Dynamic Damage Mechanism of Coal Wall in Deep Longwall Face

Figure 8

Diagram of stress-strain relationship under different loading paths. (a, b) Disturbance from 0.5‰ to 1‰ and then to 0.5‰. (c, d) Disturbance from 0.5‰ to 1‰ and then to 1.5‰.

(a)

(b)

(c)

(d)