Study on the soil water characteristic curve and its fitting model of Ili loess with high level of soluble salts

Wang, Yuguo; Zhang, Aijun; Ren, Wenyuan; Niu, Lisi

doi:10.1016/j.jhydrol.2019.124067

Cited by 30 publications

(8 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e commonly used test methods include the pressure plate method, filter paper method, centrifuge method, and tensiometer method. e centrifuge method is widely used because of its simple operation, short time usage, and the ability to measure the SWCC under high matric suctions [1][2][3][4][5]. As a kind of soil with high clay content and a large number of hydrophilic minerals, expansive soil has a series of special properties such as strong water sensitivity, swelling, and shrinkage.…”

Section: Introductionmentioning

confidence: 99%

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Niu

Zhang

Zhao³

et al. 2021

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

This paper targets the expansive soils in Heilongjiang and Ankang to explore the influence of initial dry density, dry-wet cycle, and freeze-thaw cycle on the soil-water characteristics. The centrifuge method was used to obtain the soil-water characteristic curves (SWCCs) with different conditions. The volumetric strain of SWCC was modified based on the shrinkage test, and the corresponding fitting equations considering different factors were established. The results show that the volumetric water content is modified to consider the volume shrinkage effect of expansive soil, and the modification is more obvious in the high matric suction range. The smaller the initial dry density is, the worse the water-holding capacity of the sample is, and the smaller the air intake value is. The greater the time of the dry-wet cycle is, the greater the saturated volumetric water content of the sample is, and the corresponding water-holding capacity is significantly reduced. When the dry-wet cycle increases to a certain extent, the structure becomes stable. With the increase of the freeze-thaw cycle, the saturated volumetric water content first decreases and then increases. Similarly, after several times of the freeze-thaw cycle, the structure is basically stable. The fitted Gardner model equations under different conditions were proved to be able to describe the SWCCs of the two targeted expansive soils.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Niu

Zhang

Zhao³

et al. 2021

Advances in Civil Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Another reason lies in the fact that, with increasing CS concentration, more amount of soluble salts mainly including urea and calcium chloride were retained after each cycle of drying. The residual soluble salts improved the soil water retention capacity by increasing the soil osmotic suction, and eventually suppressed the water evaporation (Abbasi et al., 2011; Y. Wang et al., 2019). In addition, the recrystallization of residual salts during drying also contributed to the increase of soil matric suction and the reduction of soil water evaporation by filling the soil pores.…”

Section: Discussionmentioning

confidence: 99%

Section: Effect Of Cementation Solution Concentration On Soil Pore Wa...mentioning

confidence: 99%

Potential Drought Mitigation Through Microbial Induced Calcite Precipitation‐MICP

Liu

Tang

Pan

et al. 2021

Water Resources Research

View full text Add to dashboard Cite

Extreme drought events occur more frequently due to climate change. Soil water loss through evaporation is therefore significantly intensified. This study introduces an environment‐friendly and sustainable bio‐mediated technique, known as microbially induced calcite precipitation (MICP), for water evaporation suppression in clayey soils. Through lab‐scale evaporation tests, we investigate the effects of cementation solution concentration (0.5, 1.0, and 1.5 mol/L) and MICP treatment procedure (one‐phase and two‐phase MICP methods) on both macroscale (e.g., water loss, desiccation cracking) and microscale (e.g., microstructure variations) behaviors of soils. Experimental results show that MICP is capable of improving water retention capacity and enhancing the inter‐particle bonding of clayey soils. Both water evaporation rate and total water loss decrease with the increasing concentration of cementation solution and the number of MICP treatment cycle. For most testing samples, both one‐phase and two‐phase MICP treatment methods have a similar influence on soil properties. Further microstructure characterizations reveal four key factors contributing to the improved soil response under drying, including dense surface crust, remediated desiccation cracks, smaller pore size and residual solutes. Dense structure of surface crust suppresses the migration of water vapor into the atmosphere. Calcite crystals tend to reduce the evaporation surface if precipitated within cracks, and clog the movement of pore water if precipitated within the soil pore space. This study is expected to improve the fundamental understanding of soil‐atmosphere interactions under MICP treatment and provide insights into the potential application of bio‐mediated technologies as a nature‐based solution for drought mitigation in arid and semi‐arid region.

show abstract

“…Such damage can be serious and can lead to building or structural damage. Meanwhile, Wang et al [3] explored the dynamic characteristics and thawing-settlement characteristics of roadbed fillers in a place on the Qinghai-Tibet Plateau. e test results showed that the soil samples with higher and lower compaction showed frost heave deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Assouline et al [18] have analyzed and compared the results from Brazil's Palotina and Cascavel's soils and have found that under the same soil pore structure, the water-holding properties of the two soils are also affected by the mineral composition, such as iron oxide and free aluminium hydroxide. Wang et al [3] studied the influence of salinity on the soil-water characteristic curve of the Yili loess by using the centrifugal method and filter paper method in view of the high salinity state inside the loess in Yili, China, but the test results showed that salinity had little influence on the soil-water characteristic curve. e results in Zhou et al's research [19] showed that the dry density, particle size, and hydrophilic mineral content of the soil had a great impact on the soil-water characteristic curve.…”

Section: Introductionmentioning

confidence: 99%

Soil‐Water Characteristics of the Low Liquid Limit Silt considering Compaction and Freeze‐Thaw Action

Yao

Luo

Qian

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

The soil-water characteristic curve of silty soil in seasonal frozen area during freezing-thawing process was studied in this study. By means of a laboratory test, specimens with different compaction degrees and different initial moisture content were prepared and put into the temperature change testing machine for freeze-thaw action. The influence of different degrees of compaction and different times of freeze-thaw action on SWCC of low liquid limit silt was analyzed, a V-G model was used to fit the test data, and a set of fitting parameters with a reference value was obtained. At the same time, the change of microstructure between soil particles during the freezing-thawing cycle is illustrated. The results showed that with the same water content and the same compactness, the matric suction of the test soil decreased with the increase of freeze-thaw cycles. For the same number of freeze-thaw cycles, the greater the compactness, the greater the matric suction of the soil. The V-G model can well represent the SWCC of low liquid limit silt during the freeze-thaw cycle.

show abstract

Study on the soil water characteristic curve and its fitting model of Ili loess with high level of soluble salts

Cited by 30 publications

References 7 publications

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Study on Soil‐Water Characteristics of Expansive Soil under the Dry‐Wet Cycle and Freeze‐Thaw Cycle considering Volumetric Strain

Potential Drought Mitigation Through Microbial Induced Calcite Precipitation‐MICP

Soil‐Water Characteristics of the Low Liquid Limit Silt considering Compaction and Freeze‐Thaw Action

Contact Info

Product

Resources

About