Estimation of Atmospheric Condition for Designing of Frost Damage and Frost Heave Prevention in Tunnel

Abstract

In cold climate tunnels, icicles and sidewall ices grow at the lining surface, and frost heaves of rocks occur at the back of the lining. For a purpose of these frost damage and frost heave of the tunnel, an adiabatic icicle prevention work has been provided in many railway tunnels.
To design the icicle prevention work, it is desirable to estimate reasonably atmospheric condition at the outside of tunnel.
This paper deals with a statistical estimation method of the atmospheric condition such as yearly mean air temperature, yearly amplitude and daily amplitude, which are based on an exreme distribution analysis.