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Study of Thermal Insulation Effects of Off-wall Corrugated Steel Plate Liner Applied in Tunnels in the Seasonally Frozen Region
(1. School of Civil Engineering, North China University of Technology, Beijing 100144; 2. Department of Civil Engineering, Hebei Jiaotong Vocational and Technical College, Shijiazhuang 050091; 3. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031)
Abstract In order to prevent and control frozen damage that frequently occurs in tunnels in the seasonably frozen region, a new thermal insulation liner composed of off-wall corrugated steel plates is developed, which is characterized by easy construction, reliable waterproof performance, resistance to concrete chipping, an increase in the service life of polyurethane and so on. Numerical simulation is performed to study the temperature field of the tunnels installed with thermal insulation liner composed of off-wall corrugated steel plates in the seasonably frozen region and its thermal insulation effect. The results show that the installation of the new thermal insulation liner composed of off-wall corrugated steel plates in tunnels in the seasonably frozen region can prevent the impact of cold air on the lining structure, the area of surrounding rocks with positive temperature is increased, and the tunnel frost line moves forward from the surrounding rock position at 0.48 m away from the lining to the thermal insulation liner, effectively preventing the occurrence of frozen damage of tunnels in the seasonably frozen region; the thermal insulation effect of wall-mounted polyurethane thermal insulation layer of tunnels in the seasonably frozen region is 89.90%~96.43%, and the thermal insulation effect of new thermal insulation liner composed of off-wall corrugated steel plates is 101.94%~107.14%, with better thermal insulation effect than that of the former.
Abstract：
In order to prevent and control frozen damage that frequently occurs in tunnels in the seasonably frozen region, a new thermal insulation liner composed of off-wall corrugated steel plates is developed, which is characterized by easy construction, reliable waterproof performance, resistance to concrete chipping, an increase in the service life of polyurethane and so on. Numerical simulation is performed to study the temperature field of the tunnels installed with thermal insulation liner composed of off-wall corrugated steel plates in the seasonably frozen region and its thermal insulation effect. The results show that the installation of the new thermal insulation liner composed of off-wall corrugated steel plates in tunnels in the seasonably frozen region can prevent the impact of cold air on the lining structure, the area of surrounding rocks with positive temperature is increased, and the tunnel frost line moves forward from the surrounding rock position at 0.48 m away from the lining to the thermal insulation liner, effectively preventing the occurrence of frozen damage of tunnels in the seasonably frozen region; the thermal insulation effect of wall-mounted polyurethane thermal insulation layer of tunnels in the seasonably frozen region is 89.90%~96.43%, and the thermal insulation effect of new thermal insulation liner composed of off-wall corrugated steel plates is 101.94%~107.14%, with better thermal insulation effect than that of the former.
CUI Guangyao1 JIANG Mengxin1 WANG Daoyuan2,
3 WANG Xuelai1
.Study of Thermal Insulation Effects of Off-wall Corrugated Steel Plate Liner Applied in Tunnels in the Seasonally Frozen Region[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(2): 258-263
2022, Vol. 59 