- Title
- A numerical model for heat and moisture migration in unsaturated freezing soil
- Creator
- Teng, J.; Sheng, D.; Liang, S.; Zhang, S.
- Relation
- 6th Asia-Pacific Conference on Unsaturated Soils. Unsaturated Soil Mechanics - from Theory to Practice: Proceedings of the 6th Asia-Pacific Conference on Unsaturated Soils (Guilin, China 23-26 October, 2015) p. 629-634
- Publisher Link
- http://dx.doi.org/10.1201/b19248-104
- Publisher
- CRC Press
- Resource Type
- conference paper
- Date
- 2016
- Description
- Taking the evaporation and condensation processes of water vapor into account, a new approach is put forward in this paper to model moisture and heat migration in unsaturated freezing soil. The predicted result of proposed model is compared with the experimental data of one-dimensional soil freezing test, it is shown that the proposed model is capable of effectively simulating the freezing process of unsaturated soil. Whereafter, parametric analysis is performed to clarify the role of vapor in soil freezing, the results show that vapor largely contributes to ice formation, occupying around 10%-60% of total water fluxes in an unsaturated and closed system. It is also shown that, total ice content and vapor flux percentage increases and decreases with the increase of initial water content, respectively. The higher the temperature gradient, the greater the vapor flux percentage, while the total ice content is insensitive to the temperature gradient. Peak values exist for the variations of total ice content and vapor flux against saturated hydraulic conductivity.
- Subject
- numerical model; heat; unsaturated freezing soils; modelling moisture
- Identifier
- http://hdl.handle.net/1959.13/1344814
- Identifier
- uon:29505
- Identifier
- ISBN:9781138029217
- Language
- eng
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