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Published on: June 8, 2015
A novel decoupled model for water and heat coupling in frozen soil and numerical analysis
Peipei Chen1, Zhi Shang2, Ruisong Zhu2
1School of Science, Beijing University of Civil Engineering and Architecture, No. 1, Zhanlanguan Rd., Xicheng District, Beijing, 100044, China. chenpeipei@bucea.edu.cn.
Abstract:
A theoretical model for coupled water-heat processes in frozen soil, considering phase change effects, is developed based on energy and mass conservation principles and the soil freezing curve. Through mathematical derivation, a novel decoupled control equations are obtained to facilitate numerical implementation. The differential equation module of the COMSOL platform is redeveloped, and the decoupled water-heat coupling theory of frozen soil is embedded to realize numerical modeling. Based on in-situ monitoring data from cold region subgrade, the reliability and accuracy of numerical calculations were validated. Subsequently, the subgrade in a specific region of Northwestern China was chosen as the research subject, and an analysis was conducted on its water-heat migration response characteristics under surface conditions. The research results are expected to provide some technical support for engineering practice.
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