Abstract:
Research to determine the coefficient of permeability based on effective grain size of
sand have been carried out by several researches. Those research is mainly aimed to develop
equation to predict permeability of soils. However, the relationship between permeability and
fine fraction has never been specifically considered. This study was performed to find the
relationship between the coefficient permeability and soil properties and soil classification
related to fine fraction. In addition to that, the suitability of permeability equation to
available data is evaluated.
Nearly 100 undisturbed samples were tested for their coefficient of permeability in
laboratory. Grain size, hydrometer, and consistency analyses were also performed. The data
obtained from the testing soil properties such as the value of k, liquid limit (LL), plastic limit
(PL) plasticity index (PI), percent sand, percent fine, percent silt, and percent clay. The data
are than arranged and analyzed for possible correlations.
It is found that previous correlations cannot be used because the soil in this study are
mainly fine grained soil, were as the existing equation are suitable for sand. Fat clay is the
smallest soil permeability, the next row is, and lean clay, lean clay with sand, sandy lean clay,
and most of it are clayey sand. Obtained relationship between permeability and fine grains
are k = (205.15e-0.081xF) x 10-6 in cm/sec. The equation applies if the fines contained in the soil between more than 25%.
