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

Cao, Baofeng; Tian, Yakun; Gui, Rong; Liu, Yong

doi:10.3389/fenvs.2021.710986

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…6, the fits performed have coefficient of variation (R2) values between 0.96 and 0.999, showing a better fit with the Fredlund and Xing model for all the samples studied. There are several factors that affect the SWCC of sandy soils, such as initial water content, void ratio and grain size distribution [14], [15] and [16]. In addition, the variation of climatic conditions causes the soil to fluctuate in drying (desorption) and wetting (absorption) cycles, making the drying and wetting cycle one of the important factors that can affect SWCC [17].…”

Section: Resultsmentioning

confidence: 99%

Estimación de la curva característica suelo agua en suelos arenosos mediante el ensayo de papel filtro

Lizana Olarte,

Aguilar-Bardales,

Calderón-Cahuana

2023

TEC

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The unsaturated soils mechanics is strongly related to the suction phenomenon that occurs between solid soil particles, which changes when the soil water content does not remain constant. The soil-water characteristic curve (SWCC) provides information related to suction and water content of the soil; and to obtain such a curve different direct and indirect methods can be used. In this research the soil-water characteristic curve for sands is obtained through the implementation of the filter paper test. For this purpose, three reconstituted samples of sandy soils from Lima – Peru (relative density between 20% and 60%) were tested following the wet path of the curve. The samples were stored at least seven days until equilibrium was reached. In this way, discrete points of the soil-water characteristic curve were obtained. SWCC equations such as Brooks and Corey (1964), Van Genuchten (1980), and Fredlund and Xing (1994) were used to adjust the data and obtain their respective parameters for sandy soils. Results show that the filter paper test can be used to obtain the soil-water characteristic curves of reconstituted sandy soils; and that the matric suction of sandy soil can be obtained in seven days period by means of this method; whereas a longer storage time could require to reach the equilibrium and to obtain the total suction for these soils.

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Section: Resultsmentioning

confidence: 99%

Estimación de la curva característica suelo agua en suelos arenosos mediante el ensayo de papel filtro

Lizana Olarte,

Aguilar-Bardales,

Calderón-Cahuana

2023

TEC

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“…The study of expansive soil's soil-water characteristic curve (SWCC) delves into the complex interactions between sand content, initial density, and initial degree of saturation, revealing subtle effects on different SWCC regions. The introduction of sand emerges as a critical factor, causing granular changes as shown in Figure 1, which significantly affects SWCC regions [28][29][30]. A gradual increase in sand content from 10% to 50% causes a significant reduction in water retention capacity, which is attributed to shifts in capillary forces, changes in pore structure, and changes in grain distribution.…”

Section: Interpreting the Influence Of Initial Conditions On Expansiv...mentioning

confidence: 99%

“…Studies have investigated the SWCC of various soils, including clay [22], sand [23], and expansive soils [11,24,25]. The influence of factors such as dry unit weight and the void ratio [25][26][27][28], gradation [28][29][30], and temperature [28,31] on SWCC have also been studied. Even small changes in soil density are known to have a significant impact on the hydro-mechanical properties of the soil.…”

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: Test Materialsmentioning

confidence: 99%

“…The particle-size range with the highest content is 0.03 mm to 0.1 mm, accounting for approximately 60% of the total content. According to the test results, the tailings in this test are fine-grained tailings [39]. The selection of the woven-polymer-material geotextile used in the tubes and its main parameters and indicators are shown in Table 1.…”

Section: Test Materialsmentioning

confidence: 99%

An Experimental Study Focusing on the Filling Process and Consolidation Characteristics of Geotextile Tubes Filled with Fine-Grained Tungsten Tailings

Liu,

Wu,

et al. 2024

Sustainability

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With advancements in mineral processing technology, the disposal of fine-grained tailings has increasingly become a significant challenge. The geotextile tube method, characterized by its use of a permeable fabric and its cost-effectiveness, has gradually been applied in dam construction and other engineering projects involving tailings. This method offers a novel approach to addressing the storage issues of fine-grained tailings and promotes sustainable utilization. In this paper, the fine tailings that remained after the cyclone classification of Ganzhou tungsten ore were taken as the research object. Specifically, this research endeavored to evaluate the effects of various filling heights and concentrations on the geotextile tube-filling and consolidation process. The results revealed that the filling concentration had a significant impact on the filling benefit of the geotextile tubes, while the filling height had a minimal effect. During the consolidation drainage stage, the dry density, internal friction angle, cohesion, and compression modulus of the tailings in the bags increased with an increasing consolidation time and filling concentration. However, the physical and mechanical properties of the tailings in the geotextile tubes decreased with an increased filling height. Ultimately, this research developed a hyperbolic equation that makes it possible to forecast the ultimate settlement value at various filling heights and concentrations, better representing how the settlement of geotextile tubes changes over the consolidation time.

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

Cited by 15 publications

References 24 publications

Estimación de la curva característica suelo agua en suelos arenosos mediante el ensayo de papel filtro

Estimación de la curva característica suelo agua en suelos arenosos mediante el ensayo de papel filtro

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

An Experimental Study Focusing on the Filling Process and Consolidation Characteristics of Geotextile Tubes Filled with Fine-Grained Tungsten Tailings

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