Abstract: Based on the results of experimental studies concerning the filtration coefficient, the
Darcianity of the observed flows for eight cohesive soils at four hydraulic gradients was analyzed.
It is observed that linear dependence of flow velocity on hydraulic gradient is an approximation
only, and it is the worse the more cohesive a given soil is. Despite this, Darcy’s law can be a correct
approximation of the empirical relationship between hydraulic gradient and the flow velocity, also
in very cohesive soils. A statistical analysis was carried out to identify correlation between soil
properties and permeability coefficient. For each soil, 109 parameters were analyzed, among others
applying mercury intrusion porosimetry, scanning electron microscopy, dynamic image analysis,
and laser diffraction. Ultimately, three single-variable models best fitted to the experimental data
were found, using the plasticity index IP as the independent variable, the average pore diameter DP,
and the convexity of silt fraction particles. All model parameters are statistically significant at p <
0.05. Comparison with reference multi-variable models showed that the best fit for experimental
data is observed by the model with the plasticity index, while the results suggest low usability of
single-variable models with structural parameters.
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