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Open AccessArticle

Permeability Coefficient of Low Permeable Soils as a Single-Variable Function of Soil Parameter

Faculty of Environmental, Geomatic and Energy Engineering, Kielce University of Technology, 25-314 Kielce, Poland
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Water 2019, 11(12), 2500; https://doi.org/10.3390/w11122500
Received: 16 September 2019 / Revised: 19 November 2019 / Accepted: 22 November 2019 / Published: 27 November 2019
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.
Keywords: permeability coefficient; cohesive soils; Darcianity of flow; plasticity index; convexity of particles; void ratio; pore diameter permeability coefficient; cohesive soils; Darcianity of flow; plasticity index; convexity of particles; void ratio; pore diameter
MDPI and ACS Style

Kozlowski, T.; Ludynia, A. Permeability Coefficient of Low Permeable Soils as a Single-Variable Function of Soil Parameter. Water 2019, 11, 2500.

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