The nonlinear energy model and stress-strain model of sandstone.

The total energy of confining pressure 30 MPa has a clear trend of decreasing first and then increasing after the peak.

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After the elastic strain stage, although the elastic energy curve continues to increase, the dissipation energy curve also begins to show an increasing trend.

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At this time, the dissipated energy of the rock starts to deviate from the strain axis and has an obvious trend of increasing.

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