4ZHANG Chun-hui1, YU Guang-ming2, ZHANG Chun1 1. School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China,2. School of Civil Engineering, Qingdao Technological University, Qingdao 266033, China.Rock matrix-fractured media model for heterogeneous and fractured coal bed[J].中国有色金属学会会刊:英文版,2011,21(S3):621-625.