Failure Characteristics and Deformation Control Methods of the Bottom Drum of Roadways during Repeated Mining of Multiple Coal Seams

Figure 9

Failure characteristics of roadway floor after mining of each coal seam: (a) 1# coal mining; (b) 3# coal mining; (c) 5-2# coal mining; (d) 5-3# coal mining; (e) 7# coal mining.

(a)

(b)

(c)

(d)

(e)