Research of Transitional Failure Mode as Damage Evolution in Rock Wall

Figure 4

Photographs of failed specimens of Mons chalk. A transition of failure patterns with increase in radial stress. Specimen (a) shows axial splitting observed in uniaxial compression test, σ₃ = 0; specimen (b) exhibits a shear band with angle of 67° from σ₃ = 1.5 MPa; specimen (c) also illustrates a shear band with angle of 55° from σ₃ = 2.5 MPa; specimen (d) shows a transitional failure plane with angle of 36° from σ₃ = 5 MPa; and stage (e) clearly shows a compaction band under σ₃ = 10 MPa [21].

(a)

(b)

(c)

(d)

(e)