Study of the mechanism of enhanced gas extraction by pressure relief and permeability enhancement in protective mining in a coal seam group.

As shown in the figure, under experimental conditions with gas pressures set at 1 MPa, 2 MPa, and 3 MPa, the following observations can be made: When the coal sample is in the pre-peak stage, as the external load continues to increase, the fractures within the coal gradually close, and the permeability exhibits a decreasing trend.

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