A case study of gas drainage to low permeability coal seam

作者：Li, Zhang; Hui, Zhang^*; Hao, Guo

来源：International Journal of Mining Science and Technology, 2017, 27(4): 687-692.

DOI：10.1016/j.ijmst.2017.05.014

• Gas drainage
• Low permeability
• Ground drilling holes
• Coupling model
• Abutment stress

Gas drainage at low gas permeability coal seam is a main barrier affecting safety and efficient production in coal mines. Therefore, the research and application of drainage technology at low permeability coal seam is a key factor for gas control of coal mine. In order to improve the drainage effect, this paper establishes a three-dimensional solid-gas-liquid coupling numerical model, and the gas drainage amounts of different schemes are examined inside the overburden material around the goaf. The Yangquan mine area is selected for the case study, and the gas movement regularity and emission characteristics are analyzed in detail, as well as the stress and fissure variation regularity. Also examinations are the released gas movement, enrichment range and movement regularity during coal extraction. Moreover, the gas drainage technology and drainage parameters for the current coal seam are studied. After measuring the gas drainage flow in-situ, it is concluded that the technology can achieve notable drainage results, with gas drainage rate increase by 30%-40% in a low permeability coal seam.

• 出版日期2017-7
• 单位清华大学; 中国矿业大学（北京）