Application of the Segregation Potential Model to Freezing Soil in a Closed System
Previous studies have shown that an accurate prediction of frost heaves largely depends on the pore water pressure and hydraulic conductivity of frozen fringes, which are difficult to determine. The segregation potential model can avoid this problem; however, the conventional segregation potential i...
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| Format: | Article |
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MDPI AG
2020-08-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/9/2418 |
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| author | Xiyan Zhang Yu Sheng Long Huang Xubin Huang Binbin He |
| author_facet | Xiyan Zhang Yu Sheng Long Huang Xubin Huang Binbin He |
| author_sort | Xiyan Zhang |
| collection | DOAJ |
| description | Previous studies have shown that an accurate prediction of frost heaves largely depends on the pore water pressure and hydraulic conductivity of frozen fringes, which are difficult to determine. The segregation potential model can avoid this problem; however, the conventional segregation potential is considered to be approximately unchanged at a steady state and only valid in an open system without dehydration in the unfrozen zone. Based on Darcy’s law and the conventional segregation potential, the segregation potential was expressed as a function of the pore water pressure at the base of the ice lens, the pore water pressure at the freezing front, the freezing temperature, the segregation freezing temperature and the hydraulic conductivity of the frozen fringe. This expression indicates that the segregation potential under quasi-steady-state conditions is not a constant in a closed system, since the pore water pressure at the freezing front varies with the freezing time owing to the dehydration of the unfrozen zone, and that when the pore water pressure at the freezing front is equal to that at the base of the ice lens, the water migration and frost heave will be terminated. To analyze the possibility of applying the segregation potential model in a closed system, a series of one-sided frost heave tests under external pressure in a closed system were carried out in a laboratory, and the existing frost heaving test data from the literature were also analyzed. The results indicate that the calculated frost heave was close to the tested data, which shows the applicability of the model in a closed system. In addition, the results show the rationality of calculating the segregation potential from the frost heaving test by comparing the potential with that calculated from the numerical simulation results. This study attempted to extend the segregation potential model to freezing soil in a closed system and is significant to the study of frost heaves. |
| first_indexed | 2024-03-10T16:44:41Z |
| format | Article |
| id | doaj.art-2dc47b9bd159423ab8f382f5d0a88b42 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T16:44:41Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-2dc47b9bd159423ab8f382f5d0a88b422023-11-20T11:43:47ZengMDPI AGWater2073-44412020-08-01129241810.3390/w12092418Application of the Segregation Potential Model to Freezing Soil in a Closed SystemXiyan Zhang0Yu Sheng1Long Huang2Xubin Huang3Binbin He4Stage Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences; Lanzhou 730000, ChinaStage Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences; Lanzhou 730000, ChinaStage Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences; Lanzhou 730000, ChinaStage Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences; Lanzhou 730000, ChinaStage Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences; Lanzhou 730000, ChinaPrevious studies have shown that an accurate prediction of frost heaves largely depends on the pore water pressure and hydraulic conductivity of frozen fringes, which are difficult to determine. The segregation potential model can avoid this problem; however, the conventional segregation potential is considered to be approximately unchanged at a steady state and only valid in an open system without dehydration in the unfrozen zone. Based on Darcy’s law and the conventional segregation potential, the segregation potential was expressed as a function of the pore water pressure at the base of the ice lens, the pore water pressure at the freezing front, the freezing temperature, the segregation freezing temperature and the hydraulic conductivity of the frozen fringe. This expression indicates that the segregation potential under quasi-steady-state conditions is not a constant in a closed system, since the pore water pressure at the freezing front varies with the freezing time owing to the dehydration of the unfrozen zone, and that when the pore water pressure at the freezing front is equal to that at the base of the ice lens, the water migration and frost heave will be terminated. To analyze the possibility of applying the segregation potential model in a closed system, a series of one-sided frost heave tests under external pressure in a closed system were carried out in a laboratory, and the existing frost heaving test data from the literature were also analyzed. The results indicate that the calculated frost heave was close to the tested data, which shows the applicability of the model in a closed system. In addition, the results show the rationality of calculating the segregation potential from the frost heaving test by comparing the potential with that calculated from the numerical simulation results. This study attempted to extend the segregation potential model to freezing soil in a closed system and is significant to the study of frost heaves.https://www.mdpi.com/2073-4441/12/9/2418frost heavesegregation potentialexternal pressureclosed system |
| spellingShingle | Xiyan Zhang Yu Sheng Long Huang Xubin Huang Binbin He Application of the Segregation Potential Model to Freezing Soil in a Closed System Water frost heave segregation potential external pressure closed system |
| title | Application of the Segregation Potential Model to Freezing Soil in a Closed System |
| title_full | Application of the Segregation Potential Model to Freezing Soil in a Closed System |
| title_fullStr | Application of the Segregation Potential Model to Freezing Soil in a Closed System |
| title_full_unstemmed | Application of the Segregation Potential Model to Freezing Soil in a Closed System |
| title_short | Application of the Segregation Potential Model to Freezing Soil in a Closed System |
| title_sort | application of the segregation potential model to freezing soil in a closed system |
| topic | frost heave segregation potential external pressure closed system |
| url | https://www.mdpi.com/2073-4441/12/9/2418 |
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