Comparison between methods of soil saturation on determination of the soil water characteristic curve of cohesive soils

Fattah, Mohammed Y.; Majeed, Qutaiba G.; Joni, Hassan H.

doi:10.1007/s12517-020-06362-y

Cited by 13 publications

(7 citation statements)

References 10 publications

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“…Various direct and indirect methods are available for measuring soil suction, including the Tensiometer method [9], pressure apparatus [10,11], and electrical resistance blocks [12], as well as the filter paper method [13]. In recent decades, several empirical models have been developed to predict SWCC, such as Gardner [14], Brooks Corey [15], Van Genuchten [16], and Fredlund and Xing [17], among others.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Soil-Water Characteristic Curves (SWCC) of Expansive Soil: Effects of Sand Content, Initial Saturation, and Initial Dry Unit Weight

Alnmr,

Alzawi,

Ray

et al. 2024

Water

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Soil-water characteristic curve (SWCC) is an essential parameter in unsaturated soil mechanics, and it plays a significant role in geotechnical engineering to enhance theoretical analysis and numerical calculations. This study investigated the effects of key factors, such as the percentage of sand, initial degree of saturation, and initial dry unit weight, on the SWCC of expansive soil by measuring the matric suction using a pressure apparatus method. The empirical equation of SWCC was obtained using the Van Genuchten and Fredlung Xing models, and the processing of experimental data checks the fitting of the two empirical models. The findings revealed that the Fredlung Xing model fit the relationship between matric suction and volumetric water content of expansive soil better than the Van Genuchten model, indicating that the pressure apparatus approach’s experimental data are correct and acceptable. The study also found that the matric suction increased with decreasing percentage of added sand at the same volumetric moisture content, and the increase in initial dry unit weight increased the matric suction, with the water retention capacity decreasing significantly after adding 20% sand. Moreover, as the initial degree of saturation increased, the volumetric water content decreased, and the characteristic curves became identical when the initial saturation degree reached 90%. Finally, to minimize the water retention capacity of expansive soils, the study recommended adding a percentage of sand not less than 30% to the expansive clay sample.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Soil-Water Characteristic Curves (SWCC) of Expansive Soil: Effects of Sand Content, Initial Saturation, and Initial Dry Unit Weight

Alnmr,

Alzawi,

Ray

et al. 2024

Water

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“…Fattah [14] found that SWCCs differed among bulk densities and that an increase in bentonite content had little effect on the SWCCs. Zhou [15] proposed that changes of soil physical composition, particle size and dry density would affect SWCCs, and Fattah [16] Compared the effects of soil saturation method and soil saturation method on SWCC and showed that the capillary rise saturation gives a higher value than the top surface water top and the variable water content method for both wetting and drying SWCC cases. Khlosi [17] found that the plastic limit, texture, carbonate content, specific surface area and bulk density of 11 chemical and physical soil properties affected SWCCs.…”

Section: Introductionmentioning

confidence: 99%

Soil-Water Characteristic Curves and Fitting Models of Collapsible Loess: A Case Study of Lanzhou, China

Zhao¹,

Zhang²,

Hu³

et al. 2022

Pol. J. Environ. Stud.

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The soil-water characteristic curve (SWCC) is an important hydrodynamic representation of soil and the basis for studying the water content of collapsible loess. The objectives of this study were to determine the water holding capacity of collapsible loess and the best fitting model of SWCC. We selected representative samples of collapsible loess in Lanzhou and measured the SWCCs. The SWCCs for soil samples varied with bulk density and particle size. The shapes were the same, but the volumetric water content (VWC) decreased as the suction increased. The suction of different soil layers tended to first decrease rapidly, then decrease more gradually and finally stabilize with VWC. The fitted VWC for the VG model was closer to the measured content, and the accuracy of the model was high. The VG-M (1-1/n, n) model was the best of the six models tested and was selected as the optimal model for fitting SWCCs, which will provide a theoretical basis for the accurate fitting of data of collapsible loess.

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“…The previous research results show that gradation, temperature, and initial dry density are the key factors affecting the SWCC of tailings, so it is necessary to quantitatively evaluate the effect of key factors on the SWCC to analyze the stability of the unsaturated part of the tailings dam. There are many instruments available for measuring the matric suction, such as the Tensiometer Method (Marinho et al, 2008), Pressure apparatus (Bechtold et al, 2018;Jiang et al, 2020), Electrical resistance blocks (Zeitoun et al, 2021), etc., and indirect methods, such as the Filter paper-based method (Mahler and Mendes, 2005;Fattah et al, 2021), Empirical method (Kern, 1995), etc. During the past few decades, many empirical models have been developed to predict SWCC, such as the Van-Genuechten (1980), Brooks-Corey (1964), Fredlund and Xing (1994), Gardner (1958), etc., and researchers also compared and evaluated the applicability and consistency of various empirical models (Matlan et al, 2015;Fattah et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…There are many instruments available for measuring the matric suction, such as the Tensiometer Method (Marinho et al, 2008), Pressure apparatus (Bechtold et al, 2018;Jiang et al, 2020), Electrical resistance blocks (Zeitoun et al, 2021), etc., and indirect methods, such as the Filter paper-based method (Mahler and Mendes, 2005;Fattah et al, 2021), Empirical method (Kern, 1995), etc. During the past few decades, many empirical models have been developed to predict SWCC, such as the Van-Genuechten (1980), Brooks-Corey (1964), Fredlund and Xing (1994), Gardner (1958), etc., and researchers also compared and evaluated the applicability and consistency of various empirical models (Matlan et al, 2015;Fattah et al, 2021). Based on this, the scholars investigated the SWCC of clay (Tripathy et al, 2014;Li et al, 2017), sand (Yan and Zhang, 2015), and expansive soil (Tamer et al, 2017;Ahmed et al, 2018), and they analyzed the effect of dry density (Birle et al, 2008;Gallage and Uchimura, 2010), void ratio (Heshmati and Motahari, 2015), grain size distribution (Chen et al, 2018;Zhai et al, 2020), and temperature (ElKeshky, 2011;Qiao et al, 2019) on the SWCC.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Key Factors on the Soil–Water Characteristic Curves of Fine-Grained Tailings

Cao

Tian

Gui

et al. 2021

Front. Environ. Sci.

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The soil–water characteristic curve (SWCC) is an essential parameter for studying the mechanical properties of unsaturated tailings, and it plays an important role in stability assessment and prediction of unsaturated tailings dams. In this paper, the matrix suction was measured indirectly by a filter paper-based method to investigate the effects of key factors (gradation, temperature, and initial dry density) on the soil–water characteristic curves of fine-grained tailings, and the Van Genuchten model was adopted to obtain the empirical equation of SWCC and to verify the accuracy of experimental results. The results showed the following: 1) the Van Genuchten model fits well the relationship between matric suction and volumetric moisture content of fine-grained tailings, indicating that experimental data determined by filter paper-based method is accurate and appropriate; 2) at the same volumetric moisture content, the matrix suction increased with decreasing average particle size, and the decrease in temperature will increase the matrix suction and water-holding capacity of fine-grained tailings, and the matrix suction of the tailings in summer is 38.3% lower than that in winter under the natural volumetric moisture content (14.0%); 3) when the saturation degree of fine-grained tailings is less than 60%, the greater the initial dry density, the better the water-holding capacity and matrix suction.

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Comparison between methods of soil saturation on determination of the soil water characteristic curve of cohesive soils

Cited by 13 publications

References 10 publications

Experimental Investigation of the Soil-Water Characteristic Curves (SWCC) of Expansive Soil: Effects of Sand Content, Initial Saturation, and Initial Dry Unit Weight

Experimental Investigation of the Soil-Water Characteristic Curves (SWCC) of Expansive Soil: Effects of Sand Content, Initial Saturation, and Initial Dry Unit Weight

Soil-Water Characteristic Curves and Fitting Models of Collapsible Loess: A Case Study of Lanzhou, China

Experimental Study on the Effect of Key Factors on the Soil–Water Characteristic Curves of Fine-Grained Tailings

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