Effect of freeze-thaw on freezing point of a saline loess

Wang, Qinze; Qi, Jilin; Wang, Songhe; Xu, Jian; Yang, Yugui

doi:10.1016/j.coldregions.2019.102922

Cited by 37 publications

(10 citation statements)

References 32 publications

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“…Ma et al [21] used nuclear magnetic resonance (NMR) technology to study the change law of water content in the drywet cycle and explained the change mechanism of the pore in SWCC. Whereafter, some scholars studied SWCC under complex conditions such as dry-wet cycle and freeze-thaw cycle [22][23][24][25][26][27][28][29]. It can be seen that these studies are aimed at the expansive soil in a particular area, and the SWCCs of expansive soils in different areas have different laws under the external conditions such as dry-wet cycle and freezethaw cycle.…”

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

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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.

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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

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“…In addition to the conventional influencing factors, the stability of the mine should also consider the hazards caused by seasonal freezing and thawing. This freeze-thaw cycle will significantly change the connection structure among the tailings sand particles and directly affect the changes in physical and mechanical properties [40][41]. The construction of tailings projects in China often adopts the upstream method to build dams, but the upstream method is prone to geological disasters and dam break accidents.…”

Section: The Influence Of Freeze-thaw On the Stability Of Tailings Damsmentioning

confidence: 99%

Review of Research on Physical and Mechanical Properties and Engineering Application of Metal Tailings

Wang

Yan

Ke-min

et al. 2022

J. Phys.: Conf. Ser.

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Processing and storage requirements for metal residues are becoming stricter to achieve the carbon neutralization target. The physical and mechanical properties of tailings affect the stability of tailing dams. Metal tailings can be used as secondary resources, and it is easy to pollute the environment under poorly managed conditions. Therefore, it is necessary and urgent to reuse these deposits such as iron tailings, copper tailings, zinc tailings et al. This article discusses the current research on the mechanical properties of metal tailings and its engineering application. Based on previous research, it is pointed out that there still needs more attention on the mechanical properties of metal tailing sands, especially under different conditions like dry-wet, freeze-thaw, dynamic loads and large-scale application. In the future, research on the filling of metal tailings as roadbed and new building materials will be one of the directions to solve the problem of tailing pond accumulation.

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“…), but also the cooling conditions of the external environment (Q. Z. Wang et al., 2020; Z. Wen et al., 2012). On the other hand, direct analysis of unfrozen water volume change based on the principle of energy conservation and experimental means makes it difficult to resolve the critical nucleation state for the formation of stable nuclei in the pore solution of freezing soil (Wan et al., 2020; Wan, Liu, & Qiu, 2020).…”

Section: Introductionmentioning

confidence: 99%

Study of Supercooling Phenomena in Soil‐Water Systems Based on Nucleation Theory: Quantifying Supercooling Degree

Wang,

Li,

Cai

et al. 2023

Water Resources Research

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Determining the minimum supercooling temperature (Tsc) of unsaturated saline soils is the key scientific problem in cold‐region agricultural and engineering, and theoretical models with good predictability are urgently needed. This study establishes a framework for pore solution freezing nucleation in unsaturated saline soils, the chemical potential energy balance equation was established by determining phase transition driving force and potential energy barrier for the formation of stable crystal embryos. Finally, the physical model was constructed. By citing 46 sets of data from different researchers, the validity of the prediction results of this paper's model under different soil types and cooling rates is demonstrated, and the microscopic mechanism of supercooling occurring in the pore solution of positive permafrost is elucidated. The analysis found that electrolyte action restricts the free diffusion of molecules and promotes nucleation to occur, so that a maximum value of Tsc exists during the growth of salinity (in NaCl saline soils occurs at a solution concentration of 0.26 mol/L). Too fast cooling rate will lead to a lag in crystallization time and an increase in supercooling. The combined water content determines the Tsc when rc < 1 μm (pore size), and the effect of changes in water content and cooling rate on supercooling is more significant in small pores; the electrolyte concentration determines the Tsc when rc > 1 μm, Tsc‐max from concentration changes will be more significant in large pores. This study can provide theoretical reserves for controlling the freezing process of soils, studying the mechanism of freezing‐thawing hysteresis, and improving the related numerical calculation models.

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Effect of freeze-thaw on freezing point of a saline loess

Cited by 37 publications

References 32 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

Review of Research on Physical and Mechanical Properties and Engineering Application of Metal Tailings

Study of Supercooling Phenomena in Soil‐Water Systems Based on Nucleation Theory: Quantifying Supercooling Degree

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