Analysis of hydrothermal coupling response characteristics of frozen soil subgrade of high-speed railway in cold region

CHEN Peipei; SHANG Zhi; WANG Manqi; QI Linghao; YANG Guangchang; WU Nan

doi:10.16030/j.cnki.issn.1000-3665.202404048

2025 Vol. 52, No. 3

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CHEN Peipei, SHANG Zhi, WANG Manqi, QI Linghao, YANG Guangchang, WU Nan. Analysis of hydrothermal coupling response characteristics of frozen soil subgrade of high-speed railway in cold region[J]. Hydrogeology & Engineering Geology, 2025, 52(3): 153-162. doi: 10.16030/j.cnki.issn.1000-3665.202404048

Citation:

CHEN Peipei, SHANG Zhi, WANG Manqi, QI Linghao, YANG Guangchang, WU Nan. Analysis of hydrothermal coupling response characteristics of frozen soil subgrade of high-speed railway in cold region[J]. Hydrogeology & Engineering Geology, 2025, 52(3): 153-162. doi: 10.16030/j.cnki.issn.1000-3665.202404048

Analysis of hydrothermal coupling response characteristics of frozen soil subgrade of high-speed railway in cold region

1.
School of Science, Beijing University of Civil Engineering and Architecture, Beijing　100044, China
2.
School of Civil and Traffic Engineering, Beijing University of Civil Engineering and Architecture, Beijing,　100044, China
3.
Department of Civil Engineering, University of Science and Technology Beijing, Beijing　100083, China
4.
College of Smart Manufacturing and Intelligent Transportation, Suzhou City University, Suzhou, Jiangsu　215104, China

Received Date: 22 April 2024

Revised Date: 27 June 2024

Publish Date: 15 May 2025

Abstract

Abstract

Coupled heat and water transfer in frozen soil presents certain challenges for numerical computation due to the strong coupling nature of its control equations, thereby affecting their application in engineering practice. Based on the principles of energy conservation, mass conservation, and the soil freezing curve, a theoretical model for the coupled heat and water transfer in frozen soil, considering phase change effects, was proposed. Subsequently, decoupled control equations were derived through mathematical deduction to optimize numerical solutions. Numerical modeling of the coupled water and heat transfer process in frozen soil was implemented through secondary development on the COMSOL platform. The measured data from the subgrade of the Lanxin Passenger Dedicated Line were used for numerical validation, and numerical analysis was conducted under fitted surface boundary conditions. The analysis indicates the numerical solutions of temperature and moisture content at different depth exhibit good agreement with the measured values, thereby validating the reliability of the decoupled theoretical model for coupled heat and water transfer in frozen soil. The soil layer has a “peak damping” effect on the amplitude of periodic variations in temperature and moisture content, and the sine wave curves of temperature and moisture content at different depth present certain phase lag phenomena. Among these, temperature amplitude attenuation and phase lag are caused by energy dissipation in the heat conduction process, while similar phenomena in moisture content curves may be due to phase changes between ice and water altering soil permeability. The temperature contour lines near the surface are denser, while those in the deeper soil layers are sparser. The surface layer of the roadbed is more susceptible to external temperature fluctuations. During summer, the temperature gradually decreases from top to bottom, whereas in winter, the temperature gradually increases from top to bottom. The moisture content in the subgrade section increases with depth, reaching a peak near the interface between the cemented coarse-grained soil material and the fill material, highlighting the influence of material interfaces on moisture migration, and then gradually decreases with increasing depth. The research findings provide technical support for the construction of engineering projects such as roadbeds in cold regions.
- cold-region subgrade /
- hydrothermal coupling theory /
- decoupling calculation /
- numerical analysis

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References

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