Науковий вісник НГУ

Effect of geological and technological parameters on the convergence in a stope

• 
• 

User Rating:  / 0

PoorBest 

Details

Category: Content №6 2021

Last Updated on 29 December 2021

Published on 30 November -0001

Hits: 4699

Authors:

S.F.Vlasov, orcid.org/0000-0002-5537-6342, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Ye.V.Moldavanov, orcid.org/0000-0002-6593-6462, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2021, (6): 016 - 022

https://doi.org/10.33271/nvngu/2021-6/016

Abstract:

Purpose. To study regularities in changes in convergence of wall rocks along a setting line of the powered props depending upon the sandstone availability within the roof, mining depth, as well as its position relative to the coal seam along the length of the extraction column based on the results of numerical experiments and forecast probable zones of rigid settlement of the powered support units according to a longwall length at any moment of a stope arrangement along the extraction pillar in accordance with changes in geological and technological parameters.

Methodology. The paper represents numerical experiments based upon 3D computer modelling of incremental stope advance within a layered transverse and isotopic rock mass while applying Solid Works Simulation 2019 software.

Findings. The research results, concerning the nature of wall rock distribution value within a stope, are given. The results were obtained using incremental computer modelling of the longwall advance within a layered transverse and isotopic rock mass within the area of initial caving of the main roof.

Originality. In the context of the Western Donbas mines, regularities of convergence value of wall rock distribution have been determined depending upon certain changes in such a system of geological and technological parameters as: availability of sandstone with 5 and 30 m thickness both within the immediate rock and at 30 m distance as well as nonavailability of sandstone within a roof; 215, 260 and 305 m changes in longwall length; 150, 300 and 450 m changes within a zone of initial caving of the main roof (1545 m) with 10 m increment of longwall distancing from an installation chamber at 1050 m distances.

Practical value. The identified regularities of changes in convergence value make it possible to forecast probable zones of rigid settlement of the powered support units depending upon the longwall length at any moment of a stope location along the extraction pillar irrespective of mining depth. The abovementioned helps optimize the parameters of seam extraction for the conditions of the Western Donbas mines if required.

Keywords: mining depth, longwall length, computer modelling, convergence, sandstone thickness, numerical experiments

References.

1. Vlasov, S.F., & Sydelnykov, A.A. (2012). Spatial modeling of geomechanical processes in underground mining. Dnipropetrovsk: National Mining University. ISBN: 978-966-350-348-6.

2. Bondarenko, V.I., Kovalevska, I.A., Symanovych, G.A., Sotskov,V.A., & Barabash, M.V. (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.

3. Ang, L., Qiang, M., Li, M., Li, K., Qian, M., & Jianbo, C. (2020). Coal Mine Abutment Pressure Distribution Based on a Strain-Softening Model. Frontiers in Physics, 8(263), 1-15. https://doi.org/10.3389/fphy.2020.00263.

4. Sreenivasa, R.I., 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.

5. 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.

6. 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.

7. 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, 7(53), 18-30. https://doi.org/10.1007/s40948-021-00252-7.

8. 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.

9. Behera, B., Yadav, A., Singh, G.P., & Sharma, S.K. (2020). A numerical modeling approach for evaluation of spalling associated face instability in longwall workings under massive sandstone roof. Engineering Failure Analysis, 117, 225-236. https://doi.org/10.1016/j.Engfai lanal.2020.104927.

10. Dychkovskyi, R., Shavarskyi, I., Saik, P., Lozynskyi, V., Falshtynskyi, V., & Cabana, E. (2020). Research into stress-strain state of the rock mass condition in the process of the operation of double-unit longwalls. Mining of Mineral Deposits, 14(2), 85-94. https://doi.org/10.33271/mining 14.02.085.

11. Vlasov, S.F., & Moldavanov, Y.V. (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), 1-13. https://doi.org/10.31474/1999-981x-2021-1-37-48.

• < Prev
• Next >