Determination of soil permeability coefficient following an updated grading entropy method
Item Type:Journal Article
Citation:O'Kelly, B.C. & Nogal, M., Determination of soil permeability coefficient following an updated grading entropy method, Geotechnical Research, 7, 1, 2020, 58 - 70
This paper presents a critical review of the grading entropy approach of permeability-coefficient predictions (k P) for coarse-grained soils. The approach applies the grading entropy theory to particle-size distributions (PSDs), such that the entirety of each gradation curve can be interpreted as a single point on a grading entropy chart, plotting its normalised entropy increment (B) against relative base grading entropy (A) values. Published data sets of measured permeability-coefficient (k M) values for saturated compacted silty sand, sand and gravel materials are examined to understand the dependence of A and B on various gradation parameters and the void ratio (e). In particular, log k M negatively correlates with log B and positively correlates with log A and e (log e). As such, power functions of the form 𝑘𝐏=𝐶1𝐴𝐶2𝐵𝐶3𝑒𝐶4 prove statistically superior, noting that the fitting coefficient C 1 to C 4 values are specific to the PSD range and densification (compaction) states investigated for the permeability tests. Recommendations are given for increasing the predictive power, including separate models for well-graded and poorly graded materials and the addition of a particle shape factor and specific surface parameters in the regression correlation.
Type of material:Journal Article
Series/Report no:Geotechnical Research;
Availability:Full text available
Subject (TCD):Smart & Sustainable Planet , Environmental Geotechnics , GEOTECHNICAL ENGINEERING , Geotechnics , PERMEABILITY , PERMEABILITY CHARACTERISTICS , PERMEABILITY CO-EFFICIENT , PERMEABILITY MATHEMATICAL MODEL , SAND , Soil Mechanics , Soil Mechanics & Foundations , geotechnical