Open access
Aug 2026
Structural characteristics of double layer hard roof and effects on coal pillar and roadway stability
Summary Underground coal mines require coal pillars to support the overlying strata and protect mining roadways. Excessively wide coal pillars waste recoverable coal resources, whereas overly narrow pillars may induce roadway instability. This challenge becomes more pronounced under composite key strata conditions. A c...
Haolei Li, Chang-You Liu, Huai-cheng Liu et al.
· iScience · 0 citations