Summary
Geotechnically three major units were distinguished; the upper ironstone with high strength parameters and high permeability, the middle unindurated mudstone with high clay content and the lower loose sandstone with some intercalated and disseminated shales.
The mode of stratification and the geotechnical characteristics of this horizontally stratified series favor some unstable conditions. The correlation of the index geotechnical properties of the units with slope morphology confirmed the existence of such instabilities. These were grouped as old and young slope processes; the old ones could not have been observed without the aid of the aerial photo interpretation.
Résumé
Géotechniquement, 3 unités principales ont été dinstinguées: le mineral de fer du sommet, avec des paramètres de haute résistance et une grande perméabilité, les pélites indurées du milieu avec une proportion élevée d'argile et les grès peu consolidés de la base avec des interlits d'argiles disséminés.
Le type de stratification et les caractéristiques géotechniques de ces séries stratifiées horizontales sont sujets à des conditions d'instabilité. La corrélation des propriétés géotechniques index des unités avec la morphologie des pentes confirme l'existence de telles instabilités. Celles-ci ont été groupées en mouvements de pente anciens et récents, les anciens n'ayant pu être observés que grâce à l'utilisation de la photo interprétation.
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Avci, M. Ancient and recent mass movements in the cretaceous sedimentary series of the Lokoja area, Nigeria. Bulletin of the International Association of Engineering Geology 21, 27–31 (1980). https://doi.org/10.1007/BF02591537
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DOI: https://doi.org/10.1007/BF02591537