Hydro-mechanical coupling of granite with micro-defects: Insights into underground energy storage

Hydro-mechanical coupling of granite with micro-defects: Insights into underground energy storage

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In order to revel the hydro-mechanical coupling characteristics of granite at various pore pressures and confining pressures.The spatial micro-pore structure before and after the failure click here of granite is extracted by high-precision CT scanning system.The results show that the UCS of the damaged granite decreases with the increase of pore pressure under certain confining pressure.The sensitivity of UCS of granite to the change of pore pressure is lower than that of confining pressure.In the rock compaction stage, the permeability decreases slightly, while it increases slowly in the elastic and plastic stages.

From the perspective of microscopic fracture structure, the number of roar channels increased by 134 times, the total length increased by nearly 100 times, the average equivalent radius was expanded to 1.64 times, and the permeability increased by 443 airpods in jacksonville times before and after rock failure.The permeability characteristics of granite are most affected by pore-throat structure.