The frost damage of the tunnel in cold region seriously affects the normal operation and structural safety.In this paper

on the basis of the insulation of the drainage ditch of the tunnel in the cold area of Xining-Chengdu high-speed railway

a 2 Dnumerical model of the thermal insulation of the trench is established by using COMSOL finite element software.The heating load of the ditch is analyzed in combination with Xining meteorological data.Then considering the use of shallow geothermal energy by embedding the heat exchange pipe in the invert arch

a 3 Dmodel is established to design the tunnel inverted arch heat exchanger.The parameters including the buried pipe spacing

inlet water temperature and thermal conductivity of the surrounding rock are analyzed.The results show that energy tunnels can be used for insulation and antifreeze of tunnels in cold region under certain conditions.