ABSTRACT
Assume the state equations of joints to interaction of the rock blocks as follows (Barton 1986):
(T and σ are shear and normal stresses; R is slipping of edges of joints; Kt is shear rigidity; Kd is descend branch module; τp = σ tgϕ+ C, ϕ is internal friction angle; C is cohesion; Rp = τp/Kt).
