Movement Laws of Overlying Strata above a Fully Mechanized Coal Mining Face Backfilled with Gangue: A Case Study in Jiulishan Coal Mine in Henan Province, China

Figure 1

Problems caused by surface subsidence and surface cracks. (a) Surface subsidence in Australia; (b) landslide in Australia; (c) damage to farmland in India; (d) damage to roads in China.

(a)

(b)

(c)

(d)

(e)