Fig. 15 | Scientific Reports

Fig. 15

From: Overburden structure fracture evolution and ground pressure behavior under oblique residual coal pillars in thick seam mining

Fig. 15

Vertical stress nephogram of the surrounding rock when a coal pillar enters the lower stratified face. (a) Before mining the lower slice. (b) When the working face is 45 m from the centre of the section coal pillar. (c) When the working face is below the centre of the section coal pillar. (d) When the working face is 30 m from the centre of section coal pillar.

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