Figure 13. Principal stress magnitudes and compressive strength of the rock as a function of friction coefficient µ. S1 = maximum (vertical) stress value; S2 = horizontal maximum stress value; S3 = horizontal minimum stress value; C0 = mean computed compressive strength of the rock.

Figure 13. Principal stress magnitudes and compressive strength of the rock as a function of friction coefficient µ. S₁ = maximum (vertical) stress value; S₂ = horizontal maximum stress value; S₃ = horizontal minimum stress value; C₀ = mean computed compressive strength of the rock.