Numerical simulation of the open pit stability based on probabilistic approach

User Rating:  / 1
PoorBest 

Authors:


S.K.Moldabayev, orcid.org/0000-0001-8913-9014, Satbayev University, Almaty, the Republic of Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.O.Sdvyzhkova, orcid.org/0000-0001-6322-7526, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

D.V.Babets, orcid.org/0000-0002-5486-9268, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.S.Kovrov, orcid.org/0000-0003-3364-119X, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.

T.K.Adil, orcid.org/0000-0002-3019-4286, Satbayev University, Almaty, the Republic of Kazakhstan, 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. 2021, (6): 029 - 034

https://doi.org/10.33271/nvngu/2021-6/029



Abstract:



Purpose.
To identify development regularities related to a stress-strain state and stability of the open pit walls while mining the steeply inclined iron-ore body at various stages of mining considering deterministic and stochastic components of the rock mass structural heterogeneity.


Methodology.
Numerical 3D simulation of the rock stress-strain state; application of the strength reduction procedure to determine a safety factor, taking into account the rock mass heterogeneity based on a stochastic model.


Findings.
The distribution of maximum shear deformations and displacements within the rock mass, making up the pit wall, has been obtained. Potential slide surfaces and safety factors have been determined at various stages of the inclined ore body mining. The effect of the rock mass structure on the pit wall stability has been estimated. A comparison of calculations based on the 3D and 2D models has been carried out. The correction coefficient has been obtained, which allows using the 2D model for multivariate calculations. The relationship of safety factor versus the overall slope angle has been developed.


Originality.
It has been proved that pit walls retain their stability (the stability factor (SF) is not less than 1.27) while mining the steeply inclined ore body with the transverse panels from top to bottom within each newly cut layer, despite the increasing depth of mining. It is shown that modeling of the real geological structure of a three-dimensional rock mass area factors into the decrease in (by 7%) the safety factor in comparison with the results of the homogeneous model. A probabilistic-statistical approach has been proposed to consider the heterogeneity of the rock mass and avoid unreasonably optimistic forecasts of the pit wall stability. It is shown that 3D modeling gives SF, which differs by 8% from the values obtained in the 2D model. This allows substantiating the correction coefficient to improve the 2D modeling results.


Practical value.
The regularity of changes in the pit wall stability has been determined depending on the overall pit slope angle in terms of mining-geological and mining-technical conditions of the Kachar deposit, taking into account the real rock heterogeneity.



Keywords:
ore mining, open pit, wall stability, stochastic environment, numerical simulation, rock stress-strain state, safety factor

References.


1. Gumenik,I., & Lozhnikov, O. (2015). Current condition of damaged lands by surface mining in Ukraine and its influence on environment. InNew developments in mining engineering/Theoretical and practical solution of mineral resources mining,(pp. 139-145). London: Taylor& Francis Group.

2. Moldabayev, S., Rysbaiuly, B., Sultanbekova, Z., & Sarybayev, N. (2019). Methodological approach to creation of the 3D model of an oval-shaped open pit mine. E3S Web of Conferences, 123, 01049. https://doi.org/10.1051/e3sconf/201912301049.

3. Akdag, S., Basarir, H., Karpuz, C., & Ozyurt, M. (2015). Stability Analysis and Optimized Slope Angle for the Iron Ore Open-Pit Mine. In Proceedings of 24th International Mining Congress of Turkey: IMCET 15, 1, 1525. Retrieved from https://www.researchgate.net/publication/279182923_Stability_Analysis_and_Optimized_Slope_Angle_for_the_Iron_Ore_Open-Pit_Mine.

4. Yang, J., Tao, Z., Li, B., Gui, Y., & Li, H. (2012). Stability assessment and feature analysis of slope IN NANFEN open Pit iron mine. International Journal of Mining Science and Technology, 22(3), 329-333. https://doi.org/10.1016/j.ijmst.2012.04.008.

5.Santos, T.B., Lana, M.S., Pereira, T.M., & Canbulat, I. (2019). Quantitative hazard assessment system (Has-Q) for open pit mine slopes. International Journal of Mining Science and Technology, 29(3), 419-427. https://doi.org/10.1016/j.ijmst.2018.11.005.

6.Paradella, W.R., Ferretti, A., Mura, J.C., Colombo, D., Gama,F.F., Tamburini, A., ..., & Gomes, L.L. (2015). Mapping surface deformation in open pit iron mines of Carajs Province (Amazon Region) using an integrated SAR analysis. Engineering Geology, 193, 61-78. https://doi.org/10.1016/j.enggeo.2015.04.015.

7. Hu, Y., Ren, F., Ding, H., Fu, Y., & Tan, B. (2019). Study on the Process and Mechanism of Slope Failure Induced by Mining under Open Pit Slope: A Case Study from Yanqianshan Iron Mine, China. Advances in Civil Engineering, 2019, 1-26. https://doi.org/10.1155/2019/6862936.

8. Tao, Z., Shu, Y., Yang, X., Peng, Y., Chen, Q., & Zhang, H. (2020). Physical model test study on shear strength characteristics of slope sliding surface in Nanfen open-pit mine. International Journal of Mining Science and Technology, 30(3), 421-429. https://doi.org/10.1016/j.ijmst.2020.05.006.

9. Sdvyzhkova, O.O., Shashenko, O.M., & Kovrov, O.S. (2010). Modelling of the rock slope stability at the controlled failure. Rock Mechanics in Civil and Environmental Engineering Proceedings of the European Rock Mechanics Symposium Switzerland: European Rock Mechanics Symposium, EUROCK 2010: 581-584.

10. Zhao, H., Tian, Y., Guo, Q., Li, M., & Wu, J. (2020). The slope creep law for a soft rock in an open-pit mine in the Gobi region of Xinjiang, China. International Journal of Coal Science & Technology, 7(2), 371-379. https://doi.org/10.1007/s40789-020-00305-4.

11. Zevgolis, I.E., Deliveris, A.V., & Koukouzas, N.C. (2019). Slope failure incidents and other stability concerns in surface lignite mines in Greece. Journal of Sustainable Mining, 18(4), 182-197. https://doi.org/10.1016/j.jsm.2019.07.001.

12. Scoppettuolo, M.R., Cascini, L., & Babilio, E. (2020). Typical displacement behavior of slope movements. Landslides, 17(5), 1105-1116. https://doi.org/10.1007/s10346-019-01327-z.

13. Zhang, X., Wang, L., Krabbenhoft, K., & Tinti, S. (2019). A case study and implication: particle finite element modelling of the 2010 Saint-Jude sensitive clay landslide. Landslides, 17(5), 1117-1127. https://doi.org/10.1007/s10346-019-01330-4.

14. Nuri, A., & Nuri, S. (2019). Numerical modeling of transport roads in open pit mines. Journal of Sustainable Mining, 18(1), 25-30. https://doi.org/10.1016/j.jsm.2019.02.005.

15. Roh, J., Scaringi, G., Boh, J., Kycl, P., & Najser, J. (2019). Revisiting strength concepts and correlations with soil index properties: insights from the Dobkoviky landslide in Czech Republic. Landslides, 17(3), 597-614. https://doi.org/10.1007/s10346-019-01306-4.

16. Hongze, Z., Dongyu, W., Ming, M., & Kaihui, Z. (2020). Parameter inversion and location determination of evolutionary weak layer for open-pit mine slope. International Journal of Coal Science & Technology, 7(4), 714-724. https://doi.org/10.1007/s40789-020-00337-w.

17. Wei,Y., Hanhua,T., Jiandong,N., Wei,W., & Xiaoyun,S. (2020). A new criterion for defining the failure of a fractured rock mass slope based on the strength reduction method. Geomatics, Natural Hazards and Risk, 11(1), 1849-1863.

18. Sdvyzhkova,O., Babets,D., Moldabayev,S., Rysbekov,K., & Sarybayev,M. (2020). Mathematical modeling a stochastic variation of rock properties at an excavation design. International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM, 165-172. https://doi.org/10.5593/sgem2020/1.2/s03.021.

19. Shcherbakov,P., Sarybayev,N., Tymchenko,S., Moldabayev,S., & Bitimbayev,M. (2021). Mathematical model to optimize drilling-and-blasting operations in the process of open-pit hard rock mining. Mining of Mineral Deposits, 15(2), 25-34. https://doi.org/10.33271/mining15.02.025.

20. Makowski,P.,Niedbalski,Z., &Balarabe,T. (2021). Correction to:A statistical analysis of geomechanical data and its effect on rock mass numerical modeling: a case study. International Journal of Coal Science and Technology, 8(3), 457-458. https://doi.org/10.1007/s40789-020-00378-1.

 

Visitors

4915362
Today
This Month
All days
11612
42053
4915362

Guest Book

If you have questions, comments or suggestions, you can write them in our "Guest Book"

Registration data

ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

Contacts

D.Yavornytskyi ave.,19, pavilion 3, room 24-а, Dnipro, 49005
Tel.: +38 (056) 746 32 79.
e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
You are here: Home Archive by issue 2021 Content №6 2021 Numerical simulation of the open pit stability based on probabilistic approach