Stress-Pore-Permeation Characteristics of Coal Specimens with Different Strengths Based on Acoustic Emission Fractals.

It could be seen that the permeability showed a trend of a rapid decrease, slow decrease, slow increase, and rapid increase with the decrease of acoustic emission fractal dimension.

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Obviously, as the specimen strength increased, both the peak ringing counts and the subpeak ringing counts showed an increasing trend.

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The reduction range of the permeability showed a decreasing trend with the increase in the specimen strength.

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