Abstract
In this study, a proposed Galat Sufar open pit mine, river Nile state, Sudan has been approved through mining design processes. However, the area situated within highly tectonic region with different rock masses. This study is aimed to assess surface and sub-surface conditions of the rock masses and identify the expected rock failures. In this study, Televiewer survey and core logging methods are performed for sub-surface investigation. The limited surface exposure of the rock masses lead to the big differences from those recorded from the oriented core samples. Two shear planes and three joint sets constitute the discontinuity properties of surface rock masses, while two foliation planes (S1: 86°/059° and S2: 78°/292°) and four joint sets (J1:89°/244°; J2:12°/076°; J3: 71°/287° and J4:74°/158°) were recognized from drilled boreholes. In order to determine appropriate bench face angle for the weathered and fresh rock masse kinematic analysis technique was adopted using dip software. The kinematic scenarios performed at 20° and 10°-slope direction intervals, while bench face angles is calculated for 50°, 55° and 60° at the pit border for the top weathered rock masses and 70°, 75° and 80° for the sub surface one. The results show that the southern part of the proposed mine represents the highest risk with toppling failure for the top weathered rock masses, while low planar and toppling failure risk values recorded for the sub-surface rock masses. Finally, this study recommended that during mine development inherent site investigation must be continued to examine the stability of rock masses for the expected slope failure especially the southern part of the proposed mine.
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References
Abdelsalam MG, Stern RJ, Copeland P, El Faki EM, El Hur B, Ibrahim FM (1998) The neoproterozoic keraf suture in NE Sudan: sinistral transpression along the eastern margin of West Gondwana. J Geol 106:133–147
Abdelsalam MG, Abdelrahman EM, El-Faki EM, Al-Hur B, El-Bashier F, Stern RJ, Thurmond AK (2003) Neoproterozoic deformation in the northeastern part of the Saharan Metacraton, northern Sudan. Pre Res 123:203–221
Denkler T, Franz G, Schandelmeier H (1994) Tectono-metamorphic evolution of the neoproterozoic delgo suture zone. North Sudan Geol Rundschau 83:578–590
Dongab M, Kulatilake PHSW, Zhang F (2018) Deformation and stability investigations in 3-D of an excavated rock slope in a hydroelectric power station in China. Comput Geotech 96:132–149
Eberhardt ED (2003) Rock slope stability analysis utilizing advance numerical techniques. Earth Ocean sci UBC 41
Galley AG, Hannington MD, Jonasson IR (2007) Volcanogenic massive sulphide deposits, in good fellow. In: WD (ed) Mineral deposits of Canada: a synthesis of major deposit types, district Metallogeny, the Evolution of geological provinces, and exploration methods: geological association of Canada, mineral deposits division, Special Publication No. 5, pp 141–161
Goodman RE, Shi G (1985) Block Theory and its application to rock engineering. Prentice Hall Engilewood Cliffs, NJ
Hoek E, Bray JW (1981) Rock slope engineering, 3rd edition. CRC Press, London: Institution of Mining Metallurgy, p 402
Johnson PR, Andresen A, Collins AS, Fowler AR, Fritz H, Ghebreab W, Kusky T, Stern RJ (2011) Late Cryogenian-Ediacaran history of the ANS: a review of depositional, plutonic, structural, and tectonic events in the closing stages of the northern Eastern African Orogen. J Afr Earth Sc 61(2011):167–232
Jun Z, Kulatilake PHSW, Deng J, Wei J (2015) Development of a probabilistic kinematic wedge sliding analysis procedure and application to a rock slope at a hydropower site in China. Bull Eng Geol Env 25(4):1413–1428
Kliche CA (1999) Rock slope stability. SME, Littleton, CO
Kulatilake PHSW, Wu Q, Yu Z, Jiang F (2013) Investigation of stability of a tunnel in a deep coal mine in China. Int J Min Sci Technol 23(4):579–589
Kulatilake PHSW, Shu B (2015) Prediction of Rock mass deformations in three dimensions for a part of an open pit mine and comparison with field deformation monitoring data. Int J Geotech Geolo Eng 33:1551–1568
Kulatilake PHSW, Balasingam P, Park J, Morgan R (2006) Natural rock joint roughness quantification through fractal techniques. Int J Geotech Geolo Eng 24(5):1182–1202
Read JRL, Lye GN (1983) Pit slope design methods, Bougainville copper limited open cut Prroc. 5th Cong. ISRM, Balkema, Rotterdam, Melbourne, pp C93–C98
Read P, Stacey (2009) Guidelines for open pit slope design, CSIRO Publishing, Lieden, Netherlands: CRC, Collingwood, p 512
Um J-G, Kulatilake PHSW (2001) Kinematic and Block theory analyses for shiplock slopes of the three gorges dam site in China. Geotech Geolo Eng 19:21–42
Vaziri A, Moore I, Ali H (2010) Monitoring systems for warning impending failure in slope and open pit mine. Nat Hazards 55:501–512. https://doi.org/10.1007/s11069-010-9542-5
Wang KPHSW, L, Tang H, Liang Y, (2011) Evaluation of rock slope stability Yujian river dam site by kinametic and block theory analyses. Comput Geotech 38:846–860
Wyllie DC, Mah CW (2005) Rock slope engineering: civil and mining, 4th edition. Spon Press, Taylor Frances Group, London and New York, p 431
Ge Y, Kulatilake PH, Tang H, **ong C (2014) Investigation of natural rock joint roughness. Comput Geotech 55:290–305
Zheng J, Kulatilake PHSW, Shu B, Sherizadeh T, Dong J (2014) Probabilistic block theory analysis for a rock slope at an open pit mine in USA. Comput Geotech 61:254–265
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Bashir, M.A.H., Ali, E. Assessment of Rock Slope Instability of the Proposed Galat Sufar Open Pit Mine, River Nile State, Sudan. Geotech Geol Eng 40, 4393–4418 (2022). https://doi.org/10.1007/s10706-022-02161-2
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DOI: https://doi.org/10.1007/s10706-022-02161-2