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Meyer, J. P.
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document
Intermediate stress effect in reverse
Abstract
<p>Because rock is typically sampled in the form of a right circular cylinder, it is convenient from a laboratory testing perspective to produce failure by the application of an axi-symmetric state of stress called triaxial compression, where the major principal stress σ<sub>I</sub> = σ<sub>a</sub> the axial stress, and the intermediate and minor principal stresses σ<sub>II</sub> = σ<sub>III</sub> = σ<sub>r</sub> the radial stress. For isotropic rock, compression testing σ<sub>I</sub> > σ<sub>II</sub> = σ<sub>III</sub> leads to a conservative estimate of strength parameters, as opposed to triaxial extension, where σ<sub>I</sub> = σ<sub>II</sub> > σ<sub>III</sub>. However, it is shown that even though a rock may exhibit only slight (< 10%) elastic anisotropy, anomalous behavior can occur in strength testing such that a "reverse" intermediate stress effect appears.</p>