Physical and Chemical Geotechnologies

Abstract

The article represents the results of modelling the gradual stope movement within a layered transversely isotropic rock mass containing waterlogged layers of roof rocks. The forecast was made within the section from the installation chamber for the displacement value up to 50 meters, with a spacing of 5 meters in eleven stages. Also, as a result of numerical calculation, a pattern of the stress-strain state around the moving stope was obtained. The simulation was performed in order to compare the magnitude of convergence, taking into account both the available and non-available hydrodynamic load. In terms of the development of coal seam C6 of Stepova mine, Pershotravneve Colliery Group, DTEK Pavlogradvuhillia PJSC, regularities of the distribution of lateral rock convergence in the longwall were specified depending on the present waterlogged coal layer being 0.53 m thick and occurring at the distance of 11.2 higher than the roof of the seam under development. The revealed regularities of the changes in convergence value will make it possible to predict the probable zones of rigid settlement of the powered support units along the longwall length at any stope position along the simulated area. The analysis of the results of numerical modelling will help take into account a factor of hydraulic load and optimize the parameters of coal seam development under complicated conditions of the Western Donbas mines.

Keywords: coal seam, hydrodynamic load, landing «on a hard base», layer collectors, longwall, sections of mechanized fastening, waterproof rocks

References

1. Sadovenko, I., & Tymoshchuk, V. (2012). Modelyuvannya mekhanіzmu gіdrogeodinamіchnogo navantazhennya osnovnoї pokrіvlі vugіl’nih plastіv nad mekhanіzovanim krіplennyam ochisnogo viboyu. The Сollection of Research Papers of the National Mining University, (39), 5-11.
2. Symanovych, H., Astafiev, D., & Husiev, O. (2013). On the question of face complex support loading in hard mine-geological conditions. Mining of Mineral Deposits, (7), 81-85.
3. Medianyk, V., Shevchenko, O., & Poymanov, S. (2013). Analysis of coal reserves development on seam С5 mine “Samarskaya” PSS “Mine management Ternovskoe” PJSC “DTEK Pavlogradugol”. Mining of Mineral Deposits, (7), 171-182.
4. Vlasov, S., & Moldavanov, Ye. (2021). Effect of geological and technological parameters on the convergence in a stope. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, (6), 122-131.
5. 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
6. Sreenivasa, R., Debasis, D., & Hemant, K. (2020). Development of a roof-to-floor convergence index for longwall face using combined finite element modelling and statistical approach. International Journal of Rock Mechanics and Mining Sciences, (127), 36-45. https://doi.org/10.1016/j.ijrmms.2020.104221
7. Ze, X., Qiang, l. Y., Guosheng, M., Qiang, X., Chuanjin, T., Liu, Z., ... Qian, S. (2021). Numerical study of stability of mining roadways with 6.0-m section coal pillars under influence of repeated mining. International Journal of Rock Mechanics and Mining Sciences, (138), 139-144. https://doi.org/10.1016/j.ijrmms.2021.104641
8. Jinfu, L., Fuqiang, G., Jinghe, Y., Yanfang, R., Jianzhong, L., Xiaoqing, W., & Lei, Y. (2021). Characteristics of evolution of mining-induced stress field in the longwall panel: insights from physical modeling. International Journal of Coal Science & Technology, (1), 1-18. https://doi.org/10.1007/s40789-020-00390-5
9. Guojun, Z., Quansheng, L., Yong, Z., & Feng, D. (2021). Failure characteristics of roof in working face end based on stress evolution of goaf. Geomechanics and Geophysics for Geo-Energy and Geo-Resources, (53), 18-30. https://doi.org/10.1007/s40948-021-00252-7
10. Jun, L., Changbao, J., Zhuo, J., Wensong, W., Wanjun, Z., & Huan, Y. (2021). Three-dimensional physical model experiment of mining-induced deformation and failure characteristics of roof and floor in deep underground coal seams. Process Safety and Environmental Protection, (150), 400-415. https://doi.org/10.1016/j.psep.2021.04.029
11. DSTU 101.00159226.001-2003. Pravila pіdrobki budіvel, sporud і prirodnih objektіv pri vidobuvannі vugіllya pіdzemnim sposobom (2004).
12. Chetverik, M. S. (2004). Teoriya sdvizheniya massiva gornyh porod i upravlenie deformacionnymi processami pri podzemnoj vyemke uglya. Dnepropetrovsk, 148 p.
13. Vlasov, S., & Moldavanov, Y. (2021). Substantiation of parameters of the experiment with three-dimensional computer modeling of the rock mass around a longwall. Journal of Donetsk Mining Institute, (1), 37-48. https://doi.org/10.31474/1999-981x-2021-1-37-48
14. Sidelnikov, A. A. (2009), Obosnovanie parametrov objomnogo modelirovaniya massiva gornyh porod vokrug ochistnoj i podgotovitelnyh vyrabotok. Geo-Technical Mechanics, (82), 77-85