上保护层开采遗留区段煤柱现存状态研究
肖健, 陈学习, 单文选, 毕瑞卿
Research on the existing state of coal pillars in the leftover section of upper protective layer mining
煤炭工程 . 2022, (2): 110 -115 .  DOI: 10.11799/ce202202020