A method of determining the permeability coefficient of coal seam based on the permeability of loaded coal

• Published in: International journal of mining science and technology Vol. 24; no. 5; pp. 637 - 641
• Main Authors: Li, Bo, Wei, Jianping, Wang, Kai, Li, Peng, Wang, Ke
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.09.2014; State Key Lab Cultivation Base, Henan Province Key Lab of Gas Geology&Gas Control, Henan Polytechnic University, Jiaozuo 454003, China%School of Resources&Safety Engineering, China University of Mining&Technology, Beijing 100083, China
• Subjects: Coal seam; Effective pressure; Loaded coal; Permeability coefficient; Pore pressure; 加载; 有效应力; 气体渗透系数; 气体透过系数; 渗透性; 渗透特性; 煤层; 相关性方程; Permeability coefficient; Coal seam; Pore pressure; Effective pressure; Loaded coal
• ISSN: 2095-2686
• DOI: 10.1016/j.ijmst.2014.04.002

This study developed the equipment for thermo-fluid-solid coupling of methane-containing coal, and investigated the seepage character of loaded coal under different working conditions. Regarding the effective pressure as a variable, the variation characteristics of the gas permeability of loaded meth- ane-containing coal has been studied under the conditions of different confining pressures and pore pres- sures. The qualitative and quantitative relationship between effective stress and permeability of loaded methane-containing coal has been established, considering the adsorption of deformation, amount of pore gas compression and temperature variation. The results show that the permeability of coal samples decreases along with the increasing effective stress. Based on the Darcy law, the correlation equation between the effective stress and permeability coefficient of coal seam has been established by combining the permeability coefficient of loaded coal and effective stress. On the basis of experimental data, this equation is used for calculation, and the results are in accordance with the measured gas permeability coefficient of coal seam. in conclusion, this method can be accurate and convenient to determine the gas permeability coefficient of coal seam, and provide evidence for forecasting that of the deep coal seam.