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Variability in the shear strength characteristics of an amphibolite derived laterite soil

  • Ogunsanwo Olufemi
Article

Abstract

Variability in the shear strength characteristics of a fine grained amphibolite derived laterite soil within an area of one square metre in the same horizon is investigated by means of consolidated undrained triaxial compression tests.

The shear strength parameters in terms of both effective and total stresses show remarkable variabilities. Cohesion values have coenfficients of variation of 65.1% and 54.7% respectively while the angle of internal friction values have coefficients of variation of 16.1% and 23.6% respectively.

The chemistry of the soil has been found to be essentially constant while the spatial distribution of the goethite present was found to be non-uniform

The variability in the shear strength characteristics of the soil is attributed to the inconsistent cementation of the soil particles by the goethite.

Keywords

Shear Strength Internal Friction Goethite Triaxial Test Shear Strength Parameter 

Variation des caractéristiques de la résistance au cisaillement d'un sol latéritique provenant d'une amphibolite

Résumé

La variation des caractéristiques de la résistance au cisaillement d'un sol latéritique provenant d'une amphibolite à grains fins, dans un mètre carré, est recherchée en se servant des essais de compression triaxiale de consolidation non drainée.

Les paramètres de la résistance au cisaillement concernant les charges effectives et totales montrent des variations importantes. Les confficients de variation pour la cohésion s'élèvent à 65,1% et 54,7%, tandis que les coefficients de variation pour l'angle de frottement interne s'élèvent à 16,1% et 23,6%.

La chimie du sol est constante, tandis que la distribution spatiale de goethite n'est pas uniforme. La variation des caractéristiques de la résistance au cisaillement est attribuable à la cimentation irrégulière des particules du sol par la goethite.

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Copyright information

© International Assocaition of Engineering Geology 1985

Authors and Affiliations

  • Ogunsanwo Olufemi
    • 1
  1. 1.Department of GeologyUniversity of IfeIle-Ife, Oyo StateNigeria

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