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Assessing the impact of underground working (tunneling) in the II section of Seam 14 on surface construction works at Ha Lam Coal Mine (Vietnam)

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Category: Content №4 2022

Last Updated on 29 August 2022

Published on 30 November -0001

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Authors:

Tien Trung Vu, orcid.org/0000-0002-3725-2127, Hanoi University of Mining and Geology, Socialist Republic of Vietnam, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Doan Viet Dao, orcid.org/0000-0002-5586-7993, Hanoi University of Mining and Geology, Socialist Republic of Vietnam, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2022, (4): 039 - 044

https://doi.org/10.33271/nvngu/2022-4/039

Abstract:

Purpose. Tunneling in the ground changes the initial equilibrium stress state of the rock, which is also the cause of displacement and deformation of the surrounding rock mass. To determine the impact of tunneling on surface construction works in order to ensure the safety of surface works by analyzing the displacements and deformations of the rock mass during tunneling in the IIsection of Seam 14 at Ha Lam Coal Mine.

Methodology. To achieve the research results, actual field survey methods, data analysis and numerical modeling, as well as combined blasting vibration methods are used.

Findings. After analyzing the numerical modeling results, an area has been identified in the II section of Seam 14 of the Ha Lam Coal Mine that affects the surface construction works and is located within a radius of about 20 m from the portal of two inclined shafts. The results of blasting vibrations are calculated on the basis of the passport of blasting operations in tunnels. Thus, the affected area has been identified within a radius of 30.5m. However, at a distance of 30.5 m, surface construction works are not in the area of influence.

Originality. On the basis of FLAC software, the authors have developed a simulation model for tunneling, thereby analyzing and describing the best state of deformation and displacement of the surrounding rock mass. In this study, a numerical modeling method is applied to simulate the driving order for each tunnel, which is consistent with the actual production of underground mines. Based on the passport of drilling and blasting operations in tunnels, the authors calculated the impact of blasting vibrations on surface construction works. After that, the authors assessed and identified the affected area with the required degree of reliability.

Practical value. The research results are used as a basis for implementation in actual production at Ha Lam Coal Mine. On the basis of analysis of the surrounding rock mass displacements and deformations, when tunneling in the II section of Seam 14 at Ha Lam Coal Mine, the affected area of the surface construction works has been determined. This is also the basis for Ha Lam Coal Mine when planning construction works on the site outside the determined affected areas to ensure the safety of such works.

Keywords: tunnels, surface construction works, displacement, deformation, Ha Lam Coal Mine

References.

1. Dou, L., & Cao, S. (2010). Strata control in coal exploitation. Beijing, China: China University of Mining and Technology Press.

2. Nguyen, D.T., & Vuong, T.K. (2000). Movement and deformation of rock in mining. Hanoi, Vietnam: Transport Publishing.

3. Asker, K., Fouad, M.T., Bahr, M., & El-Attar, A. (2021). Numerical analysis of reducing tunneling effect on viaduct piles foundation by jet grouted wall. Mining of Mineral Deposits, 15(1), 75-86. https://doi.org/10.33271/mining15.01.075.

4. Phung, M.D. (2011). Report of project: Research and select reasonable technical and technological solutions for coal mining in areas with historical and cultural relics, industrial and civil works. Hanoi, Vietnam: Institute of Mining Science and Technology.

5. Makowski, P., Niedbalski, Z., Majcherczyk, T., & Bednarek, . (2020). Underground monitoring as the best way of roadways support design validation in a long time period. Mining of Mineral Deposits, 14(3), 1-14. https://doi.org/10.33271/mining14.03.001.

6. 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.

7. Wang, C., Wang, Y., & Lu, S. (2010). Deformation behaviour of roadways in soft rocks in underground coal mines and principles for stability control. International Journal of Rock Mechanics and Mining Sciences, (37), 937-946. https://doi.org/10.1016/S1365-1609(00)00026-5.

8. Yang, R., Li, Y., Guo, D., Yao, L., Yang, T., & Li, T. (2017). Failure mechanism and control technology of water-immersed roadway in high-stress and soft rock in a deep mine. International Journal of Mining Science and Technology, 27(2), 245-252. https://doi.org/10.1016/j.ijmst.2017.01.010.

9. Guo, H., Yuan, L., Shen, B., Qu, Q., & Xue, J. (2012). Mining-induced strata stress changes, fractures and gas flow dynamics in multi-seam longwall mining. International Journal of Rock Mechanics and Mining Sciences, 54, 129-139. https://doi.org/10.1016/j.ijrmms.2012.05.023.

10. Nguyen, Q.P., & Pham, V.C. (2013). Investigation on development of geomechanical models for collapse and subsidence prediction in underground coal mining in region Quang Ninh. Journal of Mining and Earth Sciences, (43), 64-71.

11. Nguyen, V.S., Vu, T.L., Tran, V.T., & Le, Q.P. (2013). Research and calculation on the movement and deformation of surface rock in Khe Cham II-IV underground coal mine. Journal of Mining and Earth Sciences, (43), 72-75.

12. Kortas, . (2021). Gravity eld changes during deep exploitation of the coal longwall and their relation to stress distribution and seismic activity. Journal of Sustainable Mining, 20(4), 228-239. https://doi.org/10.46873/2300-3960.1326.

13. Nguyen, A.T., Dao, H.Q., & Le, D.N. (2012). Study on movement and deformation of rock mass in underground coal mining in Quang Ninh area by equivalent material model. Institute of Mining Science and Technology: Mining science and technology information, (10), 18-23.

14. Dang, V.K., Vo, T.H., Do, N.A., Do, N.T., & Dao, V.C. (2020). Stability of Deep Underground Mine Drift through Complex Geology Conditions in Quang Ninh Coal Area. Journal of the Polish Mineral Engineering Society, (220), 221-230. http://doi.org/10.29227/IM-2020-02-27.

15. Dang, V.K., Do, N.A., & Dinh, V.D. (2022). Estimating the radial displacement on the tunnel boundary by rock mass classification systems. International Journal of GEOMATE, 22(92), 9-15. https://doi.org/10.21660/2022.92.19.

16. Pham, T.N., & Nguyen, V.N. (2021). The effects of dynamic pressure on the stability of prepared drifts near the working surface areas. Journal of Mining and Earth Sciences, 62(1), 85-92. https://doi.org/10.46326/JMES.2021.62(1).10.

17. Do, N.T. (2020). Method for ground surface settlement induced by tunnelling. Journal of Mining Industry, (5), 34-38.

18. Do, N.T., & Nguyen, D.T. (2021). Prediction of ground surface settlement induced by twin shield tunnellings in urban conditions. Journal of Mining and Earth Sciences, 62(2), 47-56. https://doi.org/10.46326/JMES.2021.62(2).05.

19. Do, N.T., Dang, V.K., Pham, V.V., & Nguyen, V.Q. (2022). Prediction of surface settlement due to twin tunnel construction in soft ground of Hanoi metro line 03. International Journal of GEOMATE, 62(6), 66-72. https://doi.org/10.21660/2022.94.3209.

20. Explanation, design drawing for the construction of a pair of inclined shafts of +30 to -300 levels. Ha Lam Coal Company (2017). Quang Ninh, Vietnam: Department of Mining Technology.

21. Features of geological conditions in II area of Seam 14. Ha Lam Coal Company (2020). Quang Ninh, Vietnam: Department of Geodesy and Geology.

22. Explanation, design drawings for the construction of the crosscuts at -150 and -300 levels. Ha Lam Coal Company (2017). Quang Ninh, Vietnam: Department of Mining Technology.

23. Ministry of Industry and Trade, Vietnam (2008). Regulation QCVN 02: 2008/BCT on National technical regulation on safety in the storage, transportation, use and disposal of industrial explosive materials. Retrieved from https://vanbanphapluat.co/qcvn-02-2008-bct-an-toan-trong-bao-quan-van-chuyen-su-dung-va-tieu-huy-vat-lieu#:~:text=QCVN02%3A2008%2FBCT-,Quy%20chu%E1%BA%A9n%20k%E1%BB%B9%20thu%E1%BA%ADt%20Qu%E1%BB%91c%20gia%20QCVN%2002%3A2008%2FBCT,v%E1%BA%ADn%20chuy%E1%BB%83n%2C%20s%E1%BB%AD%20d%E1%BB%A5ng%2C%20ti%C3%AAu.

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