Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining

<div>Vertical displacements of different layers of top coal with different thickness in 1.5 m thick medium-strength hard coal gangue. (a) Upper top coal. (b) Lower top coal.</div>

Shock and Vibration

fig9

Figure 9

Figure 9: Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining 