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

Figure 6

Structure and migration characteristics of overburden in strike longwall mining working faces: (a) 1# coal mining; (b) 3# coal mining; (c) 5-2# coal mining; (d) 5-3# coal mining; (e) 7# coal mining.

(a) 1# coal mining

(b) 3# coal mining

(c) 5-2# coal mining

(d) 5-3# coal mining

(e) 7# coal mining