Abstract
Solving the high temperature problem during the construction of high geothermal tunnel is of great significance to ensure the safety of workers, improve production efficiency and improve structural safety. Therefore, this paper innovatively establishes a high temperature comprehensive control system of high geothermal tunnel combining high-temperature treatment in tunnel and high-temperature heat source insulation. Based on the highway tunnel with the highest temperature in China—the Nige Tunnel, the temperature field in tunnel with various cooling measures under different surrounding rock temperatures and the temperature variation of lining structure with different thermal insulation methods and thicknesses are studied by numerical simulation. Furthermore, the selection standard of cooling measures, the laying method and the thickness of thermal insulation layer (TIL) are proposed. In the Nige Tunnel, the high temperature comprehensive control system and cooling measures are adopted based on on-site temperature monitoring, so that the temperature in the tunnel can meet the construction requirements and ensure the safety and efficiency of high geothermal tunnel construction.
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