Apport de la prospection électrique à l'étude d'un glissement de terrain dans la ville de Constantine (Algérie). Electrical survey contribution to a landslide study in the City of Constantine (Algeria).
Résumé
Cet article présente les résultats d'une prospection électrique réalisée sur le glissement de terrain (février 1997) du Ciloc, situé à l'extension ouest de la ville de Constantine. Les sondages électriques (basés sur le dispositif de Schlumberger) montrent un ensemble argilo-marneux, renfermant des niveaux perméables. Ces niveaux favorisent l'alimentation en eau et les surpressions interstitielles déstabilisatrices. Les coupes géoélectriques obtenues traduisent un ensemble de mouvements emboîtés dont l'enveloppe inférieure est assimilable à un plan. Ce dernier se localise à une profondeur de 8 à 10 m. Les sondages électriques pluridirectionnels, permettant d'étudier l'évolution de la fissuration en profondeur, semblent confirmer cette profondeur du glissement.
This paper presents the results of an electrical survey carried out on the Ciloc landslide (February 1997) in the west suburb of the City of Constantine. Vertical electrical soundings (measured after the Schlumberger pattern) show a marl-clay mass with permeable layers. These layers favour the flow of water and the destabilising interstitial overpressure in this soil mass. The obtained geo-electrical sections show a series of channelised movements with a lower limit which can be considered as a plane. The latter is situated about 8 or 10 m deep. The multi-directional electrical soundings allow the study of the development of fracturing at depth and seem to confirm this depth.
This paper presents the results of an electrical survey carried out on the Ciloc landslide (February 1997) in the west suburb of the City of Constantine. Vertical electrical soundings (measured after the Schlumberger pattern) show a marl-clay mass with permeable layers. These layers favour the flow of water and the destabilising interstitial overpressure in this soil mass. The obtained geo-electrical sections show a series of channelised movements with a lower limit which can be considered as a plane. The latter is situated about 8 or 10 m deep. The multi-directional electrical soundings allow the study of the development of fracturing at depth and seem to confirm this depth.
Origine : Accord explicite pour ce dépôt