Stability analysis in 4th Gol-e-Gohar Mine with residual parameters method and strain softening approach

نوع مقاله : مقاله پژوهشی

نویسندگان

Dept. of mining Engineering, University of Tehran, Tehran, Iran

چکیده

Today, numerous surface and underground mining and construction projects can be found worldwide, built on a rock bed and surrounded by rock. Open pit mines are considered the primary sector for mineral production in the mining industry. The issue of slope stability is crucial for the economy and safety of open pit mines. Slope stability should be based on the determination of tectonic and lithological parameters and the determination of mine boundaries. It is illogical to allocate one slope for the entire walls of the mine, which are made of different materials and have different structural conditions. The purpose of slope stability analysis is to maintain a stable slope while mining activities continue. This research was conducted on slope stability analysis in the No. 4 Gol-e-Gohar mine in Sirjan. Geotechnical characteristics and necessary information for numerical modeling were obtained through mine visits, surveys, and tests on rock samples from exploratory boreholes. Based on two-dimensional modeling using PHASE 2D software, the CSFH behavior model (cohesion softening - friction hardening) for the northern wall will enhance the overall strength of the rock mass. However, this behavior model is not suitable for medium and weak-quality rocks. For rocks with softening behavior, the CSFS behavior model (cohesion softening - friction softening) provides more realistic results. Furthermore, to investigate the effect of schistosity plates, transisotropic behavior parameters were determined based on direct cutting tests on schistosity surfaces, and stability analysis was conducted. It was concluded that the orientation of the Turq surfaces in schist layers has a significant effect on the strength of these layers, leading to larger displacement values than other models.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Stability analysis in 4th Gol-e-Gohar Mine with residual parameters method and strain softening approach

نویسندگان [English]

  • Afshar Amiri
  • mehdi moosavi
  • Ali Reza Kargar
Dept. of mining Engineering, University of Tehran, Tehran, Iran
چکیده [English]

Today, numerous surface and underground mining and construction projects can be found worldwide, built on a rock bed and surrounded by rock. Open pit mines are considered the primary sector for mineral production in the mining industry. The issue of slope stability is crucial for the economy and safety of open pit mines. Slope stability should be based on the determination of tectonic and lithological parameters and the determination of mine boundaries. It is illogical to allocate one slope for the entire walls of the mine, which are made of different materials and have different structural conditions. The purpose of slope stability analysis is to maintain a stable slope while mining activities continue. This research was conducted on slope stability analysis in the No. 4 Gol-e-Gohar mine in Sirjan. Geotechnical characteristics and necessary information for numerical modeling were obtained through mine visits, surveys, and tests on rock samples from exploratory boreholes. Based on two-dimensional modeling using PHASE 2D software, the CSFH behavior model (cohesion softening - friction hardening) for the northern wall will enhance the overall strength of the rock mass. However, this behavior model is not suitable for medium and weak-quality rocks. For rocks with softening behavior, the CSFS behavior model (cohesion softening - friction softening) provides more realistic results. Furthermore, to investigate the effect of schistosity plates, transisotropic behavior parameters were determined based on direct cutting tests on schistosity surfaces, and stability analysis was conducted. It was concluded that the orientation of the Turq surfaces in schist layers has a significant effect on the strength of these layers, leading to larger displacement values than other models.

کلیدواژه‌ها [English]

  • Slope Stability
  • Numerical Modeling
  • Residual Parameters
  • Geotechnic
  • Gol-e-Gohar Mine

مراجع

[1]       Duncan, C., & MahCh, W. (2005). Rock Slope Engineering.4th edition. London and NewYork: Spon Press.
[2]       Cai, M., Kaiser, P., Uno, H., Tasaka, Y., & Minami, M. (2004). Estimation of Rock Mass Deformation Modulus of Strength of Jointed Hard Rock Masses Using the GSI System. International Journal of Rock Mechanics and Mining Sciences, 3-19.
[3]       Cai, M., Kaiser, P., Tasaka, Y., & Minami, M. (2007). Determination of Residual Strength Parameters of Jointed Rock Masses Using the Gsi System. International Journal of Rock Mechanics and Mining Sciences, 247-265.
[4]       Hoek, E., Marinos, P., & Benissi, M. (1999). Applicability of the Geological Strength Index (GSI) Classification for Weak and Sheared Rock Masses. Bulletin of Engineering Geology and the Environment, 151-160.
[5]       Russo, G., Kalamaras, G., & Grasso, P. (1998). A Discussion on the Concepts of Geomechanical Classes Behavior Categories and Technical Classes for an Underground Project. Gallerie e Grandi Opere Sotterranee.
[6]       Ribacchi, R. (2000). Mechanical Tests on Pervasively Jointed Rock Material: Insight into Rock Mass Behavior. Rock Mech and Rock Eng, 243-266.
[7]       Hoek, E., & Brown, E. (1997). Practical Estimates of Rock Mass Strength. International Journal of Rock Mechanics and Mining Sciences, 65-87.
[8]       Alejano, L., Rodriguez-Dono, A., Alonso, E., & Fdez.-Manín, G. (2009). round Reaction Curves for Tunnels Excavated in Different Quality Rock Masses Showing Several Types of Post-Failure Behaviour. unnelling and Underground Space Technology, 1-17.
[9]       Hoek, E., & Diederichs, M. (2006). Empirical Estimation of Rock Mass Modulus. International Journal of Rock Mechanics and Mining Sciences, 203-215.
[10]    Schmertmann, J., & Osterberg, J. (1960). An experimental study of the development of cohesion and friction with axial strain in saturated cohesive soils. Research conference on shear strength of cohesive soils (pp. 643-694). ASCE.
[11]    Hajiabdolmajid, V., Kaiser, P., & Martin, C. (2003). Mobilised Strength Components in Brittle Failure of Rock. International Journal of Geotechnique, 327-336.
[12]    Brady, B., & Brown, E. (1985). Rock Mechanics for Undergroung Mining. Third Edition. KELUWER Academic Publishers.
[13]    Naseri, M., & Ramamurthy, k. (1997). Failure Mechanism in Schistose Rocks. International Journal of Rock Mechanics and Mining Sciences, 219-234.
[14]    Mohjel, M., & Sehandi, M. (1387). Techtonic Evolution of Sanandaj - Sirjan Zone and Introduction of new Sub-Zones in it. Journal of Earth Science, 28-49. (In Persian).
[15]    Rocscience. (2008). Phase2D. Version 8.0. Toronto, Canada.
[16]    Rocscience. (2004). Rocklab. Version 4.0. Toronto, Canada.
[17]    Iranian Mines and Mining Industries & Development and Renovation (IMIDRO). (2022). Report of Structural Geology and Tectonics of the Gol-e-Gohar Mine No.4.Report No: IO1O-M-MI-999-GER-AA. (In Persian).
[18]    Hoek, E., Carranza-Torres, C, T., & Corkum, B. (2002). Hoek - Brown failure criterion-2002 edition. Proceeding  of the Fifth North American Sysmposium, University of Toronto Press, Toronto, 267-273.

فایل ها

سابقه مقاله

  • تاریخ دریافت: 11 بهمن 1401
  • تاریخ بازنگری: 20 شهریور 1402
  • تاریخ پذیرش: 14 آبان 1402

هم رسانی

ارجاع به این مقاله

آمار