Advances in Civil Engineering / 2021 / Article / Fig 3

Research Article

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

Figure 3

Schematic diagram of ground stress measuring point layout. (a) Point 1. (b) Point 2. (c) Point 3.
(a)
(b)
(c)

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