  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
showed that the parallel gradation method could predict the friction angle of
the initial soil with high fines content when the modelled soil had a similar
skeleton as the initial soil. However, the cohesion of the initial soil was
overestimated.
