Research on anti-freezing and thermal insulation measures of tunnel in cold area

Abstract

To solve the problem of freezing damage in tunnels in cold areas, based on the investigation and analysis of the existing tunnel insulation measures in cold regions, the Wunvfeng Tunnel is used as a supporting project. First, indoor tests are conducted to analyze the insulation performance, insulation effect and influencing factors of the cold insulation layer. The moisture-proof performance has a great influence on the cold-proof and thermal insulation effect. From the test results, it can be seen that when the thermal insulation layer is immersed in water, its thermal insulation performance decreases rapidly. The temperature behind the thermal insulation layer decreases rapidly with time, and the temperature quickly drops below zero without convergence, trend, the loss of cold-proof and thermal insulation performance. Then, through numerical simulation, the thermal insulation effect of different insulation layer laying methods (intermediate method, double layer method and surface method) was compared and analyzed, and it was concluded that under the same thickness of insulation layer, the better insulation layer laying method was surface method. It also shows that the closer the insulation layer is to the interface between the surrounding rock and the ambient air, the better its insulation effect.