E3S Web Conf.
Volume 195, 20204th European Conference on Unsaturated Soils (E-UNSAT 2020)
|Number of page(s)||5|
|Section||Experimental Evidence and Techniques|
|Published online||16 October 2020|
A new approach of accounting for impedance effects in Gardner’s method of determining the hydraulic conductivity of unsaturated soils
1 Ecole des Ponts ParisTech. Navier/CERMES, F 77455 Marne la Vallée, France
2 Ecole des Ponts ParisTech, HM&Co, F 77455, Marne la Vallée, France
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Based on tests carried out on a specific device allowing to determine the water retention and transport properties of granular media at low suctions, an alternative approach to Kunze and Kirkham’s method of accounting for the impedance effects due to the high air entry value ceramic disk when using Gardner’s method is proposed. Impedance effects are accounted for by proposing analytical solutions to the equations governing water transfers occurring within the specimen and the ceramic disk. By using some experimental data obtained on a volcanic granular substrate used for urban green roofs, the method is successfully compared to Kunze and Kikham’s graphical method. Its advantages are to be simpler of use and not operator dependent. A detailed examination of the performance of our method compared to those of Gardner and Kunze and Kirkham is carried out based on experimental data, that confirm its validity.
© The Authors, published by EDP Sciences 2020
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