Abstract: The underground extraction of salt rock will form brine water filled abandoned caverns. Due to the creep of the salt rock, the abundant salt rock caverns will contract in volume and will result in the deformation of railway subgrade. The excessive deformation of the railway subgrades will affect the safe operation. An analytical solution that is based on ground deformation resulting from the contraction of a cylindrical salt rock cavity and Mogi Model is developed. This model can provide solutions of the development of deformation with time of the railway subgrade over abandoned salt rock mines.

Key words: Abandoned Salt Rock Mines, Subgrade Deformation, Mogi Model, Creep