Deformation properties of rock during subcritical failure

1. An equation of the deformations of brittle rocks for complex load paths is obtained within the framework of the model of a fissured medium with allowance for crack growth. 2. The subcritical failure of rock specimens within a complex-stressed state is modeled numerically. It is shown that the zone of maximum failure is situated at the center of the deformed specimen, and the position of this region is virtually independent of the level of lateral pressure; this agrees with results of experimental investigations [3]. 3. The proposed model can be used to assess the stress-strain state of components of underground structures.