The Properties of a Coal Body and Prediction of Compound Coal-Rock Dynamic Disasters

Figure 1

A compound coal-rock dynamic disaster accident: no. 12 coal mine, Pingdingshan Coal Group Co., Ltd.: (a) damage on the roadway supports; (b) the piling of coal flow; (c) the piling of coal flow; (d) normal supports of roadway.

(a)

(b)

(c)

(d)