Influence of residual coal pillar from upper protective layer mining on protection effect
In order to study the influence of the coal pillar left in the upper protection layer on the protection effect of the protected layer, the 4 m coal pillar left at the lower side of Ⅵ15-23160 connecting roadway and Ⅵ15-23140, Ⅵ15-23160 and Ⅵ16.17-23140 working faces in Pingmei No. 4 Mine are taken a...
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| Format: | Article |
| Language: | zho |
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Editorial Office of Safety in Coal Mines
2022-02-01
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| Series: | Meikuang Anquan |
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| Online Access: | https://www.mkaqzz.com/cn/article/id/7829 |