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Numerical simulation research on dynamical variation of permeability of coal around roadway based on
Due to the change of initial stress state caused by roadway excavation,the permeability of the coal body may be changed ......
针对山西余吾煤矿煤层瓦斯含量高、渗透率低、上隅角瓦斯积聚等特点,为解决N1206回采工作面上隅角瓦斯超限问题,分别从抽采位置、......
