Models for water retention and unsaturated permeability in full range of water content

ZHANG Zhao; LIU Feng-yin; ZHANG Guo-ping

doi:10.11779/CJGE201411013

Volume 36 Issue 11

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Chinese Journal of Geotechnical Engineering > 2014 > 36(11): 2069-2077. > DOI: 10.11779/CJGE201411013

ZHANG Zhao, LIU Feng-yin, ZHANG Guo-ping. Models for water retention and unsaturated permeability in full range of water content[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(11): 2069-2077. DOI: 10.11779/CJGE201411013

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Models for water retention and unsaturated permeability in full range of water content

1. Institute of Geotechnical Engineering,Xi’
an University of Technology, Xi’
an 710048, China;
2. Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Amherst 01003, USA

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Received Date: March 30, 2014
Published Date: November 19, 2014

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Abstract

The existing models for water retention and unsaturated permeability are successful at higher water contents but often give poor results at lower water contents. The water retention curve can be divided into capillary and adsorption segments by a dividing point, where the residual volumetric water content is assumed to vary with the matric suction, which can improve the applicability of Van Genuchten model to range of lower volumetric water content, and further extend it to the full range of volumetric water content. In addition, a permeability model for film flow in an even spherical particle assembly is modified by introducing a correction factor. The total unsaturated permeability is then considered to be the sum of those due to capillary and film flows. The two modified models are then verified using the test data of water retention and unsaturated permeability at higher and lower volumetric water contents for six loams in the existing literatures. The results show that the two modified models mach the measurements of water retention and unsaturated permeability better than the traditional models in the full range of volumetric water content.
- unsaturated soil,
- water retention behavior,
- permeability behavior,
- full range of water content,
- complete dryness

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