Estimation of the soil-water characteristic curve from the grain size distribution of coarse-grained soils

Zhai, Qian; Rahardjo, Harianto; Satyanaga, Alfrendo; Dai, Guoliang

doi:10.1016/j.enggeo.2020.105502

Cited by 52 publications

(18 citation statements)

References 26 publications

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“…However, the SWCC of the treated loess trended to the upper right compared with the untreated loess, that is, under the same matrix suction, the treated loess had a higher volumetric water content than the untreated loess. These results are in line with previous findings (Eyo et al, 2020;Zhai et al, 2020). White et al (1970) and Vanapalli et al (1999) suggested that the SWCC can be divided into three stages namely boundary effect, transition, and unsaturated.…”

Section: Effect Of Clps On Soil Water Retentionsupporting

confidence: 93%

A Cross-Linked Polymer Soil Stabilizer for Hillslope Conservation on the Loess Plateau

et al. 2021

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The soil of the Loess Plateau is highly susceptible to erosion due to its distinct loess structure with poor water stability and disintegrates easily. Previous research has focused on improving soil strength without considering stability and ecological performance. Comprehensive improvements may be achieved by cross-linked polymers (CLPs), but their effect on loess structure remains unclear. In the present study, we investigate CLPs as a new organic soil stabilizer to improve soil aggregate stability. To determine the effect of CLPs on the stabilization of loess, a series of indoor tests was conducted to assess unconfined compressive strength, water stability, soil-water characteristics, and plant height. The stabilization mechanism was analyzed by comparing the microstructure, mineral composition, and features of functional groups of loess before and after treatment. The results showed that, compared with untreated loess, the unconfined compressive strength and anti-disintegration property of treated loess were significantly increased. The water retention capacity was improved, and the germination rate and growth of plants were promoted. Microscopic analysis showed that the use of CLPs did form new minerals in the loess or change the functional groups, rather, CLPs improved the microstructure, reduced the total volume of pores, and increased the degree of soil compaction. Field tests showed that the erosion of loess hillsides was effectively controlled by CLPs. Under the same erosive conditions, the slope surface treated with CLPs was more intact than the untreated slope surface. Our findings provide new strategies regarding the application of CLPs as soil stabilizers to control loess erosion and promote vegetation restoration.

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Section: Effect Of Clps On Soil Water Retentionsupporting

confidence: 93%

A Cross-Linked Polymer Soil Stabilizer for Hillslope Conservation on the Loess Plateau

et al. 2021

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“…At the same volumetric moisture content, the matrix suction of top tailings is greater than that of bottom tailings, the matrix suction of top tailings is 18.6% higher than that of bottom tailings under natural volumetric moisture content (14.0%). According to the experimental results of the previous studies (Chen et al, 2018;Zhai et al, 2020), the matrix suction increased with decreasing soil particle size (Negative correlation) and with increasing non-uniformity coefficient (Positive correlation). However, as can be seen from Figure 5, experimental results show that tailings (Top tailings) with minor uniformity coefficients have larger matrix suction, indicating that the particle size plays a more important role than the non-uniformity coefficient to affect the matrix suction of fine-grained tailings.…”

Section: Effect Of Particle Gradation On the Swcc Of Fine-grained Tailingsmentioning

confidence: 83%

“…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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“…In subcritical hydrophobic soils, the contact angle is between 0 to 90 degrees. In these soils, water slowly enters the soil (17). In real hydrophobic soils, the contact angle reaches more than 90 degrees preventing water from entering the soil (18).…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrocarbonic pollutants on the stability and soil water repellency intensity: A case study in Bandar Abbas Oil Refinery, Hormozgan province, Iran

Asadi

Najafi

Chavoshi

et al. 2022

Environ Health Eng Manag

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Background: The contamination of soil and water with hydrocarbonic pollutants is a major environmental problem. Soil water repellency will interrupt water infiltration, and may decline plant growth and potentially trigger soil erosion. The aim of this study was to investigate the effect of soil and water contamination by oil on soil water repellency, where the soil has been oil-contaminated due to mismanagement of the lands surrounding the refineries, and many of the trees in the area have dried up. Methods: Water drop penetration time test (WDPT) was performed on contaminated soils. To investigate the effect of the surface water contamination on soil, handmade soil samples were collected and successive dry/wet cycles were applied to them by contaminated and non-contaminated waters. Subsequently, soil water repellency tests, including molarity of ethanol droplet (MED), water and ethanol sorptivity were performed on soil samples. The soils were passed through a 2 mm sieve after being air-dried and the soil texture was determined by pipette method. The SWR was measured by WDPT in the area contaminated with petroleum compounds and 7 to 10 replicates were assigned to each location. In order to determine the effect of water contamination on the area soil and to measure water repellency in the laboratory, disturbed soil samples (36 samples) with a bulk density equal to 80% of the reference bulk density were prepared. Results: The results showed that soil oil-contamination causes water repellency, increased WDPT, a significant increase in water repellency index, and a significant decrease in cosθ at the level of 0.001. The effect of water contamination on the indices and cosθ were statistically significant at the 0.001 and 1% levels, respectively. Therefore, contaminated water increased the water repellency of the soil after successive dry/wet cycles. Conclusion: Significant positive correlations between organic and water repellency indices and significant negative correlations between cosθ and organic indices indicate the effect of oil-contamination of water and soil on creating and increasing the intensity of soil water repellency.

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Estimation of the soil-water characteristic curve from the grain size distribution of coarse-grained soils

Cited by 52 publications

References 26 publications

A Cross-Linked Polymer Soil Stabilizer for Hillslope Conservation on the Loess Plateau

A Cross-Linked Polymer Soil Stabilizer for Hillslope Conservation on the Loess Plateau

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

Effect of hydrocarbonic pollutants on the stability and soil water repellency intensity: A case study in Bandar Abbas Oil Refinery, Hormozgan province, Iran

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