Geotechnical and geophysical characterization of the Bouira-Algiers Highway (Ain Turck,Algeria) landslide |
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| Authors: | Brahim Meziani Djamel Machane Abderrahmane Bendaoud Ghani Cheikh Lounis El-Hadi Oubaiche Souhila Chabane Rabah Bensalem Hakim Moulouel |
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| Institution: | 1.Département de Géologie,Faculté des Sciences de la Terre, de Géographie et de l’Aménagement du Territoire (FSTGAT) - USTHB,Bab Ezzouar,Algeria;2.LNHC Unité Bouira-Tour n°7 cité 1100 logements,Bouira,Algeria;3.Centre National de Recherche Appliquée en Génie Parasismique (CGS), 1 Rue Kadour Rahim,Algiers,Algeria |
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| Abstract: | The Ain Turck (Bouira) landslide, in north-center Algeria, is one of the numerous instabilities recorded along the Lakhdaria-Bouira section of the 1200-km-long east-west Algerian highway. The locality of Ain Turck is known for its unstable slopes characterized by a very rough morphology with steep slopes (20 to 25%). This slide threatens the inhabitants of the Ibournanen village, located down the unstable slope, where parts of some houses have fallen into ruin, while others are cracked. It is characterized by an active movement extending over a more or less important slope, of the order of a hundred meters. The land mobilized by this movement corresponds to the layer of shale clays and clays overlaid by a backfill, placed there following the east-west highway works. Geological, geomorphologic, and geotechnical analysis allows determining the soil instability probably related to earthworks during the construction of the highway section a few years earlier, followed by a particularly rainy season in 2012. Acquisitions of ambient seismic noise and H/V ratio processing, as well as the acquisition of an electrical resistivity profile at the instability site, have reinforced our preliminary interpretations of depth and geometry of the sliding surface. |
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