The extensively used modified anisotropic Hoek–Brown (H-B) failure criterion often overestimates the rock strength under a confining pressure (σ₃) exceeding the uniaxial compressive strength (UCS) of rock. In this study, to rectify this problem, the error term (B₁σ₃²) is added to the modified anisotropic H-B strength criterion. The coefficient (B₁) in the error term is determined by introducing the anisotropic parameter (k_α), and the rock critical confining pressure is adopted for the separation of brittle and ductile rock behaviors. The relationship between the anisotropic parameter (k_α) and joint surface dip angle (α) is also established. A new failure criterion that considers rock anisotropy for predicting the rock strength under a high confining pressure (M-HB-HC) is proposed herein. Analyses reveal that the critical coefficient (n) is dependent of the angle (α) and parameter (k_α). The strength predictions for different types of rocks using four failure criteria were compared under four confining pressure conditions. The comparison shows that the M-HB-HC failure criterion has better accuracy than other failure criteria; it can describe the transformation from brittle to ductile behaviors of rock as confining pressures increase. Furthermore, we used discrete element numerical software (3DEC) to conduct nine groups of numerical simulations of triaxial confining pressure tests to verify the accuracy of the criterion. The results of the numerical simulation are in good agreement with the experimental data. The M-HB-HC failure criterion is more suitable for rocks with one set of joint surfaces.

广泛使用的修正各向异性 Hoek-Brown (HB) 破坏准则通常高估了超过岩石单轴抗压强度 (UCS) 的围压 (σ3) 下的岩石_强度。在本研究中，为了纠正这个问题，误差项 ( B ₁ σ ₃ ² ) 被添加到修改后的各向异性 HB 强度准则中。误差项中的系数( B ₁ )通过引入各向异性参数( k _α )来确定，并采用岩石临界围压来区分脆性和韧性岩石行为。各向异性参数 ( k _α) 和联合表面倾角 ( α ) 也成立。本文提出了一种新的考虑岩石各向异性的破坏准则来预测高围压下的岩石强度（M-HB-HC）。分析表明，临界系数 ( n ) 取决于角度 ( α ) 和参数 ( k _α）。在四种围压条件下比较了使用四种破坏准则对不同类型岩石的强度预测。比较表明，M-HB-HC失效准则比其他失效准则具有更好的准确性；它可以描述随着围压的增加，岩石从脆性行为向韧性行为的转变。此外，我们利用离散元数值软件（3DEC）进行了九组三轴围压试验数值模拟，验证了判据的准确性。数值模拟结果与实验数据吻合较好。M-HB-HC 破坏准则更适用于具有一组节理面的岩石。