Analysis on Subsidence Law of Bedrock and Ultrathick Loose Layer Caused by Coal Mining

Figure 7

The bedrock movement under ultrathick loose layer: (a) excavation of 40 cm; (b) excavation of 60 cm; (c) excavation of 80 cm; (d) excavation of 100 cm; (e) excavation of 120 cm; (f) excavation of 140 cm; (g) excavation of 200 cm; (h) excavation of 220 cm.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)