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

<div>Relative displacement curve of roadway roof and floor at different pillar widths. (a) Vertical displacement curve. (b) Horizontal displacement curve of two sides.</div>

Advances in Civil Engineering

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Figure 15

Figure 15: Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal 