Abstract
Present-day deformations occurring within both waste dump and bedrock in the Northern Table mine of Moulares, western central Tunisia, show complex landslides of kilometric dimensions. Rock bodies in this mine slide due to the shear stress concentration along a complex sliding surface. As a result of gravity displacement, these rocks display diverse associate structures such as detachment, open fractures, folds, and striated thrust planes. Interaction between predisposition factors (inherited structures, topography, slope, gravity) and triggering factors (artificial vibrations and seismotectonic activity) provided favourable conditions for the sliding. Sloping fractured ground, marly lithology and meteoric water act further to exacerbate the instability in the ground and encourage rock failure. Additionally, the seismic hazard due to the sustained tectonic activity of the Gafsa fault and the vibrations due to explosive detonation can together trigger significant landslide movement.
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References
Abbott PL (2004) Natural disasters. McGraw-Hill, New York
Ahmadi R, Ouali J, Eric Mercier, Mansy JL, Van-Vliet Lanoë B, Launeau P, Rhekhiss F, Rafini S (2006) The geomorphologic responses to hinge migration in the fault-related folds in the Southern Tunisian Atlas. J Struct Geol 28(4):721–728
Bahrouni N, Bouaziz S, Soumaya A, Ben Ayed N, Attafi K, Houla Y, El Ghali A, Rebai N (2013) Neotectonic and seismotectonic investigation of seismically active regions in Tunisia: a multidisciplinary approach. J Seismolog 18(2):235
Ben Hassen M, Rebai N, Deffontaines B, Turki M-M, Chaabani F (2011) Phosphate mine subsidences deduced from differential interferometry (DInSAR): the Moulares case example (southern Atlas of Tunisia). C R Geosci 343(2011):729–737
Boukadi N (1989) Sur le plissement disharmonique et la dispersion des axes de plis dans les couloirs de décrochement: l’exemple du faisceau de Moularès de Tunisie. C R Acad Sci II 309:2105–2110
De Blasio FV (2011) Introduction to the physics of landslides: lecture notes on the dynamics of mass wasting. Springer, Amsterdam. doi:10.1007/978-94-007-1122-8
Dlala M, Hfaiedh M (1993) Le séisme du 7 novembre 1989 à Metlaoui (Tunisie méridionale): une tectonique active en compression. C R Acad Sci Paris 317(2):1297–1307
Galfati I, Beji Sassi A, Zaier A, Bouchardon JL, Bilal E, Jordon JL, Sassi S (2010) Geochemistry and mineralogy of Paleocene Oum El Khecheb phosphorites (Gafsa-Metlaoui) Tunisia. Geochem J 44:189–210
Highland LM, Bobrowsky P (2008) The landslide handbook—a guide to understanding landslides, vol 1325. US Geological Survey Circular, Reston
Keefer DK (1984) Landslides caused by earthquakes. Geol Soc Am Bull 1984(95):406–421
Marzorati S, Luzia L, De Amicisb M (2002) Rock falls induced by earthquakes: a statistical approach. Soil Dyn Earthq Eng 22(2002):565–577
Saïd A, Chardon D, Baby P, Ouali J (2011) Active oblique ramp faulting in the Southern Tunisian Atlas. Tectonophysics 499(1–4):178–189
Schuster RL, Highland LM (2004) Impact of landslides and innovative landslide-mitigation measures on the natural environment. In: Proceedings of the International Conference on Slope Engineering, 8–10 December 2003, Hong Kong, China
Wang D, Cao L-Z, Piao C-D, Xue Y-D, Wang M (2011) Study on high and steep slope stability of surface mine based on RFPA-SRM. J Coal Sci Eng (China) 17:119–123
Zaïer A, Beji-Sassi A, Sassi S, Moody RTJ (1998) Basin evolution and deposition during the Early Palaeogene in Tunisia. Petroleum Geology of North Africa. Geol Soc Lond Spec Publ 132:375–393
Zargouni F (1985) Tectonique de l’Atlas méridional de Tunisie: évolution géométrique et cinématique des structures en zone de cisaillement. Thesis, Univ. Louis Pasteur, Strasbourg
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The authors would like to thank Martin G. Culshaw, Roger Cojean and the anonymous reviewers for their constructive comments and helpful suggestions.
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Dhahri, F., Benassi, R., Mhamdi, A. et al. Structural and geomorphological controls of the present-day landslide in the Moulares phosphate mines (western-central Tunisia). Bull Eng Geol Environ 75, 1459–1468 (2016). https://doi.org/10.1007/s10064-015-0827-5
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DOI: https://doi.org/10.1007/s10064-015-0827-5