Research Article
The Influence of Heading Rate on Roof Stability in Coal Entry Excavation
Figure 12
Evolution of the mechanical state of the unsupported immediate roof with the increasing advancing distance. (a) Peak value of deflection vs. advancing distance. (b) Peak value of σx vs. advancing distance. (c) Peak value of σy vs. advancing distance. (d) Peak value of τxz vs. advancing distance. (e) Peak value of τyz vs. advancing distance.
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