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Engineering-geological properties of pliocene argillaceous sediments of the Wadi El-Natrun area (Egypt)

  • M. A. Rashed
Article

Abstract

In the Wadi El Natrun area, Egypt, sediments of Upper Pliocene age, ranging from alluvial plain deposits passing through coastal plain sediments up into high-energy nearshore shallow-marine deposits, mark a transgression. Study of these sediments provides information about the origin, texture, distribution and composition of clay minerals, which in turn is used in the description of physicochemical and physicomechanical properties. The clay minerals present are smectite pure or with minor illitic layers (70–80%), illite (5–20%), and kaolinite (5–15%).

The controlling factors in the physicochemical and physicomechanical properties of the Upper Pliocene sediments are primary composition, environment of deposition, microstructure characters, and physical properties. These interacting factors have been of varying importance in time and space in the engineering-geological properties of the studied sediments.

Keywords

Clay Kaolinite Heavy Clay Argillaceous Rock Heavy Loam 

Caractéristiques géotechniques des sédiments argileux du pliocène dans la région de Wadi El-Natrum (Egypte)

Résumé

Dans la région de Wadi El-Natrun, en Egypte, les sédiments du Pliocène supérieur, qui consistent en dépôts de plaine alluviale, passant à des sédiments de plaine côtière, puis à des dépôts marins peu profonds, indiquent une transgression. L'étude de ces sédiments fournit des renseignements sur l'origine, la texture, la répartition et la composition des minéraux argileux, permettant ensuite une description des propriétés physico-chimiques et mécaniques. Les minéraux argileux présents sont la smectite pure ou avec des lits réduits d'illite (70–80%), de l'illite (5–20%) et de la kaolinite (5–15%).

Les facteurs qui influencent les caractéristiques physico-chimiques et mécaniques des sédiments du Pliocène supérieur de cette région sont leur composition de base, les conditions de dépôts, les caractéristiques microstructurales et les propriétés physiques. Les influences respectives de ces facteurs dans le temps, et dans l'espace expliquent les caractéristiques géotechniques de ces sédiments.

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Copyright information

© International Association of Engineering Geology 1991

Authors and Affiliations

  • M. A. Rashed
    • 1
  1. 1.Geology Department, Faculty of ScienceAlexandria UniversityAlexandriaEgypt

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