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基于X射线的CT扫描技术,因其具有多层位、对同一岩石试件可连续、无损扫描等优点,在岩石力学与工程研究中得到了广泛应用。对岩石单轴压缩破坏过程进行实时CT扫描,也是岩石力学研究的重要内容之一。针对三维显微CT试验系统实时监测煤岩单轴压缩破坏过程中,因位移误差会引起扫描层定位不准确,进而影响试验结果这一基本问题,提出了基于图像检索技术的CT扫描图像处理方法。通过对煤岩试样在单轴载荷作用下破坏过程的CT实时监测,并引入基于Manhattan距离的相似性计算方法,检索出岩石试件同一层位在不同应力状态下的相似扫描层。结果表明,采用图像检索的方法,可以有效地减小煤岩在加载破坏过程中位移误差的影响,更好地通过CT图像来描述煤岩在不同应力状态下的微裂纹分布状况和演化规律,从而在细观层次上揭示岩石在单轴压缩条件下破坏的基本规律。
X-ray CT scanning technology has been widely used in rock mechanics and engineering because of its multi-level position, continuous and non-destructive scanning of the same rock specimen. Real-time CT scanning of uniaxial compression failure of rock is also one of the important contents of rock mechanics research. Aimed at the real-time monitoring of uniaxial compression failure of coal and rock in 3D micro-CT test system, the basic problem that the displacement caused by inaccurate positioning of the scanning layer and thus the test results is brought forward. The CT scanning image processing method based on image retrieval . Through the real-time monitoring of CT during the failure process of coal rock samples under uniaxial load and the similarity calculation method based on Manhattan distance, a similar scanning layer of the same layer of rock specimens at different stress states was retrieved. The results show that the method of image retrieval can effectively reduce the influence of displacement error of coal and rock during loading and unloading, and can better describe the distribution and evolution of microcracks under different stress states by CT images. Which reveals the basic rules of rock failure under uniaxial compression at the meso-level.