  Based on the finite element method formulated in three dimensions, a selected
area of the salt mine has been modeled, embracing totally 2 separated,
historically valuable mine rooms. The results of the computer simulations
permitted elastic-viscous rock mass stability analyses identifying the areas
being more susceptible to damage, presently and in a far future. The
geomechanical risk assessment procedure utilized so called safety margins which
were defined as a distance between the point characterized by the actual local
strain/stress conditions and the instability (limit) surface(s) which location
in the 3D stress/strain space could be determined using the well-known strength
theories,
