Study on the mechanical properties of unloading damaged sandstone under cyclic loading and unloading.

In the single test, the elastic modulus showed a trend of first increasing and then decreasing with the increased number of cycles, which indicated that the development of internal cracks in the specimen could be suppressed at the beginning of the cycle.

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The dissipated energy density during cyclic loading and unloading is significantly smaller than that during unloading, and shows a decreasing trend at the early stage of cycling, which indicates that the cyclic action at the early stage is beneficial to crack closure.

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