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天然岩石材料内部存在各种缺陷,在微、细观尺度表现出高度的非均质特性。基于连续介质力学框架,采用非线性标量损伤本构关系描述岩石材料的变形与破坏行为,建立了岩石细观损伤本构模型,并在常规Weibull随机分布模型基础上,引入空间相关尺度因子以模拟实际岩石材料各项物理力学指标具有的空间相关特征。选取典型岩石单轴拉伸试验算例,分析随机场内空间相关尺度因子的变化对试样荷载-加口张开度关系曲线以及破坏行为的影响。结果表明,考虑岩石材料各项物理力学指标的空间相关尺度特征对评价其力学指标的离散性以及破坏形态特征有着较显著的影响。
There are various kinds of defects in the natural rock material, which show high heterogeneity in micro and mesoscopic scale. Based on the continuum mechanics framework, the nonlinear scalar damage constitutive relation is used to describe the deformation and failure behavior of rock materials. A meso-damage constitutive model of rock is established. Based on the conventional Weibull stochastic distribution model, the spatial correlation scale factor is introduced to simulate The actual rock material physical and mechanical indicators have the spatial correlation characteristics. A typical example of rock uniaxial tensile test is selected to analyze the influence of the change of space-related scale factor on the load-opening relation curve and the failure behavior of the specimen. The results show that considering the spatial-scale features of various physical and mechanical indexes of rock materials has a significant impact on the evaluation of the discreteness of mechanical indexes and the damage of morphological characteristics.