Articles
Influence of underground mining activities on the topographic surface, case study of Nui Beo Coal Mine (Vietnam)
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- Category: Content №2 2023
- Last Updated on 28 April 2023
- Published on 30 November -0001
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Authors:
Tien Trung Vu*, orcid.org/0000-0002-3725-2127, Department of Underground Mining, Hanoi University of Mining and Geology, Hanoi, the Socialist Republic of Vietnam, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Hung Duc Pham, orcid.org/0000-0003-4871-4929, Department of Underground Mining, Hanoi University of Mining and Geology, Hanoi, the Socialist Republic of Vietnam
* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2023, (2): 033 - 039
https://doi.org/10.33271/nvngu/2023-2/033
Abstract:
Purpose. Coal mining activities by underground mining method will disrupt the equilibrium of the surrounding rock mass. In underground mining, determining the influence zone of exploiting the longwall on the topographic surface is extremely important.Through analyzing the displacement and deformation of the rock mass when exploiting the longwall 21103 in Seam 11 at Nui Beo Coal Mine, the influence is to be determined of exploiting this longwall on the topographic surface in order to forecast the boundary of the influence zone that may affect the surface works, ensuring the safety of such works.
Methodology. To achieve the research results, actual field survey methods, data analysis and numerical modeling methods are used in this article.
Findings. Analysis of the results from the numerical model determined that the total height of the collapsed and cracked area when exploiting the longwall 21103 in Seam 11 is about 85 m. The subsidence to the ground is about 10 cm from the center of the subsidence area. The analysis results from the numerical model also show that the roof collapse angle is 69°, thereby determining the area of influence on the topographic surface in the range of 55 m. Results on the cross-sections show that the boundary of the influence of mining on the topographic surface is the closest section 6–6, which is about 12 m. The stability time of the collapsed rock mass is determined to be about 5 months.
Originality. On the basis of UDEC (Universal Distinct Element Code) software, the authors have developed a simulation model for the mining process of the longwall 21103 in Seam 11. Analysis of the results from the model has shown the state of displacement and deformation of the surrounding rock mass. In this study, the numerical modeling method is applied to simulate the displacement of the longwall, which is consistent with the actual production of the underground mine. This enabled the authors to assess and identify the affected area with the required degree of reliability.
Practical value. The research results of the paper are used as a basis for implementation in actual production at Nui Beo Coal Mine. On the basis of the analysis of the surrounding rock mass displacements and deformations, when exploiting the longwall 21103 in Seam 11 at Nui Beo Coal Mine, the affected boundary of the topographic surface has been determined. At the same time, the stability time of the collapsed rock mass is also calculated. So, this is also the basis for Nui Beo Coal Mine to plan construction works on the site outside the determined affected areas to ensure the safety of such works.
Keywords: underground mining, displacement and deformation, topographic surface, Nui Beo Coal Mine
References.
1. Zhang, N., Yuan, L., Han, C. L., Xue, J. H., & Kan, J. G. (2012). Stability and deformation of surrounding rock in pillarless gob-side entry retaining. Safety Science, 50(4), 593-599. https://doi.org/10.1016/j.ssci.2011.09.010.
2. Deck, O., & Anirudh, H. (2010). Numerical study of the soil-structure interaction within mining subsidence areas. Computers and Geotechnics, (37), 802-816. https://doi.org/10.1016/j.compgeo.2010.07.001.
3. Marian, M., Işık, Y., Martin, B., & Karel, K. (2012). Influence of underground mining activities on the slope deformation genesis: Doubrava Vrchovec, Doubrava Ujala and Staric case studies from Czech Republic. Engineering Geology, 147-148, 37-51. https://doi.org/10.1016/j.enggeo.2012.07.014.
4. The Prime Minister (2016). Decision No. 403/QD-TTg on approving adjustment of Vietnam coal industry development planning to 2020, with prospects to 2030. Retrieved from https://vanban.chinhphu.vn/default.aspx?pageid=27160&docid=183922.
5. John, C. G., Gao, F. Q., Doug, S., & Davide, E. (2012). Numerical modelling of the effects of weak immediate roof lithology on coal mine roadway stability. International Journal of Coal Geology, (90-91), 100-109. https://doi.org/10.1016/j.coal.2011.11.003.
6. Dao, V. D. (2022). Behavior of twin inclined shafts excavated for 30 levels surface stability in Ha Lam coal mine. Journal of Mining and Earth Sciences, 63(3a), 87-94. https://doi.org/10.46326/JMES.2022.63(3a).10.
7. Nurpeissova, M., Rysbekov, K., Kenesbayeva, A., Bekbassarov, Z., & Levin, E. (2021). Simulation of geodynamic processes. Engineering Journal of Satbayev University, 143(4), 16-24. https://doi.org/10.51301/vest.su.2021.i4.03.
8. Hofmann, G. F., & Scheepers, L. J. (2011). Simulating fault slip areas of mining induced seismic tremors using static boundary element numerical modelling. Journal Mining Technology, 120(1), 53-64. https://doi.org/10.1179/037178411X12942393517291.
9. Pan, R. K., Li, Y., Wang, H., Chen, J., Xu, Y. L., Yang, H. Y., & Cao, S. G. (2021). A new model for the identification of subcritical surface subsidence in deep pillarless mining. Engineering Failure Analysis, (129), 105631. https://doi.org/10.1016/j.engfailanal.2021.105631.
10. Cai, Y., Verdel, T., & Deck, O. (2014). On the topography influence on subsidence due to horizontal underground mining using the influence function method. Computers and Geotechnics, (61), 328-340. https://doi.org/10.1016/j.compgeo.2014.06.003.
11. Vu, T. T. (2022). Solutions to prevent face spall and roof falling in fully mechanized longwall at underground mines, Vietnam. Mining of Mineral Deposits, 16(1), 127-134. https://doi.org/10.33271/mining16.01.127.
12. Yang, D., Qiu, H., Ma, S., Liu, Z., Du, C., Zhu, Y., & Cao, M. (2021). Slow surface subsidence and its impact on shallow loess landslides in a coal mining area. Catena, (209), 105830. https://doi.org/10.1016/j.catena.2021.105830.
13. Donnelly, L. J., Culshaw, M. G., & Bell, F. G. (2008). Longwall mining-induced fault reactivation and delayed subsidence ground movement in British coal fields. Quarterly Journal of Engineering Geology and Hydrogeology, 41(3), 301-314. https://doi.org/10.1144/1470-9236/07-215.
14. Zięba, M., Kalisz, P., & Grygierek, M. (2020). The impact of mining deformations on road pavements reinforced with geosynthetics. Archives of Mining Sciences, 751-767. https://doi.org/10.24425/ams.2020.134145.
15. Ścigała, R., & Szafulera, K. (2020). Linear discontinuous deformations created on the surface as an effect of underground mining and local geological conditions-case study. Bulletin of Engineering Geology and the Environment, (79), 2059-2068. https://doi.org/10.1007/s10064-019-01681-1.
16. Strzałkowski, P. (2019). Some Remarks on Impact of Mining Based on an Example of Building Deformation and Damage Caused by Mining in Conditions of Upper Silesian Coal Basin. Pure and Applied Geophysics, 176, 2595-2605. https://doi.org/10.1007/s00024-019-02127-1.
17. Wang, W., Cheng, Y. P., Wang, H. F., Liu, H. Y., Wang, L., Li, W., & Jiang, J.Y. (2015). Fracture failure analysis of hard–thick sandstone roof and its controlling effect on gas emission in underground ultra-thick coal extraction. Engineering Failure Analysis, (54), 150-162. https://doi.org/10.1016/j.engfailanal.2015.04.016.
18. Jiang, L. H., Atsushi, S., Hani, S. M., Ma, N. J., Liu, H. T., & Hao, Z. (2016). Influence of fracture-induced weakening on coal mine gateroad stability. International Journal of Rock Mechanics and Mining Sciences, 88, 307-317. https://doi.org/10.1016/j.ijrmms.2016.04.017.
19. Vu, T. T. (2022). Determination of the movement and deformation areas of strata when exploiting longwall of Seam 11 under the open-pit mine at Ha Lam Coal Mine, Vietnam. IOP Conference Series: Earth and Environmental Science, (1049), 012009. https://doi.org/10.1088/1755-1315/1049/1/01200.
20. Ministry of Science and Technology, Vietnam (2015). National Regulation TCVN 10673:2015 on Mine Surveying. Retrieved from https://vanbanphapluat.co/tcvn-10673-2015-trac-dia-mo.
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