【摘要】 地下工程岩体均处于真三轴应力环境下,运用颗粒流离散元程序PFC3D建立了岩石真三轴数值模型,得出一组符合室内试验的细观参数。运用裂纹应变理论对岩石变形破坏特征进行研究,进一步验证了中间主应力效应对岩石破坏演化机制的影响。基于数值模型黏结破坏特征定义了损伤变量,并运用岩石损伤理论建立了真三轴应力状态下的岩石损伤本构模型,揭示了岩石的损伤破坏演化机制。更多还原

【Abstract】 The underground engineering rock mass is under the true triaxial stress environment. A true three-axis numerical model of rock is established by using particle flow discrete element program PFC3 D, and a group of mesoscopic parameters which accords with indoor experiments are obtained.Using the theory of crack strain to study the deformation and failure characteristics of rock, the effect of intermediate principal stress on rock failure evolution is further verified. The damage variables are defined based on the numerical model of the bond failure characteristics. The rock damage constitutive model under true triaxial stress is established by using the rock damage theory, and the damage and evolution mechanism of the rock is revealed.更多还原