The Mathematical Model and Numerical Simulation of High Pressure Air Replacement Coal Seam Gas
The high pressure air replaces seam gas is one of effective methods to prevent coal and gas outburst. The paper studied the seam gas flow theory and mathematical model of multi-physics system which coupled the coal deformation, and also worked out the dynamic Mathematical Model both in the pore system and in the fracture system. The coupled models were implemented in the COMSOL Multi-physics, in which the high pressure air injected process was simulated, and the following conclusions was gained: The injection rate of high pressure air was directly decided by the fracture development, the more a mount of fractures in the coal seams, the higher of the initial coal permeability, and gas transportation in them would be much easier; The gas seepage speed in the fracture system had directionality: The gas seepage speed of fracture system in the horizontal direction is faster than that in the vertical direction; the fracture system plays a more important role in the coal permeability than the role of pore system.
coal matrix multi-physics coupling fracture
LI Hao-ran CHENG Yuan-ping ZHANG Zhi-peng
School of safetv engineering, China Universitv of Mining and Technology, Xu zhou ,221008, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1022-1029
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）