An Experimental Study of the Uniaxial Failure Behaviour of Rock-Coal Composite Samples with Pre-existing Cracks in the Coal

Figure 7

Typical failure models of composite samples. (a) A-1. (b) A-2. (c) A-3. (d) A-4. (e) A-5.

(a)

(b)

(c)

(d)

(e)