Research Article
Constant-Resistance, Rigid, and Flexible Coupling Support Technology for Soft Rock Entrances in Deep Coal Mines:A Case Study in China
Figure 4
S-M scanning results. (a) Medium-grain sandstone (500 times magnification). (b) Medium-grain sandstone (1000 times magnification). (c) Mudstone (2000 times magnification). (d) Sandy mudstone (2000 times magnification). (e) Sandy mudstone (2000 times magnification). (f) Mudstone (3000 times magnification).
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