Slope stability analysis of Sefidabeh antimony open-pit walls

نوع مقاله : مقاله پژوهشی

نویسندگان

Asistant professor of Mining Engineering Department, Faculty of Engineering, University of Sistan And Baluchestan

10.22034/anm.2026.23678.1698

چکیده

In this study, the wall slope stability of the Sefidabeh antimony open-pit mine has been investigated. According to the geometry of the mining pit, three areas of the northern, middle, and southern pits have been considered, and each of them has been divided into the walls of the eastern, western, northern, and southern walls (A total of 8 walls have been examined). The geometric and mechanical characteristics of more than 500 rock joints have been surveyed in the entire mining pit area. Then, using the surveyed characteristics of the rock mass, the SMR rating of each wall was calculated, and the required stabilization measures were proposed based on it. Based on the results of the SMR rating, the walls of the middle pits and the eastern walls of the northern and southern pits need local improvement. Then, the rock mass of the walls was modeled and analyzed using FLAC 2D software. Based on the modeling results, the safety factor of all walls was found to be between 2.78 and 4.88, which, considering a minimum safety factor of 1.3 for the stability of the walls, indicates that all the mine walls are currently stable. Finally, assuming a GSI = 50, the lowest geological strength index surveyed from the walls, a sensitivity analysis of the slopes was performed with respect to changes in the overall slope angle, the height of the walls (mine depth), and changes in the compressive strength of the rocks. The results are presented in the form of graphs.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Slope stability analysis of Sefidabeh antimony open-pit walls

نویسندگان [English]

  • Mohamad Javad Azinfar
  • Seyed Amirasad Fatemi
  • Soheil Zaremotlagh
Asistant professor of Mining Engineering Department, Faculty of Engineering, University of Sistan And Baluchestan
چکیده [English]

In this study, the wall slope stability of the Sefidabeh antimony open-pit mine has been investigated. According to the geometry of the mining pit, three areas of the northern, middle, and southern pits have been considered, and each of them has been divided into the walls of the eastern, western, northern, and southern walls (A total of 8 walls have been examined). The geometric and mechanical characteristics of more than 500 rock joints have been surveyed in the entire mining pit area. Then, using the surveyed characteristics of the rock mass, the SMR rating of each wall was calculated, and the required stabilization measures were proposed based on it. Based on the results of the SMR rating, the walls of the middle pits and the eastern walls of the northern and southern pits need local improvement. Then, the rock mass of the walls was modeled and analyzed using FLAC 2D software. Based on the modeling results, the safety factor of all walls was found to be between 2.78 and 4.88, which, considering a minimum safety factor of 1.3 for the stability of the walls, indicates that all the mine walls are currently stable. Finally, assuming a GSI = 50, the lowest geological strength index surveyed from the walls, a sensitivity analysis of the slopes was performed with respect to changes in the overall slope angle, the height of the walls (mine depth), and changes in the compressive strength of the rocks. The results are presented in the form of graphs.

کلیدواژه‌ها [English]

  • Sefidabeh antimony mine
  • FLAC 2D
  • SMR
  • Open-pit mine slope design
  • Geotechnical modeling
  • Rock mass characterization

مراجع

[1]       Program for preparing mining standards and criteria - Ministry of Industries and Mines, Guidelines for analyzing and stabilizing slopes in open-pit mines, Deputy for Strategic Supervision of Technical System Affairs, Ministry of Industries and Mines. 2010 [In Persian].
[2]       Bieniawski, Z.T., (1989), Engineering rock mass classifications: a complete manual for engineers and geologists in mining, civil, and petroleum engineering: New York, Wiley, xii, 251 p. p.
[3]       Romana M., (1985). New adjustment ratings for application of Bieniawski classification to slopes, in: Proceedings of the International Symposium on the Role of Rock Mechanics in Excavations for Mining and Civil Works. International Society of Rock Mechanics, Zacatecas, pp. 49-53.
[4]       Aghanabati, S.A., 1991. Geological map of Kuh-e-Seyasteragi (1:100000). Geological survey Of Iran.
[5]       Bomari, M., Bagheri, S., Biyabangard, H., Ghodsi, M. R., (2021). Antimony mineralization controllers and its exploration routes in Sefidaba and Heydarabad and adjacent areas, Sistan Seam Zone, Sistan and Baluchestan Province, Sistan and Baluchestan University research project. 500 p. [In Persian]
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[11]   Bieniawski, Z. T. (1989). Engineering rock mass classifications: a complete manual for engineers and geologists in mining, civil, and petroleum engineering. John Wiley & Sons.
[12]   Hoek, E., Carranza-Torres, C., Corkum, B., (2002), HOEK-BROWN FAILURE CRITERION – 2002 EDITION, Proceeding of the fifth North American Rock Mechanics Symposium, University of Toronto.
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[15]   Vásárhelyi, B. (2009) "A possible method for estimating the Poisson's rate values of the rock masses", Acta Geodaetica et Geophysica Hungarica, 44(3), pp. 313–322.
[16]   Wyllie, D. C., & Mah, C. (2004). Rock slope engineering. CRC Press. 4th edition.
[17]   Salu, S. P., & Bima, B. (2024). Impact Of Open-pit Mining Expansion on Slope Stability at Pt. Hikari Jeindo, Langgikima, North Konawe, Indonesia. Journal of Mining and Environment, 15(3), 943-959.”
[18]   Jing, L., & Hudson, J. A. (2002). Numerical methods in rock mechanics. International Journal of Rock Mechanics and Mining Sciences, 39(4), 409-427.
[19]   Xia, L., Zheng, Y., & Yu, Q. (2016). Estimation of the REV size for blockiness of fractured rock masses. Computers and Geotechnics, 76, 83-92.

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سابقه مقاله

  • تاریخ دریافت: 26 شهریور 1404
  • تاریخ بازنگری: 01 آذر 1404
  • تاریخ پذیرش: 23 دی 1404

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