Critical Conditions and Energy Transfer Characteristics of the Failure Process of Coal-Rock Combination Systems in Deep Mines

Figure 10

The failure modes of the coal–rock combination sample structures with different height ratios: (a) siltstone-coal height ratio 1 : 1; (b) siltstone-coal height ratio 1.5 : 1; (c) siltstone-coal height ratio 2 : 1.

(a)

(b)

(c)