Water-vapor-heat behavior in a freezing unsaturated coarse-grained soil with a closed top

Bai, Ruiqiang; Lai, Yuanming; Zhang, Mingyi; Jian-qiang, Gao

doi:10.1016/j.coldregions.2018.08.007

Cited by 47 publications

(21 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the experimental observations indicated that the water content at the top of frozen samples significantly increased compared with the unfrozen samples, which agrees with the conclusions by Teng et al [12]. Besides, Gao et al [13] and Bai et al [14] conducted a series of frost heave tests of different fine particles and stated that the vapor transfer is essential to the frost heave of coarse-grained soils, especially in the condition of low water content.…”

Section: Introductionsupporting

confidence: 84%

Experimental Study of Water Transfer and Ice Accumulation in Freezing Soils under Different Conditions

Liang

Ma²,

Li³

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

A series of tests for water transfer and ice accumulation were conducted under different soil types and conditions of water supply method, temperature gradient, and initial water content; the influence of the above parameters on the efficiency of water and vapor transfer was investigated and discussed. The main conclusions drawn are as follows. First, due to the difference in permeability for different soil type, water (i.e., liquid water and vapor) transfers differently. The water (or ice) accumulated in the soils of calcareous sand, silty soil in Lanzhou (SSL), red clay in Changsha, and silty soil in Hohhot (SSH) under the top plate is 34.5%, 21.0%, 11.33%, and 26.7%, respectively. In addition, the water (or ice) accumulation is determined by the holding capacity of water. Second, the supply method of liquid water is more efficiently compared with that of vapor supply, with the water contents increasing to 60.5% and 57.3% for liquid water and vapor supply. Third, the larger the temperature gradient, the greater the water accumulation in the frozen area. The increased amount of water mass under different temperature boundary conditions is 227.9 g, 253.3 g, and 273.8 g, respectively. Finally, the initial water content in silty soil has a significant influence on water and vapor transfer. The increased amounts of water for the tests of the initial water content of 5%, 10%, and 15% are 282.6 g, 253.3 g, and 132.5 g, respectively. The smaller the initial water content, the greater the water transfer in the unfrozen zone and vapor transfer in the frozen zone.

show abstract

Section: Introductionsupporting

confidence: 84%

Experimental Study of Water Transfer and Ice Accumulation in Freezing Soils under Different Conditions

Liang

Ma²,

Li³

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…e "covering effects" were divided into two types by Teng et al [11]: the first type concerns liquid water migration, which often occurs in areas with a shallow groundwater level, and the second type concerns water vapor migration, which often occurs in soils with a low initial moisture content in arid and semiarid areas where the climate is characterized by high evaporation, low rainfall, and deep groundwater levels. Similarly, it was also highlighted by Bai et al [12] that under the influence of "covering effects," moisture migration was dominated by water vapor if there was low initial moisture content; on the contrary, it was mainly liquid water if there was high initial moisture content. Researchers [11,[13][14][15] conducted theoretical calculations and laboratory experiments on the two types of "covering effects," and concluded that the increase in the moisture content under the covering layer caused by the second type of "covering effects" was much greater than that caused by the first type of "covering effects."…”

Section: Introductionmentioning

confidence: 79%

“…Niu et al [8] also found this phenomenon that the water vapor will condense under the lid, releasing energy back into liquid water. However, unlike the water vapor migration under the freezing conditions [12,15,17,18], this part of liquid water did not completely return to the soil at the top but mostly adhered to the lid and the wall of the cylinder (as shown in Figure 9) due to the shrinkage of the soil in region I. Furthermore, the moisture sensors could not detect this part of moisture.…”

Section: Water Vapor Migration In the Loess Soil Column With Amentioning

confidence: 96%

“Covering Effects” under Diurnal Temperature Variations in Arid and Semiarid Areas

Liu

Mao

Cheng

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Covering effects" dominated by water vapor migration in arid and semiarid areas threaten the stability of engineering entities. To explore the "covering effects" dominated by water vapor migration under the influence of diurnal temperature variations, a series of one-side evaporation experiments were conducted. Characteristics of water vapor migration between the unsaturated loess soil column with and without a lid were compared in detail to illustrate the "covering effects" on water vapor migration, as were the effects of test time. Further, the characteristics of "covering effects" in loess and sand soil columns were compared. e results show that the "covering effects" formed in the loess soil column with a lid by cycling day and night temperature differences led water vapor to accumulate and condense beneath the lid. However, unlike the "covering effects" during freezing conditions that lead to a significant increase in the moisture content in the top layer, in this study, the moisture content in the top layer (0-8 cm) decreased. Although "soil lid" and the "soil covering effects" exist in both loess soil columns with and without lids, the "soil covering effects" for the former are much more obvious, and the moisture content in the upper part of the loess soil column (8-45 cm) shows a significant increase. By cycling day and night temperature differences, the "covering effects" or "soil covering effects" grew as the test time increased. Compared to the loess soil column, the "covering effects" in the sand soil column were extremely weak, and the moisture migration in the sand soil column was dominated by the downward movement liquid water. is paper illustrates the "covering effects" under the influence of diurnal temperature variations and reveals the mechanism of water vapor migration in subgrade soils in arid and semiarid areas. Figure 3: XRD patterns of test soils. (a) Loess. (b) Sand.

show abstract

“…Li et al [7] built a numerical heat-water-mechanics model based on energy, mass, and momentum conservation principles and then carried out an experiment in order to explain the heat-water-mechanics interaction mechanism of the freezing soil. Bai et al [8] conducted a series of one-side freezing experiments to illustrate moisture migration and frost heave mechanisms. He et al [9] established a coupled model for liquid water-vapor-heat migration, in which the phase changes of vapor-liquid and water-ice were considered.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Frost Heave of Concrete Lining Trapezoidal Channel Under an Open System

Lou

2020

Water

View full text Add to dashboard Cite

To study the distribution law of frost heave in base soil with a concrete lining structure and compound geomembrane, the coupled heat–moisture–stress, capillary action, and membrane water migration were considered, and multi-field coupling software was used to simulate the frost heaving of the channel. A 67-day frost heaving process of the foundation soil considering the change of groundwater level around a channel was also considered. The displacement fields at different positions on the base soil were obtained. The results showed that the frost heave was the largest at about one-third of the slope from the bottom of the channel, and the maximum is 8.243 cm. A compound geomembrane on the lower side of the lining can reduce the frost heaving of the foundation soil to some extent, and the maximum normal displacements of the lining along the slope and at the top of the channel decreased by 14.3% and 15.5% after adding the compound geomembrane.

show abstract

Water-vapor-heat behavior in a freezing unsaturated coarse-grained soil with a closed top

Cited by 47 publications

References 18 publications

Experimental Study of Water Transfer and Ice Accumulation in Freezing Soils under Different Conditions

Experimental Study of Water Transfer and Ice Accumulation in Freezing Soils under Different Conditions

“Covering Effects” under Diurnal Temperature Variations in Arid and Semiarid Areas

Numerical Simulation of Frost Heave of Concrete Lining Trapezoidal Channel Under an Open System

Contact Info

Product

Resources

About