Mechanism and Control of Water–Rock Coupling-Induced Disaster when Mining below the Unconsolidated Confined Aquifer

Figure 9

Evolution process of vertical stress and fracture planes of the overlying strata. (a) 250th step. (b) 500th step. (c) 1000th step. (d) 2000th step. (e) 4000th step. (f) 8000th step.

(a)

(b)

(c)

(d)

(e)

(f)