R. & Gromtsev K.V. Development of the technology of stowing the developed space during mining. Zapiski Gornogo instituta, 2022, (254), pp. 202-209. (In Russ.).

19. Anisimov K.A. & Nikiforov A.V. Present-day technologies for mining diamondiferous deposits. Izvestiya Tomskogo politehnicheskogo universiteta.Inzhiniring georesursov, 2023, Vol. 334, (1), pp. 196-208. (In Russ.). DOI 10.18799/24131830/2023/1/3837.

20. Yeremenko V.A., Lushnikov V.N., Sendi M.P., et al. Justification and selection of methods to drive, support and maintain mine workings in unstable rock formations of deep levels of the Kholbinskiy mine. Gornyj zhurnal, 2013, (7), pp. 59-66. (In Russ.).

21. Sidorov D.V., Potapchuk M.I., Sidlyar A.V. & Kursakin G.A. Assessment of rock-bump hazards in mining of deep levels of the Nikolayevskoye field. Zapiski Gornogo instituta, 2019, (238), pp. 392-398. (In Russ.).

22. Babaskin Yu.G. Ground reinforcement by injection when repairing automobile roads. Minsk, Technoprint Publ., 2002, 176 p. (In Russ.).

23. Order No. 462 of the Federal Service for Environmental, Technological and Nuclear Supervision as of December 14, 2014. On approval of the 'Guidelines for Dust Control in Coal Mines' Federal Norms and Rules in industrial safety.

24. Order No. 327 of the Federal Service for Environmental, Technological and Nuclear Supervision as of August 21, 2017. On approval of the 'Recommendations on safe mining operation in coal seams prone to dynamic phenomena’ Safety Guidelines.


The research was performed at St. Petersburg Mining University as part of the 'Mining of Solid Minerals' scientific school.

For citation

Zubov V.P., Than Van Duy& Fedorov A.S. Technology of underground mining of thick coal seams with low strength properties. Ugol’, 2023, (5), pp. 41-49. (In Russ.). DOI: 10.18796/0041-5790-2023-5-41-49.

Paper info

Received March 9, 2023

Reviewed March 15, 2023

Accepted April 27, 2023


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