气候变化领域集成服务门户(CCPortal): Optimal reinforcement for improving the thermal performance of a permafrost tunnel based on coupled heat-mass transfer

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DOI	10.1016/j.tust.2021.104331
	Optimal reinforcement for improving the thermal performance of a permafrost tunnel based on coupled heat-mass transfer
	Li, Shuangyang; Li, Gen; Wang, Chong; Lai, Yuanming; Yang, Jiale; Zhang, Jing
通讯作者	Wang, C (通讯作者)，Lanzhou Univ, Sch Civil Engn & Mech, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2022
ISSN	0886-7798
EISSN	1878-4364
卷号	121
英文摘要	Over 80% of cold-region tunnels (CRTs) suffer from heavy periodic freeze-thaw actions, and therefore, their normal safe operations cannot be guaranteed. To mitigate freeze-thaw damage to CRTs, thermal insulation layers (TILs) were used to prevent external heat from penetrating the surrounding rock of CRTs. TILs were often laid between two linings of CRTs with a uniform thickness along the whole tunnel based on a single thermal conduction calculation or engineering analogy method, which was not only uneconomical but also unsafe. Thus, freeze-thaw damage still occurred at the entrance of the CRTs. To solve this engineering problem, we took the Fenghuoshan Tunnel in permafrost regions as an example and proposed a coupled heat-mass transfer model based on mass, energy and momentum conservation principles. The numerical model was indicated to be accurate by comparing the computed and monitored temperatures. The subsequent numerical results show that the heat and mass exchanges between the air inside the tunnel and tunnel wall make the air velocities vary with seasonal alternation, and therefore, temperatures of the surrounding permafrost exhibit evident differences on the temporal and spatial scales, according to which the most unfavorable position and time point are selected to design an optimal reinforcement for improving the thermal performance. Based on a series of heat-mass transfer simulations with different thicknesses of aerogel felt, an optimal changeable thickness of aerogel felt along the whole tunnel is obtained to improve the thermal performance of the Fenghuoshan Tunnel. If the permafrost tunnel is reinforced by this approach, the highest temperatures of the surrounding permafrost near the tunnel are less than approximately -0.44 degrees C, implying that the optimal reinforcement is effective and can control the freeze-thaw damage of the Fenghuoshan Tunnel. This study provides theoretical support for designing a safe and economical reinforcement on permafrost tunnels and understanding the coupled heat-mass transfer processes in tunnels.
关键词	REGION DESIGN
英文关键词	Cold-region tunnel (CRT); Heat-mass transfer; Freeze-thaw damage; Aerogel felt; Optimal reinforcement; Thermal performance
语种	英语
WOS研究方向	Construction & Building Technology ; Engineering
WOS类目	Construction & Building Technology ; Engineering, Civil
WOS记录号	WOS:000765020300002
来源期刊	TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254700
作者单位	[Li, Shuangyang; Li, Gen; Lai, Yuanming; Zhang, Jing] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Frozen Soil Engn, Lanzhou 730000, Gansu, Peoples R China; [Li, Gen] Highway Dev Ctr Yancheng, Yancheng 224008, Jiangsu, Peoples R China; [Wang, Chong] Lanzhou Univ, Sch Civil Engn & Mech, Lanzhou 730000, Gansu, Peoples R China; [Yang, Jiale] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730070, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Li, Shuangyang,Li, Gen,Wang, Chong,et al. Optimal reinforcement for improving the thermal performance of a permafrost tunnel based on coupled heat-mass transfer[J]. 中国科学院西北生态环境资源研究院,2022,121.
APA	Li, Shuangyang,Li, Gen,Wang, Chong,Lai, Yuanming,Yang, Jiale,&Zhang, Jing.(2022).Optimal reinforcement for improving the thermal performance of a permafrost tunnel based on coupled heat-mass transfer.TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY,121.
MLA	Li, Shuangyang,et al."Optimal reinforcement for improving the thermal performance of a permafrost tunnel based on coupled heat-mass transfer".TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 121(2022).