Water and salt migration mechanisms of saturated chloride clay during freeze-thaw in an open system

Liu, Jianpeng; Yang, Ping; Yang, Zhaohui

doi:10.1016/j.coldregions.2021.103277

Cited by 40 publications

(9 citation statements)

References 49 publications

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“…The green dotted curves in figure 7 show the effect of soil salinity on the rate of frost heave in the buried pipeline experiment for the case k s = 0.4, D 0 = 10 −9 m 2 /s and various c 0 , with other parameters the same as in Section 6.2. A moderate salt concentration of 3.5 g/L significantly decreases the rate of frost heave, in qualitative agreement with the observations of Sheeran and Young [76,77], Chamberlain [48], Velsovskij et al [78] and Liu et al [79].…”

Section: Saline Soilssupporting

confidence: 90%

Effect of particle trapping on frost heaving soils

Peppin¹

2022

Preprint

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A model of freezing soils is developed that accounts for the dependence of the frost heave rate on particle trapping. At sufficiently low cooling rates the soil experiences primary frost heave with a single growing ice lens that rejects all soil particles. At higher cooling rates ice lenses start to engulf the largest soil particles and the rate of segregation heave is reduced. At the highest freezing rates all particles are engulfed by the ice and the pore water freezes in situ. A new kinetic expression for the segregation potential of the soil is obtained that accounts for particle trapping. Using this expression a simple transient frost heave model is developed and compared with experimental data.

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Section: Saline Soilssupporting

confidence: 90%

Effect of particle trapping on frost heaving soils

Peppin¹

2022

Preprint

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“…This study is based on nonfreeze soil water characteristic curve, selected the VG and BC model with RETC software for calculation, the results showed that the two models could obtain the initial soil water content, but residual water content has more difference, and water migration has impact on soil water characteristic curve solution during freezing-thawing process (Liu et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…The migration of soil salts under the mulching condition is more complicated and has a certain relationship with water migration in the freezing and thawing process, and the increase of unfreeze water will cause the change of salts (Liu et al, 2021;Wang et al, 2022). The EC values at 5cm depth decreased compared with before freezing, while the EC value changes smaller, and mulching weaken soil salts migration effectively.…”

Section: Soil Salt Migration Mechanism During Freezing-thawingmentioning

confidence: 99%

“…Soil salt migration is in uenced by moisture migration during freezing-thawing process (Liu et al, 2021), and the mulching affects soil temperature, resulting in soil moisture migration and redistribution. Neither soil moisture nor salt migration occurs in a directional manner, and this migration exists in both positive and negative migration during the freezing-thawing process.…”

Section: Soil Salt Migration Mechanism During Freezing-thawingmentioning

confidence: 99%

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The Study of Migration Mechanism of Soil Water and Salinity during Freezing-thawing Process of Double Ridges Mulching

Zhao

2022

Preprint

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The freezing and thawing process caused soil water and salinity migration from depth to surface that led to massive evaporation and soil salination in spring. Ridges mulching is a very efficient method not only improved soil temperature, restrain evaporation, collected precipitation, but do not affected cultivation. Soil water characteristic curves reveal the relationship of soil water and soil suction, has very important meaning to research soil water migration. The study selected two kinds side mulching methods and one control as objects, the two kinds side mulching methods was weave overlay plastic film and weave, one control was bare soil. van Genuchten (VG) and Brooks and Corey (BC) models were adopted to simulated soil water characteristic curve in the freezing-thawing process. The result showed that VG model has higher simulation accuracy, and the coefficients of determination R2 are above 0.9 and nRMSE are less than 10% for BS, W and FW simulation tests except for W and FW conditions of 5 cm. The soil temperature from 0 to 30 cm depth during freezing was highest in FW, second in W, and lowest in BS. Soil water and salinity have migrated during freezing-thawing process, compared with before freezing, soil water increased from 30 cm depth under bare soil conditions and from 15 cm under mulching cover conditions after the end of freezing-thawing, and the same pattern for soil EC, from 15cm depth under mulching conditions soil EC values increased, the EC values at 15cm depth under bare soil conditions still decreasing. The study achievement can provide a reference for the study of water-salinity migration and water characteristic curves during freezing and thawing of soils in arid and cold regions, and also provide a theoretical basis for soil water conservation, suppression of evaporation from farmland and salinity accumulation in topsoil.

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“…Lin et al [12] conducted long-term and onedimensional seepage simulation experiments for loess soils and found that salt transport was influenced by the water content and soil dry density. Liu et al [13] performed water-salt migration experiments under unidirectional freezing for saline soils with different chloride contents and found that the lower the salt content, the farther the location of the freezing peak was from the cold end. The above scholars have studied the water-salt migration patterns within saline soils, but they are limited to saline soils with low salinity, and the existing studies are not sufficient for the water-salt migration patterns in saline soils with high salinity.…”

Section: Introductionmentioning

confidence: 99%

Impact of Cooling on Water and Salt Migration of High-Chlorine Saline Soils

Tian

Zhang

et al. 2021

Geofluids

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Secondary salinization is a common problem in saline soil projects. In order to grasp the mechanism of water and salt migration of high-chlorine saline soil during the cooling process, the saline soils along the Qarhan-Golmud Highway in the Qinghai-Tibet Plateau were selected as test samples. Firstly, the basic physical parameter test and the soluble salt chemical experiment were carried out and obtained liquid and plastic limits, dry density, etc. Secondly, freezing temperature experiments and water-salt migration experiments under one-way cooling conditions were conducted according to the actual environmental conditions, and after the temperature gradient line of the soil sample was stable, water content and labile salt chemistry experiments were conducted to obtain the distribution of water and salt contents of soil samples. Finally, the effect of crystallization-water phase transition on water and salt migration and the effect of chloride salt on the temperature of crystallization-water phase transition were considered, and a mathematical model applicable to the water and salt migration of highly chlorinated saline soils under the effect of unidirectional cooling was established and solved with COMSOL Multiphysics software, and the correctness of the model was verified by comparing the simulation results with the experimental results. The study found that (1) during the one-way cooling process, both water and salt showed a tendency to migrate to the cold end. The MC (saline soil with medium chlorine content) with an initial water content of 16.9% and Cl− content of 3.373% was measured to reach a 17.6% water content and 3.76% Cl− content at the cold (top) end after the experiment. The HC (saline soil with high chlorine content) with an initial water content of 6.6% and Cl− content of 17.928% was measured to reach a 6.83% water content and 18.8% Cl− content after the experiment and (2) after the one-way cooling experiment of the MC, the water content at a distance of 1–2 cm from the cold end has abrupt changes, which may be caused by a small amount of crystallization—water phase transition at this location. At the same time, according to the temperature change graph during the cooling process, the phase change temperature was set to −9°C in the numerical simulation process to match the experimental results.

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Water and salt migration mechanisms of saturated chloride clay during freeze-thaw in an open system

Cited by 40 publications

References 49 publications

Effect of particle trapping on frost heaving soils

Effect of particle trapping on frost heaving soils

The Study of Migration Mechanism of Soil Water and Salinity during Freezing-thawing Process of Double Ridges Mulching

Impact of Cooling on Water and Salt Migration of High-Chlorine Saline Soils

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