Review of Soil-Water Characteristic Curve Equations

Leong, E. C.; Rahardjo, Harianto

doi:10.1061/(asce)1090-0241(1997)123:12(1106)

Cited by 433 publications

(247 citation statements)

References 15 publications

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“…A variety of equations can be used to describe SWCCs parametrically (Leong and Rahardjo 1997). The most common function used to describe SWCCs is the sigmoidal van Genuchten equation (van Genuchten 1980):…”

Section: Anticipated Changes In Hydraulic Propertiesmentioning

confidence: 99%

“…The parameter  is inversely related to the air entry suction and the parameter n is directly related to the slope of the SWCC (van Genuchten 1980, Tinjum et al 1997, Leong and Rahardjo 1997. Soils with lower air entry suction have larger  and SWCCs having shallower slope have smaller n. Thus,  and  s should increase, and n should decrease, as larger soils and a broader pore size distribution develops in the soil.…”

Section: Anticipated Changes In Hydraulic Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Benson

Sawangsuriya

Trzebiatowski

et al. 2007

J. Geotech. Geoenviron. Eng.

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Hydraulic properties of soils used for water balance covers measured at the time of construction and 1-4 yrs after construction are compared to assess how the hydraulic properties of cover soils change over time as a result of exposure to field conditions. Data are evaluated from ten field sites in the United States that represent a broad range of environmental conditions. The comparison shows that the saturated hydraulic conductivity (K s ) can increase by a factor of 10,000, saturated volumetric water content ( s ) by a factor of 2.0, van Genuchten's  parameter by a factor of 100, and van

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Section: Anticipated Changes In Hydraulic Propertiesmentioning

confidence: 99%

Section: Anticipated Changes In Hydraulic Propertiesmentioning

confidence: 99%

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Benson

Sawangsuriya

Trzebiatowski

et al. 2007

J. Geotech. Geoenviron. Eng.

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show abstract

“…The measured volumetric water content and the corresponding matric suction for both the primary drying and primary wetting soil-water characteristic curves werê tted using the Fredlund and Xing (1994) equation. The correction factor for theˆtting equation, C (c ), was set to 1 as recommended by Leong and Rahardjo (1997). The main purpose of the curveˆtting was to obtain smooth and full-range primary drying and wetting soil-water characteristic curves.…”

Section: Description and Parameters Of Soilsmentioning

confidence: 99%

Characteristics of Scanning Curves of Two Soils

Tami

Rahardjo

Leong

2007

Soils and Foundations

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Scanning curves of two diŠerent soils were obtained from three series of inˆltration and drainage experiments on two physical models of soil slopes in the laboratory. Theˆrst slope model consisted of aˆne sand layer overlying a gravelly sand layer, while the second slope model involved a silty sand layer overlying a gravelly sand layer. Each soil layer had a thickness of 200 mm and both slope models had an inclination angle of 309 . The slope models were subjected to artiˆcial rainfalls of diŠerent intensities, followed by draining where no rainfall was applied. Various instruments were installed to continuously measure the changes in matric suction, volumetric water content and the water balance of the slope models during the experiment. Scanning curves were then constructed using the matric suction and water content data measured at the bottom, middle and top parts of the slope models and were compared with the primary drying and primary wetting soil-water characteristic curves that were measured separately. It was found that the scanning curves followed the primary wetting curve during the adsorption process and then followed the primary drying curve during the desorption process. During the transition period, over which the scanning curve moved from the primary drying curve to the primary wetting curve (or vice versa), the path of the scanning curve had a relatively ‰at slope as compared to the slope of the primary curves, and sometimes it was almost horizontal. However, the slope and the path of the scanning curves were found to be similar for the cases with similar initial conditions.

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“…The Soil-water Characteristic Curve (SWCC), which represents a soil's ability to store and release water as it is subjected to various soil suctions, is defined as the relationship between the suction and the degree of saturation or gravimetric water content for unsaturated soils. It reflects the behavior of unsaturated soils with regard to its hydraulic conductivity, shear strength, and volume change behavior [2]. Therefore, accurate determination of SWCCs under stress conditions similar to those in the field is key for interpretation of the mechanical behavior of unsaturated soils.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Soil–Water Characteristic Curves in One-Dimensional and Isotropic Stress Conditions

Habasimbi

Nishimura

2018

Soil Systems

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Understanding unsaturated soil behavior is key to the design of foundations and embankment structures. Geotechnical engineers have applied net normal stress and matric suction to these engineering problems. Water retention activity in soils is used to predict seepage problems and stability of slope failures. Soil-Water Characteristic Curve (SWCC) tests contribute largely to matric suction interpretation. Determination of SWCCs in the laboratory is usually done using a pressure plate apparatus where vertical or confining stress cannot be applied. Mathematical models of SWCC though commonly accepted in geotechnical engineering practices, do not take into consideration stress conditions such as the difference between a one-dimensional condition and isotropic confining conditions. This study conducted SWCC tests of a silt soil under one-dimensional and isotropic confining stress conditions and focused on the differences between these types of SWCC data sets. Vertical and isotropic confining stresses ranging from 100 to 600 kPa were applied under both stress conditions. SWCCs appears to be affected by the influence of different stress conditions. Lateral pressure and confinement on an isotropic compression condition caused the soil specimen to become dense in void structure and consequently, soil moisture flow movement decreased. This probably induced high retention activities in the silt soil specimen. The study further suggests that the current SWCC models require further development to take into consideration the effect of different stress conditions.

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Review of Soil-Water Characteristic Curve Equations

Cited by 433 publications

References 15 publications

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Characteristics of Scanning Curves of Two Soils

Comparison of Soil–Water Characteristic Curves in One-Dimensional and Isotropic Stress Conditions

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