Study on the mechanical response characteristics of sandstone under elasticity plasticity and full path unloading after peak stress.

As the normalized plastic shear strain increases, the dilation angle ( ψ ) exhibits an overall trend of rapid growth followed by stable variation.

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Both elastic and plastic states show an increasing trend in Poisson’s ratio ( μ ).

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When the plastic stress is horizontally unloaded, the curve shows a decreasing trend, but the deformation modulus E of the confining stress path under constant plastic D 1 displacement remains basically unchanged before the fracture, and gradually decreases near the fracture.

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