松软顶板采场煤壁片帮与顶板冒落作用机理研究
张艳伟,王方田,宋〓启,等
Study on the Action Mechanism of rip falling and roof caving around coal face under the loose roof
煤炭工程 . 2016, (4): 78 -81 .  DOI: 10.11799/ce201604024