Geotechnical and geophysical characterization of the Bouira-Algiers Highway (Ain Turck, Algeria) landslide
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ARABGU2016
Geotechnical and geophysical characterization of the Bouira-Algiers Highway (Ain Turck, Algeria) landslide Brahim Meziani 1,2 & Djamel Machane 3 & Abderrahmane Bendaoud 2 & Ghani Cheikh Lounis 1 & El-Hadi Oubaiche 3 & Souhila Chabane 1 & Rabah Bensalem 3 & Hakim Moulouel 3
Received: 25 December 2016 / Accepted: 19 February 2017 / Published online: 7 March 2017 # Saudi Society for Geosciences 2017
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. This article is part of the Topical Collection on Current Advances in Geology of North Africa * Brahim Meziani [email protected]
1
Département de Géologie, Faculté des Sciences de la Terre, de Géographie et de l’Aménagement du Territoire (FSTGAT) - USTHB, BP. 32, El Alia, 16111 Bab Ezzouar, Alger, 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, B.P. 252 Hussein Dey, Algiers, Algeria
Keywords Landslide . Electrical resistivity tomography . HVSR ambient vibration . Clays . Algeria
Introduction The Algerian population is mainly concentrated in the northern part of Algeria, which is subjected to different types of natural hazards, such as earthquakes and landslides. It is then important to well constrain them. Landslides (Benaissa et al. 1989; Benaissa and Bellouche 1999; Machane 2002; Machane et al. 2004, 2008; Bougdal et al. 2006, 2013; Guemache et al. 2010, 2011; Djerbal and Melbouci 2012; Hadji et al. 2013, 2016; Guirous and Dubois 2014; Bourenane et al. 2015; Laribi et al. 2015) are a major geological hazard to be faced in the region. The landslide risk is high, especially in the northern part of Algeria, where economic significant investments have been made in the roadwork (road and highway); particularly for the east-west highw
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