Research Article
Gob-Side Entry Retaining Technology with Advanced Empty Hole Butterfly-Shaped Weakening in Three-Soft Coal Seam in China
Figure 16
Plastic zone distribution with different pore diameters: (a) L = 0.3 m; (b) L = 0.4 m; (c) L = 0.5 m; (d) L = 0.6 m.
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(b) |
(c) |
(d) |