Thermal Insulation Performance Affected by Thermal Physical Parameters of Thermal Insulation Layer in Active Thermal Insulation Tunnel

In order to obtain the influence law of thermal property parameters of thermal insulation layer on thermal insulation effect of active thermal insulation roadway, a gas-solid coupling heat transfer model of airflow and surrounding rock in active thermal insulation roadway was established. The thermophysical parameters of 8 materials for building thermal insulation were selected for numerical simulation. The results show that the heat dissipation of roadway surrounding rock has a positive exponential relationship with ventilation time, regardless of whether the roadway is constructed with thermal insulation layer or not; after the thermal insulation layer is constructed in the roadway, there is a negative power exponential relationship between the heat loss of the reduced surrounding rock and the thermal conductivity of the thermal insulation layer, the decreasing value of airflow temperature at the same location has a negative exponential relationship with the thermal conductivity of the thermal insulation layer. Coefficient of heat conduction of thermal insulation layer is the main factor that affects its heat insulation effect, and the smaller the thermal conductivity of the thermal insulation layer, the more obvious the thermal insulation effect.