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单轴压缩条件下花岗岩中不同细观组分的运动过程对花岗岩变形破坏过程分析具有重要意义,可以使用视频图像处理技术进行研究。根据花岗岩试件室内常规单轴压缩试验时摄取的试验视频,在提取单帧图像、进行灰度化和二值化处理基础上,得到试样中石英、长石、黑云母的实际分布,用Fourier变换指数评价这些细观组分的形状特征及其随时间的变化过程,使用粒子图像测速技术得到不同时刻、不同细观组分的位移情况,研究细观组分的运动方向、破坏顺序及其与岩石变形破坏过程的关系。结果表明,Fourier变换指数可以用于定量评价花岗岩细观组分的形状特征和细观组分形状的改变过程;在单轴受压过程中,不同细观组分发生明显变形的先后顺序是黑云母、长石、石英;细观组分的运动方向主要是垂直于加荷方向。本文研究成果对于分析岩石变形破坏机理具有一定的参考价值。
The movement of different mesoscale components in granite under uniaxial compression is of great significance for the analysis of deformation and failure process of granite, which can be studied by using video image processing technology. According to the test video taken from the conventional uniaxial compression tests of granite specimens in laboratory, the actual distribution of quartz, feldspar and biotite in the sample is obtained by extracting the single frame image, graying and binarizing, Fourier transform index to evaluate the shape and characteristics of these mesostructures and their changing process with time. By using the particle image velocimetry, we can get the displacement of different mesostructures at different times and in different directions. Its relationship with the process of rock deformation and destruction. The results show that the Fourier transform index can be used to quantitatively evaluate the change of the shape and the shape of the mesostructures in granite. In the uniaxial compression process, the order of obvious deformation of the different mesostructures is black Mica, feldspar, quartz; the direction of movement of the meso-component is mainly perpendicular to the loading direction. The results of this paper have certain reference value for analyzing the mechanism of rock deformation and failure.