Permeability distribution characteristics of protected coal seams during unloading of the coal body
作者： Haidong Chen , Yuanping Cheng , Tingxiang Ren , Hongxing Zhou , Qingquan Liu
DOI: 10.1016/J.IJRMMS.2014.03.018
关键词: Drilling 、 Permeability (earth sciences) 、 Geology 、 Stress (mechanics) 、 Overburden pressure 、 Coal 、 Negative exponential 、 Geotechnical engineering 、 Coal mining 、 Axial strain
摘要: Abstract Based on the engineering practices used in mining protective coal seam at Huainan coalfield China, this study investigates temporal evolution of three-dimensional stress protected by numerical simulation. The body should first be loaded and then unloaded with being reduced simultaneously. In accordance forcing process around seam, permeability experiments were performed under fixed axial displacement unloading confining pressure (FADUCP) deviatoric (FDSUCP) paths. During loading stage before point, strain have a negative exponential relationship. However, during after positive Using relationship between strain, along swelling deformation distribution characteristics for was obtained. According to drilling designs gas drainage can optimized. Finally, rationality design verified using data measured seam.
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