Prediction of Unsaturated Soil Diffusivity Coefficient from SWCC and Saturated Permeability Tests

The diffusion coefficient is an important unsaturated soil parameter for the estimation of the moisture movement in the soil mass. The diffusion coefficient can be measured in a laboratory on Shelby tube soil specimens subjected to specified boundary conditions using thermocouple psychrometers. This parameter can also be estimated by using the soil water characteristic curve (SWCC) and saturated permeability coefficient of the soil. This research paper presents the results of the SWCC and permeability tests on an unsaturated soil and predicts the diffusion coefficient. Although there is significant difference between the diffusivity parameters obtained using the SWCC and permeability test results, the difference between the column drying test and the SWCC and permeability test results is substantial. The diffusivity coefficients obtained from the psychrometer is 103 times higher than those from the SWCC and permeability tests.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: pp 113-121
  • Monograph Title: Advances in Transportation Geotechnics and Materials for Sustainable Infrastructure

Subject/Index Terms

Filing Info

  • Accession Number: 01536497
  • Record Type: Publication
  • ISBN: 9780784478509
  • Files: TRIS, ASCE
  • Created Date: Jul 21 2014 3:03PM