Abstract
Heat transfer models were built for ordinary subgrade and phase change subgrade to reveal the temperature control and heat transfer laws of phase change subgrade in permafrost regions of the Qinghai‒Tibet Plateau. The variation characteristics of temperature and heat within the subgrade were analyzed by numerical simulation. The effects of phase change materials ’ phase change temperature, phase change enthalpy, and dosage on the temperature and heat of the subgrade bottom and the surface at 3.0 m height were studied. Research indicates that compared with ordinary subgrade, the phase change subgrade reduces the high temperature of the subgrade by phase change heat storage in the warm season and increases the low temperature of the subgrade by phase change heat release in the cold season. In the warm season, the heat transfer from the atmospheric environment to the phase change layer of the subgrade increases, while the heat transfer from the phase change layer of the subgrade to the subgrade foundation decreases. In the cold season, the heat transfer from the subgrade foundation to the phase change layer of the subgrade decreases, while the heat transfer from the phase change layer of the subgrade to the atmospheric environment increases. Through the cyclic alternation of warm and cold seasons, the heat of the subgrade in the warm season is transferred to the cold season, achieving the spatiotemporal redistribution of heat within the subgrade. Under the phase change temperature of 1℃, phase change enthalpy of 300 J/g, and a dosage of 15%, the annual net heat release of the subgrade foundation is reduced by 29.13 MJ/m², and the annual net heat release of the surface at 3.0 m height of the subgrade is increased by 18.62 MJ/m². This indicates that the thermal barrier effect on the foundation is greater than the heat dissipation effect on the subgrade, thus effectively improving thermal insulation performance of the subgrade.
Publication Date
8-16-2026
DOI
10.14048/j.issn.1671-2579.2026.04.004
First Page
31
Last Page
41
Submission Date
August 2026
Recommended Citation
Zijun, Li; Mingtian, Wang; Nanlu, Zhao; Huilong, Zhao; and Ruoyu, Hao
(2026)
"Regulation of temperature control and heat transfer characteristics in permafrost subgrade by phase change materials,"
Journal of China & Foreign Highway: Vol. 46:
Iss.
4, Article 4.
DOI: 10.14048/j.issn.1671-2579.2026.04.004
Available at:
https://zwgl1980.csust.edu.cn/journal/vol46/iss4/4
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