Mixed-mode cracking is widely encountered in rock-like geomaterials under compression-controlled loadings. Some pending issues still need to be addressed. This work focuses on a new hybrid phase-field fracture method for cracking behavior of anisotropic plastic materials. Several new approaches are introduced. Firstly, a unified decomposition method of elastic strain energy driving crack growth is proposed by combining the advantages of classical spectral and volumetric–deviatoric decomposition algorithms. Then a new damage field evolution criterion is established, allowing to considering a nonlinear interaction between two basic crack propagation modes. The contribution of plastic strain energy to cracking process is investigated by considering an anisotropic yield criterion and combined isotropic-kinematic hardening laws. The validation of the established phase-field model is assessed by a series of representative examples, showing different types of cracking patterns. Sensitivity analysis of some key parameters involved in the model is also carried out to clarify the respective impacts on the progressive cracking patterns. Finally, the effectiveness of the proposed approach is validated by comparison with experimental results.

混合模式开裂广泛存在于压缩控制载荷下的类岩土工材料中。一些悬而未决的问题仍然需要解决。这项工作的重点是一种新的混合相场断裂方法，用于各向异性塑料材料的开裂行为。介绍了几种新方法。首先，结合经典谱和体偏分解算法的优点，提出了一种弹性应变能驱动裂纹扩展的统一分解方法。然后建立了一个新的损伤场演化准则，允许考虑两种基本裂纹扩展模式之间的非线性相互作用。通过考虑各向异性屈服准则和组合的各向同性运动硬化定律，研究了塑性应变能对开裂过程的贡献。已建立的相场模型的验证通过一系列具有代表性的示例进行评估，显示了不同类型的开裂模式。还对模型中涉及的一些关键参数进行了敏感性分析，以阐明各自对渐进式开裂模式的影响。最后通过与实验结果的比较验证了所提方法的有效性。