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Two distinct modes of compressive failure in rocks

机译：岩石中两种不同的压缩破坏模式

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We compare compressive failure in crystalline rocks with that in a newly tested hornfels from the Long Valley Exploratory Well, California. Strength characteristics, deformation behavior, and microme-chanics of failure observed in the nearly isotropic, very-fine-grained hornfels are drastically different from those encountered in previously tested crystalline rocks. The variation of the major principal stress with the volumetric strain is linear up to the point of failure, suggesting a complete lack of dilatancy. This was corroborated by SEM analysis showing a complete lack of microcracking prior to failure, contrary to observations in crystalline rocks. Consequently, no significant effect of the intermediate principal stress on the hornfels true triaxial strength was detected. This too is surprisingly different from previously tested rocks.
机译：我们将晶体岩石的压缩破坏与来自加利福尼亚州长谷探索井的新测试的角岩进行了比较。在几乎各向同性的非常细的角f中观察到的强度特性，变形行为和破坏的微观机制与先前测试的晶体岩石中所遇到的那些完全不同。主要主应力随体积应变的变化线性变化，直至达到破坏点，表明完全没有膨胀。 SEM分析证实了这一点，显示出在破坏之前完全没有微裂纹，这与在晶体岩石中的观察结果相反。因此，没有检测到中间主应力对角f真三轴强度的显着影响。这也与先前测试的岩石出奇地不同。

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