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 3

Schematic diagram of movement of overlying strata above the traditional fully mechanized mining face. A: zone affected by support of coal wall; B: bed-separation zone; C: recompacted zone; α represents the angle affected by support; I, II, and III indicate the bending and subsidence zone, the fracture zone, and the caving zone, respectively.