2Zhai. X. X.. Statistic constitutive equation of top- coal damage for fully mechanized coal face with sub- level caving [J] . Journal of Coal Science and Engi- neering (China), 2008 (1).
3Shen B. , King A. , Guo H.. Displacement stress and seismicity in roadway roofs during mining-induced failure [J] . International Journal of Rock Mechanics and Min- ing Sciences, 2008 (5).