[en] The thermal load of a saltdome after ultimate disposal of radioactive wastes leads to a direct heat effect, the temperature distribution, as well as a indirect heat effect, the stress/strain distribution. In the past essentially the temperature distribution had been calculated. In the mean time the thermomechanical effects of the heat dissipation will become more and more important. Therefore, the material behaviour of rock salt will be discussed and a simple mathematical description based on a rheological model will be shown. Furthermore, first results of a near field and a fare field problem in simple geometry show that the stress distribution in some parts of the calculated region is very similar to the temperature distribution. To get reliable results much researches on the material model as well as on computer codes will have to be done. (Auth.)