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A hydrothermal coupling model for permafrost subgrade considering temperature gradient and its application
Jianqing Jia1, Zeqing He2, Victor O Tenorio3
1School of Traffic and Transportation, Lanzhou Jiaotong University, Lanzhou, 730070, China. 19427431@qq.com.
Scientific Reports
|January 13, 2025
Summary
This study models frozen soil's hydrothermal processes, incorporating temperature-dependent permeability. The findings improve predictions of temperature and moisture fields in cold region road subgrades, crucial for infrastructure resilience.
Area of Science:
- Geotechnical Engineering
- Environmental Science
- Thermodynamics
Background:
- Frozen soil properties are critical for infrastructure in cold regions.
- Soil permeability and temperature significantly influence water movement and thermal distribution.
- Accurate modeling of frozen soil requires accounting for dynamic variations in permeability.
Purpose of the Study:
- To investigate the dynamic variation of the soil permeability coefficient with temperature.
- To establish and validate a hydrothermal coupling equation for frozen soil.
- To analyze the temperature and moisture fields of a cold region road subgrade under revised IPCC boundary conditions.
Main Methods:
- Defining soil permeability as a piecewise function of temperature.
- Establishing a hydrothermal coupling equation.
- Simulating the soil freezing process using COMSOL software with secondary development.
- Validating simulation accuracy against experimental results.
- Applying IPCC-derived temperature boundary conditions to a road subgrade model.
Main Results:
- The model shows improved accuracy, especially for soil column heights of 0-3 cm and 8-15 cm.
- A significant temperature gradient exists within 2 m of the subgrade slope; temperature stabilizes beyond this depth, indicating permafrost.
- Soil moisture content exhibits a complex pattern with depth, peaking at -0.5 m (13%) before stabilizing.
Conclusions:
- Accounting for temperature-dependent permeability enhances the accuracy of frozen soil hydrothermal simulations.
- The study provides insights into the thermal and moisture dynamics of road subgrades in cold regions.
- Findings are relevant for designing and maintaining infrastructure in permafrost environments, considering climate change projections.
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