Rock is more sensitive to tensile loading than compressive loading, since the tensile strength of rock is much lower than compressive strength. The fracture characteristics of rock in the tensile state are of great significance to the understanding of rock failure mechanisms. To this end, we have conducted numerical simulation researches on mode I cracking process of rock with varying homogeneity, using the Realistic Failure Process Analysis program. With the increase of homogeneity, cracks are concentrating to the ligament area with a decreasing number of crack bifurcations, and the main crack path is becoming smooth. Crack behaviors and mechanical properties are influenced significantly when the homogeneity index is in the range of 1.5 to 5. When the homogeneity index is greater than 30, they are not affected by rock homogeneity and the rock can be considered as essentially homogeneous. It is considered that the global and local strengths are affected by the distribution of rock mechanical properties at mesoscale, which influence the crack behaviors and mechanical characteristics.

岩石对拉伸载荷比压缩载荷更敏感，因为岩石的拉伸强度远低于压缩强度。岩石在拉伸状态下的断裂特性对理解岩石破坏机理具有重要意义。为此，我们使用“现实破坏过程分析”程序对具有不同均质性的岩石的I型开裂过程进行了数值模拟研究。随着同质性的增加，裂纹集中到韧带区域，而裂纹的分叉数减少，主裂纹路径变得平滑。当均质指数在1.5到5范围内时，裂纹行为和机械性能会受到显着影响。当均质指数大于30时，它们不受岩石均质性的影响，可以认为岩石本质上是均质的。认为整体强度和局部强度受岩石力学性能在中尺度上的分布的影响，岩石力学性能的分布影响裂纹行为和力学特性。