基于相变蓄能的寒区隧道围岩–衬砌控温试验研究

doi:10.3724/1000-6915.jrme.2024.0856

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Abstract Maintaining surrounding rock thermal insulation is crucial for preventing frost damage in cold-region tunnel engineering. Active thermal balance preservation in surrounding rock holds critical importance for frost damage prevention in cold-region tunnels. This study proposes the approach of frost damage prevention by phase change energy storage practively. The temperature control system for tunnel surrounding rocks was established using phase change materials (PCMs), developing phase-field model for cold-storage heat-retention PCMs and deriving mathematical equations for solid-liquid phase transition alongside an optimal phase change temperature calculation formula. Following the principles of maximum latent heat and prolonged phase change duration, PCM material suitable for cold-region tunnel engineering was developed. Experimental investigations were conducted to evaluate the thermal properties, durability, and temperature regulation performance of cold-storage heat-retention PCMs under freeze-thaw conditions. Tests revealed that: (1) The developed PCMs, composed of decanoic acid and decanol in a mass ratio of 55.39∶107.38 with latent heat of 231.17 J/g, exhibiting superior heat storage performance among low-temperature phase change materials. (2) DSC and temperature scanning tests on cold-storage heat-retention PCMs revealed single-peak exothermic/endothermic curves during freeze-thaw cycles, confirming stable eutectic formation and consistent thermal storage performance. The prolonged heat storage/release phases demonstrated significant peak-shaving and valley-filling effects, effectively mitigating frost heave and thawing-induced damage in cold region engineering. (3) After 300 phase-change cycles, the FTIR spectral profiles and DSC curves remained consistent. The developed PCMs demonstrate maximum phase transition temperature deviation of 0.08 ℃, latent heat variation ＜5%, and super-cooling degree ＜5 ℃, confirming excellent thermal cycling stability and durability. (4) The temperature control efficacy of PCMs is influenced by temperature gradient. Ensuring the full utilization of phase change materials is the key to maximizing its phase change potential in freeze-thaw environments. Therefore, appropriate PCMs thickness selection based on local climate conditions proves essential for temperature regulation. The relevant research results provide valuable theoretical insights and practical guidance for the development of frost damage prevention and thermal insulation technologies in cold region tunnel engineering.

Key words： tunnel engineering tunnel in cold region phase change energy storage cold-storage heat-retention temperature control test freeze-thaw cycle temperature gradient

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	Articles by authors
	LIU Hui1
	YANG Gengshe1
	SHEN Yanjun2
	3
	YE Wanjun1
	DING Xiao4
	HAN Senlei1
	LIANG Bo1
	DAI Xinyue1
	JIA Hailiang1

Cite this article:

LIU Hui1,YANG Gengshe1,SHEN Yanjun2, et al. Experimental investigation on temperature control of surrounding rock-lining of tunnel in cold region based on phase change energy storage[J]. , 2025, 44(7): 1752-1766.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0856 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I7/1752

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