Analysis of the Validated Transition Failure Criterion Model for Slope Stability in the Final Wall of a High-Sulphidation Epithermal Open-Pit Mine

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Published: Nov 30, 2025
DOI: https://doi.org/10.55981/eksplorium.2025.11404
Keywords:
Slope Stability, Validated Transition Criterion, Finite Element Method (FEM), Rock Mass Strength Classification, Generalized Hoek-Brown Criterion

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M Alfiza Farhan
Department of Mining Engineering, Faculty of Engineering and Design, Institut Teknologi Sains Bandung
Akbar Aprian
Department of Mining Engineering, Faculty of Production and Industry Technology, Institut Teknologi Sumatera

Abstract

Open-pit slope stability in hydrothermally altered and clay-rich settings remains a critical challenge in geotechnical design. Conventional criteria, such as the Mohr–Coulomb and Generalized Hoek–Brown (GHB) models, often fail to accurately represent the intermediate soil–rock behavior of transition materials. This study applies and validates the Validated Transition (VT) criterion, a refinement of the GHB model, within a Finite Element Method (FEM) framework to evaluate slope stability in the final wall of a high-sulphidation epithermal open-pit mine. Transition rock properties were derived from Point Load Index (PLI) correlations with Uniaxial Compressive Strength (UCS), ensuring a representative characterization of hydrothermal clay-altered lithologies. Numerical simulations were performed to compare slope responses under the VT, GHB, and Mohr–Coulomb (MC) formulations. Results show that the VT model provides the highest consistency with radar-monitored displacements, achieving up to 93% agreement in low- to medium-strength rock masses, while GHB and MC produced lower correlations. This demonstrates that the VT model more effectively captures the deformation behavior of transitional rock masses, improving predictive reliability over conventional approaches. Beyond the studied case, the VT–FEM approach establishes a methodological framework that can be extended to other open-pit mines with similar geomechanical conditions. The findings emphasize the importance of transition material-specific failure criteria, supporting optimized pit design and cost-effective wall management aligned with safety standards.

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How to Cite
Farhan, M. A., & Aprian, A. (2025). Analysis of the Validated Transition Failure Criterion Model for Slope Stability in the Final Wall of a High-Sulphidation Epithermal Open-Pit Mine. EKSPLORIUM, 46(2), 69–82. https://doi.org/10.55981/eksplorium.2025.11404
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Vol. 46 No. 2 (2025): NOVEMBER 2025
Section
Articles
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References

[1] E. Alemayehu, E. T. Chala, N. Z. Jilo, T. Tiyasha, and B. Moges, "Optimizing design and stability of open pit slopes in Tolay coal mine, Ethiopia," Scientific Reports, vol. 15, 1570, 2025, doi: https://doi.org/10.1038/s41598-025-86034-7.

[2] E. Hoek and E. T. Brown, "Practical Estimates of Rock Mass Strength", International Journal of Rock Mechanics and Mining Sciences, vol. 39, no.7, pp. 877–912, 2002.

[3] R. Ulusay and J. A. Hudson, The complete ISRM suggested methods for rock characterization, testing and monitoring: 1974–2006, Ankara, Turkey: ISRM Turkish National Group, 2007.

[4] E. Hoek and E. T. Brown, "Practical estimates of rock mass strength," International Journal of Rock Mechanics and Mining Sciences, vol. 34, no. 8, pp. 1165–1186, 1997.

[5] J. Hou, P. Zhang, N. Gao, W. Yan, and Q. Yu, "Freeze–thaw-induced degradation mechanisms and slope stability of filled fractured rock masses in cold region open-pit mines," Applied Sciences, vol. 15, no. 13, pp. 7429, 2025, doi: https://doi.org/10.3390/app15137429.

[6] E. Hoek and E. T. Brown, "The Hoek–Brown failure criterion and GSI – 2018 edition", Journal of Rock Mechanics and Geotechnical Engineering, vol. 10 no. 4, pp. 477–489, 2018.

[7] O. S. Dinc, H. Sonmez, C. Tunusluoglu, and K. E. Kasapoglu, "A New General Empirical Approach for Prediction of Rock Mass Strength of Soft to Hard Rock Masses", International Journal of Rock Mechanics and Mining Sciences, vol. 48, no.2, pp. 650-665, 2011, doi: https://doi.org/10.1016/j.ijrmms.2011.03.001.

[8] H. Zhai, I. Canbulat, B. Hebblewhite, and C. Zhang, "Review of Current Empirical Approaches for Determination of the Weak rock Mass Properties", Symposium of the International Society for Rock Mechanics, vol. 191, 2017, doi: https://doi.org/10.1016/j.proeng.2017.05.261.

[9] A. Karzulovic and J. Read, Rock Mass Model, in: Guidelines for Open Pit Slope Design: J. Read and P. Stacey (Ed.), CSIRO Publishing, Australia, 83-84, 2009.

[10] B. M. Das and K. Sobhan, Principles of Geotechnical Engineering (8th ed.), Cengage Learning, p. 156, 2015.

[11] D. V. Griffiths, "Failure Criteria Interpretation Based on Mohr–Coulomb Friction," Journal of Geotechnical Engineering, vol. 116, no. 6, pp. 986–1001, 1990, doi: https://doi.org/10.1061/(ASCE)0733-9410(1990)116:6(986).

[12] N. Abbas, K. Li, L. Wang, Y. Fissha, K. S. Shah, and T. Saidani, "Evaluating Mohr–Coulomb and Hoek–Brown strength criteria for rock masses using probabilistic assessment," Geofluids, 2025, 3682700, p. 18, doi: https://doi.org/10.1155/gfl/3682700.

[13] B. Vásárhelyi, S. Narimani, S. M. Davarpanah, and G. Mocsár, "Modeling brittle-to-ductile transitions in rock masses: Integrating the geological strength index with the Hoek–Brown criterion," Applied Mechanics, vol. 5, no. 4, pp. 634–645, 2024, doi: https://doi.org/10.3390/applmech5040036.

[14] T. G. Carter, M. S. Diederichs, and J. L. Carvalho, "Application of Modified Hoek-Brown Transition Relationships for Assessing Strength and Post Yield Behavior at Both Ends of The Rock Competence Scale", The Journal of The Southern African Institute of Mining and Metallurgy, South Africa, 2008.

[15] E. T. Brown, "Estimating the Mechanical Properties of Rock Masses," Proceedings of the 1st Southern Hemisphere International Rock Mechanics Symposium, Australian Centre for Geomechanics, Perth, Australia, pp. 3-22, 2008, doi: https://doi.org/10.36487/ACG_repo/808_16.

[16] J. L. Carvalho, T. G. Carter, and M. S. Deiderichs, "An Approach for Prediction of Strength and Post Yield Behavior for Rock Masses of Low Intact Strength," in: Rock Mechanics Meeting Society's Challenges and Demands Volume 1, Proceedings of the 1st Canada-US Rock Mechanics Symposium, Canada, pp. 277 – 285 2007.

[17] X. Wei, J. Zuo, Y. Shi, H. Liu, Y. Jiang, and C. Liu, "Experimental verification of parameter m in Hoek–Brown failure criterion considering the effects of natural fractures," Journal of Rock Mechanics and Geotechnical Engineering, vol. 12, no. 5, pp. 1036–1045, 2020, doi: https://doi.org/10.1016/j.jrmge.2020.01.006.

[18] D. P. Waskita, A. Febriadi, R. Rampan, H. Oktavianto, & N. Patmo, "Slope stability analysis of weak rock using the validated transition material model in the 2020 Pit Wara design, PT Adaro Indonesia", Proceedings of the 29th Indonesian Mining Professionals Association (PERHAPI) Conference, Department of Geotechnical & Hydrogeology, PT Adaro Indonesia, 2020.

[19] S. Sutarto, S. Sutanto, P. Khafarel Lauda, L. R. Kenny, P. Rigenaji, L. Cicih, and P. Hidayat, ”Karakteristik Breksi Hidrotermal Prospek Tumpang Pitu”, Lembaga Penelitian dan Pengabdian kepada Masyarakat, Universitas Pembangunan Nasional “Veteran” Yogyakarta, 2020.

[20] H. Zhai, I. Canbulat, M. Zoorabadi, B. Hebblewhite, and C. Zhang, "A Validation of Current Rock Mass Property Determination Methods for Coal Measure Rocks," 52nd US Rock Mechanics/Geomechanics Symposium, American Rock Mechanics Association, USA, 2018.

[21] A. N. Muchamad, B. Y. Alam, and E. Tintin Yuningsih, "Groundwater Hydrogeochemistry in Coastal Areas: A Case Study of the Katak Lowland, Sumber Agung Village, Banyuwangi Regency", Riset Geologi dan Pertambangan, vol. 27, no. 1, pp. 39-46, 2017, doi: http://dx.doi.org/10.14203/risetgeotam2017.v27.442.

[22] M. Kohno and H. Maeda, "Relationship between Point Load Strength Index and Uniaxial Compressive Strength of Hydrothermally Altered Soft Rocks", International Journal of Rock Mechanics and Mining Sciences, vol. 50, pp. 147-157, 2012, doi: https://doi.org/10.1016/j.ijrmms. 2012.01.011.

[23] E. Broch and J. A. Franklin, "The Point-Load Strength Test", International Journal of Rock Mechanics and Mining Sciences, vol. 9, pp. 669-697, 1972.

[24] Z. T. Bieniawski, "The point-load test in geotechnical practice," Engineering Geology, vol. 9, no. 1, pp. 1–11, 1975.

[25] J. S. Van der Schrier,"The block punch index test", Bulletin of the International Association of Engineering Geology, vol. 38, pp. 121–126, 1988.