Research on Structural Stability of basic Roof trapezoidal Block in the terminal line period of extra-thick coal with fully mechanized mining

Research on Structural Stability of basic Roof trapezoidal Block in the terminal line period of extra-thick coal with fully mechanized mining Journal of Mining and Safety Engineering . 2022, (3): 489 -498 . DOI: 10.13545 /j.cnki.jmse.2021.0168