Evolution Mechanism of Deformation and Failure of Surrounding Rock during Excavation and Unloading of the High-Stress Rock Mass

<div>Stress–strain curves of sandstone samples. (a) uniaxial stress–strain curves and (b) stress–strain curves of samples with holes plus confining pressure.</div>

Advances in Civil Engineering

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Figure 9

Figure 9: Evolution Mechanism of Deformation and Failure of Surrounding Rock during Excavation and Unloading of the High-Stress Rock Mass 