Determination of soil permeability coefficient following an updated grading entropy method
File Type:
PDFItem Type:
Journal ArticleDate:
2020Access:
openAccessCitation:
O'Kelly, B.C. & Nogal, M., Determination of soil permeability coefficient following an updated grading entropy method, Geotechnical Research, 7, 1, 2020, 58 - 70Download Item:
Abstract:
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.
Author's Homepage:
http://people.tcd.ie/bokellyhttp://people.tcd.ie/nogalm
Description:
PUBLISHED
Author: O'Kelly, Brendan C.; Nogal, Maria
Type of material:
Journal ArticleSeries/Report no:
Geotechnical Research;7;
1;
Availability:
Full text availableSubject (TCD):
Smart & Sustainable Planet , Environmental Geotechnics , GEOTECHNICAL ENGINEERING , Geotechnics , PERMEABILITY , PERMEABILITY CHARACTERISTICS , PERMEABILITY CO-EFFICIENT , PERMEABILITY MATHEMATICAL MODEL , SAND , Soil Mechanics , Soil Mechanics & Foundations , geotechnicalDOI:
https://doi.org/10.1680/jgere.19.00036Metadata
Show full item recordLicences: