软硬复合煤层瓦斯抽采穿层钻孔变形塌孔特征规律研究
张栋, 任朝朋
Research on Characteristics of Borehole Deformation and Hole Collapse in Typical Soft and Hard Compound Coal Seam
煤炭工程 . 2024, (10): 201 -207 .  DOI: 10.11799/ce202410024