SWCC of Calcareous Silty Sand Under Different Fines Contents and dry Densities

Shen, Jing; Ming-jian, HU; Wang, Xing; Zhang, Chenyang; Xu, Dongsheng

doi:10.3389/fenvs.2021.682907

Cited by 17 publications

(9 citation statements)

References 46 publications

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“…Parameter α decreases with an increasing dry density, while parameter n initially decreases and then increases with the dry density. The trend observed for parameter α aligns with the findings of Shen et al (2021) [61], who established a quadratic relationship between parameter α and the dry density. Samples NO.…”

Section: Swccs Of Undisturbed Loess Samples Buried In Different Layerssupporting

confidence: 90%

Analysis of Soil–Water Characteristic Curve and Microstructure of Undisturbed Loess

Tan,

Dai,

Zhao

et al. 2024

Applied Sciences

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Long-term irrigation promotes the infiltration of water in the thick, stratified loess layer, significantly raising the groundwater table and triggering a series of landslides in loess platform areas. The soil–water characteristic curve (SWCC) of loess buried at different depths affects the unsaturated infiltration process and is intricately connected to the soil’s microstructure. The SWCCs, scanning electron microscope (SEMs), and pore size distributions (PSDs) for five sets of undisturbed loess samples at depths ranging from 3.4 to 51.9 m are shown in this paper. The results indicate that the fitting parameter air entry value (AEV) of the SWCC rises from 13.67 kPa to 40.19 kPa as the depth increases from 3.4 to 51.9 m. And the saturated volumetric water content drops by 10.9%, with a notable SWCC shape difference between the transition and residual zones observed. Additionally, the total porosity of undisturbed loess falls by 12% when the depth increases from 3.4 to 51.9 m, while the macropores and mesopores reduce by 3.6% and 12.1%, respectively. These findings highlight the control of the pore structure on the SWCC and emphasize the correspondence between the SWCC and PSD. The conclusions also illustrate that the compaction effect changes the microstructure characteristics of loess, thereby affecting the soil’s water retention behavior.

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Section: Swccs Of Undisturbed Loess Samples Buried In Different Layerssupporting

confidence: 90%

Analysis of Soil–Water Characteristic Curve and Microstructure of Undisturbed Loess

Tan,

Dai,

Zhao

et al. 2024

Applied Sciences

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“…The CS void ratio is elevated [33], suggesting that the primary alteration stage of θ w likely occurs within the low ψ range [32]. Therefore, a pressure plate test was administered to measure the SWCC of CS, ensuring test result accuracy.…”

Section: Test Schemementioning

confidence: 99%

“…PoSD strongly correlates with PSD [31]. Limited research examines the relationship among the PSD, PoSD, and water-retention capacity of CS [32]. By elucidating the influence of PSD on PoSD and understanding the mechanism through which PoSD impacts the water-retention capacity, PoSD serves as a crucial link between the PSD and water-retention capacity.…”

Section: Introductionmentioning

confidence: 99%

Study on Effect of Particle Size Distribution on Water-Retention Capacity of Coral Sand from Macro and Micro Perspective

Wu,

Lei,

Chen

et al. 2024

JMSE

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The reclamation coral sand (CS) layer is the survival environment for island reef vegetation in the South China Sea. The root system within the CS bed draws water necessary for vegetation growth, implying that the water-retention capacity of CS plays a pivotal role in determining vegetation viability. Particle size distribution (PSD) significantly influences the water-retention capacity of geomaterials. This study examines the impact of PSD on the water-retention capacity of CS from both macro (soil–water characteristic curve, SWCC) and micro (pore water distribution) perspectives using the pressure plate test and nuclear magnetic resonance technique, and an F&X model was used to analyze the SWCC of CS. The findings indicated that the F&X model aptly describes the SWCC of CS with different PSDs. Both the air entry value and residual water content rise with an increased content of fine grains (d < 0.25 mm), suggesting that the presence of fine grains augments the water-retention capacity of CS. It is considered that a size range of d = 0.075–0.25 mm predominantly impacts the water-retention capacity of CS. The PSD primarily influences the water-retention capacity by affecting the pore size distribution of CS. The volume of small pores swells with the surge of fine-grain content, while the maximum pore size contracts with increasing fine-grain content. Limited pore connectivity in CS means macropores can retain water even under high suction, bolstering the water-retention capacity of CS. These findings offer theoretical guidance for selecting gradation parameters for the planting layer on island reefs.

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“…However, in these areas, there are large areas of soft soil which has the characteristics of large porosity ratio, high water content, high compressibility, and low strength. When the highways are constructed on soft soil, the subgrade's large settlement or uneven settlement will occur [1,2]. This is very harmful to subgrade stability.…”

Section: Introductionmentioning

confidence: 99%

Analytical and Numerical Study on the Stability of Highway Subgrade with Embedded Loading Berm in Soft Soil Area

et al. 2022

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Loading berm is an effective method for improving highway subgrade stability in soft soil areas. However, this method requires lots of construction space. It is not applicable in some areas with narrow construction spaces. To address this problem, an embedded loading berm (ELB) is proposed to improve highway subgrade stability, and the effects of ELB on the stability of the highway subgrade were investigated by analytical and numerical methods. Firstly, an analytical model was proposed to analyze the relationship between the ELB dimensions and subgrade stability factors. Then, numerical simulations were carried out to further reveal the stability factor of an actual subgrade with different ELBs. Lastly, ELB parameters’ sensitivity to the ELB stability factors was studied. The results show that the stability of the highway subgrade in soft soil areas can be significantly improved by the proposed ELB. With the loading berm width and height increasing, the subgrade stability factors can increase. The stability factors’ increase ratio with the increased ELB width is greater than that with the increased ELB height. The ELB parameter sensitivity order on the subgrade stability is as follows: width > height > density > cohesion > internal friction. In the design process, the ELB width and height can be mainly focused on. The research is significant for promoting the application of ELB in soft soil areas.

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SWCC of Calcareous Silty Sand Under Different Fines Contents and dry Densities

Cited by 17 publications

References 46 publications

Analysis of Soil–Water Characteristic Curve and Microstructure of Undisturbed Loess

Analysis of Soil–Water Characteristic Curve and Microstructure of Undisturbed Loess

Study on Effect of Particle Size Distribution on Water-Retention Capacity of Coral Sand from Macro and Micro Perspective

Analytical and Numerical Study on the Stability of Highway Subgrade with Embedded Loading Berm in Soft Soil Area

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