Dynamic Damage Mechanism of Coal Wall in Deep Longwall Face

Figure 10

Relationship between the damage variable and the vibration number of the coal sample. (a) Disturbance from 0.5‰ to 1‰ and then to 0.5‰. (b) Disturbance from 0.5‰ to 1‰ and then to 1.5‰.

(a)

(b)