Advances in Civil Engineering / 2021 / Article / Fig 4

Research Article

Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Figure 4

Stress relief curve at measuring point. (a) 1# measuring point. (b) 2# measuring point. (c) 3# measuring point.
(a)
(b)
(c)

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