岩石CT断层序列图像裂纹三维重建及其损伤特性的研究

来源期刊：黄金2010年第7期

论文作者：张飞 周海东 姜军周

文章页码：25 - 29

关键词：CT图像； 数字图像处理； Marching Cube算法； 三维重建； 裂纹； 岩石损伤

Key words：CT image； digital image processing； Marching Cube algorithm； three-dimensional reconstruction； crack； rock damage

摘    要：以岩石的CT图像为研究对象,充分利用CT扫描图像资料中的信息,提出了一种CT图像分析方法。利用数字图像增强技术实现CT图像增强,并根据数字图像进行了对比度调整,然后根据数字图像分割技术提取岩石中的空隙和裂隙。在此基础上,利用Marching Cube算法进行连续CT断层图像的三维重建,实现了岩石加载试验中不同阶段的裂纹分布的可视化。此方法不仅可以直观地观察到岩石的损伤演变情况,而且准确地描述了岩石材料内部介质的空间分布,同时结合损伤理论定义了以损伤体积作为损伤因子的损伤变量,得到损伤变量与偏应力间的关系曲线,合理地反映出岩石在损伤偏应力作用下的损伤演化特性。

Abstract: With rock CT image as research object,an analytical method for CT image is proposed.The CT images are strengthened with digital image strengthening technology.The contrast ratio is adjusted based on digital image.And the interstices and cracks in rock are abstracted by digital image segmentation technology.On the basis,the three-dimension continual CT fault image is reconstructed by Marching Cube algorithm.And then the distribution of cracks in different stages of rock loading tests can be visualized.The method can not only directly inspect the development of rock damage,but also truly describe the spacial distribution of rock inner medium.The damage volume is defined as the damage factor of damage variable.And the relationship curve between damage variable and deviator stress is achived.The damage development characters of rock under damage deviator stress can be reasonablly reflected.