Abstract The strength of stratified rocks is closely related to their inherent structural anisotropy, which cannot be accurately represented by the isotropic failure criteria. In this study, the Pietruszczak-Mroz (PM) anisotropic failure criterion was used to describe the directional dependency of strength of stratified rocks. In the meridian plane, the frictional coefficient was established by incorporating an anisotropic variable defined as a joint invariant of fabric and stress tensors. In the deviatoric plane, the anisotropic failure surface was characterized by a smooth shape function of Lode's angle. The material parameters for the failure criterion can be determined using the triaxial test. The PM anisotropic criterion was utilized to predict the anisotropic strength of specific stratified rocks. Analysis of the experimental data validated the assertion that PM anisotropic criterion has excellent ability to model the anisotropic strength features of stratified rocks.

中文翻译：

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使用 Pietruszczak-Mroz 各向异性破坏准则模拟分层岩石的强度

摘要 层状岩体的强度与其固有的构造各向异性密切相关，各向同性破坏准则无法准确表示。在本研究中，Pietruszczak-Mroz (PM) 各向异性破坏准则用于描述分层岩石强度的方向依赖性。在子午面，摩擦系数是通过结合定义为织物和应力张量的联合不变量的各向异性变量来建立的。在偏平面中，各向异性破坏面的特征是 Lode 角的平滑形状函数。失效准则的材料参数可以使用三轴试验确定。PM各向异性准则用于预测特定层状岩石的各向异性强度。