Study on the Mine Pressure Law and the Pressure Frame Mechanism of an Overlying Goaf in a Shallow Coal Seam

<div>Evolution of displacement and stress in coal seam mining for the case where the lower coal seam is excavated with the coal face 20 m from the boundary pillar of the goaf. (a) Nephogram of stope displacement. (b) Vertical stress cloud map of stope.</div>

Shock and Vibration

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Figure 9

Figure 9: Study on the Mine Pressure Law and the Pressure Frame Mechanism of an Overlying Goaf in a Shallow Coal Seam 