The authors have investigated empirical correlations between descriptions of grain characteristics and friction angle of some coarse-grained soils. They have defined strength as the peak total stress ratio and described this by a Mohr–Coulomb criterion with values of cohesion in the range 48–165 kPa and friction angles in the range 33–54°. They have related the friction angles to grain characteristics. These values and correlations raise a number of important issues.
Soil parameters fall into two classes. There are material parameters that depend only on the grains and there are state-dependent parameters that depend also on the current stress and voids...
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