Journal ArticleDOI
Equations for the soil-water characteristic curve
Delwyn G. Fredlund,Anqing Xing +1 more
TLDR
In this paper, a nonlinear, least squares computer program is used to determine the best-fit parameters for experimental data presented in the literature, based on the assumption that the shape of the soil-water characteristic curve is dependent upon the pore-size distribution.Abstract:
The soil-water characteristic curve can be used to estimate various parameters used to describe unsaturated soil behaviour. A general equation for the soil-water characteristic curve is proposed. A nonlinear, least-squares computer program is used to determine the best-fit parameters for experimental data presented in the literature. The equation is based on the assumption that the shape of the soil-water characteristic curve is dependent upon the pore-size distribution of the soil (i.e., the desaturation is a function of the pore-size distribution). The equation has the form of an integrated frequency distribution curve. The equation provides a good fit for sand, silt, and clay soils over the entire suction range from 0 to 106 kPa. Key words : soil-water characteristic curve, pore-size distribution, nonlinear curve fitting, soil suction, water content.read more
Citations
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Journal ArticleDOI
Predicting the permeability function for unsaturated soils using the soil-water characteristic curve
TL;DR: The coefficient of permeability for unsaturated soil is primarily determined by the pore-size distribution of the soil and can be predicted from the soil-water characteristic curve as mentioned in this paper.
Book
Unsaturated Soil Mechanics in Engineering Practice
TL;DR: This paper explains the nature of each of the previous challenges to the implementation of unsaturated soil mechanics, and the determination of indirect techniques for the estimation of uns saturated soil property functions.
Journal ArticleDOI
Water permeability, water retention and microstructure of unsaturated compacted Boom clay
TL;DR: In this paper, three classes of experiments are considered to provide information for two artificially prepared Boom clay fabrics: mercury intrusion/extrusion tests, main wetting/drying paths; and water inflow/outflow transient (permeability) tests.
Journal ArticleDOI
Use of indicators and pore volume-function characteristics to quantify soil physical quality
TL;DR: The Dexter "S -value" (S gi ) is a promising new indicator of soil physical quality (SPQ), but it is not well tested against established indicators, such as relative field capacity (RFC), plant-available water capacity (PAWC), air capacity (AC), macroporosity (P MAC), bulk density (BD), organic carbon content (OC), and structural stability index (SI) as discussed by the authors.
Journal ArticleDOI
Soil–environment interactions in geotechnical engineering
TL;DR: In this paper, the authors consider the effects of new phenomena and new variables on soil behavior, such as high temperatures, associated with the problem of storage and disposal of high-level radioactive waste; and low temperatures in problems of freezing ground.
References
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Journal ArticleDOI
A closed-form equation for predicting the hydraulic conductivity of unsaturated soils
van Genuchten,M. Th. +1 more
TL;DR: Van Genuchten et al. as mentioned in this paper proposed a closed-form analytical expression for predicting the hydraulic conductivity of unsaturated soils based on the Mualem theory, which can be used to predict the unsaturated hydraulic flow and mass transport in unsaturated zone.
Book
Soil Mechanics for Unsaturated Soils
TL;DR: In this paper, the Mecanique des sols reference record was created on 2004-09-07, modified on 2016-08-08, and it was used for the Sols non satures reference record.
Journal ArticleDOI
Some steady-state solutions of the unsaturated moisture flow equation with application to evaporation from a water table
TL;DR: Gardner as mentioned in this paper describes some STEADY-state solutions of the UNSATURATED MOISTURE FLOW EQUATION with application to EVAPORATION from a WATER TABLE.
Journal ArticleDOI
Empirical equations for some soil hydraulic properties
R. B. Clapp,George M. Hornberger +1 more
TL;DR: In this paper, a power function relating soil moisture and hydraulic conductivity is used to derive a formula for the wetting front suction required by the Green-Ampt equation.