The Experiments of Coalbed Methane Penetration Law in Zhaogu Mine

Set the raw coal samples of zhaogu mine in Jiaozuo as the object of study, with a self-developed equipment for thermo-fluid-solid-stress coupling of coal containing methane, analyse the relationship between permeability of raw coal samples and the change of effective stress, resultant stress strain process of raw coal samples. Experimental results show that The permeability of coal samples have stress sensitivity, permeability represents nonlinear decreasing relationship with effective stress increasing, Possess the law of negative exponent,This is consistent with the results of previous studies. During the full stress-strain process, strain increases with the stress increasing, penetration rate changed with the strain of the coal sample Increase after reducing ,on compaction stage stage and elastic deformation stage, transfusion decreased with stress increased , on yield deformation stage, permeability of coal samples reached minimum and began to overtake, on brittle break stage and residual strength stage, permeability increased by a large margin, mainly due to the coal macroscopic fissures.