Justification of the parameters of the paired workings development technology with the extracting of the pillar between workings by continuous miner

The article considers the issues of developing paired workings in thin seams with leaving the rock in the mine. It is shown that the implementation of the designed technology for workings development by using the set of equipment with continuous miner, rock cutting, mining the pillar between the workings and placing the rock in the worked-out space will make it possible to increase the rate of workings development, eliminate the output of rock from workings development from the mine, and turn from a pillarless panel development layout to the layout with paired workings. The results of physical modeling on equivalent materials of geomechanical processes of displacement of the roof of workings and crosscuts during the workings development and excavation of pillar are presented. For the mining and geological conditions of the Obukhovskaya mine, the situation is considered when the pillar is worked out by crosscuts from the side of the workings passed through to the full cross-section, the behavior of the rock mass during excavation of the pillar is investigated, photofixation is performed and the readings of deformation sensors in the rock mass are reflected. The parameters of the unsupported roof exposure have been determined, at which sensors detect the beginning of roof deformations even before the appearance of visually visible detachments. The maximum allowable roof exposure area has been determined during the excavation of the pillar, at which the roof of the workings remains stable and does not require supporting, which determines the requirements for the supporting pattern for workings and crosscuts.

Kazanin O. I., Evsiukova A. A. Justification of the parameters of the paired workings development technology with the extracting of the pillar between workings by continuous miner. MIAB. Mining Inf. Anal. Bull. 2025;(11-1):23—37. [In Russ]. DOI: 10.25018/0236_1493_2025_111_0_23.

Kazanin O. I., ScD, professor RAS, http://orcid.org/ 0000−0001−9663−6713, Empress Catherine II Saint Peterburg Mining University, 199106, St. Petersburg, 21st Line V. I., 2, Russia, e-mail: Kazanin_OI@pers.spmi.ru;
Evsiukova A. A., Ph.D. student, https://orcid.org/0000−0003−3513−7587, Empress Catherine II Saint Peterburg Mining University, 199106, St. Petersburg, 21st Line V. I., 2, Russia, e-mail: alinka_evsyukova@mail.ru.

Kazanin O. I., e-mail: Kazanin_OI@pers.spmi.ru.

1. Kazanin O. I., Sidorenko А. A., Evsiukova A. A., Liu Zilu. Justification of the longwall panel entries support technology when mining gently inclined coal seams at large depths. Mining Informational and Analytical Bulletin. 2023, no. 9−1, pp. 5–21. [In Russ]. DOI: 10.25018/0236_1493_2023_91_0_5. 
2. Zubov V. P., Quang F. L. Development of resource-saving technology of excavation of hollow coal seams with hard-to-collapse roof rocks (on the example of mines of Quang Ninh coal basin). Journal of Mining Institute. 2022. vol. 257. pp. 795-806. https://doi.org/10.31897/PMI.2022.72. [In Russ].
3. Pashkevich M. A., Alekseenko A. V., Nureev R. R. Formation of ecological damage in the storage of sulfide-containing waste of mineral processing. Journal of Mining Institute. 2023, no. 260, pp. 155–167. [In Russ]. DOI: 10.31897/PMI.2023.32. 
4. Ignatov E. V. State and main tasks of development of longwall mining system at coal mines in Kuzbass: a brief review. Mining Engineering and Technology. 2019, no. 4, pp. 30–49. [In Russ].
5. Meshkov A. A. Solution of actual tasks in preparation of the clearing front. Mining informational and analytical bulletin. 2018, no. S48, pp. 71–78. [In Russ]. DOI: 10.25018/0236−1493−2018−11−48−71−78. 
6. Yarkovich A., Malykhin A. Experience and prospects of rock abandonment in the mines of Western Donbass. Rozrobka rodovyshchy. 2013, no. 2013, pp. 201–206. [In Russ].
7. Zuev B. Yu. Modeling methodology of nonlinear geomechanical processes in block and layered rock massifs on models from equivalent materials // Journal of Mining Institute. 2021. vol. 250. pp. 542–552. DOI: 10.31897/PMI.2021.4.7. [In Russ]. 
8. Le Q. P., Zubov V. P., Phung M. D. Improvement of the loading capacity of narrow coal pillars and control roadway deformation in the longwall mining system. a case study at Khe Cham Coal Mine (Vietnam). Inżynieria Mineralna. 2020, vol. 1, no. 2, pp. 115–122. http://doi.org/10.29227/IM-2020−02−15.
9. Zhao Yanlin, Wang Yixian, Wang Weijun, Tang Liming, Liu Qiang, Cheng Guoming. Modeling of rheological fracture behavior of rock cracks subjected to hydraulic pressure and far field stresses. Theoretical and Applied Fracture Mechanics. 2019, vol. 101, pp. 59—66. DOI: 10.1016/j.tafmec. 2019.01.026. 
10. Liu Z. L., Ma Z. G., Li Y., Gong P., Li K. L., Liu W. A Study on Axial Compression Performance of Large Diameter-Thickness Ratio Concrete-Filled Gas Drainage Steel Pipe. Advances in Civil Engineering. 2021, vol. 2021, pp. 1–10. https://doi.org/10.1155/2021/1479196.
11. Gao Y., Liu D., Zhang X., He M. Analysis and optimization of entry stability in underground longwall mining. Sustainability. 2017, vol. 9, no. 11, p. 2079. https://doi.org/10.3390/su9112079.
12. Piven Y. A., Vasyutina V. V., Kanin V. A. Improvement of the non-cellular ways of protection of preparatory mining excavations. The Journal of Theoretical and Applied Mechanics. 2022, no. 2 (79), pp. 60—65. [In Russ].
13. Kovalskiy E. R., Kongar-Syuryun Ch. B., Sirenko Yu. G., Mironov N. A. Modeling of rheological deformation processes for room and pillar mining at the Verkhnekamsk potash salt deposit. Sustainable Development of Mountain Territories. 2024, vol. 16, no. 3, pp. 1017–1030. [In Russ]. DOI: https://doi. org/10.21177/1998−4502−2024−16−3-1017−1030. 
14. Le T. D., Nguyen C. T., Dao V. C. Estimation of Coal and Rock Mechanical Properties for Numerical Modelling of Longwall Extraction. Inżynieria Mineralna. 2020. DOI: 10.29227/IM-2020−02−07.
15. Zuev B. Yu. Modeling methodology of nonlinear geomechanical processes in block and layered rock massifs on models from equivalent materials. Journal of Mining Institute. 2021, vol. 250, pp. 542—552. [In Russ].
16. Kholodilov A. N., Istomin R. S., Kirilenko V. I. Improvement technique for manufacturing equivalent materials for modeling nonlinear geomechanical processes in underground mineral mining. MIAB. Mining Inf. Anal. Bull. 2024, no. 10, pp. 108—122. [In Russ]. DOI: 10.25018/0236_1493_2024_10_0_108. 
17. Zhukov V. A., Ershova I. V. Experimental methods for assessing the quality of lining materials of furnace chambers of marine boilers. Bulletin of the State University of Sea and River Fleet named after Admiral S. O. Makarov. 2023, vol. 15, no. 1, pp. 126—134.
18. Wu A., Ruan Z., Wang J. Rheological behavior of paste in metal mines. International Journal of Minerals, Metallurgy and Materials. 2022, vol. 29, pp. 717—726. DOI: 10.1007/s12613−022−2423−6. 
19. Xiao Chao, Zheng Huaichang, Hou Xiaolin, Zhang Xiaojun. A stability study of goaf based on mechanical properties degradation of rock caused by rheological and disturbing loads. International Journal of Mining Science and Technology. 2015, vol. 25, no. 5, pp. 741—747. DOI: 10.1016/j. ijmst.2015.07.007. 
20. Shi B., Chen C., Liu P. Rheological properties of combustion metamorphic rock slurry for coalfield fire prevention. Bulletin of Engineering Geology and the Environment. 2021, vol. 80, pp. 8231—8245. DOI: 10.1007/s10064−021−02397-x. 
21. Fang Y., Liu C., Yang H., Yang L. Axial behaviour of concrete-filled corrugated steel tubular column embedded with structural steel. Journal of Constructional Steel Research. 2020, vol. 170, pp. 3–7. https://doi.org/10.1016/j.jcsr.2020.106064.
22. Ahmed M., Liang Q. Q., Patel V. I., Hadi M. N. Behavior of circular concrete-filled double steel tubular slender beam-columns including preload effects. Engineering Structures. 2020, vol. 220, pp. 322–366. https://doi.org/10.1016/j.engstruct.2020.111010.
23. Wang P., Ding L., Ma Y. J., Feng T., Sun G. J., Zhu Y. J., Zuo J., Wang P. et al. A case study on gob-side entry retaining technology in the deep coal mine of Xinjulong, China. Advances in Civil Engineering. 2020, vol. 2020, pp. 1–10. https://doi.org/10.1155/2020/8849093.
24. Ahmed M., Liang Q. Q., Patel V. I., Hadi M. N. Numerical analysis of axially loaded circular high strength concrete-filled double steel tubular short columns. Thin-Walled Structures. 2019, vol. 138, pp. 105–116. https://doi.org/10.1016/j.tws.2019.02.001.
25. Ning J., Wang J., Bu T., Hu S., Liu X. An innovative support structure for gob-side entry retention in steep coal seam mining. Minerals. 2017, vol. 7, no. 5, p. 75. https://doi.org/10.3390/min7050075.
26. Sui Y., Tu Y., Guo Q., Zhang J., Ke F. Study on the behavior of multi-cell composite T-shaped concrete-filled steel tubular columns subjected to compression under biaxial eccentricity. Journal of Constructional Steel Research. 2019, vol. 159, pp. 215–230. https://doi.org/10.1016/j.jcsr.2019.04.033.
27. Wang Z., Zhou X., Wei F., Li M. Performance of special-shaped concrete-filled square steel tube column under axial compression. Advances in Civil Engineering. 2020, vol. 2020. https://doi.org/10.1155/2020/1763142.
28. Patent No. 2827324 C1 Russian Federation, IPC E21C 41/18. Method for driving paired workings in thin, gently sloping coal seams with rock left in the mine: No. 2024105060: filed 28.02.2024: published 24.09.2024 / O. I. Kasanin, A. A. Evsyukova; applicant Federal State Budgetary Educational Institution of Higher Education “Empress Catherine II Saint Peterburg Mining University”. [In Russ].