Rockburst in Sandstone Containing Elliptic Holes with Varying Axial Ratios

Figure 12

Classification of rockburst fragments for typical specimens with different axis ratios: (a) S-1-1, (b) S-1.25-1, (c) S-1.67-1, and (d) S-2.5-2 (unit: mm).

(a)

(b)

(c)

(d)