Abstract: Three kinds of strength theory for anisotropic rocks are reviewed: classic Coulomb's shear strength theory,Griffith's crack theory,and empirical theory.Calculation formulas and methods are derived.A comparison of these strength theories is made with the experiments on Casper sandstones and Green River oil shales by the author during his visit to the US.Two minimums in peak strength are present at bedding angle between 0° and 90°.The failure criteria of Hoek-Brown and empirical Mohr-Coulomb are the best ones to predict the peak strength of anisotropic rocks.On account of their complexity,the author presents a new empirical criterion
σ₁=A_1,2β⁴+B_1,2β³+C_1,2β²+D_1,2β+E_1,2
which is simpler and agrees well with experimental data.

摘要： 本文介绍了三类各向异性岩石的强度理论:以哥伦布剪切强度理论为基础的剪切破坏强度理论;以格雷菲斯裂缝理论为基础的拉伸破坏强度理论和以实验为基础的经验公式。推导出它们的计算公式和计算方法。作者根据在美国对卡斯普砂岩和绿河油页岩进行实验的结果,对上述强度理论进行了对比分析,提出了在层面角0°和90°之间峰值强度出现两次极小值的观察结果,证明了荷克-布朗和摩尔-哥伦布这两个经验公式适于顶测试验岩石的峰值强度。但上述公式计算烦杂。作者提出了一个新的经验公式:
σ₁=A_1,2β⁴+B_1,2β³+C_1,2β²+D_1,2β+E_1,2
它与实验结果吻合较好。