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Advances in Civil Engineering
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2020
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Article
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Fig 4
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Research Article
Deformation Rules for Surrounding Rock in Directional Weakening of End Roofs of Thin Bedrocks and Ultrathick Seams
Figure 4
Similar materials. (a) River sand, (b) gypsum powder, and (c) calcium carbonate powder.
(a)
(b)
(c)