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Advances in Civil Engineering
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2021
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Article
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Fig 11
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Research Article
Study on Dynamic Evolution of Roof Crack and Support Timing of Secondary Tunneling for Large Section Open-Off Cut in Deep Mines
Figure 11
Plan view of three roof support schemes, (a) Scheme 1; (b) Scheme 2; (c) Scheme 3.
(a)
(b)
(c)