Integrated geotechnical and geophysical investigations in a landslide site at Jijel, Algeria - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of African Earth Sciences Année : 2019

Integrated geotechnical and geophysical investigations in a landslide site at Jijel, Algeria

Nour El Houda Mezerreg
  • Fonction : Auteur
Farès Kessasra
  • Fonction : Auteur
Youcef Bouftouha
  • Fonction : Auteur
Hamza Bouabdallah
  • Fonction : Auteur
Abdelmalek Baghdad
  • Fonction : Auteur
Rachid Bougdal
  • Fonction : Auteur

Résumé

Geophysical methods have been proven to be very effective in landslide characterization. The present paper focuses on the study of land instabilities, which are affecting Tamantout Village, South of Jijel. The site is composed by marl overcoming from unstable overlying Numidian nappes, a major source of a huge spreading of debris covering slopes with inclination of 35°. This study aims are to characterize the internal structure and the hydrological conditions of the moving masses, identifying the soil movement nature and geological and geotechnical factors governing the movement. For these, Electrical Resistivity Tomography (ERT) and Shallow Seismic Refraction (SSR) methods were applied. Indeed, the results were correlated with the available geological and geotechnical data that, in turn, showed a perfect correlation with landslide structures. Occupying 450 (m) of the central part of the profile, the landslide was oriented NE-SW, represented by resistivity ranging between 1 and 10 (Ω.m) and seismic velocity between 1720 and 2235 (m/s). Numidian formation is composed of clays of 15 (m) thickness, covered by a thin layer of slope screes characterized by higher resistivity ranging from 40 to 300 (Ω.m) and a high seismic velocity oscillating between 2485 and 3120 (m/s). It represents the geotechnical bedrock with hard schistose with a depth varying from 7 to 15 which has sound appearance and well indicated lithology through boreholes and geotechnical tests. The geophysical study confirmed the existence of fracture plans associated with intraformational water flows. Reinforcement methods adapted to landslides were proposed in order to secure traffic on the one hand and surrounding land on the other hand, in addition to guaranteeing the socio-economic development in these isolated areas of Jijel province.
Fichier non déposé

Dates et versions

hal-02956253 , version 1 (02-10-2020)

Identifiants

Citer

Nour El Houda Mezerreg, Farès Kessasra, Youcef Bouftouha, Hamza Bouabdallah, Nicolas Bollot, et al.. Integrated geotechnical and geophysical investigations in a landslide site at Jijel, Algeria. Journal of African Earth Sciences, 2019, 160, pp.103633. ⟨10.1016/j.jafrearsci.2019.103633⟩. ⟨hal-02956253⟩
42 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More