Research on the Temperature Field Variation Law and Insulation Layer Parameter Optimization of Tunnels in Cold Regions
The construction of tunnels in cold regions faces unique technical challenges,including the significant impact of low-temperature environments on the temperature field inside the tunnel.The temperature changes inside the tunnel not only affect the safety of construction and operation stages,but also directly affect the long-term stability and service life of the tunnel structure.Therefore,this article adopts a combination of on-site measurement and numerical simulation to explore the spatiotemporal variation law of the temperature field of tunnel surrounding rock in cold regions,and analyzes the influence of different insulation layer materials,length,and thickness on the insulation effect.The results indicate that the temperature distribution inside the surrounding rock closer to the tunnel entrance is more severely affected by the low temperature outside the tunnel.The internal temperature of the surrounding rock increases continuously with the increase of radial depth,but the magnitude of its increase decreases continuously.When the rigid polyurethane foam with the smallest thermal conductivity is used and its thickness is 5 cm,length is 850 m,it can effectively ensure that the tunnel lining structure will not be frozen.
cold region tunneltemperature fieldinsulation layerparameter optimization
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