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Advances in Civil Engineering
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2021
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Article
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Fig 6
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Research Article
Study on the Key Technology of Controlling the Instability of Deep High-Stress Coal and Rock Mass and Relieving the Danger
Figure 6
Peep image (a) before fracturing, (b) after fracturing, and (c) 7 days after fracturing.
(a)
(b)
(c)