Research Article
The Influence of Heading Rate on Roof Stability in Coal Entry Excavation
Figure 11
The mechanical state of the current unsupported immediate roof (1 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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