Experiment and Failure Analysis of Rock-Like Material Affected by Different Excavation Depths

Figure 8

The stress-strain curves and crack coalescence process of specimen with single hole: (a) H = 20 mm, (b) H = 40 mm, (c) H = 60 mm, (d) H = 80 mm, and (e) H = 100 mm.

(a)

(b)

(c)

(d)

(e)