THM coupled model for simulating frost heave based on a new water film pressure criterion

WANG Zili; LI Jinfeng; TENG Jidong; ZHANG Sheng; SHENG Daichao

doi:10.11779/CJGE20220227

Volume 45 Issue 5

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Chinese Journal of Geotechnical Engineering > 2023 > 45(5): 997-1007. > DOI: 10.11779/CJGE20220227

WANG Zili, LI Jinfeng, TENG Jidong, ZHANG Sheng, SHENG Daichao. THM coupled model for simulating frost heave based on a new water film pressure criterion[J]. Chinese Journal of Geotechnical Engineering, 2023, 45(5): 997-1007. DOI: 10.11779/CJGE20220227

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THM coupled model for simulating frost heave based on a new water film pressure criterion

WANG Zili^1,,
LI Jinfeng¹,
TENG Jidong^{1, 2, ,},
ZHANG Sheng^{1, 2},
SHENG Daichao^{1, 2, 3}

1.
College of Civil Engineering, Central South University, Changsha 410075, China
2.
National Engineering Research Center of High-Speed Railway Construction Technology, Changsha 410075, China
3.
School of Civil and Environmental Engineering, University of Technology Sydney, Sydney 2007, Australia

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Received Date: March 03, 2022
Available Online: May 18, 2023

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Abstract

Abstract

The frost heave and thaw settlement are the main frost damage in cold areas, which are the complex coupling process of water, temperature and stress fields. In this study, a coupled thermal-hydraulic-mechanical model is developed based on the water film theory, in which the temperature and void ratio of soils are the input variables. The novelty of this model is that the frozen water film pressure is used as the criterion for the generation of ice lens. The driving force of water migration is newly defined, and the frost heave includes the pristine frost heave and the amount of ice segregation. The fully coupled model is numerically solved based on the Matlab and COMSOL Multiphysics, generating the results of soil temperature, moisture, stress and the layered ice lens. The simulated results are then compared with those of the laboratory freezing tests, which shows that they match quite well and verify the validity of the proposed model. The simulation indicates that temperature gradient can promote the frost heave, and the overburden pressure can attract more water to the freezing front but decrease the amount of the frost heave. In addition, both the hydraulic conductivity and the compressive modulus have positive effects on the frost heave. The proposed model provides a new approach to understand the frost heave.
- frozen soil,
- thermal-hydraulic-mechanical coupling,
- ice lens,
- water film theory,
- frost heave and thaw settlement

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THM coupled model for simulating frost heave based on a new water film pressure criterion

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