Abstract
In many tunnels, icicles and side-wall ices usually grow in cold climate. Ranges of icicle/side-wall ice formation from tunnel entrance are estimated by a multiple regression analysis and by a theoretical analysis considering heat convection/conduction between the tunnel-ground and the air flow. The calculated values well agree with the observed ones. The necessary length of anti-icicle treatment from tunnel entrance can be quantitatively determined according to several external conditions such as atmospheric phenomena, thermal conditions of the tunnel-ground and so on. Also the distribution of fluctuation amplitude of atmospheric temperature in a tunnel can be predicted by the theoretical results.
