Evolution and Deterioration Mechanism of the Mechanical Behavior of Gas-Bearing Coal under Low-Amplitude Cyclic Impact Load.

Before impact, the macropore porosity ranges from 0.66% to 0.92% and increases to 0.98% to 1.68% after impact, with an increase rate of 30.17% to 105.37% and an average of 70.41%. In Figure d, the total porosity of the coal sample shows an increasing trend after impact, with an increase rate of 4.99% to 13.57% and an average increase of 9.31%.

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Influence of impact cycles on mechanical properties of coal Figure shows the variation law of peak strength of coal samples with impact cycles. Generally speaking, as the impact cycles increase, the peak strength of the specimen shows a decreasing trend, satisfying an exponential function relationship.

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