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

Figure 10

Evolution of displacement and stress in coal seam mining for the case where the lower coal seam is excavated with the coal face 5 m from the boundary pillar of the goaf. (a) Nephogram of stope displacement. (b) Vertical stress cloud map of stope.

(a)

(b)