Numerical Modelling of Slide-Head-Toppling Failure using FEM and DEM Methods | ||
| Journal of Mining and Environment | ||
| مقاله 18، دوره 13، شماره 1، فروردین 2022، صفحه 269-280 اصل مقاله (6.59 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22044/jme.2022.11698.2159 | ||
| نویسندگان | ||
| H. Sarfaraz* ؛ A.R. Bahrami؛ R. Samani | ||
| School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| چکیده | ||
| A common instability in the rock slopes is a toppling failure. If this type of slope failure occurs due to another kind of failure, it is considered as the secondary toppling failure. A type of secondary toppling failure is the slide-head-toppling failure. In this instability, the upper portion of the slope is toppled, and the pressure caused by the overturning of rock blocks leads to a semi-circular sliding in the soil mass at the slope toe. This instability is examined through the theoretical analysis and physical modelling. Firstly, the failure mechanism mentioned above is described. Next, the slide-head-toppling failure is studied through seven numerical simulations. The Phase2 and UDEC softwares, as the finite element and distinct element methods, respectively, are used in this work. Different kinds of slide-head-toppling failure are modelled such as the blocky, block-flexural, and flexural toppling failures. The numerical modelling results are compared with the existing physical tests and theoretical approaches. This comparison illustrates that the safety factor is underestimated due to the plane strain supposition in numerical modelling. However, the side-friction in the physical models has violated this assumption. The results obtained demonstrate that the distinct element method has an acceptable accuracy compared to the finite element method. Thus this numerical code can be used in order to examine the mentioned failure. | ||
| کلیدواژهها | ||
| Rock Slopes؛ Slide-Head-Toppling؛ Numerical Simulation؛ DEM and FEM Methods | ||
| مراجع | ||
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[1]. Wyllie, D.C. and Mah, C. (2004). Rock slope engineering. CRC Press.
[2]. Adhikary, D.P., Dyskin, A.V., Jewell, R.J. and Stewart, D.P. (1997). A study of the mechanism of flexural toppling failure of rock slopes. Rock mechanics and rock engineering. 30 (2): 75-93.
[3]. Adhikary, D.P. and Dyskin, A.V. (2007). Modelling of progressive and instantaneous failures of foliated rock slopes. Rock Mechanics and Rock Engineering. 40 (4): 349-362.
[4]. Cundall, P.A. (1971). A computer model for simulating progressive, large-scale movement in blocky rock system. In Proceedings of the International Symposium on Rock Mechanics, 1971.
[5]. Pritchard, M.A. and Savigny, K.W. (1990). Numerical modelling of toppling. Canadian Geotechnical Journal. 27 (6): 823-834.
[6]. Alzo’ubi, A.K., Martin, C.D. and Cruden, D.M. (2010). Influence of tensile strength on toppling failure in centrifuge tests. International Journal of Rock Mechanics and Mining Sciences. 47 (6): 974-982.
[7]. Majdi, A. and Amini, M. (2011). Analysis of geo-structural defects in flexural toppling failure. International Journal of Rock Mechanics and Mining Sciences. 48 (2): 175-186.
[8]. Amini, M., Majdi, A. and Aydan, Ö. (2009). Stability analysis and the stabilisation of flexural toppling failure. Rock Mechanics and Rock Engineering. 42 (5): 751-782.
[9]. Sarfaraz, H. (2020). Stability analysis of flexural toppling failure using the Sarma’s method. Geotechnical and Geological Engineering. 38 (4): 3667-3682.
[10]. Aydan, Ö. and Kawamoto, T. (1992). The stability of slopes and underground openings against flexural toppling and their stabilisation. Rock Mechanics and Rock Engineering. 25 (3): 143-165.
[11]. Sarfaraz, H. (2021). An Analytical Solution for Analysis of Block Toppling Failure Using Approach of Fictitious Horizontal Acceleration. Journal of Mining Science. 57 (2): 202-209.
[12]. Amini, M., Majdi, A. and Veshadi, M.A. (2012). Stability analysis of rock slopes against block-flexure toppling failure. Rock Mechanics and Rock Engineering. 45 (4): 519-532.
[13]. Zheng, Y., Chen, C., Liu, T., Xia, K. and Liu, X. (2018). Stability analysis of rock slopes against sliding or flexural-toppling failure. Bulletin of Engineering Geology and the Environment. 77 (4): 1383-1403.
[14]. Sarfaraz, H. and Amini, M. (2020). Numerical modeling of rock slopes with a potential of block-flexural toppling failure. Journal of Mining and Environment. 11 (1): 247-259.
[15]. Cai, J.C., Ju, N.P., Huang, R.Q., Zheng, D., Zhao, W.H., Li, L. Q. and Huang, J. (2019). Mechanism of toppling and deformation in hard rock slope: a case of bank slope of Hydropower Station, Qinghai Province, China. Journal of Mountain Science. 16 (4): 924-934.
[16]. Kiliç, R. and Ulamiş, K. (2020). Toppling and sliding in volcanic bimrocks around Bayrakli (Izmir, Turkey). Journal of Mountain Science. 17 (2): 492-500.
[17]. Mohtarami, E., Jafari, A. and Amini, M. (2014). Stability analysis of slopes against combined circular–toppling failure. International journal of rock mechanics and mining sciences, 67, 43-56.
[18]. Frayssines, M. and Hantz, D. (2009). Modelling and back-analysing failures in steep limestone cliffs. International Journal of Rock Mechanics and Mining Sciences. 46 (7): 1115-1123.
[19]. Haghgouei, H., Kargar, A.R., Amini, M. and Esmaeili, K. (2020). An analytical solution for analysis of toppling-slumping failure in rock slopes. Engineering Geology, 265, 105396.
[20]. Sari, M. (2021). Secondary toppling failure analysis and optimal support design for ignimbrites in the Ihlara Valley (Cappadocia, Turkey) by finite element method (FEM). Geotechnical and Geological Engineering. 39 (7): 5135-5160.
[21]. Evans, R., Valliappan, S., Mcguckin, D. and Raja Sekar, H.L. (1981, September). Stability analysis of a rock slope against toppling failure. In ISRM International Symposium. OnePetro.
[22]. Nichol, S.L., Hungr, O. and Evans, S.G. (2002). Large-scale brittle and ductile toppling of rock slopes. Canadian Geotechnical Journal. 39 (4): 773-788.
[23]. Alejano, L.R., Veiga, M., Pérez-Rey, I., Castro-Filgueira, U., Arzúa, J. and Castro-Caicedo, Á.J. (2019). Analysis of a complex slope failure in a granodiorite quarry bench. Bulletin of Engineering Geology and the Environment. 78 (2): 1209-1224.
[24]. Alejano, L.R., Gómez-Márquez, I. and Martínez-Alegría, R. (2010). Analysis of a complex toppling-circular slope failure. Engineering Geology. 114 (1-2): 93-104.
[25]. Amini, M. and Ardestani, A. (2019). Stability analysis of the north-eastern slope of Daralou copper open pit mine against a secondary toppling failure. Engineering Geology, 249, 89-101.
[26]. Amini, M., Sarfaraz, H. and Esmaeili, K. (2018). Stability analysis of slopes with a potential of slide-head-toppling failure. International journal of rock mechanics and mining sciences, 112, 108-121.
[27]. Sarfaraz, H., Khosravi, M.H. and Amini, M. (2019). Numerical analysis of slide-head-toppling failure. Journal of Mining and Environment. 10 (4): 1001-1011.
[28]. Sarfaraz, H. (2020). A simple theoretical approach for analysis of slide-toe-toppling failure. Journal of Central South University. 27 (9): 2745-2753.
[29]. Sarfaraz, H. and Amini, M. (2020). Numerical simulation of slide-toe-toppling failure using distinct element method and finite element method. Geotechnical and Geological Engineering. 38 (2): 2199-2212.
[30]. Zienkiewicz, O.C., Humpheson, C. and Lewis, R. W. (1975). Associated and non-associated visco-plasticity and plasticity in soil mechanics. Geotechnique. 25 (4): 671-689.
[31]. Amini, M., Ardestani, A. and Khosravi, M. H. (2017). Stability analysis of slide-toe-toppling failure. Engineering Geology, 228, 82-96. | ||
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