Modelling the effect of density on the unimodal soil-water characteristic curve

Wijaya, Martin; Leong, Eng Choon

doi:10.1680/jgeot.15.p.270

Cited by 32 publications

(13 citation statements)

References 33 publications

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“…The SWCC is dependent on the initial dry density or initial void ratio (Tarantino, 2009;Zhou et al, 2014;Wijaya and Leong, 2017). However, the effect of initial dry density on w-SWCC, θ-SWCC and S-SWCC is different.…”

Section: Consideration Of Volume Changementioning

confidence: 99%

Soil-water characteristic curves - Determination, estimation and application

Leong

2019

JGS Special Publication

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The soil-water characteristic curve (SWCC) is a relationship between water content in a soil and suction. The SWCC was first plotted by Edgar Buckingham, a soil physicist, in 1907 for six soils ranging in texture from sand to clay. It was adopted for use in unsaturated soil mechanics by the geotechnical engineering community. The SWCC is now almost treated as the index property of unsaturated soils. It has been used as a proxy for permeability and shear strength of unsaturated soil. Most soils have a sigmoidal SWCC, otherwise known as a unimodal SWCC as opposed to a bimodal SWCC which has been found for some soils. Although determining the SWCC is easier than determining permeability or shear strength for unsaturated soil, the test is still time-consuming and it is not easy to determine the entire SWCC. Incomplete or insufficient SWCC data may lead to an incorrect SWCC and hence inaccurate determination of permeability and shear strength. Progress has been made to expedite the experimental determination of SWCC as well as estimating the SWCC from basic soil properties using pedotransfer functions. In addition, SWCC has been represented using volumetric water content, gravimetric water content or degree of saturation. Different representations may have dire consequences on its application. Determining the SWCC using volumetric water content or degree of saturation presents challenges in estimating the instantaneous volume during the experiment. In this paper, the current state-of-the-art in determining, representing and estimating SWCC and its applications are described and critically examined.

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Section: Consideration Of Volume Changementioning

confidence: 99%

Soil-water characteristic curves - Determination, estimation and application

Leong

2019

JGS Special Publication

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“…Since SWCC is used as the basis for the estimation of other unsaturated soil parameters, it is important to have a mathematical model which fitting parameters can be used to represent the variables of SWCC. Numerous equations have been suggested to model the experimental data of SWCC [1,2,3,4,5,6]. However, these equations were limited for the drying SWCC.…”

Section: Introductionmentioning

confidence: 99%

Exponential Functions for Modelling Hysteresis of Soil-Water Characteristic Curves

et al. 2020

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Soil – water characteristic curve (SWCC) is an important property of unsaturated soils that can be used to estimate various parameters to describe unsaturated soil behavior. SWCC is reported to be hysteretic because the water content at a given suction in the wetting process is less than that in the drying process. In order to simulate the hysteretic characteristics of SWCC, many models have been proposed by different researchers. However, majority of the existing models are complex and their parameters are not related to the physical significances of SWCC variables. In this study, the new equations are developed to model drying and wetting SWCC. In addition, some indexes are proposed to estimate the wetting SWCC from drying SWCC. The new equations for SWCCs were evaluated with the laboratory data from published literatures. The results showed that the proposed equations performed well in modelling drying and wetting SWCC. The new equation has less parameters than the existing published equation.

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“…A decrease in the initial void ratio of a soil causes a decrease in the saturated gravimetric water content and thus affects the initial portion of the SWCC but as suction increases, the SWCCs merge into a single curve at high suctions (Wijaya, 2017). This observation is a unique advantage of the SWCC-w and has been taken advantage of when modeling initial density effects on SWCCs of a soil for example, Salager et al (2010), and Wijaya and Leong (2017).…”

Section: Effect Of Initial Density the Swccmentioning

confidence: 98%

“…2) Initial dry density e.g. Salager et al (2010), Zhou et al (2012), Mirzaii and Yasrobi (2012), and Wijaya and Leong (2017).…”

Section: Soil-water Characteristic Curves Of Compacted Soilsmentioning

confidence: 99%

“…The water content can be represented as either gravimetric water content (w), volumetric water content (θw) or degree of saturation (S). Because of this, the resulting SWCC can be designated based on the type of water content used to represent it i.e., SWCC-w for gravimetric water content, SWCC-θW for volumetric water content and SWCC-S for degree of saturation (Wijaya and Leong, 2017).…”

Section: Swcc-wmentioning

confidence: 99%

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Suction, hydraulic and strength properties of compacted soils

Kizza¹

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Modelling the effect of density on the unimodal soil-water characteristic curve

Cited by 32 publications

References 33 publications

Soil-water characteristic curves - Determination, estimation and application

Soil-water characteristic curves - Determination, estimation and application

Exponential Functions for Modelling Hysteresis of Soil-Water Characteristic Curves

Suction, hydraulic and strength properties of compacted soils

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