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岩石细观结构控制宏观破裂模式,建立一种表征岩石细观结构的数值模型重构方法并能够嵌入到力学模型中计算岩石破坏过程应力分布,对于揭示岩石破坏机理具有重要的理论意义。本文以花岗岩试件为研究对象,借助于先进的CT技术获取试件内部结构切片图像,利用数字图像处理技术实现了基于CT图像的花岗岩试件结构的识别和表征,基于矢量化方法和岩石破裂过程分析系统RFPA3D建立了花岗岩三维数值试件,对花岗岩试件单轴压缩破裂过程进行了数值模拟。通过数值试验结果与物理实验结果对比发现,基于CT扫描的花岗岩数值试件真实表征了岩石细观结构,所以力学模拟得到的破裂模式与室内物理实验得到的破裂模式相似,同时能够解译岩石破裂力学机理,为深入研究岩石、复合材料等力学特征提供了一种可行方法。
It is of great theoretical significance to reveal the mechanism of rock failure by establishing a numerical model reconstruction method that characterizes the meso-structure of the rock and controlling the stress distribution in the rock failure process by embedding the model into the mechanical model. In this paper, the granite specimen is taken as the research object, the slice of the internal structure of the specimen is obtained by means of the advanced CT technique, the structure of the granite specimen is identified and characterized by using the digital image processing technology, the vectorization method and the rock fracture The process analysis system RFPA3D established a granite three-dimensional numerical specimen to simulate the uniaxial compression failure process of the granite specimen. Comparing the result of the numerical experiment with the physical experiment, it is found that the granite numerical specimen based on CT scanning can truly characterize the rock meso-structure. Therefore, the rupture mode obtained by mechanical simulation is similar to the rupture mode obtained from laboratory physics experiment, meanwhile it can interpret the rock rupture Mechanical mechanism, which provides a feasible method for in-depth study of mechanical characteristics such as rock and composite materials.