Overlying Strata Movement Laws Induced by Longwall Mining of Deep Buried Coal Seam with Superhigh-Water Material Backfilling Technology

Figure 7

Vertical stress distribution characteristics of process stope under different roof management methods. (a) Nonbackfilling excavation 30 m. (b) Nonbackfilling excavation 35 m. (c) Backfilling excavation 35 m. (d) Nonbackfilling excavation 60 m. (e) Nonbackfilling excavation 70 m. (f) Backfilling excavation 70 m.