Shock and Vibration / 2020 / Article / Fig 6

Research Article

Strong Ground Pressure Mechanism and Control at the Longwall Top Coal Caving with a Single Key Stratum in Goaf

Figure 6

Overlying stratum breaking and instability in similar simulations: (a) extraction of the 2-2# coal seam completed; (b) extraction of the 4-2# coal seam at 85 m; (c) extraction of the 4-2# coal seam at 100 m; (d) extraction of the 4-2# coal seam at 130 m; (e) extraction of the 4-2# coal seam at 160 m; (f) completed extraction of the 4-2# coal seam.
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