Response characteristics of shale permeability to cyclic loading under different gas pressures.

(3) Both in the loading and unloading stages, under the same number of cycles, as the gas pressure increases, the absolute value of the permeability change in shale shows an increasing trend.

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3 , the permeability of shale samples exhibits a clear trend with variations in deviatoric stress.

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With an increasing number of unloading cycles, the rate of increase in the dimensionless permeability shows a decreasing trend, and the difference between the initial and final dimensionless permeability values also diminishes.

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