Abstract
The determination of the mechanical properties of soils containing particles larger than the allowable size of standard laboratory equipments is complex. It is indeed necessary to remove the coarsest fraction to carry out the tests. This scalping poses a problem of reliability of the results at the scale of the structure. Parallel gradation is the method commonly used for estimating the shear strength of heterogeneous granular soils from tests on their finer fraction. However, the effect of high fines content on the estimation of shear strength by this method is not well understood. The results of this study show that the parallel gradation method can predict the friction angle of the initial soil with high fines content when the modelled soil has a similar skeleton as the initial soil. However, the cohesion of the initial soil is overestimated.
Highlights
Heterogeneous granular soils with matrix are composed of variable grains size
This study focuses on estimating the shear strength of heterogeneous granular soils with a high percentage of fines (> 10%) by using the parallel gradation method
The aim of this study was to determine if the shear strength of a granular soil with fines content greater than 10% can be correctly estimate by parallel gradation method
Summary
Heterogeneous granular soils with matrix are composed of variable grains size (from a few microns to several tens of centimetres) Soil types in this category can be of natural deposit (alluvium, scree, moraine, etc.) or made by humans (rockfill). A direct shear box of 1 m3 was used to determine the failure parameters of rock aggregates [1] and a triaxial cell of 1 m in diameter and 1.5 m in height was used for studying rockfills [2] These devices, which allow to test soils with a grain size up to 160 mm, are few, complex to implement and unsuitable for materials with larger grain size
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