Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation University of Science and Technology 266590;
College of Civil Engineering University of Technology 350118 c;
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology University of Science and Technology 266590;
Gas flow; Apparent permeability; Water film; ADSORPTION; Non-equilibrium state;