抄録
In many tunnels, icicles and side-wall ices usually grow, and frost heaves at back of lining occur. This paper deals with some actual states of frost penetration depth in railway tunnels and its simulation analysis. First, daily fluctuations and maximum values of frost penetration depth are described about a few actual tunnels. Next, they are simulated by a tunnel ground model which is a one-dimensional nonsteady state heat convection/conduction difference equation considering the latent heat. The analytical results agree with the measured ones. Then using the tunnel ground model, behaviors of daily fluctuations, etc. of frost penetration depth are analysed against a yearly periodic change of atmospheric temperature in tunnel.
