三软厚煤层综放开采工作面窄煤柱合理尺寸研究
徐学锋,李正可,庞龙龙,等
Research on The Reasonable Size of Narrow Coal Pillar in The Three-soft thick Seam of Fully Mechanized Working Face
煤炭工程 . 2016, (9): 64 -67 .  DOI: 10.11799/ce201609019