Physical modelling of caving propagation process and damage profile ahead of the cave-back | ||
| Journal of Mining and Environment | ||
| مقاله 9، دوره 11، شماره 4، دی 2020، صفحه 1047-1058 اصل مقاله (16.3 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22044/jme.2020.9845.1908 | ||
| نویسندگان | ||
| V. Heydarnoori1؛ M. H. Khosravi* 1؛ M. Bahaaddini2 | ||
| 1School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran | ||
| 2Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran | ||
| چکیده | ||
| The cavability assessment of rock mass cavability and indicating the damage profile ahead of a cave-back is of great importance in the evaluation of a caving mine operation, which can influence all aspects of the mine operation. Due to the lack of access to the caved zones, our current knowledge about the damage profile in caved zones is very limited. Among the different approaches available, physical modelling can provide a useful tool for assessment of the cave propagation and understanding the cave-back mechanism. Despite the general belief of the continuous damage profile ahead of a cave, the recent studies have shown a different mechanism of banding fracture. In order to investigate the caving mechanism ahead of a cave, a base friction apparatus is designed in this work. The base friction powder is used as the modelling material for physical testing, where its strength properties is significantly dependent on its unit weight. The effects of the material’s unit weight and the undercutting process on the cavability and cave-back height are studied. The experimental results undertaken in this research work clearly confirm the banding fracture mechanism in the caved zone, rather than continuous yielding. The effect of the undercutting sequence on the cave-back height is investigated through three different scenarios of symmetric undercutting with a gradual increase in span, symmetric undercutting with a sudden increase in span, and asymmetric undercutting. The results obtained show that the ground deformation is significantly dependent on the undercutting sequence, where choosing a greater undercutting span results in a faster cave propagation and smaller accessible undercut spans. | ||
| کلیدواژهها | ||
| Physical modelling؛ Cave mining؛ Cavability assessment؛ Banding fracture؛ Damage profile | ||
| مراجع | ||
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[1]. Hartman, H. L.and Mutmansky, J. M. Introductory Mining Engineering. 2nd ed: John Wiley & Sons; 2002. [2]. deWolfe, C. and Ross, I. (2016). Super Caves – Benefits, Considerations and Risks. Seventh International Conference & Exhibition on Mass Mining, Melbourne, Australia, 51-8. [3]. Flores, G., Karzulovic, A. and Brown, E. (2004). Current practices and trends in cave mining. MassMin 2004, Santiago, Chile, 83-9. [4]. Hebblewhite, B.K. (2003). Management of geotechnical risks in mining projects. Mining Risk Management Conference: Effective Risk Management for Mining Project Optimisation, Sydney, Australia. [5]. Westman, E., Luxbacher, K. and Schafrik, S. (2012). Passive seismic tomography for three-dimensional time-lapse imaging of mining-induced rock mass changes. The Leading Edge. 31(3): 338-45. [6]. Oh, J., Bahaaddini, M., Sharifzadeh, M. and Chen, Z. (2019). Evaluation of air blast parameters in block cave mining using particle flow code. International Journal of Mining, Reclamation and Environment. 33(2): 87-101. [7]. Brown, E.T. Block Caving Geomechanics. Queensland, Australia: Julius Kruttschnitt Mineral Research Centre; 2003. [8]. Rafiee, R., Ataei, M., KhalooKakaie, R., Jalali, S.E., Sereshki, F. and Noroozi, M. (2018). Numerical modeling of influence parameters in cavabililty of rock mass in block caving mines. International Journal of Rock Mechanics and Mining Sciences. 10522-7. [9]. Rafiee, R., Ataei, M. and KhalooKakaie, R. (2015). A new cavability index in block caving mines using fuzzy rock engineering system. International Journal of Rock Mechanics and Mining Sciences. 7768-76. [10]. Rafiee, R., Ataei, M., Khalokakaie, R., Jalali, S.M.E. and Sereshki, F. (2015). Determination and assessment of parameters influencing rock mass cavability in block caving mines using the probabilistic rock engineering system. Rock Mechanics and Rock Engineering. 48(3): 1207-20. [11]. Someehneshin, J., Oraee-Mirzamani, B. and Oraee, K. (2015). Analytical model determining the optimal block size in the block caving mining method. Indian Geotechnical Journal. 45(2): 156-68. [12]. Azadmehr, A., Jalali, S. M. E. and Pourrahimian, Y. (2019). An Application of Rock Engineering System for Assessment of the Rock Mass Fragmentation: A Hybrid Approach and Case Study. Rock Mechanics and Rock Engineering. 52(11): 4403-19. [13]. Duplancic, P. and Brady, B.H. (1999). Characterisation of caving mechanisms by analysis of seismicity and rock stress. 9th International Congress on Rock Mechanics, Paris, France, 1049-53. [14]. Duplancic, P. (2002). Characterisation of caving mechanism through analysis of stress and seismicity. PhD Thesis, University of Western Australia. [15]. Sainsbury, B.A. (2010). Sensitivities in the numerical assessment of cave propagation. Caving 2010 : Second International Symposium on Block and Sublevel Caving, Nedlands, Western Australia, 523-36. [16]. Heslop, T.G. (1976). Rock mechanics aspects of block caving chrysotile asbestos orebodies at Shabanie mine, Rhodesia. MSc Thesis, University of the Witwatersrand, Johannesburg. [17]. Panek, L.A. (1981). Ground movements near a caving stope. Design and Operation of Caving and Sublevel Stoping Mines, New York, 329-54. [18]. Szwedzicki, T., Widijanto, E. and Sinaga., F. (2004). Propagation of a caving zone, a case study from PT Freeport, Indonesia. 4th International Conference and Exhibition on Mass Mining, MassMin 2004, Santiago-Chile, 508-12. [19]. Carlson, G. and Golden, R. (2008). Initiation, growth, monitoring and management of the 7210 cave at Henderson mine – A case study. 5th International Conference and Exhibition on Mass Mining, MassMin 2008, Luleå, Sweden. [20]. Lorig, L.J., Hart, R.D., Board, M.P. and Swan, G. (1989). Influence of discontinuity orientations and strength on cavability in a confined environment. The 30th US Symposium on Rock Mechanics (USRMS), Morgantown, West Virginia, 167-74. [21]. Sharrock, G., Slade, N., Thin, I. and Duplancic, P. (2002). The prediction of stress induced caving on a mining abutment. 1st International Seminar on Deep and High Stress Mining, Perth. [22]. Glazer, S.N. and Hepworth, N. (2005). Seismicity Induced by Cave Mining, Palabora Experience. Proceedings of the Sixth International Symposium on Rockburst and Seismicity in Mines Proceedings, Perth, 281-9. [23]. Hudyma, M., Potvin, Y. and Allison, D. (2008). Seismic monitoring of the Northparkes Lift 2 block cave - Part I undercutting. Journal of the Southern African Institute of Mining and Metallurgy. 108405-19. [24]. Hudyma, M., Potvin, Y. and Allison, D. (2008). Seismic monitoring of the Northparkes Lift 2 block cave - Part 2 production caving. Journal of the Southern African Institute of Mining and Metallurgy. 108421-30. [25]. Hudyma, M.R. and Potvin, Y. (2008). Characterizing caving induced seismicity at Ridgeway gold mine. editor / MassMin 2008, Lulea, Sweden, 931-42. [26]. Glazer, S.N. and Townsend, P. (2008). The application of seismic monitoring to the future Lift 2 development at Palabora Mining Company. 5th international conference and exhibition on mass mining, Luleå, Sweden, 919–30. [27]. Woodward, K. (2011). Investigation of block caving mechanics through the interpolation of seismic occurrence and source parameters. Perth, Western Australia Thesis, The University of Western Australia. [28]. Reyes-Montes, J., Sainsbury, B., Pettitt, W., Pierce, M. and Young, R. (2010). Microseismic tools for the analysis of the interaction between open pit and underground developments. 2nd International Symposium on Block and Sublevel Caving, Perth, 119–32. [29]. Reyes-Montes, J., Pettitt, W., Pierce, M. and Young, R. (2010). Microseismic validation of jointed rock models in cave mining. 44th US Rock Mechanics Symposium, Alexandria. [30]. Tibbett, J.D., Suorineni, F.T. and Hebblewhite, B.K. (2015). Investigating block caving geomechanics using seismic space-time sequences and virtual reality scientific visualization. 49th US Rock Mechanics/Geomechanics Symposium, Alexandria. [31]. Tibbett, J.D., Suorineni, F.T. and Hebblewhite, B.K. (2016). Understanding damage source mechanisms in a caving system using virtual reality scientific visualisation. MassMin 2016, Melbourne. [32]. Abolfazlzadeh, Y. (2013). Application of seismic monitoring in caving mines - Case study of Telfer gold mine. MS.c. Thesis, Laurentian university, Sudbury. [33]. Bahaaddini, M., Hagan, P., Mitra, R. and Hebblewhite, B.K. (2013). Numerical investigation of asperity degradation in the direct shear test of rock joints. Eurock 2013 conference, Wroclaw, Poland. [34]. Bahaaddini, M., Sharrock, G. and Hebblewhite, B.K. (2011). A comparison of physical and numerical experiments on artificial jointed rock masses using PFC3D. 2nd International FLAC/DEM Symposium Melbourne, Australia, 321-30. [35]. Bahaaddini, M., Sharrock, G., Hebblewhite, B.and Mitra, R. (2012). Direct shear tests to model the shear behaviour of rock joints by PFC2D. 46th US Rock Mechanics/Geomechanics Symposium, Chicago, IL, USA. [36]. Bahaaddini, M. and Rahimi, M. (2018). Distinct element modelling of the mechanical behaviour of intact rocks using voronoi tessellation model. Int Journal of Mining & Geo-Engineering. 52(1): 61-8. [37]. Vyazmensky, A., Elmo, D., Stead, D. and Rance, J.R. (2007). Combined finite-discrete element modelling of surface subsidence associated with block caving mining. 1st Canada - US Rock Mechanics Symposium, Vancouver, Canada, 467-76. [38]. Lisjak, A., Tatone, B., Mahabadi, O. and Grasselli, G. (2012). Block caving modelling using the Y-Geo hybrid finite-discrete element code. MassMin 2012, Westmount. [39]. Li, L. C., Tang, C.A., Zhao, X.D. and Cai, M. (2014). Block caving-induced strata movement and associated surface subsidence: a numerical study based on a demonstration model. Bull Eng Geol Environ. 73(4): 1165-82. [40]. Garza-Cruz, T.V. and Pierce, M. (2014). A 3DEC model for heavily veined massive rock masses. 48th US Rock Mechanics/Geomechanics Symposium, Alexandria. [41]. Khosravi, M.H., Pipatpongsa, T., Takahashi, A. and Takemura, J. (2011). Arch action over an excavated pit on a stable scarp investigated by physical model tests. Soils and Foundations. 51(4): 723-35. [42]. Takemura, J., Kondoh, M., Esaki, T., Kouda, M. and Kusakabe, O. (1999). Centrifuge model tests on double propped wall excavation in soft clay. Soils and Foundations. 39(3): 75-87. [43]. Khosravi, M.H., Takemura, J., Pipatpongsa, T. and Amini, M. (2016). In-flight excavation of slopes with potential failure planes. Journal of Geotechnical and Geoenvironmental Engineering. 142(5): 06016001. [44]. McNearny, R.L. and Abel, J.F. (1993). Large-scale two-dimensional block caving model tests. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 30(2): 93-109. [45]. Cumming-Potvin, D., Wesseloo, J., Jacobsz, S.W. and Kearsley, E. (2016). Results from physical models of block caving. 17th International Conference and Exhibition on Mass Mining (MassMin 2016), Sydney, Australia, 329–40. [46]. Cumming-Potvin, D. (2018). An extended conceptual model of caving mechanics. Ph.D. Thesis, The University of Western Australia, Perth, Australia. [47]. Chitombo, G.P. (2010). Cave mining: 16 years after Laubscher's 1994 paper 'Cave mining – state of the art'. Mining Technology. 119(3): 132-41. [48]. Goodman, R.E. Methods of geological engineering in discontinuous rocks: West Publishing Co; 1976. [49]. Nishida, T., Esaki, T.and Kameda, N.A development of the base friction technique and its application to subsidence engineering. In: Chengxiang L. I., Ling Y., editors. Proceedings of the International Symposium on Engineering in Complex Rock Formations: Pergamon; 1988. p. 386-92. [50]. Sturzenegger, M. and Stead, D. (2009). Close-range terrestrial digital photogrammetry and terrestrial laser scanning for discontinuity characterization on rock cuts. Engineering Geology. 106(3–4): 163-82. [51]. Kawamoto, T., Obara, Y. and Ichikawa, Y. (1983). A base friction apparatus and mechanical properties of a model material: Fundamental study on mechanical properties of rock structures with discontinuity (1st Report). Journal of the Mining and Metallurgical Institute of Japan. 99(1139): 1-6. [52]. 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): 143-65. [53]. Amini, M., Majdi, A. and Aydan, Ö. (2009). Stability Analysis and the Stabilisation of Flexural Toppling Failure. Rock Mechanics and Rock Engineering. 42(5): 751-82. [54]. Amini, M., Ardestani, A. and Khosravi, M.H. (2017). Stability analysis of slide-toe-toppling failure. Engineering Geology. 22882-96. [55]. He, L., Wu, G. and Wang, H. (2012). Study of base friction simulation tests based on a complicated engineered bridge slope. Frontiers of Structural and Civil Engineering. 6(4): 393-7. | ||
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