Anisotropic Failure Strength of Shale with Increasing Confinement: Behaviors, Factors and Mechanism.

According to Figure 1 b, the anisotropic strength ratio S A 1 decreases with the increasing confinement; however, the anisotropic strength difference S A 2 shows an increasing trend.

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At the meantime, the parameters k 2 and f also present a decreasing trend like the parameter S A 1 , because they are all defined from the perspective of strength ratio.

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