The mathematical model of rock massive is developed taking into account its internal structure, anisotropy, softening, accumulation and release elastic energy. Effective elastic modules of grain structure are determined by boundary integral equation method using tensor of fundamental solutions. The diagram of slips between grains includes the softening stage. The numerical simulation of deformation process of the rock pillar is presented.

Key words: rock, structure, anisotropy, deformations, pillar, stability.