Experimental study on thermal performance of the tunnel with active heating system in cold region

In the cold region, the seasonal freezing and thawing for the pore water in the rock or the soil are very likely to occur repeatedly. Engineering practices show that: in the service period, more than 80% of the tunnels have different degrees of frost damage. Hence, the frost-resisting problem must be taken into account. In this paper, the Jinzhangzi tunnel was chosen as a target project and a serious of the thermal tests were carried out. Experimental result the proposed heating system can suppress occurence of the frost damage for the target tunnel.