Characteristics of coal crack development and gas desorption in the stress affected zone of rock pillar.

2 , it could be seen that with the increase of H , the coal stress shows a decreasing trend, that is, σ x max shows a decreasing trend from the top to the bottom of coal seam.

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With the increase of stress concentration in coal seams, the fracture volume and permeability coefficient show a decreasing trend, while the residual gas content shows an increasing trend.

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