Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams

<div>Stress distribution of the roof of N0381 retracement channel. (a) Vertical stress of different heights. (b) Horizontal stress of different heights.</div>

Shock and Vibration

fig14

Figure 14

Figure 14: Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams 