Mechanical Mechanism and Propagation Law of Fissure-Tip Cracks of Large-Size Rock Specimens with Two Precut Fissures

Figure 6

Stress-time curves and spatial distribution of AE events at different stress levels: (a) A-1, (b) A-2, (c) B-1, (d) B-2, (e) C-1, and (f) C-2.

(a)

(b)

(c)

(d)

(e)

(f)