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http://dx.doi.org/10.12989/gae.2018.15.1.669

Numerical analysis of a complex slope instability: Pseudo-wedge failure  

Babanouri, Nima (Department of Mining Engineering, Hamedan University of Technology)
Sarfarazi, Vahab (Department of Mining Engineering, Hamedan University of Technology)
Publication Information
Geomechanics and Engineering / v.15, no.1, 2018 , pp. 669-676 More about this Journal
Abstract
The "pseudo-wedge" failure is a name for a complex instability occurring at the Sarcheshmeh open-pit mine (Iran). The pseudo-wedge failure contains both the rock bridge failure and sliding along pre-existing discontinuities. In this paper, a cross section of the failure area was first modeled using a bonded-particle method. The results indicated development of tensile cracks at the slope toe which explains the freedom of pseudo-wedge blocks to slide. Then, a three-dimensional discrete element method was used to perform a block analysis of the instability. The technique of shear strength reduction was used to calculate the factor of safety. Finally, the influence of geometrical characteristics of the mine wall on the pseudo-wedge failure was investigated. The safety factor significantly increases as the dip and dip direction of the wall decrease, and reaches an acceptable value with a 10-degree decrease of them.
Keywords
pseudo-wedge failure; bonded-particle model; rock bridge failure; discrete element method; slope stability;
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Times Cited By KSCI : 4  (Citation Analysis)
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1 Ghazvinian, A., Sarfarazi, V., Schubert, W. and Blumel, M. (2012), "A study of the failure mechanism of planar non-persistent open joints using PFC2D", Rock Mech. Rock Eng., 45(5), 677-693.   DOI
2 Goodman, R.E., Heuze, F.E. and Ohnishi, Y. (1972), "Research on strength, deformability, water pressure relationship for fault in direct shear", University of California, Berkeley, Berkeley, California, U.S.A.
3 Hart, R., Cundall, P.A. and Lemos, J. (1988), "Formulation of a three-dimensional distinct element model-Part II. Mechanical calculations for motion and interaction of a system composed of many polyhedral blocks", J. Rock Mech. Min. Sci. Geomech. Abstr., 25, 117-125.
4 Huang, D., Cen, D., Ma, G. and Huang, R. (2015), "Step-path failure of rock slopes with intermittent joints", Landslides, 12(5), 911-926.   DOI
5 Indraratna, B., Premadasa, W., Brown, E.T., Gens, A. and Heitor, A. (2014), "Shear strength of rock joints influenced by compacted infill", J. Rock Mech. Min. Sci., 70, 296-307.
6 ISRM. (1978), "Suggested methods for determining tensile strength of rock materials", J. Rock Mech. Min. Sci. Geomech. Abstr., 15(3), 99-103.   DOI
7 Itasca Consulting Group Inc. (1999a), 3DEC User's Guide, Minneapolis, Minnesota, U.S.A.
8 Stacey, T.R. (1970), "The stresses surrounding open-pit mine slopes", Plan. Open Pit Mines, 199-207.
9 Itasca Consulting Group Inc. (1999b), Particle Flow Code in 2 Dimensions (PFC2D) Version 3.10 User's Manual, Minneapolis, Minnesota, U.S.A.
10 Jiang, Q., Qi, Z., Wei, W. and Zhou, C. (2015), "Stability assessment of a high rock slope by strength reduction finite element method", Bull. Eng. Geol. Environ., 74(4), 1153-1162.   DOI
11 Kanungo, D.P., Pain, A. and Sharma, S. (2013), "Finite element modeling approach to assess the stability of debris and rock slopes: A case study from the Indian Himalayas", Nat. Hazards, 69(1), 1-24.   DOI
12 Karimi Nasab, S. (2001), "Remedial measures for Sarcheshmeh pseudowedge failure", Proceedings of the 1st Iranian Rock Mechanics Conference, Tehran, Iran, January.
13 Khosravi, A., Serej, A.D., Mousavi, S.M. and Haeri, S.M. (2016), "Effect of hydraulic hysteresis and degree of saturation of infill materials on the behavior of an infilled rock fracture", J. Rock Mech. Min. Sci., 88, 105-114.
14 Latha, G.M. and Garaga, A. (2010), "Stability analysis of a rock slope in Himalayas", Geomech. Eng., 2(2), 125-140.   DOI
15 Lombardi, M., Cardarilli, M. and Raspa, G. (2017), "Spatial variability analysis of soil strength to slope stability assessment", Geomech. Eng., 12(3), 483-503.   DOI
16 Pain, A., Kanungo, D.P. and Sarkar, S. (2014), "Rock slope stability assessment using finite element based modellingexamples from the Indian Himalayas", Geomech. Eng., 9(3), 215-230.
17 Babanouri, N. and Dehghani, H. (2017), "Investigating a potential reservoir landslide and suggesting its treatment using limit-equilibrium and numerical methods", J. Mountain Sci., 14(3), 432-441.   DOI
18 Babanouri, N., Mansouri, H., Nasab, S.K. and Bahaadini, M. (2013), "A coupled method to study blast wave propagation in fractured rock masses and estimate unknown properties", Comput. Geotech., 49, 134-142.   DOI
19 Zheng, H., Liu, F.D. and Li, G.C. (2007), "On the assessment of failure in slope stability analysis by the finite element method", Rock Mech. Rock Eng., 41(4), 629-639.   DOI
20 Blake, W. (1968), "Finite element model study of slope modification at the Kimbley pit", Soc. Min. Eng. AIME, 241, 525-532.
21 Panahi, M., Afsarinejad, M., Jalalifar, H. and Karimi Nasab, S. (2001), "Discontinuity information processing in slope stability in Sarcheshmeh copper mine", Proceedings of the 1st Conference of Iran Open Pit Mines, Kerman, Iran, October.
22 Potyondy, D.O. and Cundall, P.A. (2004), "A bonded-particle model for rock", J. Rock Mech. Min. Sci., 41(8), 1329-1364.   DOI
23 Sarfarazi, V., Ghazvinian, A., Schubert, W., Blumel, M. and Nejati, H.R. (2014), "Numerical simulation of the process of fracture of echelon rock joints", Rock Mech. Rock Eng., 47(4), 1355-1371.   DOI
24 Waterman, G.C. and Hamilton, R.L. (1975), "The Sar Cheshmeh porphyry copper deposit", Econ. Geol., 70(3), 568-576.   DOI
25 Stead, D., Eberhardt, E. and Coggan, J.S. (2006), "Developments in the characterization of complex rock slope deformation and failure using numerical modelling techniques", Eng. Geol., 83(1), 217-235.   DOI
26 Tiwari, G. and Latha, G.M. (2016), "Design of rock slope reinforcement: An Himalayan case study", Rock Mech. Rock Eng., 49(6), 2075-2097.   DOI
27 Wang, S., Huang, R., Ni, P. and Jeon, S. (2017), "Advanced discretization of rock slope using block theory within the framework of discontinuous deformation analysis", Geomech. Eng., 12(4), 723-738.   DOI
28 Wyllie, D.C. and Mah, C. (2004). Rock Slope Engineering: Civil and Mining, CRC Press.
29 Shahabpour, J. (1982), "Aspects of alteration and mineralization at the Sar-Cheshmeh copper-molybdenum deposit", Ph.D. Dissertation, University of Leeds, Leeds, West Yorkshire, U.K.
30 Scholtes, L. and Donze, F.V. (2015), "A DEM analysis of step-path failure in jointed rock slopes", Comptes Rendus Mecanique, 343(2), 155-165.   DOI
31 Shamekhi, E. and Tannant, D.D. (2015), "Probabilistic assessment of rock slope stability using response surfaces determined from finite element models of geometric realizations", Comput. Geotech., 69, 70-81.   DOI
32 Yoon, J. (2007), "Application of experimental design and optimization to PFC model calibration in uniaxial compression simulation", J. Rock Mech. Min. Sci., 44(6), 871-889.   DOI
33 Shi, C., Li, D., Chen, K. and Zhou, J. (2016), "Failure mechanism and stability analysis of the Zhenggang landslide in Yunnan Province of China using 3D particle flow code simulation", J. Mountain Sci., 13(5), 891-905.   DOI
34 Sjoberg, J. (1999), "Analysis of large scale rock slopes", Ph.D. Dissertation, Lulea University of Technology, Lulea, Sweden.
35 Cundall, P.A. and Strack, O.D.L. (1979), "A discrete numerical model for granular assemblies", Geotechnique, 29(1), 47-65.   DOI
36 Bonilla-Sierra, V., Scholtes, L., Donze, F. and Elmouttie, M. (2015), "DEM analysis of rock bridges and the contribution to rock slope stability in the case of translational sliding failures", J. Rock Mech. Min. Sci., 80, 67-78.
37 Corkum, A.G. and Martin, C.D. (2004), "Analysis of a rock slide stabilized with a toe-berm: A case study in British Columbia, Canada", J. Rock Mech. Min. Sci., 41(7), 1109-1121.
38 Cundall, P.A. (1988), "Formulation of a three-dimensional distinct element model-Part I. A scheme to detect and represent contacts in a system composed of many polyhedral blocks", J. Rock Mech. Min. Sci. Geomech. Abstr., 25(3), 107-116.
39 Agliardi, F., Crosta, G.B., Meloni, F., Valle, C. and Rivolta, C. (2013), "Structurally-controlled instability, damage and slope failure in a porphyry rock mass", Tectonophys., 605, 34-47.   DOI
40 Amuzesh, M., Karimi Nasab, S., Atashpanjeh, A. and Babaie, B. (2004), "Stability analysis of the Sarcheshmeh pseudowedge failure based on the Hoek and Brown criteria", Proceedings of the 2nd Iranian Rock Mechanics Conference, Tehran, Iran, December.
41 Cundall, P.A. and Strack, O.D.L. (1999), Particle Flow Code in 2 Dimensions, Itasca Consulting Group Inc.
42 Dawson, E.M., Roth, W.H. and Drescher, A. (1999), "Slope stability analysis by strength reduction", Geotechnique, 49(6), 835-840.   DOI
43 Gao, Y., Wu, D., Zhang, F., Lei, G.H., Qin, H. and Qiu, Y. (2016), "Limit analysis of 3D rock slope stability with non-linear failure criterion", Geomech. Eng., 10(1), 59-76.   DOI
44 Eberhardt, E., Stead, D. and Coggan, J.S. (2004), "Numerical analysis of initiation and progressive failure in natural rock slopes-the 1991 Randa rockslide", J. Rock Mech. Min. Sci., 41(1), 69-87.   DOI
45 Garcia Lopez-Davalillo, J.C., Monod, B., Alvarez-Fernandez, M.I., Herrera Garcia, G., Darrozes, J., Gonzalez-Nicieza, C. and Olivier, M. (2014), "Morphology and causes of landslides in Portalet area (Spanish Pyrenees): Probabilistic analysis by means of numerical modelling", Eng. Fail. Anal., 36, 390-406.   DOI
46 Faramarzi, L., Zare, M., Azhari, A. and Tabaei, M. (2016), "Assessment of rock slope stability at Cham-Shir Dam Power Plant pit using the limit equilibrium method and numerical modeling", Bull. Eng. Geol. Environ., 76(2), 783-794.
47 Fereidooni, D. (2017), "Influence of discontinuities and clay minerals in their filling materials on the instability of rock slopes", Geomech. Geoeng., 13(1), 11-21.