Research Article
The Influence of Heading Rate on Roof Stability in Coal Entry Excavation
Figure 13
The mechanical state of the simulated unsupported immediate roof with the extended advancing distance (1.9 m long and 5 m wide). (a) Distribution of deflection. (b) Distribution of normal stress σx. (c) Distribution of normal stress σy. (d) Distribution of shear stress τxz. (e) Distribution of shear stress τyz.
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